WO2016095766A1 - 一种补口机具及施工方法和新型补口结构 - Google Patents

一种补口机具及施工方法和新型补口结构 Download PDF

Info

Publication number
WO2016095766A1
WO2016095766A1 PCT/CN2015/097217 CN2015097217W WO2016095766A1 WO 2016095766 A1 WO2016095766 A1 WO 2016095766A1 CN 2015097217 W CN2015097217 W CN 2015097217W WO 2016095766 A1 WO2016095766 A1 WO 2016095766A1
Authority
WO
WIPO (PCT)
Prior art keywords
steel
electric heating
patch
sheet
pipeline
Prior art date
Application number
PCT/CN2015/097217
Other languages
English (en)
French (fr)
Inventor
郑明嘉
陈锬
雷小均
苏俊业
胡兵
周浩
何浏炜
李建中
郭美福
杨智勇
杨志骅
Original Assignee
四川金发科技发展有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201410785138.7A external-priority patent/CN104500920A/zh
Priority claimed from CN201410784731.XA external-priority patent/CN104500919A/zh
Application filed by 四川金发科技发展有限公司 filed Critical 四川金发科技发展有限公司
Publication of WO2016095766A1 publication Critical patent/WO2016095766A1/zh

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/10—Coatings characterised by the materials used by rubber or plastics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings

Definitions

  • the invention belongs to the technical field of gas transmission and oil pipeline construction, and particularly relates to a repairing machine and a construction method and a novel supplementary structure.
  • the steel pipeline used in the construction of oil and gas pipelines must be pre-treated with anti-corrosion treatment.
  • the 3LPE and 3LPP anti-corrosion coatings are commonly used anti-corrosion structures in pipeline anti-corrosion.
  • the welding joints are usually reserved, generally having a width of 100-150 mm, and the butt-joint steel pipes are welded to each other at the reserved welded joints, and the pre-prepared anti-corrosion layers at both ends are wrapped on the butt-joint steel pipes.
  • the corrosion protection of the welded joints of steel pipes is completed at the construction site.
  • the pipe filling technology used has a significant impact on the overall corrosion protection effect of the pipeline, because it is related to the final anti-corrosion quality of the entire pipeline.
  • 3LPE, 3LPP anti-corrosion pipeline anti-corrosion pipe anti-corrosion generally adopts heat shrink sleeve (belt) patching technology.
  • the construction method of this technology is: after the processing of the repairing substrate, the epoxy primer is applied, and the primer is dry and coated. Cover shrink sleeve (belt), bake heat shrink sleeve (belt) to shrink, and melt the hot melt adhesive on the heat shrink sleeve to stop heating after reaching a suitable level. After the heat shrink sleeve is naturally cooled, it is fixed at the joint. .
  • This conventional heat shrink sleeve repair technique has the following disadvantages in use:
  • the heat shrink sleeve (belt) is generally baked by flame with a manual hand-held grill, and temperature accuracy and uniformity are difficult to accurately control.
  • the low temperature can not guarantee the bonding effect, and the local overheating tends to cause carbonization of the heat shrinkable sleeve (belt).
  • the heating is uneven, the shrinkage is inconsistent, resulting in bubbles and wrinkles, and the quality of the mouth is difficult to ensure.
  • the hot-melt adhesive used in the heat shrinkable sleeve has strong polarity, low molecular weight, poor compatibility with PE or PP on the surface of the anti-corrosion layer at both ends, and the elastic shrinkage force of the cross-linked polyethylene substrate is not strong when heated.
  • the pressure applied to the hot melt adhesive is limited, and the hot melt adhesive and the anticorrosive layer at both ends cannot form a reliable bond, and the debonding cracking phenomenon is likely to occur after the buried, resulting in failure of the joint.
  • Radiation cross-linked polyethylene heat shrinkable tape (set) must be obtained through multiple processes such as extrusion molding, radiation crosslinking, expansion, cooling, and gluing. The cost is extremely high, and it cannot be recycled by thermoplastics. Caused certain damage.
  • Another object of the present invention is to provide a construction method of the above-described mouthpiece.
  • a further object of the present invention is to provide a novel repairing structure with novel structure and good anti-corrosion effect prepared by using the above-mentioned patching machine and construction method.
  • a mouth-binding machine which is a metal inner liner, an electric heating device and a steel hoop from the inside to the outside, the metal inner liner is formed into a cylindrical shape, and the head and the tail are partially overlapped; the electric heating device is wrapped outside the metal inner liner The steel hoop is wrapped in a cylindrical shape outside the electric heating device, and the end of the steel hoop is locked by a mechanical locking device.
  • the length of the metal inner liner is 20 to 120 mm longer than the prefabricated anticorrosive layer at both ends, and the width is 20 to 240 mm wider than the patch sheet, and the thickness is 0.2 to 1.0 mm.
  • the ends of the metal lining plate can be pre-formed into a circular arc shape, and the radius of the arc is the same as the radius of the steel pipe, and the arcs at both ends are each 30° to 60°.
  • the metal lining material is selected from one or more of stainless steel, galvanized steel, tin-plated steel, aluminized steel, nickel-plated steel, chrome-plated steel, pure aluminum, aluminum alloy, pure copper or copper alloy, and metal lining.
  • the side of the plate patch can be textured to achieve an anchor depth of 5 to 50 ⁇ m.
  • the electric heating device may be a heating coil or a heating sheet, preferably an electric heating coil.
  • the electric heating circle is composed of two semicircular electric heating coils, and the semicircular electric heating coils can be completely independent, and one end can be connected by a hinge.
  • the total length of the electric heating ring is 5 ⁇ 50mm shorter than the circumference of the prefabricated anti-corrosion layer at both ends, ensuring that the head-to-tail overlap does not occur during the joint construction; the width is 0-220mm wider than the patch, but 20-100mm narrower than the metal liner.
  • the thickness of the electric heating ring is 3-20 mm, and the thickness of the hinge connecting the two semicircular electric heating rings should be less than or equal to the thickness of the electric heating ring. The construction does not affect the close fit of the electric heating ring and the metal inner liner and the steel hoop.
  • the inner circle of one of the electric heating coils extends from a length of 30 to 80 mm and a thickness of 0.5 to 1.0 mm, and extends between another electric heating ring and the metal inner lining plate during installation.
  • the pressure can be better transmitted to prevent the metal liner from being convexly deformed at the joint.
  • the electric heating coil can be a stainless steel mica heating ring, a cast aluminum heating ring, a cast copper heating ring and a stainless steel ceramic heating ring, and the inner and outer surfaces thereof are smooth and smooth.
  • the terminal is outside the cylindrical surface of the heating coil main body, so as not to affect the close contact between the electric heating ring and the metal inner liner and the steel hoop.
  • the power supply is 220V or 380V common power frequency AC.
  • the steel hoop material is carbon steel, alloy steel or stainless steel.
  • the thickness of the ferrule is 0.5-1.5mm, the width is the same as that of the electric heating ring, and the effective length is 10 ⁇ 50mm shorter than the outer circumference of the electric heating ring. There is no overlap between the head and the tail during the joint construction.
  • the steel hoop head and tail are locked by a mechanical locking device including a thread locking mechanism, an eccentric locking mechanism, a bevel locking mechanism, a four-bar locking mechanism, etc., preferably using a thread locking mechanism.
  • a mechanical locking device including a thread locking mechanism, an eccentric locking mechanism, a bevel locking mechanism, a four-bar locking mechanism, etc.
  • the thread locking mechanism When the thread locking mechanism is used, the end of the steel hoop is wrapped around a connecting rod, and the connecting rod can be freely rotated around the shaft to facilitate the locking of the hexagon socket bolt.
  • the number of bolts is 3 to 9 and is evenly distributed in the width direction of the steel hoop.
  • the hexagon socket head bolt specifications and tightening torque should be determined based on the number of bolts selected, the thread surface condition, lubrication, and related design specifications.
  • the locking force may become smaller after the softening of the patch in the construction.
  • a spring washer or spring may be used.
  • a construction method of the above-mentioned mouth-filling machine comprises at least the following steps:
  • Preheating of steel pipe preheating the steel pipe at the pipe joint to 30 ⁇ 80 °C;
  • Patch of the patch Wrap the patch on the surface of the epoxy primer;
  • the electric heating device is wrapped outside the metal inner lining plate, and a temperature sensor is placed between the two;
  • Program temperature control turn on the power, the first stage temperature controller set value is adjusted to 50 ⁇ 100 ° C, keep 0 ⁇ 30min., let the epoxy primer dry; second stage temperature controller set value up To 180 ⁇ 280 ° C, keep 10 ⁇ 60min.; cut off the heating power, slowly cooled to below 50 ° C;
  • Remove the implement Loosen the mechanical locking device and remove the steel hoop and electric heating device in sequence.
  • the surface quality of the steel pipe should reach Sa2.5 level, and the surface of the steel pipe is cleaned with compressed air immediately after sandblasting and rust removal.
  • a plurality of existing methods such as electric heating ring heating, electromagnetic induction heating, infrared heating, liquefied gas flame heating, etc., can be used to preheat the steel pipe of the pipe joint portion to 30 to 80 ° C (using The calibrated infrared thermometer monitors the temperature, and the preheating temperature can be appropriately increased when the outside temperature is low.
  • One of the purposes of heating is to remove the moisture adsorbed on the steel pipe, and the other is to facilitate the rapid drying of the epoxy primer.
  • the epoxy primer is brushed along the circumference of the pipe or sprayed using a spraying device to avoid air bubbles, and the epoxy primer is evenly coated on the mouth.
  • the entire surface of the steel pipe If the temperature of the epoxy primer is too low, the coating may be inconvenient, and the epoxy primer may be appropriately heated.
  • the patch sheet is wrapped immediately after the epoxy primer is applied, so that the epoxy primer can be prevented from being subjected to the process of drying the surface. Pollution.
  • the invention replaces the existing heat shrinkable sleeve (belt) with a patch sheet.
  • the material of the patch sheet is a blend of maleic anhydride grafted polyethylene copolymer and polyethylene, and the blend thereof is blended. The ratio is from 1:0 to 1:10, and the overall graft ratio is preferably 0.1% by weight or more.
  • the material of the patch is a blend of maleic anhydride grafted polypropylene copolymer and polypropylene, the blending ratio is 1:0 to 1:10, and the overall grafting rate is 0.1wt. More than % is appropriate.
