CN210592336U - Liquefied natural gas ship-borne catamaran storage tank - Google Patents
Liquefied natural gas ship-borne catamaran storage tank Download PDFInfo
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- CN210592336U CN210592336U CN201921156337.6U CN201921156337U CN210592336U CN 210592336 U CN210592336 U CN 210592336U CN 201921156337 U CN201921156337 U CN 201921156337U CN 210592336 U CN210592336 U CN 210592336U
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Abstract
The utility model discloses a liquefied natural gas ship-borne double-body storage tank, including two barrels and set up in the bay board between the barrel, the barrel includes left head, right head, and set up in first shell ring, second shell ring, third shell ring, fourth shell ring and the fifth shell ring between the left head and the right head; the left end socket, the first shell ring, the second shell ring, the third shell ring, the fourth shell ring, the fifth shell ring and the right end socket are sequentially connected in a welding mode. The storage device has the advantages of reasonable structure, convenience in manufacturing, stability and reliability in the whole and large storage capacity.
Description
Technical Field
The utility model relates to a shipbuilding technical field, concretely relates to shipborne storage tank.
Background
Liquefied Natural Gas (LNG) is gaining favor as a green energy source, and in recent years, the global production and trade of LNG has become active, and LNG has become a scarce clean resource and is becoming a new hot spot in the world oil and gas industry. And the LNG can be conveyed by two modes, namely a pipeline and a transport ship. With the wide application of natural gas, the demand of LNG carriers is very strong, and LNG carriers are special ships for transporting liquefied natural gas at a low temperature of minus 164 ℃, are internationally recognized products of "three highs", are marine super-freezing vehicles, are likened to "pearl on the crown" of the world shipbuilding industry, have high added value of the products and large construction difficulty, and can be constructed only by 13 shipyards in a few countries of china, the united states, japan, korea and europe. Thus, unlike ordinary chemical storage tanks, LNG shipborne storage tanks are built with a large number of special requirements, requiring a large number of sophisticated technical supports.
Particularly, the large-volume LNG shipborne storage tank has extremely high difficulty in the processes of manufacturing, assembling, transporting and the like. For example 30000m, which the applicant intends to manufacture3The LNG shipborne storage tank adopts a C-shaped independent spherical storage tank which is formed by 1 4500m3Mono-block pot, 3 stands 8500m3The double-body tank and 1 deck tank. The production difficulty is mainly embodied in the following aspects: 1. the LNG shipborne storage tank is large in size and large in occupied construction space, and how to design the storage tank in a split manner is to reasonably plan the construction space and meet the construction requirements, so that the problem to be solved urgently is solved; 2. considering that-162 ℃ or even lower temperature environment is required for transportation of liquefied natural gas. Therefore, X7Ni9 steel (commonly called 9 nickel steel) is adopted for manufacturing the LNG shipborne storage tank, and the steel has the characteristics of high purity, high strength, excellent low-temperature toughness and the like, but is easily scratched by other steel to cause a notch effect; material rebound is easy to occur in the pressing process; cracks and magnetic blow-off phenomena are easy to occur in the welding process, so how to avoid the situations is an urgent problem to be solved; 3. the storage tank is the most important, and the most difficult construction point is the precision control of manufacturing and installation, and considering the difficult problems of different thicknesses of plates of the storage tank, large difference of the thicknesses of the plates, extremely high requirement on cutting precision of components of the storage tank, heavy tonnage of the storage tank during assembling and hoisting, and the like, how to control the deformation of the storage tank in the manufacturing and installation process becomes the biggest problem; 4. because the critical point of the natural gas liquefaction temperature is-162 ℃, the natural gas production place is far away from the consumption place, the low-temperature environment in the storage tank needs to be ensured for a long time during the shipping, how to maintain the low temperature in the tank for a long time is still difficult, the application of the heat insulation material is a key, and the excellent heat insulation material is excellentThe liquefied natural gas can be greatly evaporated in the transportation process, and the personal safety of the workers on the whole ship can be ensured, so that the heat insulation system is one of the great problems in the construction of the LNG ship and has very high requirements and regulations on structural design, construction process and construction materials. Wherein, the double-body storage tank has more complicated structure and is particularly difficult to design and produce due to larger volume.