  • the groove can close the steel pipe when the patch is wrapped, and the metal liner plate is always close to the patch sheet to improve the quality of the mouth.
  • the length of the flat portion in the width direction of the patch is the same as the minimum length of the bare steel tube at the welded joint, and the ends of the straight portion are uniform thinned regions, and the width of each end is preferably 50-100 mm.
  • the length of the patch (in the circumferential direction of the pipe) is as short as 60 mm smaller than the circumference of the pipe, and the longest is 100 mm longer than the pipe circumference.
  • the ends of the straight portion are also uniformly thinned, and the length of each end is 30 ⁇ . 60mm is suitable.
  • the uniform thinning zone can make the patch and the prefabricated anti-corrosion layer at both ends and the self-bonding smooth, which is beneficial to the metal inner liner to always adhere to the patch sheet and improve the quality of the mouth.
  • the patch can be customized according to the length of the exposed steel pipe on both sides of the bead, so that the length of the straight portion on both sides of the groove of the patch is corresponding to it.
  • the thickness of the flat portion of the patch should be slightly larger than the thickness of the anti-corrosion layer at both ends, and it is suitable to achieve 100-150% of the thickness of the anti-corrosion layer at both ends.
  • the patch When the patch is wrapped, it can be tightened with a tight rope device, etc., and then fixed with a fixing piece or a sticker, or it can be fixed by soldering iron.
  • the wrapped metal inner liner can be temporarily fixed by using a dry tape, and after the electric heating ring is wrapped, the position of the electric heating ring is moved left and right to tear off the adhesive.
  • Metal liner after construction is completed It will be firmly bonded to the patch and become a whole.
  • the metal inner liner is wrapped in a cylindrical shape, the head and the tail are partially overlapped, and in order to integrally bond the overlapping portions, the outer surface of the metal inner liner is adhered with an adhesive film in advance, and has a thickness of 0.05 to 0.2 mm.
  • One side of the film is flush with the end of the metal liner, and the other three sides are 5 to 20 mm narrower than the overlap area, in order to prevent the adhesive from overflowing and sticking to the electric heating ring when heated.
  • the adhesive film is made of a blend of maleic anhydride grafted polyethylene/polypropylene copolymer and polyethylene/polypropylene.
  • the blending ratio is 1:0 to 1:10, and the overall grafting ratio is 0.1wt% or more. It is appropriate.
  • a slim temperature sensor should be selected, and the temperature measurement point of the sensor should be placed in an inner region at least 50 mm from the edge of the electric heating circle.
  • the hexagonal bolt can be quickly tightened with a power tool, and finally tightened to a prescribed torque with a force wrench.
  • the hexagon socket bolt should be greased.
  • the metal inner liner is also tightened accordingly, and a tight fit between the filler sheet and the metal inner liner and between the layers of the patching implement is achieved.
  • the locking force of the patch sheet may be reduced after being softened in the second stage, and may be retightened with a force wrench every 1 to 5 minutes, and the torque should be 30% of the specified initial torque during tightening. ⁇ 90%.
  • the patch sheet In the case where the patch sheet is not required to be bonded to the metal liner, the patch sheet should have a two-layer structure, that is, a layer of polyethylene/polypropylene is additionally coated on the outer layer of the above-mentioned patch sheet, and the thickness is 0.1. ⁇ 0.5mm can be.
  • a novel filling structure comprises a butt steel pipe, a prefabricated anti-corrosion layer at both ends, and a filling portion, wherein an outer layer of the steel pipe is provided with an epoxy primer layer, and the outer periphery of the epoxy primer layer is wrapped
  • the thermoplastic filler sheet is covered with an epoxy primer layer and is overlapped with the pre-prepared anti-corrosion layer at both ends, and a metal metal inner liner is arranged around the outer periphery of the thermoplastic patch sheet, adjacent to each other. The layers are firmly bonded to form a whole.
  • the surface of the steel pipe at the joint is rough, and the anchor depth reaches 10 to 100 ⁇ m.
  • the epoxy primer layer is formed by curing a solventless liquid epoxy coating or an epoxy powder coating having a thickness greater than 50 ⁇ m.
  • thermoplastic filler sheet is completely melted integrally with the prefabricated anti-corrosion layer at both ends and the self-lap joint.
  • the thickness of the thermoplastic filler sheet body is 100-150% of the thickness of the straight tube anti-corrosion layer, and the width is longer than the minimum length of the steel pipe at the filling portion. 100 to 200 mm.
  • the annular bead at the butt joint of the steel pipe is embedded in the thermoplastic filler sheet and does not protrude outward.
  • the metal inner liner is wrapped in a cylindrical shape outside the thermoplastic patch sheet, and has a overlap of 20-120 mm at the head and tail, and the width is wider than the thermoplastic filler.
  • the sheet has a width of 20 to 240 mm and a thickness of 0.2 to 1.0 mm.
  • the overlapping portion of the metal liner plate head and tail is integrally bonded by an adhesive film previously adhered to the outer surface of the inner metal plate.
  • the thickness of the adhesive film is 0.05-0.2mm.
  • the material is a mixture of grafted polyethylene/polypropylene copolymer and polyethylene/polypropylene.
  • the blending ratio is 1:0 ⁇ 1:7, and the overall grafting ratio is 0.15wt% or more.
  • the grafted polyethylene/polypropylene copolymer refers to a graft copolymer of maleic anhydride, acrylic acid, methacrylic acid, itaconic acid or glycidyl ester with polyethylene/polypropylene.
  • the thermoplastic filler sheet is made of a mixture of a grafted polyethylene/polypropylene copolymer and a polyethylene/polypropylene in a blending ratio of 1:0 to 1:7, and an overall graft ratio of 0.15 wt% or more;
  • the grafted polyethylene/polypropylene copolymer refers to a graft copolymer of maleic anhydride, acrylic acid, methacrylic acid, itaconic acid or glycidyl ester with polyethylene/polypropylene.
  • the material of the metal liner is selected from one or more of stainless steel, galvanized steel, tin-plated steel, aluminized steel, nickel-plated steel, chrome-plated steel, pure aluminum, aluminum alloy, pure copper or copper alloy.
  • the invention has the following advantages:
  • the metal inner lining board has strong anti-rust ability and is firmly bonded with the patch sheet, which greatly improves the barrier property of the patch layer to visible light, ultraviolet light, water, oxygen and water vapor, and mechanical damage to sharp objects.
  • the resistance has also been strengthened, and the life of the mouth layer has been greatly improved.
  • the invention adopts the steel hoop to lock and press, can exert great pressure on the patch sheet during the softening and bonding process, and greatly improve the bonding strength to the epoxy layer; the peel strength of 23° C. can reach 250 N/cm or more. The peel strength at 50 ° C reaches 100 N / cm or more, which is twice and 5 times higher than the shrinkage of the heat shrink sleeve (belt);
  • the joint structure is similar to that of the straight tube 3LPE and 3LPP anti-corrosion layer, and the patch sheet itself is thermoplastic, and can be completely melted together with the pre-fabricated anti-corrosion layer at both ends and the joint of the patch sheet itself. , the sealing effect is excellent;
  • the mouth-fixing machine of the invention provides stable and controllable temperature and pressure conditions for the physical and chemical conversion of the epoxy primer and the patch sheet, and has good construction quality and high quality stability;
  • the mouth-fixing machine of the invention is simple and reliable, has low cost and low construction cost;
  • the patch of the invention does not need radiation crosslinking, the cost is low, the scrap can be recycled, and no pollution
  • Figure 1 is a schematic view showing the mouthpiece of the present invention in an operating state
  • FIG. 2 is a schematic view showing the structure of the mouth of the present invention.
  • a 3LPP pipe of ⁇ 610, prefabricated anti-corrosion layer thickness 3mm, patch piece 5 width 400mm, thickness 3.3mm, repairing machine and construction method are as follows:
  • the fitting device is a metal inner liner 4, an electric heating device 3 and a steel hoop 1 from the inside to the outside.
  • the metal inner liner 4 is wrapped in a cylindrical shape outside the patch sheet 5, and the head and tail portions are partially overlapped.
  • the metal inner liner 4 has a length of 2000 mm, a width of 500 mm, and a thickness of 0.3 mm, and is made of 304-1/2H stainless steel cold-rolled sheet.
  • the metal inner lining plate 4 has a circular arc shape at both ends of the head and tail, and the arc radius is 305 mm, and the arc at both ends is 35°.
  • the electric heating device 3 is an electric heating coil, which is composed of two semicircular electric heating coils, and one end of the semicircular electric heating coil is connected by a hinge.
  • the total length of the electric heating ring is 1920 mm, the width is 450 mm, and the thickness is 5 mm.
  • the total power of the electric heating coil is 18kW, and the power of the semicircular electric heating coil is half of the total power.
  • the electric heating ring is a stainless steel mica heating ring, and the inner and outer surfaces are smooth and smooth.
  • the power supply is 220V or 380V common power frequency AC.
  • the steel hoop 1 is wrapped in a cylindrical shape outside the electric heating ring, and the inner surface is smooth and smooth, and the material is 304-1/2H stainless steel cold-rolled plate.
  • the ferrule 1 has a thickness of 0.5 mm, the same width as the electric heating ring, and a length of 1945 mm.
  • the end of the ferrule 1 is locked by the thread locking mechanism 2, and the number of the bolts is five, evenly distributed in the width direction of the steel ferrule 1.
  • the thread performance grade is 6.8, the surface is oxidized, coated with molybdenum grease, nominal diameter M8, and each bolt is equipped with a spring washer.
  • the total locking force is 3500kgf, each hexagon socket bolt has a locking force of 700kgf and a tightening torque of 12Nm.
  • the construction method includes the following steps:
  • Preheating of steel pipe preheating the steel pipe at the pipe joint to 65 °C;
  • Patch 5 Wrap the patch 5 on the surface of the epoxy primer.
  • the patch 5 is made of a 4:1 blend of polypropylene and maleic anhydride grafted polypropylene copolymer.
  • the length of the part is the same as the minimum length of the bare steel pipe at the weld, and the ends of the straight part are uniformly thinned, each end has a width of 80mm; the length of the straight part of the length of the patch 5 (in the circumferential direction of the pipe) is larger than that of the pipe.
  • the circumference is 50mm, and both ends of the straight portion are also uniform thinning zones, each end having a length of 50mm;
  • wrapped metal inner liner 4 the metal inner liner 4 is wrapped on the patch sheet 5, the outer surface of the metal inner liner 4 is pre-adhered with an adhesive film having a thickness of 0.1 mm; one side of the film and the metal inner liner The ends are flush, the remaining three sides are 10 mm narrower than the overlapping area; the adhesive film is made of a 4:1 blend of polypropylene and maleic anhydride grafted polypropylene copolymer;
  • wrapping electric heating device 3 wrapping the electric heating device 3 outside the metal inner liner 4, and placing a temperature sensor therebetween, the temperature measuring point of the sensor should be placed at an inner region of at least 50 mm from the edge of the electric heating device 3;
  • Program temperature control turn on the power, the first stage temperature controller set value is adjusted to 75 ° C, keep 8min., let the epoxy primer dry; the second stage temperature controller set value is raised to 250 ° C, Hold for 20 min.; cut off the heating power and slowly cool to below 50 °C.
  • a 3LPP pipe of the crucible 610 has a joint structure including a butt joint steel pipe 6, a prefabricated anticorrosion layer 7 at both ends, and a joint portion.
  • An epoxy primer layer 8 is disposed on the outer wall of the steel pipe at the mouth portion, and the outer periphery of the epoxy primer layer 8 is covered with a thermoplastic filler sheet 5, and the thermoplastic filler sheet 5 is entirely covered with an epoxy primer layer. 8 and overlapping with the prefabricated anticorrosive layer 7 at both ends, a metal inner liner 4 is disposed around the outer periphery of the thermoplastic patch sheet 5, and the adjacent layers are firmly bonded to each other to form a whole.
  • the thickness of the prefabricated anti-corrosion layer 7 is 3 mm, the surface of the steel tube at the repairing portion is rough, and the anchoring depth is 40-80 ⁇ m; the epoxy primer 8 is formed by curing the solvent-free liquid epoxy coating, and the thickness is 120-180 ⁇ m; the thermoplastic patch 5 Width 400mm, thickness 3.3mm, and the prefabricated anti-corrosion layer 7 at both ends and its own overlap Fully melted and integrated to form an equal-diameter polyolefin layer; the annular bead at the butt joint of the steel tube is embedded in the thermoplastic filler sheet and does not protrude outward; the metal liner board 4 is wrapped in the thermoplastic filler sheet 5 into a cylinder The shape has an overlap of 80mm at the head and tail, a width of 500mm and a thickness of 0.3mm.
  • the material of the thermoplastic patch sheet 5 is a mixture of a grafted polypropylene copolymer and polypropylene, and the blending ratio thereof is 1:4.
  • the grafted polypropylene copolymer refers to a graft copolymer of maleic anhydride and polypropylene.
  • the metal inner lining plate 4 is made of 304-1/2H stainless steel cold rolled plate.
  • the overlapping portion of the metal inner liner 4 head and tail is integrally bonded by an adhesive film which is adhered to the outer surface of the inner metal sheet in advance, and the adhesive film has a thickness of 0.1 mm, and the material is the same as that of the thermoplastic filler sheet.
  • a 3LPE pipe of ⁇ 1219, prefabricated anti-corrosion layer thickness 3.7mm, patch piece 5 width 450mm, thickness 4.6mm, repairing machine and construction method are as follows:
  • the fitting device is a metal inner liner 4, an electric heating device 3 and a steel hoop 1 from the inside to the outside.
  • the metal inner liner 4 is wrapped in a cylindrical shape outside the patch sheet 5, and the head and tail portions are partially overlapped.
  • the metal inner liner 4 has a length of 3950 mm, a width of 690 mm, and a thickness of 0.5 mm, and is made of a 3-type aluminum alloy.
  • the electric heating device 3 is an electric heating coil, which is composed of two semicircular electric heating coils, and one end of the semicircular electric heating coil is connected by a hinge.
  • the total length of the electric heating ring is 3830 mm, the width is 590 mm, and the thickness is 6 mm.
  • the inner circle of one of the electric heating coils extends a 70 mm long and 1.0 mm thick pressing piece, and is inserted between another electric heating ring and the inner lining plate during installation.
  • the total power of the electric heating coil is 40 kW, and the power of the semicircular electric heating coil is half of the total power.
  • the electric heating ring is a stainless steel mica heating ring, and the inner and outer surfaces are smooth and smooth.
  • the power supply is 220V or 380V common power frequency AC.
  • the steel hoop 1 is wrapped in a cylindrical shape outside the electric heating ring, and the inner surface is smooth and smooth.
  • the material is 316-3/4H stainless steel cold rolled sheet.
  • the ferrule 1 has a thickness of 0.8 mm, the same width as the electric heating ring, and a length of 3868 mm.
  • the end of the steel hoop 1 is locked by a hexagon socket bolt, and the number of bolts is seven, evenly distributed in the width direction of the steel hoop 1.
  • the thread performance grade is 8.8, the surface is oxidized, coated with molybdenum grease, nominal diameter M10, and each bolt is equipped with a spring washer.
  • the total locking force is 7000kgf
  • each hexagon socket bolt has a locking force of 1000kgf and a tightening torque of 22Nm.
  • the construction method includes the following steps:
  • Preheating of the steel pipe preheating the steel pipe at the pipe joint to 40 ° C;
  • the patch 5 is covered: the surface of the epoxy primer is covered with a patch 5, and the material of the patch 5 is a maleic anhydride grafted polyethylene copolymer, and the graft ratio is 0.25 wt%;
  • the length is the same as the minimum length of the exposed steel pipe at the welded joint, and the ends of the straight portion are uniformly thinned, each end has a width of 60 mm; the length of the straight portion of the patch sheet 5 (in the circumferential direction of the pipe) is smaller than the circumference of the pipe. 30mm, both ends of the straight part are also uniform thinning zone, each end length is 60mm;
  • wrapped metal inner liner 4 The metal inner liner 4 is wrapped on the patch sheet 5, and the outer surface of the metal inner liner 4 is pre-adhered with an adhesive film having a thickness of 0.05 mm; one side of the film and the metal inner liner The ends are flush, the other three sides are narrower than the overlapping area by 5 mm; the adhesive film is made of maleic anhydride grafted polyethylene copolymer, and the graft ratio is 0.25 wt%;
  • wrapping electric heating device 3 wrapping the electric heating device 3 outside the metal inner liner 4, and placing a temperature sensor therebetween, the temperature measuring point of the sensor should be placed at an inner region of at least 50 mm from the edge of the electric heating device 3;
  • Program temperature control turn on the power, adjust the temperature controller to 220 ° C, keep it for 50 min., re-tighten with a force wrench every 1 to 5 minutes. The torque should reach the specified initial torque when tightening. 30% to 90%. Turn off the heating power and slowly cool to below 50 °C.
  • thermoplastic patch sheet 5 which completely covers the epoxy primer layer 8 and is overlapped with the pre-prepared anti-corrosion layer 7 at both ends, in thermoplastic
  • a metal inner liner 4 is provided on the outer periphery of the patch sheet 5, and the adjacent layers are firmly bonded to each other to form an integral body.
  • the thickness of the prefabricated anti-corrosion layer 7 is 3.7 mm, the surface of the steel tube at the repairing portion is rough, and the anchoring depth is 50-100 ⁇ m; the epoxy primer 8 is formed by curing the epoxy powder coating, the thickness is 150-230 ⁇ m; the width of the thermoplastic patch sheet 5 is 5 450mm, thickness 4.6mm, fully fused with the prefabricated anti-corrosion layer 7 at both ends and its own joint Synthesize one body to form an equal-diameter polyolefin layer; the annular bead at the butt joint of the steel pipe is embedded in the thermoplastic filler sheet and does not protrude outward; the metal liner board 4 is wrapped in the cylindrical shape of the thermoplastic filler sheet 5, The head and tail have a 120mm overlap, a width of 690mm and a thickness of 0.5mm.
  • the material of the patch is a mixture of grafted polyethylene copolymer and polyethylene, and the blending ratio is 1:2.
  • the chemical composition of the grafted polyethylene copolymer is a graft copolymer of maleic anhydride and polyethylene.
  • the metal inner lining plate is made of 3 type aluminum alloy.
  • the overlapping portion of the metal liner board head and tail is bonded by an adhesive film which is adhered to the outer surface of the inner metal sheet in advance, and the adhesive film has a thickness of 0.2 mm, and the material is the same as that of the thermoplastic patch sheet.
  • a pipe filling method includes the following steps in sequence:
  • Heat shrink sleeve repair the heat shrink sleeve is wrapped to the filling portion, and the heat shrink sleeve is heated by the intermediate frequency electric heater, and the electric heating temperature is 140-160 ° C, so that the heat shrink sleeve shrinks and wraps to the filling portion.
  • the filling operation is completed, and the results of the effect evaluation are shown in Table 1.
  • Table 1 shows the evaluation results of the effects of the joints of the respective examples and the comparative pipes.