Therefore, a problem to be solved by those skilled in the art is how to design a large LNG ship-mounted storage tank, especially design and production of a catamaran tank to meet the cargo carrying requirement of a large LNG ship.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a rational in infrastructure, it is convenient to make, and whole reliable and stable, and the liquefied natural gas ship-borne binary storage tank that storage capacity is big.
Another object of the present invention is to provide a method for manufacturing the above tank, which has high production efficiency, high manufacturing accuracy and safe manufacturing process.
In order to achieve the above purpose, the utility model adopts the technical scheme that: the utility model provides a liquefied natural gas ship-borne catamaran storage tank which characterized in that: the device comprises two cylinders and a compartment plate arranged between the cylinders, wherein each cylinder comprises a left end socket, a right end socket, a first cylinder section, a second cylinder section, a third cylinder section, a fourth cylinder section and a fifth cylinder section, and the first cylinder section, the second cylinder section, the third cylinder section, the fourth cylinder section and the fifth cylinder section are arranged between the left end socket and the right end socket; the left end socket, the first shell ring, the second shell ring, the third shell ring, the fourth shell ring, the fifth shell ring and the right end socket are sequentially welded and connected;
a cylinder shroud plate is arranged on the outer sides of the first cylinder section and the fifth cylinder section in a surrounding mode and is suitable for being installed on a saddle; reinforcing rings are arranged on the inner sides of the first cylindrical shell section and the fifth cylindrical shell section, and vacuum rings are arranged on the inner sides of the second cylindrical shell section, the third cylindrical shell section and the fourth cylindrical shell section;
the left seal head and the right seal head respectively comprise a temperate zone plate, a polar edge plate and a polar middle plate; the temperature band plate is provided with a plurality of end-to-end plates along the circumferential direction, the number of the polar side plates is two, the polar side plates are arranged at the top of the temperature band plate, and the number of the polar middle plates is one, and the polar middle plates are arranged between the two polar middle plates; the temperature zone plate, the polar edge plate and the polar middle plate and the temperature zone plates are connected by welding, and the temperature zone plate, the polar edge plate and the polar middle plate are connected to form a hemispherical structure;
the first shell ring, the second shell ring, the third shell ring, the fourth shell ring and the fifth shell ring all comprise a plurality of shell ring plates, the shell ring plates are of arc-shaped structures, and the plurality of shell ring plates are connected in an end-to-end mode through welding and are connected to form a circular ring-shaped structure.
Preferably, one group of the temperature zone plates is sixteen, and one group of the barrel section plates is three.
A method for manufacturing a catamaran tank on a liquefied natural gas ship is characterized by comprising the following steps: the construction method also comprises the following steps between construction preparation and delivery acceptance in sequence:
s1: pressing the shell plate; the shell plate comprises a compartment plate, a barrel joint plate, a temperature zone plate, a polar middle plate, a barrel cover plate, a reinforcing ring and a vacuum ring; the shells are all formed by cutting and pressing an X7Ni9 steel plate;
s2: assembling and welding shell plates; assembling and welding the shell ring plates to form a first shell ring, a second shell ring, a third shell ring, a fourth shell ring and a fifth shell ring, and assembling and welding the temperature zone plates, the polar side plates and the polar middle plates to form a left end socket and a right end socket; welding the cylinder body shroud plate to the outer sides of the first cylinder section and the fifth cylinder section, welding the reinforcing ring to the inner sides of the first cylinder section and the fifth cylinder section, and welding the vacuum ring to the inner sides of the second cylinder section, the third cylinder section and the fourth cylinder section;
s3: small folding of the segments; welding the two first barrel sections to form an infinite structure, inserting the partition plate between the first barrel sections at two sides and welding and fixing, and then respectively hoisting the two left end enclosures on two sides of the partition plate and stacking the two left end enclosures on the first barrel sections for welding and fixing, thereby assembling to form a section I of the tank body; welding the two second cylindrical sections to form an infinite structure, inserting the partition plate between the second cylindrical sections at two sides and welding and fixing the second cylindrical sections, respectively hoisting the two third cylindrical sections at two sides of the partition plate and stacking the third cylindrical sections on the second cylindrical sections for welding and fixing, and finally respectively installing the two fourth cylindrical sections at two sides of the partition plate and stacking the fourth cylindrical sections on the third cylindrical sections for welding and fixing, thereby assembling to form a section II of the tank body; welding the two fifth cylindrical sections to form an infinite structure, inserting the partition plate between the fifth cylindrical sections at two sides and welding and fixing, and then respectively hoisting the two right end sockets on two sides of the partition plate and stacking the two right end sockets on the fifth cylindrical sections for welding and fixing, thereby assembling to form a III section of the tank body;
s4: the tank body is folded greatly; and welding and fixing the first section of the tank body, the second section of the tank body and the third section of the tank body in sequence to form the double-body storage tank.