Abstract

一种补口机具及施工方法和新型补口结构被公开。机具从内至外依次为金属内衬板（4）、电热装置（3）和钢箍（1）。施工方法包括步骤：a.表面处理 b.钢管预热 c.涂刷底漆 d.补口片裹覆 e.包裹金属内衬板 f.包裹电热装置 g.包裹并锁紧钢箍 h.程序控温 i.拆除机具。新型补口结构，包括对接钢管（6）、两端预制防腐层（7）和补口部位，在补口部位钢管外壁设有环氧底漆层（8），环氧底漆层（8）的外周围裹覆一层补口片（5），补口片（5）的外周围设有金属内衬板（4）。该补口机具简单可靠，采用钢箍锁紧加压，能够对补口片在软化粘接过程中施加巨大压力，提高对环氧层的粘接强度；23℃时的剥离强度达到250N/cm以上，50℃时的剥离强度达到100N/cm以上，分别为热收缩套(带)补口的2倍和5倍以上。

Description

一种补口机具及施工方法和新型补口结构 技术领域
本发明属于输气、输油管道施工技术领域，具体涉及一种补口机具及施工方法和新型补口结构。
背景技术
油气输送管道施工中所使用的钢制管道，必须预先经过防腐处理，3LPE、3LPP防腐层是管道外防腐中普遍采用的防腐结构。而在管道防腐过程中往往会预留焊接口，一般宽度为100-150mm,对接钢管在预留的焊口处相互焊接，两端预制防腐层裹覆在对接钢管上。钢制管道焊接口的防腐是在施工现场完成的，其采用的管道补口技术对管线的整体防腐效果具有重大的影响，因为它关系到整条管线的最终防腐质量。无论预制工厂内3LPE、3LPP防腐层质量如何优良，如果现场补口效果不好就会导致钢制管道产生严重腐蚀，使埋地管道的使用寿命缩短，甚至造成泄漏等严重后果。
3LPE、3LPP防腐管道的焊接口防腐普遍采用热缩套(带)补口技术，该技术的施工方法为：对补口底材进行处理后涂刷上环氧底漆，底漆表干后包覆收缩套(带)，烘烤热收缩套(带)使其收缩，同时使热收缩套上的热熔胶熔化，达到合适程度后停止加热，待热收缩套自然冷却后固定在补口处。这种传统的热缩套补口技术在使用中存在如下缺点：
1.热缩套(带)一般由人工手持烤把用火焰烘烤，温度准确性和均匀性难以准确控制。温度偏低保证不了粘接效果，局部过热容易使热缩套(带)发生炭化，加热不均匀时收缩不一致导致气泡及褶皱，补口质量难以保证。
2.热缩套(带)所用的热熔胶极性强，分子量低，与两端防腐层表面的PE或PP相容性不好，加之交联聚乙烯基材受热时弹性收缩力不大，对热熔胶施加的压力有限，热熔胶与两端防腐层之间无法形成可靠粘接，埋地后极易发生脱粘开裂现象，导致补口失效。
3.辐射交联聚乙烯热收缩带(套)须经挤出成型、辐射交联、扩径、冷却、涂胶等多道工序制得，成本极高，且无法热塑回收，对环境会造成一定破坏。
发明内容
为克服上述现有技术的不足，本发明的目的在于提供一种结构简单、操作方便的补口机具。
本发明的另一个目的在于提供上述补口机具的施工方法。
本发明的再一目的是提供一种利用上述补口机具及施工方法制备的结构新颖、防腐效果好的新型补口结构。
本发明是通过以下技术方案实现的：
一种补口机具，从内至外依次为金属内衬板、电热装置和钢箍，所述金属内衬板成圆筒形状，头尾部分重叠；所述电热装置包裹在金属内衬板外；所述钢箍包裹在电热装置外成圆筒状，钢箍头尾通过机械锁紧装置锁紧。
金属内衬板的长度比两端预制防腐层周长长20～120mm，宽度比补口片宽20～240mm，厚度为0.2～1.0mm。金属内衬板头尾两端可预先钣金成圆弧形状，圆弧半径与钢管半径相同，两端弧度各自为30°～60°。金属内衬板材质选自不锈钢、镀锌钢、镀锡钢、镀铝钢、镀镍钢、镀铬钢、纯铝、铝合金、纯铜或铜合金中的一种或几种，金属内衬板贴补口片一面可经毛化处理，使锚纹深度达到5～50μm。
电热装置可为电热圈或电热片，优选电热圈。
电热圈由两块半圆电热圈组成，半圆电热圈之间可以完全独立，也可以用铰链将其中一端连接起来。电热圈的总长度比两端预制防腐层周长短5～50mm，确保在补口施工时不发生头尾重叠；宽度比补口片宽0～220mm，但比金属内衬板窄20～100mm。电热圈厚度为3～20mm，连接两个半圆电热圈的铰链厚度应小于等于电热圈厚度，施工中才不会影响电热圈与金属内衬板和钢箍的紧密贴合。在两个半圆电热圈头尾接缝处，其中一块电热圈的内圆延伸出长30～80mm、厚0.5～1.0mm的压片，安装时伸入另一块电热圈与金属内衬板之间，可更好地传递压力，防止金属内衬板在接缝处凸起变形。
电热圈的总功率按以下公式确定：总功率＝钢管直径×(0.02～0.06)，公式中钢管直径单位为mm，总功率单位为kW，半圆电热圈功率为总功率一半。电热圈可以是不锈钢云母加热圈、铸铝加热圈、铸铜加热圈和不锈钢陶瓷加热圈等类型，其内外表面平整光滑。接线端子在电热圈主体圆柱面之外，以免影响电热圈与金属内衬板和钢箍的紧密贴合。电源为220V或380V普通工频交流电。
钢箍材料为碳钢、合金钢或不锈钢。钢箍厚度0.5～1.5mm，宽度与电热圈相同，有效长度比电热圈外圆周长短10～50mm，在补口施工时不至于发生头尾重叠。
钢箍头尾通过机械锁紧装置锁紧，机械锁紧装置包括螺纹锁紧机构、偏心轮锁紧机构、斜面锁紧机构、四杆锁紧机构等，优选使用螺纹锁紧机构。在使用螺纹锁紧机构时，钢箍头尾分别外卷包住一个连接杆，连接杆可以绕轴自由转动，方便内六角螺栓连接锁紧。螺栓数量为3～9个，均匀分布在钢箍的宽度方向上。总的锁紧力按以下公式计算范围：锁紧力＝(0.25～2.0)×钢管直径×钢箍宽度，公式中锁紧力的单位为kgf，钢管直径和钢箍宽度的单位为cm。确定锁紧力后，应根据选定的螺栓数量、螺纹表面状态、润滑情况及相关设计规范确定内六角螺栓规格和拧紧扭矩。施工中补口片受热软化后锁紧力可能变小，为尽量保持锁紧力，可使用弹簧垫圈或弹簧。
一种上述补口机具的施工方法，至少包括以下步骤：
a.表面处理：对管道补口部位的钢管表面进行除污和喷砂除锈；
b.钢管预热：将管道补口部位的钢管预热到30～80℃；
c.涂刷底漆：将环氧底漆均匀涂覆在补口部位钢管的整个表面；
d.补口片裹覆：在环氧底漆的表面裹覆补口片；
e.包裹金属内衬板：将金属内衬板包裹在补口片上；
f.包裹电热装置：将电热装置包裹在金属内衬板外,二者中间放置温度传感器；
g.包裹并锁紧钢箍：将钢箍包裹在电热装置外，钢箍头尾通过机械锁紧装置锁紧；
h.程序控温：接通电源，第一阶段温控仪设定值调至50～100℃，保持0～30min.，让环氧底漆表干；第二阶段温控仪设定值上调至180～280℃，保持10～60min.；切断加热电源，缓慢冷却至50℃以下；
i.拆除机具：松开机械锁紧装置，顺序拆除钢箍和电热装置。
本发明步骤a中，对补口部位钢管表面进行喷砂处理后，钢管表面质量应达到Sa2.5级，喷砂除锈后随即用压缩空气将钢管表面灰尘清除干净。
本发明步骤b中，可以采用多种现有方式，如电热圈加热、电磁感应加热、红外加热、液化气火焰加热等，将管道补口部位的钢管预热到30～80℃(用经过 校验的红外线测温计监测温度，外界温度低时可适当提高预热温度)。加热的目的之一是除去吸附在钢管上的水份，另一个作用是有利于环氧底漆快速表干。
本发明步骤c中，按环氧底漆的操作指南，将环氧底漆用刷子沿着管道周向涂刷或使用喷涂设备喷涂，避免气泡，使环氧底漆均匀地涂覆在补口部位钢管的整个表面。如果环氧底漆温度过低造成涂覆不便，可将环氧底漆适当加热。
本发明步骤d中，考虑到野外施工中雨雪沙尘的影响，在涂覆环氧底漆后立即裹覆补口片材，这样就能避免环氧底漆在等待表干的过程中受到污染。
本发明用补口片代替现有的热缩套(带)，对于3LPE防腐层，所述补口片的材质为马来酸酐接枝聚乙烯共聚物与聚乙烯的共混物，其共混比例为1:0～1:10，总体接枝率达到0.1wt％以上为宜。对于3LPP防腐层，所述补口片的材质为马来酸酐接枝聚丙烯共聚物与聚丙烯的共混物，其共混比例为1:0～1:10，总体接枝率达到0.1wt％以上为宜。
补口片宽度方向(沿管道轴向方向)中间有圆弧形凹槽，凹槽最深处为1.0～3.0mm，其宽度比补口部位环形焊道宽度小0～5mm为宜。凹槽可使补口片裹覆时紧贴钢管，也有利于金属内衬板始终紧贴补口片材，提高补口质量。
补口片宽度方向平直部分的长度与焊口处裸露钢管可能的最小长度一致，平直部分两端为均匀减薄区，每端宽度在50～100mm为宜。补口片长度方向(沿管道周向方向)平直部分最短比管道周长小60mm，最长比管道周长多100mm，平直部分两端同样为均匀减薄区，每端长度在30～60mm为宜。均匀减薄区可使补口片与两端预制防腐层及自身搭接平顺，有利于金属内衬板始终紧贴补口片材，提高补口质量。
当补口部位裸露钢管的长度变化范围过大时，可根据焊道两侧裸露钢管的长度定制补口片，使补口片凹槽两侧平直部分长度与之对应。
补口片平直部分的厚度应略大于两端防腐层厚度，达到两端防腐层厚度的100～150％为宜。
补口片裹覆时可用紧绳器等装置拉紧，然后用固定片或不干胶固定，也可使用电烙铁焊接固定。
本发明步骤e中，包裹好的金属内衬板可用不干胶带临时固定，待包裹上电热圈后通过左右移动电热圈的位置以便撕掉不干胶。当施工完成后，金属内衬板 会与补口片牢固地粘接在一起，成为一个整体。金属内衬板裹成圆筒形状时头尾有部分重叠，为了将重叠部分也粘接成为一体，金属内衬板的外表面预先粘附有胶粘剂薄膜，厚度0.05～0.2mm。薄膜的一边与金属内衬板端部齐平，其余三边比重叠区域窄5～20mm，目的是防止受热时胶粘剂溢出粘连电热圈。
胶粘剂薄膜的材质为马来酸酐接枝聚乙烯/聚丙烯共聚物与聚乙烯/聚丙烯的共混物，其共混比例为1:0～1:10，总体接枝率达到0.1wt％以上为宜。
本发明步骤f中，应选用纤细的温度传感器，传感器测温点应放置在距离电热圈边缘至少50mm的内部区域。
本发明步骤g中，可用电动工具快速拧紧内六角螺栓，最后用测力扳手紧固至规定扭矩。为减小摩擦力对扭矩的影响，减小锁紧力波动范围，内六角螺栓应涂抹润滑脂。在逐步拧紧内六角螺栓的过程中，金属内衬板也相应收紧，补口片和金属内衬板之间及补口机具各层之间实现紧密贴合。
本发明步骤h中，补口片在第二阶段受热软化后锁紧力可能减小，可每隔1～5分钟用测力扳手重新紧固，紧固时扭矩应达到规定初始扭矩的30％～90％。
在不需要补口片与金属内衬板粘接的情况下，补口片应采用双层结构，即在上述补口片的外层另外涂敷一层聚乙烯/聚丙烯，其厚度为0.1～0.5mm即可。
一种新型补口结构，包括对接钢管、两端预制防腐层和补口部位,其特征在于，在补口部位钢管外壁设有环氧底漆层，所述环氧底漆层的外周围裹覆一层热塑性补口片，所述热塑性补口片全部覆盖环氧底漆层且与两端预制防腐层相搭接，在热塑性补口片的外周围设有金属金属内衬板，相邻各层之间牢固粘接，形成整体。
补口部位钢管表面粗糙，锚纹深度达到10～100μm。
所述环氧底漆层是无溶剂液体环氧涂料或环氧粉末涂料固化所形成，厚度大于50μm。
热塑性补口片与两端预制防腐层及自身搭接处完全熔合成一体，所述热塑性补口片主体厚度为直管防腐层厚度的100～150％，宽度比补口部位钢管的最小长度长100～200mm。
钢管对接处的环形焊道包埋在热塑性补口片中，不向外凸起。金属内衬板包裹在热塑性补口片外成圆筒形状，头尾有20～120mm的重叠，宽度比热塑性补口 片宽20～240mm，厚度为0.2～1.0mm。金属内衬板头尾的重叠部分由预先粘附在内层金属板外表面的胶粘剂薄膜粘接成一体。胶粘剂薄膜厚度0.05～0.2mm，材质为接枝聚乙烯/聚丙烯共聚物与聚乙烯/聚丙烯的混合物，其共混比例为1:0～1:7，总体接枝率为0.15wt％以上；接枝聚乙烯/聚丙烯共聚物是指马来酸酐、丙烯酸、甲基丙烯酸、衣康酸或缩水甘油酯与聚乙烯/聚丙烯的接枝共聚物。
热塑性补口片的材质是接枝聚乙烯/聚丙烯共聚物与聚乙烯/聚丙烯的混合物，其共混比例为1:0～1:7，总体接枝率为0.15wt％以上；所述接枝聚乙烯/聚丙烯共聚物是指马来酸酐、丙烯酸、甲基丙烯酸、衣康酸或缩水甘油酯与聚乙烯/聚丙烯的接枝共聚物。
金属内衬板的材质选自不锈钢、镀锌钢、镀锡钢、镀铝钢、镀镍钢、镀铬钢、纯铝、铝合金、纯铜或铜合金中的一种或几种。
本发明与现有技术相比，具有如下优点：
1、金属内衬板防锈能力强，且与补口片牢固粘接为一体，极大提高了补口层对可见光、紫外光、水、氧气及水蒸气的阻隔性，对尖锐物体机械损伤的抵抗力也得到加强，补口层寿命大幅提升。
2.本发明采用钢箍锁紧加压，能够对补口片在软化粘接过程中施加巨大压力，大幅提高对环氧层的粘接强度；23℃的剥离强度可达到250N/cm以上，50℃的剥离强度达到100N/cm以上，分别为热收缩套(带)补口的2倍和5倍以上；
3.采用本发明的施工技术，补口结构与直管3LPE、3LPP防腐层结构类似，补口片本身保持热塑性，能够与两端预制防腐层面层及补口片自身搭接处完全熔合成一体，密封效果极好；
4.本发明的补口机具，为环氧底漆和补口片的物理化学转化提供稳定可控的温度和压力条件，施工质量好，品质稳定性高；
5.本发明的补口机具简单可靠，成本低廉，施工费用低；
6.本发明的补口片无须辐射交联，成本低廉，边角料可循环使用，不污染
环境。
附图说明
图1为本发明的补口机具处于工作状态的示意图；
其中，1钢箍  2螺纹锁紧机构  3电热装置  4金属内衬板  5补口片。
图2为本发明的补口结构示意图；
其中，4金属内衬板  5补口片  6对接钢管  7两端预制防腐层  8环氧底漆层。
具体实施方式
下面通过具体实施方式来进一步说明本发明，以下实施例为本发明较佳的实施方式，但本发明的实施方式并不受下述实施例的限制。
实施例1：
一种Ф610的3LPP管道，预制防腐层厚度3mm，补口片5宽度400mm，厚度3.3mm，补口机具及施工方法如下：
补口机具从内至外依次为金属内衬板4、电热装置3和钢箍1。
金属内衬板4包裹在补口片5外成圆筒形状，头尾部分重叠。金属内衬板4长度为2000mm，宽度500mm，厚度0.3mm，材质选用304-1/2H不锈钢冷轧板。金属内衬板4头尾两端预先钣金成圆弧形状，圆弧半径为305mm，两端弧度都为35°。
电热装置3为电热圈，由两块半圆电热圈组成，半圆电热圈之间用铰链将其中一端连接起来。电热圈的总长度为1920mm，宽度450mm，厚度为5mm。
电热圈的总功率为18kW，半圆电热圈功率为总功率一半。电热圈为不锈钢云母加热圈，内外表面平整光滑。电源为220V或380V普通工频交流电。
钢箍1包裹在电热圈外成圆筒状，内表面平整光滑，材料为304-1/2H不锈钢冷轧板。钢箍1厚度0.5mm，宽度与电热圈相同，长度为1945mm。
钢箍1头尾通过螺纹锁紧机构2锁紧，螺栓数量为5个，均匀分布在钢箍1的宽度方向上。螺纹性能等级选6.8级，表面氧化处理，涂有含钼润滑脂，公称直径M8，每个螺栓配一个弹簧垫圈。总的锁紧力为3500kgf，每个内六角螺栓锁紧力为700kgf，拧紧扭矩为12Nm。
施工方法包括以下步骤：
a.表面处理：对管道补口部位的钢管表面进行除污和喷砂除锈，钢管表面质量应达到Sa2.5级，喷砂除锈后随即用压缩空气将钢管表面灰尘清除干净；
b.钢管预热：将管道补口部位的钢管预热到65℃；
c.涂刷底漆：将环氧底漆均匀涂覆在补口部位钢管的整个表面；
d.补口片5裹覆：在环氧底漆的表面裹覆补口片5，补口片5的材质为聚丙烯与马来酸酐接枝聚丙烯共聚物的4:1共混物，补口片5宽度方向(沿管道轴向方向)中间有圆弧形凹槽，凹槽最深处为1.5mm，其宽度比焊口处环形焊道宽度小2mm；补口片5宽度方向平直部分的长度与焊口处裸露钢管最小长度一致，平直部分两端为均匀减薄区，每端宽度为80mm；补口片5长度方向(沿管道周向方向)平直部分的长度大于管道周长50mm，平直部分两端同样为均匀减薄区，每端长度为50mm；
e.包裹金属内衬板4：将金属内衬板4包裹在补口片5上，金属内衬板4的外表面预先粘附有胶粘剂薄膜，厚度0.1mm；薄膜的一边与金属内衬板端部齐平，其余三边比重叠区域窄10mm；胶粘剂薄膜的材质为聚丙烯与马来酸酐接枝聚丙烯共聚物的4:1共混物；
f.包裹电热装置3：将电热装置3包裹在金属内衬板4外,二者中间放置温度传感器，传感器测温点应放置在距离电热装置3边缘至少50mm的内部区域；
g.包裹并锁紧钢箍1：将钢箍1包裹在电热装置3外，钢箍1头尾通过螺纹锁紧机构2锁紧。
h.程序控温：接通电源，第一阶段温控仪设定值调至75℃，保持8min.，让环氧底漆表干；第二阶段温控仪设定值上调至250℃，保持20min.；切断加热电源，缓慢冷却至50℃以下。
i.拆除机具：松开内六角螺栓，顺序拆除钢箍1和电热装置3。
如图2示，一种Ф610的3LPP管道，补口结构包括对接钢管6、两端预制防腐层7和补口部位。在补口部位钢管外壁设有环氧底漆层8，所述环氧底漆层8的外周围裹覆一层热塑性补口片5，所述热塑性补口片5全部覆盖环氧底漆层8且与两端预制防腐层7相搭接，在热塑性补口片5的外周围设有金属内衬板4，相邻各层之间牢固粘接，形成整体。
预制防腐层7的厚度3mm，补口部位钢管表面粗糙，锚纹深度达到40～80μm；环氧底漆8是无溶剂液体环氧涂料固化所形成，厚度为120～180μm；热塑性补口片5宽度400mm，厚度3.3mm，与两端预制防腐层7及自身搭接处完 全熔合成一体，形成等径聚烯烃层；钢管对接处的环形焊道包埋在热塑性补口片中，不向外凸起；金属内衬板4包裹在热塑性补口片5外成圆筒形状，头尾有80mm的重叠，宽度为500mm，厚度为0.3mm。
热塑性补口片5的材质是接枝聚丙烯共聚物与聚丙烯的混合物，其共混比例为1:4，接枝聚丙烯共聚物是指马来酸酐与聚丙烯的接枝共聚物。
金属内衬板4材质选用304-1/2H不锈钢冷轧板。
金属内衬板4头尾的重叠部分由预先粘附在内层金属板外表面的胶粘剂薄膜粘接成一体，胶粘剂薄膜厚度0.1mm，材质与热塑性补口片相同。
实施例2：
一种Ф1219的3LPE管道，预制防腐层厚度3.7mm，补口片5宽度450mm，厚度4.6mm，补口机具及施工方法如下：
补口机具从内至外依次为金属内衬板4、电热装置3和钢箍1。
金属内衬板4包裹在补口片5外成圆筒形状，头尾部分重叠。金属内衬板4长度为3950mm，宽度690mm，厚度0.5mm，材质选用3型铝合金。
电热装置3为电热圈，由两块半圆电热圈组成，半圆电热圈之间用铰链将其中一端连接起来。电热圈的总长度为3830mm，宽度590mm，厚度为6mm。在两个半圆电热圈头尾接缝处，其中一块电热圈的内圆延伸出长70mm、厚1.0mm的压片，安装时伸入另一块电热圈与内衬板之间。
电热圈的总功率为40kW，半圆电热圈功率为总功率一半。电热圈为不锈钢云母加热圈，内外表面平整光滑。电源为220V或380V普通工频交流电。
钢箍1包裹在电热圈外成圆筒状，内表面平整光滑。材料为316-3/4H不锈钢冷轧板。钢箍1厚度0.8mm，宽度与电热圈相同，长度为3868mm。
钢箍1头尾通过内六角螺栓锁紧，螺栓数量为7个，均匀分布在钢箍1的宽度方向上。螺纹性能等级选8.8级，表面氧化处理，涂有含钼润滑脂，公称直径M10，每个螺栓配一个弹簧垫圈。总的锁紧力为7000kgf，每个内六角螺栓锁紧力为1000kgf，拧紧扭矩为22Nm。
施工方法包括以下步骤：
a.表面处理：对管道补口部位的钢管表面进行除污和喷砂除锈，使钢管表面质量达到Sa2.5级，除锈后随即用压缩空气将钢管表面灰尘清除干净；
b.钢管预热：将管道补口部位的钢管预热到40℃；
c.涂刷底漆：将环氧底漆均匀涂覆在补口部位钢管的整个表面；
d.补口片5裹覆：在环氧底漆的表面裹覆补口片5，补口片5的材质为马来酸酐接枝聚乙烯共聚物，接枝率为0.25wt％；补口片5宽度方向(沿管道轴向方向)中间有圆弧形凹槽，凹槽最深处为2.0mm，其宽度比焊口处环形焊道宽度小3mm；补口片5宽度方向平直部分的长度与焊口处裸露钢管最小长度一致，平直部分两端为均匀减薄区，每端宽度为60mm；补口片5长度方向(沿管道周向方向)平直部分的长度小于管道周长30mm，平直部分两端同样为均匀减薄区，每端长度为60mm；
e.包裹金属内衬板4：将金属内衬板4包裹在补口片5上，金属内衬板4的外表面预先粘附有胶粘剂薄膜，厚度0.05mm；薄膜的一边与金属内衬板端部齐平，其余三边比重叠区域窄5mm；胶粘剂薄膜的材质为马来酸酐接枝聚乙烯共聚物，接枝率为0.25wt％；
f.包裹电热装置3：将电热装置3包裹在金属内衬板4外,二者中间放置温度传感器，传感器测温点应放置在距离电热装置3边缘至少50mm的内部区域；
g.包裹并锁紧钢箍1：将钢箍1包裹在电热装置外，钢箍1头尾通过螺纹锁紧机构2锁紧。
h.程序控温：接通电源，温控仪设定值调至220℃，保持50min.，可每隔1～5分钟用测力扳手重新紧固，紧固时扭矩应达到规定初始扭矩的30％～90％。切断加热电源，缓慢冷却至50℃以下。
i.拆除机具：松开内六角螺栓，顺序拆除钢箍和电热装置。利用上述机具和施工方法制备得到的一种Ф1219的3LPE管道，补口结构包括对接钢管6、两端预制防腐层7和补口部位,在补口部位钢管外壁设有环氧底漆层8，所述环氧底漆层8的外周围裹覆一层热塑性补口片5，所述热塑性补口片5全部覆盖环氧底漆层8且与两端预制防腐层7相搭接，在热塑性补口片5的外周围设有金属内衬板4，相邻各层之间牢固粘接，形成整体。
预制防腐层7的厚度3.7mm，补口部位钢管表面粗糙，锚纹深度达到50～100μm；环氧底漆8是环氧粉末涂料固化所形成，厚度为150～230μm；热塑性补口片5宽度450mm，厚度4.6mm，与两端预制防腐层7及自身搭接处完全熔 合成一体，形成等径聚烯烃层；钢管对接处的环形焊道包埋在热塑性补口片中，不向外凸起；金属内衬板4包裹在热塑性补口片5外成圆筒形状，头尾有120mm的重叠，宽度为690mm，厚度为0.5mm。
补口片的材质是接枝聚乙烯共聚物与聚乙烯的混合物，其共混比例为1:2，接枝聚乙烯共聚物的化学成分是马来酸酐与聚乙烯的接枝共聚物。
金属内衬板材质选用3型铝合金。
金属内衬板头尾的重叠部分由预先粘附在内层金属板外表面的胶粘剂薄膜粘接成一体，胶粘剂薄膜厚度0.2mm，材质与热塑性补口片相同。
对比例1：
一种管道补口方法依次包括以下步骤：
a.表面处理：对管道补口部位的钢管表面进行除污、喷砂除锈，使钢管表面质量达到Sa2.5级，除锈后随即用压缩空气将钢管表面灰尘清除干净；
b.表面预热：用电磁感应电热方式将管道补口部位的钢管表面预热到50～75℃，用经过校验的红外线测温计监测温度，外界温度低时可适当提高预热温度；
c.涂刷底漆：将环氧底漆均匀涂覆在补口部位钢管的整个表面；
d.热缩套补口：将热缩套包覆到补口部位，用中频电热器对热缩套进行电热，电热温度为140～160℃，使热缩套收缩包覆到补口部位，补口操作完成，效果评价结果如表1所示。
表1为各实施例及对比例管道补口的效果评价结果
Figure PCTCN2015097217-appb-000001
Figure PCTCN2015097217-appb-000002
测试标准或方法：
剥离强度：GB/T 23257～2009；
密封效果：GB/T 23257～2009。