The step S4 is followed by the following steps:
s5: nondestructive detection of the tank body; the detection method comprises the steps of radiographic inspection, ultrasonic inspection, coloring and visual inspection;
s6: carrying out hydrostatic test; the hydrostatic test is carried out after the tank body is qualified by nondestructive testing;
s7: performing air tightness test; the air tightness test is carried out after the water pressure test is qualified, the rust removal of the inner wall of the storage tank is qualified, and the storage tank is hoisted and loaded onto a ship.
Further, in step S1, the barrel joint plate is formed by rolling, and the temperate zone plate, the pole edge plate and the pole middle plate are formed by die pressing and cold working.
Further specifically, in the step S2, before the tube section plates are assembled, a tube section plate assembling jig frame needs to be erected, and the erection of the tube section plate assembling jig frame includes the following steps: drawing a lofting line of a cylindrical section on a terrace and a laid steel plate, then manufacturing a horizontal jig frame consisting of steel plates on the terrace, and keeping the top ends of jig frame templates on the same horizontal plane by using a laser theodolite; and the single shell ring is formed by splicing three shell ring plates, and the three shell ring plates are sequentially hoisted to the fixed positions on the shell ring plate splicing jig frame and are connected in a welding manner.
Further specifically, in the step S2, a head assembling jig frame needs to be erected before assembling the left head and the right head, and the erection of the head assembling jig frame includes the following steps:
s21: laying steel plates and leveling;
s21: drawing two mutually perpendicular center lines on the steel plate, and drawing a reserved line parallel to the center line in the 0-degree direction after the center line deviates rightwards; the distance between the reserved line and the 0-degree central line is slightly larger than the distance between the center of the seal head and the cabin separation plate;
s22: drawing an inner arc line and an outer arc line respectively by taking the intersection point of the central lines as the circle center; the diameter of the inner arc line is equal to the inner diameter of the temperate zone plate, and the diameter of the outer arc line is equal to the outer diameter of the temperate zone plate;
s23: mounting a moulding bed template at the position where the temperature zone plates are connected;
after the erection of the seal head assembling jig frame is completed, assembling of a left seal head or a right seal head is carried out, wherein the assembling of the seal head comprises the following steps:
s24: firstly hoisting a temperate zone plate at the 90-degree position; drawing the vertical central line of the selected 90-degree temperate zone plate, then hanging the temperate zone plate on a jig frame in the 90-degree direction, and enabling a line weight hung on the vertical central line of the temperate zone plate to coincide with the intersection point of an outer circular arc line on the ground and the central line in the 90-degree direction before the temperature zone plate is positioned;
s25: after the first temperate zone plate is hoisted, hoisting is started to two sides in sequence; after the second temperate zone plate is hoisted on the jig frame, adjusting the gap and the misalignment between the second temperate zone plate and the first temperate zone plate, adjusting the thicknesses of the two temperate zone plates, and beginning to tack the welding seam between the two temperate zone plates; then hoisting all the temperate zone plates in sequence according to the method;
s26: after the temperature belt plate is completely hoisted, drawing positioning lines of the two polar side plates at the edge of the upper slope opening of the temperature belt plate, and then sequentially hoisting the two polar side plates;
s27: after the two pole side plates are fixed, starting to hoist the pole middle plate; a support column is erected in advance under the middle plate for supporting the middle plate and preventing the end socket from collapsing and deforming;
s28: after the end socket is integrally assembled, measuring the outer circumference of the lowermost end of the end socket to ensure that the outer circumference of the lower end of the end socket is within an allowable error range;
s29: after the size is determined, the end socket is started to find a seam; the seam finding adopts a cutter handle, a wedge, a clamp and a fixing block, and the fixing block and the cutter handle are made of steel materials the same as those of the end socket; the tool is adopted to find the seams and adjust the gaps and the staggered edges among the temperature zone plates, the polar edge plates and the polar middle plates;
s30: finding and adjusting the seam, and performing integral tack welding on a small slope of the seam after quality inspection and confirmation;
s31: after the end socket assembly and spot fixation are completed, starting drawing cutting lines of the end socket; aligning the reserved line by using a theodolite, dotting and drawing lines at two ends of the seal head by using the theodolite respectively, and connecting the dots into a line after dotting;
s32: performing rough cutting at a distance from the outside of the cutting line before the welding of the end socket is started, and discharging smoke generated by welding in the end socket; after welding, continuously dotting by using a theodolite and carrying out fine cutting;
s33: after the end socket is cut, reinforcing the end socket by adopting a false bay at the cutting opening, and removing the false bay after the end socket and the bulkhead are welded;
after the hoisting of the temperature zone plate is completed, a seal head scaffold is set up, and the seal head scaffold is used for assembling, finding and welding.
More specifically, the tank body folding in step S4 is assembled by assembling from one end of the storage tank to the other end, and includes the following steps:
s41: firstly, placing a bracket on a position of a mounting center positioning line;
s42: adjusting the position of the bracket, and then hanging the first section of the tank body on the bracket which is put in advance;
s43: then, hoisting the second section of the tank body to a designed position, adjusting the position of a circular seam between the second section of the tank body and the first section of the tank body, connecting the second section of the tank body with a fixture, and preliminarily adjusting the second section of the tank body to the right position;
s44: then hoisting the third section of the tank body to the bracket, and butting the third section of the tank body with the second section of the tank body;
s45: after the third section of the tank body is in place, connecting the second section of the tank body with a fixture, and then preliminarily adjusting the annular seam gap, the staggered edge and the angular deformation;
s46: after the gap, the misalignment, the angular deformation, the straightness and the ellipticity are adjusted to meet the requirements, point fixation is carried out;
s47: and after the point fixation is finished and the inspection is qualified, welding is carried out.
More specifically, before the hydrostatic test in step S5, a hydrostatic test preparation operation is required, where the hydrostatic test preparation operation includes the following steps: after the storage tank is welded and flaw detection is finished, cleaning up the magazines in the tank; laying a steel plate with the thickness of more than 40mm below each bracket to increase the stress area, and adding temporary cement piers and wood wedges for supporting other parts; the test medium is industrial clean water; three pressure gauges with the measuring range of 1MPa and the precision of 2.5 grade are arranged at the top and the bottom of the storage tank, and the pressure reading during the test is based on the reading of the pressure gauge at the top of the storage tank;
the hydrostatic test comprises the following contents: when injecting industrial clean water into the storage tank, the top of the storage tank is provided with an exhaust port so as to exhaust the air in the storage tank; after the test is started, the pressure should be slowly increased, and the pressure increasing speed is less than 0.05 MPa/min; when the pressure is increased to 50% of the test pressure, maintaining the pressure for at least 20min for inspection; if no abnormal phenomena such as leakage, abnormal noise and obvious deformation occur, the pressure is raised to the design pressure; detecting again, if no abnormal phenomena such as leakage, abnormal sound and obvious deformation occur, continuously increasing to the test pressure, and maintaining the pressure for 1.6 hours; checking all welding seams and welding parts of the storage tank, and after confirming that no abnormal phenomena such as leakage, abnormal noise, obvious deformation and the like exist, reducing the pressure to 80% of the test pressure, checking all welding seams and welding parts of the storage tank for leakage, and slowly reducing the pressure after confirming that no leakage exists; the pressure remains constant during the examination; if leakage and abnormal deformation are found in the test steps, the pressure test is stopped immediately; after the leakage needs to be repaired, the hydrostatic test can be carried out again after the flaw detection is qualified; knocking and colliding the storage tank are forbidden in the pressure test process, and non-operators cannot approach the periphery of the storage tank; after the hydrostatic test is finished, pressure is discharged to 0, the top opening is opened, the two submersible pumps are hung to the bottom of the storage tank to pump water, and after water is drained, the interior of the storage tank is dried by compressed air.