Claims (33)

  1. 一种补口机具，其特征在于：从内至外依次为金属内衬板、电热装置和钢箍，所述金属内衬板成圆筒形状，头尾部分重叠；所述电热装置包裹在金属内衬板外；所述钢箍包裹在电热装置外成圆筒状，钢箍头尾通过机械锁紧装置锁紧。
  2. 根据权利要求1所述的补口机具，其特征在于：金属内衬板的长度比两端预制防腐层周长长20～120mm，宽度比补口片宽20～240mm，厚度为0.2～1.0mm。
  3. 根据权利要求1所述的补口机具，其特征在于：金属内衬板头尾两端可预先钣金成圆弧形状，圆弧半径与钢管半径相同，两端弧度各自为30°～60°。
  4. 根据权利要求1所述的补口机具，其特征在于：金属内衬板材质选自不锈钢、镀锌钢、镀锡钢、镀铝钢、镀镍钢、镀铬钢、纯铝、铝合金、纯铜或铜合金中的一种或几种；金属内衬板贴补口片一面可经毛化处理，使锚纹深度达到5～50μm。
  5. 根据权利要求1所述的补口机具，其特征在于：所述电热装置为电热圈或电热片，优选电热圈。
  6. 根据权利要求5所述的补口机具，其特征在于：电热圈由两块半圆电热圈组成，两块半圆电热圈之间完全独立或用铰链将其中一端连接起来。
  7. 根据权利要求6所述的补口机具，其特征在于：电热圈的总长度比两端预制防腐层周长短5～50mm；宽度比补口片宽0～220mm，但比金属内衬板窄20～100mm；电热圈厚度为3～20mm。
  8. 根据权利要求6所述的补口机具，其特征在于：在两个半圆电热圈头尾接缝处，其中一块电热圈的内圆延伸出长30～80mm、厚0.5～1.0mm的压片，安装时伸入另一块电热圈与金属内衬板之间。
  9. 根据权利要求5所述的补口机具，其特征在于：电热圈为不锈钢云母加热圈、铸铝加热圈、铸铜加热圈或不锈钢陶瓷加热圈，其内外表面平整光滑，接线端子在电热圈主体圆柱面之外。
  10. 根据权利要求5所述的补口机具，其特征在于：钢箍厚度0.5～1.5mm，宽度与电热圈相同，有效长度比电热圈外圆周长短10～50mm。
  11. 根据权利要求10所述的补口机具，其特征在于：钢箍材料为碳钢、合金钢或不锈钢。
  12. 根据权利要求1所述的补口机具，其特征在于：机械锁紧装置为螺纹锁紧机构、偏心轮锁紧机构、斜面锁紧机构或四杆锁紧机构，优选为螺纹锁紧机构。
  13. 根据权利要求12所述的补口机具，其特征在于：采用螺纹锁紧机构锁紧钢箍时，钢箍头尾分别外卷包住一个连接杆，连接杆可以绕轴自由转动，方便内六角螺栓连接锁紧，螺栓数量为3～9个，均匀分布在钢箍的宽度方向上。
  14. 根据权利要求13所述的补口机具，其特征在于：内六角螺栓连接时可使用弹簧垫圈或弹簧。
  15. 一种权利要求1-14任一项所述补口机具的施工方法，其特征在于至少包括如下步骤：
    a.表面处理：对管道补口部位的钢管表面进行除污和喷砂除锈；
    b.钢管预热：将管道补口部位的钢管预热到30～80℃；
    c.涂刷底漆：将环氧底漆均匀涂覆在补口部位钢管的整个表面；
    d.补口片裹覆：在环氧底漆的表面裹覆补口片；
    e.包裹金属内衬板：将金属内衬板包裹在补口片上；
    f.包裹电热装置：将电热装置包裹在金属内衬板外,二者中间放置温度传感器；
    g.包裹并锁紧钢箍：将钢箍包裹在电热装置外，钢箍头尾通过机械锁紧装置锁紧；
    h.程序控温：接通电源，第一阶段温控仪设定值调至50～100℃，保持0～30min.，让环氧底漆表干；第二阶段温控仪设定值上调至180～280℃，保持10～60min.；切断加热电源，缓慢冷却至50℃以下；
    i.拆除机具：松开机械锁紧装置，顺序拆除钢箍和电热装置。
  16. 根据权利要求15所述的施工方法，其特征在于：步骤b中，预热的方式为电热圈加热、电磁感应加热、红外加热或液化气火焰加热。
  17. 根据权利要求15所述的施工方法，其特征在于：对于3LPE防腐层，所述补口片的材质为马来酸酐接枝聚乙烯共聚物与聚乙烯的共混物，其共混比例为1:0～1:10，总体接枝率达到0.1wt％以上；对于3LPP防腐层，所述补口片的材质为马来酸酐接枝聚丙烯共聚物与聚丙烯的共混物，其共混比例为1:0～1:10，总体接枝率达到0.1wt％以上。
  18. 根据权利要求15所述的施工方法，其特征在于：补口片宽度方向中间有圆弧形凹槽，凹槽最深处为1.0～3.0mm，其宽度比补口部位环形焊道宽度小0～5mm。
  19. 根据权利要求18所述的施工方法，其特征在于：补口片宽度方向平直部分的长度与补口部位裸露的钢管的最小长度一致，平直部分两端为均匀减薄区，每端宽度在50～100mm；补口片长度方向平直部分最短比管道周长小60mm，最长比管道周长多100mm，平直部分两端同样为均匀减薄区，每端长度在30～60mm。
  20. 根据权利要求18所述的施工方法，其特征在于：补口片平直部分的厚度为两端预制防腐层厚度的100～150％。
  21. 根据权利要求15所述的施工方法，其特征在于：金属内衬板的外表面预先粘附有胶粘剂薄膜，厚度0.05～0.2mm，薄膜的一边与金属内衬板端部齐平，其余三边比重叠区域窄5～20mm。
  22. 根据权利要求21所述的施工方法，其特征在于：胶粘剂薄膜的材质为马来酸酐接枝聚乙烯/聚丙烯共聚物与聚乙烯/聚丙烯的共混物，其共混比例为1:0～1:10，总体接枝率达到0.1wt％以上。
  23. 根据权利要求15所述的施工方法，其特征在于：步骤f中，选用纤细的温度传感器，传感器测温点应放置在距离电热圈边缘至少50mm的内部区域。
  24. 根据权利要求15所述的施工方法，其特征在于：步骤h中，在第二阶段每隔1～5分钟可用测力扳手重新紧固钢箍，紧固时扭矩应达到规定初始扭矩的30％～90％。
  25. 根据权利要求15所述的施工方法，其特征在于：在不需要补口片与金属内衬板粘接的情况下，补口片采用双层结构，即在补口片的外层另外涂敷一层聚乙烯/聚丙烯，其厚度为0.1～0.5mm。26、一种新型补口结构，包括对接钢管、两端预制防腐层和补口部位,其特征在于，在补口部位钢管外壁设有环氧底漆层，所述环氧底漆层的外周围裹覆一层热塑性补口片，所述热塑性补口片全部覆盖环氧底漆层且与两端预制防腐层相搭接，在热塑性补口片的外周围设有金属内衬板，相邻各层之间牢固粘接，形成整体。
  26. 根据权利要求26所述的新型补口结构，其特征在于：补口部位钢管表面粗糙，锚纹深度达到10～100μm。
  27. 根据权利要求26所述的新型补口结构，其特征在于：所述环氧底漆层是无溶剂液体环氧涂料或环氧粉末涂料固化所形成，厚度大于50μm。
  28. 根据权利要求26所述的新型补口结构，其特征在于：热塑性补口片与两端预制防腐层及自身搭接处完全熔合成一体，所述热塑性补口片主体厚度为直管防 腐层厚度的100～150％，宽度比补口部位钢管的最小长度长100～200mm。
  29. 根据权利要求26所述的新型补口结构，其特征在于：钢管对接处的环形焊道包埋在热塑性补口片中，不向外凸起；金属内衬板包裹在热塑性补口片外成圆筒形状，头尾有20～120mm的重叠，宽度比热塑性补口片宽20～240mm，厚度为0.2～1.0mm。
  30. 根据权利要求30所述的新型补口结构，其特征在于：金属内衬板头尾的重叠部分由预先粘附在内层金属板外表面的胶粘剂薄膜粘接成一体。
  31. 根据权利要求31所述的新型补口结构，其特征在于：胶粘剂薄膜厚度0.05～0.2mm，材质为接枝聚乙烯/聚丙烯共聚物与聚乙烯/聚丙烯的混合物，其共混比例为1:0～1:7，总体接枝率为0.15wt％以上；接枝聚乙烯/聚丙烯共聚物是指马来酸酐、丙烯酸、甲基丙烯酸、衣康酸或缩水甘油酯与聚乙烯/聚丙烯的接枝共聚物。
  32. 根据权利要求26-31任一项所述的新型补口结构，其特征在于：热塑性补口片的材质是接枝聚乙烯/聚丙烯共聚物与聚乙烯/聚丙烯的混合物，其共混比例为1:0～1:7，总体接枝率为0.15wt％以上；所述接枝聚乙烯/聚丙烯共聚物是指马来酸酐、丙烯酸、甲基丙烯酸、衣康酸或缩水甘油酯与聚乙烯/聚丙烯的接枝共聚物。
  33. 根据权利要求26-31任一项所述的新型补口结构，其特征在于：金属内衬板的材质选自不锈钢、镀锌钢、镀锡钢、镀铝钢、镀镍钢、镀铬钢、纯铝、铝合金、纯铜或铜合金中的一种或几种。
PCT/CN2015/097217 2014-12-17 2015-12-12 一种补口机具及施工方法和新型补口结构 WO2016095766A1 (zh)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201410785138.7A CN104500920A (zh) 2014-12-17 2014-12-17 一种补口机具及施工方法
CN201410784731.XA CN104500919A (zh) 2014-12-17 2014-12-17 一种新型补口结构
CN201410785138.7 2014-12-17
CN201410784731.X 2014-12-17

Publications (1)

Publication Number Publication Date
WO2016095766A1 true WO2016095766A1 (zh) 2016-06-23

Family

ID=56125921

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2015/097217 WO2016095766A1 (zh) 2014-12-17 2015-12-12 一种补口机具及施工方法和新型补口结构

Country Status (1)

Country Link
WO (1) WO2016095766A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114950873A (zh) * 2022-06-19 2022-08-30 陕西华辰亚联石油工程有限公司 一种用于流体输送管道工厂化预制耐蚀合金内补口的防腐工艺

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009027686A1 (en) * 2007-08-29 2009-03-05 Pipeline Induction Heat Limited Improvements in coating pipes
CN101737587A (zh) * 2009-12-10 2010-06-16 金发科技股份有限公司 一种金属管道聚乙烯防腐层补口施工机具以及施工方法
CN203099209U (zh) * 2013-01-28 2013-07-31 江禹 燃气管道泄漏缝隙等压电热熔封堵机构
CN103925455A (zh) * 2014-04-01 2014-07-16 常州大学 一种水体管道补口保护方法和结构
CN203731006U (zh) * 2013-07-31 2014-07-23 四川四环管道防腐有限责任公司 埋地钢质管道焊口用补口复合片
CN104500916A (zh) * 2014-12-17 2015-04-08 四川金发科技发展有限公司 一种管道补口
CN104500919A (zh) * 2014-12-17 2015-04-08 四川金发科技发展有限公司 一种新型补口结构
CN104500920A (zh) * 2014-12-17 2015-04-08 四川金发科技发展有限公司 一种补口机具及施工方法
CN104500917A (zh) * 2014-12-17 2015-04-08 四川金发科技发展有限公司 一种管道补口方法
CN104633392A (zh) * 2014-12-17 2015-05-20 四川金发科技发展有限公司 一种补口方法
CN104633391A (zh) * 2014-12-17 2015-05-20 四川金发科技发展有限公司 一种补口方法
CN204459619U (zh) * 2014-12-17 2015-07-08 四川金发科技发展有限公司 一种新型补口结构
CN204477602U (zh) * 2014-12-17 2015-07-15 四川金发科技发展有限公司 一种补口机具
CN204477604U (zh) * 2014-12-17 2015-07-15 四川金发科技发展有限公司 一种补口机具
CN204477601U (zh) * 2014-12-17 2015-07-15 四川金发科技发展有限公司 一种管道补口

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009027686A1 (en) * 2007-08-29 2009-03-05 Pipeline Induction Heat Limited Improvements in coating pipes
CN101737587A (zh) * 2009-12-10 2010-06-16 金发科技股份有限公司 一种金属管道聚乙烯防腐层补口施工机具以及施工方法
CN203099209U (zh) * 2013-01-28 2013-07-31 江禹 燃气管道泄漏缝隙等压电热熔封堵机构
CN203731006U (zh) * 2013-07-31 2014-07-23 四川四环管道防腐有限责任公司 埋地钢质管道焊口用补口复合片
CN103925455A (zh) * 2014-04-01 2014-07-16 常州大学 一种水体管道补口保护方法和结构
CN104500919A (zh) * 2014-12-17 2015-04-08 四川金发科技发展有限公司 一种新型补口结构
CN104500916A (zh) * 2014-12-17 2015-04-08 四川金发科技发展有限公司 一种管道补口
CN104500920A (zh) * 2014-12-17 2015-04-08 四川金发科技发展有限公司 一种补口机具及施工方法
CN104500917A (zh) * 2014-12-17 2015-04-08 四川金发科技发展有限公司 一种管道补口方法
CN104633392A (zh) * 2014-12-17 2015-05-20 四川金发科技发展有限公司 一种补口方法
CN104633391A (zh) * 2014-12-17 2015-05-20 四川金发科技发展有限公司 一种补口方法
CN204459619U (zh) * 2014-12-17 2015-07-08 四川金发科技发展有限公司 一种新型补口结构
CN204477602U (zh) * 2014-12-17 2015-07-15 四川金发科技发展有限公司 一种补口机具
CN204477604U (zh) * 2014-12-17 2015-07-15 四川金发科技发展有限公司 一种补口机具
CN204477601U (zh) * 2014-12-17 2015-07-15 四川金发科技发展有限公司 一种管道补口

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114950873A (zh) * 2022-06-19 2022-08-30 陕西华辰亚联石油工程有限公司 一种用于流体输送管道工厂化预制耐蚀合金内补口的防腐工艺
CN114950873B (zh) * 2022-06-19 2023-01-31 陕西华辰亚联石油工程有限公司 一种用于流体输送管道工厂化预制耐蚀合金内补口的防腐工艺

Similar Documents

Publication Publication Date Title
Thompson et al. Review of pipe line coating systems from an operators perspective
CN111471408B (zh) 一种聚乙烯复合带及其制备、补口工艺方法和用途
CN201106735Y (zh) 无溶剂环氧涂料补口的三层聚乙烯防腐管
CN104633391B (zh) 一种补口方法
JP6738605B2 (ja) プラスチックライニング鋼管の溶接部防食方法及び熱収縮性防食シート用押え粘着テープ
CN104500919A (zh) 一种新型补口结构
WO2016095766A1 (zh) 一种补口机具及施工方法和新型补口结构
CN104500916A (zh) 一种管道补口
WO2016095765A1 (zh) 一种管道补口及其管道补口方法
CN103062575A (zh) 高寒地区输油气埋地保温管道补口工艺
CN204477604U (zh) 一种补口机具
RU2566786C2 (ru) Способ восстановления трубопроводного покрытия
CN104633392B (zh) 一种补口方法
CN204459619U (zh) 一种新型补口结构
RU2398155C2 (ru) Способ противокоррозионной изоляции сварного стыка трубопровода и устройство для его осуществления
CN204477602U (zh) 一种补口机具
CN104500920A (zh) 一种补口机具及施工方法
CN204477601U (zh) 一种管道补口
CN110486573B (zh) 钢制异形管件表面防腐结构构建方法
RU2037731C1 (ru) Способ ремонта трубопровода с комбинированным антикоррозионным покрытием
CN219828173U (zh) 一种管道补口异型带
WO1990009542A1 (en) Method of corrosion protection at pipe junctions
RU2415332C1 (ru) Способ нанесения защитного покрытия на трубы
CN104500917A (zh) 一种管道补口方法
RU2527282C2 (ru) Способ наружной изоляции соединений трубопроводов из стальных труб с наружным покрытием

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15869273

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15869273

Country of ref document: EP

Kind code of ref document: A1