More specifically, before the air-tightness test in step S5, an air-tightness test preparation operation is performed, where the air-tightness test preparation operation includes the following steps: the gas used in the test is dry clean air, and a high-pressure air compressor or a high-pressure air pump vehicle is adopted for pressurization during the test; before the test, a pressure gauge with the measuring range of 1MPa and the precision of 2.5 grades is respectively arranged at the top and the bottom of the storage tank, and the pressure reading during the test is based on the reading of the pressure gauge at the top of the storage tank; during the test, the change of the environmental temperature is noticed at any time, and the reading of the pressure gauge is monitored to prevent the overpressure phenomenon;
the air-tightness test comprises the following contents: during the test, after the pressure is slowly increased to 50% of the test pressure, the pressure is maintained for 10 minutes; all welding seams and welding parts of the storage tank are subjected to primary inspection, and if no leakage exists, the pressure can be continuously increased; after the pressure is increased to the test pressure, the pressure is maintained for 30 minutes; in the pressure maintaining process, all welding seams and welding parts of the storage tank are coated with soapy water for inspection, and the storage tank is qualified in terms of no leakage; if leakage occurs, the air tightness test is stopped immediately; after the leakage needs to be repaired, the air tightness test can be carried out again after the leakage is inspected and qualified; and after the air tightness test is qualified, opening an exhaust valve at the top of the storage tank, and keeping the pressure relief to be slowly carried out.
Compared with the prior art, the utility model has the advantages of: the double-body storage tank has huge volume and is formed by intersecting two cylinders, so the manufacturing difficulty is higher. The scheme is manufactured through reasonable segmentation and splitting, so that the manufacturing can be performed by using the existing tool equipment in a limited space. The double-body storage tank manufactured by the scheme is subjected to a strict gas-liquid pressure test, so that the delivery quality of the double-body storage tank is ensured.
Drawings
Fig. 1 is a top view of a preferred embodiment according to the present invention;
fig. 2 is a front view of a preferred embodiment according to the present invention;
fig. 3 is a left side view of a preferred embodiment according to the present invention;
fig. 4 is a process flow diagram according to a preferred embodiment of the present invention;
fig. 5 is a schematic diagram in sections according to a preferred embodiment of the invention;
FIG. 6 is a top view of a shell ring plate assembly jig frame according to a preferred embodiment of the present invention;
fig. 7 is a cross-sectional view taken along a-a in fig. 6, in accordance with a preferred embodiment of the present invention;
fig. 8 is a cross-sectional view taken along the direction B-B in fig. 6, in accordance with a preferred embodiment of the present invention;
fig. 9 is a top view of a head-mounted jig frame according to a preferred embodiment of the present invention;
fig. 10 is a side view of a head-mounted jig frame according to a preferred embodiment of the present invention;
fig. 11 is a schematic illustration of the construction of a dummy bay according to a preferred embodiment of the invention;
fig. 12 is a schematic structural view of a closed-end scaffolding according to a preferred embodiment of the present invention;
FIG. 13 is a schematic view of a preferred embodiment of the present invention showing the flow of the first and third sections of the can body when they are closed;
FIG. 14 is a schematic view of a preferred embodiment of the process of the minor closure of the second section of the can body according to the present invention;
fig. 15 is a schematic flow diagram of the closing up according to a preferred embodiment of the present invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
As shown in fig. 1 to 3, a preferred embodiment of the present invention includes two barrels 100 and a bulkhead 200 disposed between the barrels 100, wherein the barrel 100 includes a left end socket 1, a right end socket 2, and a first barrel section 3, a second barrel section 4, a third barrel section 5, a fourth barrel section 6 and a fifth barrel section 7 disposed between the left end socket 1 and the right end socket 2; the left end socket 1, the first cylindrical shell section 3, the second cylindrical shell section 4, the third cylindrical shell section 5, the fourth cylindrical shell section 6, the fifth cylindrical shell section 7 and the right end socket 2 are sequentially connected in a welding mode.
The outer sides of the first shell ring 3 and the fifth shell ring 7 are provided with a barrel shroud plate 8 in a surrounding mode, and the barrel shroud plate 8 is suitable for being installed on the saddle; the inner sides of the first cylinder section 3 and the fifth cylinder section 7 are provided with reinforcing rings, and the inner sides of the second cylinder section 4, the third cylinder section 5 and the fourth cylinder section 6 are provided with vacuum rings. It should be noted that the reinforcing ring and the vacuum ring are arranged in the conventional structure and are located inside the cylinder body, and therefore are not shown in the attached drawings.
The left end enclosure 1 and the right end enclosure 2 are symmetrical in structure and respectively comprise a temperate zone plate 11, a polar edge plate 12 and a polar middle plate 13; the temperature zone plate 11 is provided with sixteen temperature zone plates which are connected end to end along the circumferential direction, the two polar edge plates 12 are arranged at the top of the temperature zone plate, and the one polar middle plate 13 is arranged between the two polar middle plates 12; the temperature zone plate 11, the pole side plate 12 and the pole middle plate 13 are connected through welding, and the temperature zone plate 11, the pole side plate 12 and the pole middle plate 13 are connected to form a hemispherical structure.
The first barrel section 3, the second barrel section 4, the third barrel section 5, the fourth barrel section 6 and the fifth barrel section 7 respectively comprise three barrel section plates 31, the barrel section plates 31 are of circular arc-shaped structures, and the barrel section plates 31 are connected in an end-to-end mode through welding and are connected to form a circular ring-shaped structure.
As shown in fig. 4 to 15, the method for manufacturing the lng ship-mounted catamaran tank further includes the following steps between the preparation of construction and the acceptance of delivery:
s1: pressing the shell plate; the shell plate comprises a compartment plate, a barrel joint plate, a temperature zone plate, a polar middle plate, a barrel cover plate, a reinforcing ring and a vacuum ring; the above cases were each formed by cutting and pressing an X7Ni9 steel plate.
S2: assembling and welding shell plates; assembling and welding the shell ring plates to form a first shell ring, a second shell ring, a third shell ring, a fourth shell ring and a fifth shell ring, and assembling and welding the temperature zone plates, the polar side plates and the polar middle plates to form a left end socket and a right end socket; and welding the cylinder body shroud plate on the outer sides of the first cylinder section and the fifth cylinder section, welding the reinforcing ring on the inner sides of the first cylinder section and the fifth cylinder section, and welding the vacuum ring on the inner sides of the second cylinder section, the third cylinder section and the fourth cylinder section.
S3: small folding of the segments; welding the two first barrel sections to form an infinite structure, inserting the partition plate between the first barrel sections at two sides and welding and fixing, and then respectively hoisting the two left end enclosures on two sides of the partition plate and stacking the two left end enclosures on the first barrel sections for welding and fixing, thereby assembling to form a section I of the tank body; welding the two second cylindrical sections to form an infinite structure, inserting the partition plate between the second cylindrical sections at two sides and welding and fixing the second cylindrical sections, respectively hoisting the two third cylindrical sections at two sides of the partition plate and stacking the third cylindrical sections on the second cylindrical sections for welding and fixing, and finally respectively installing the two fourth cylindrical sections at two sides of the partition plate and stacking the fourth cylindrical sections on the third cylindrical sections for welding and fixing, thereby assembling to form a section II of the tank body; welding the two fifth cylindrical sections to form an infinite structure, inserting the partition plate between the fifth cylindrical sections at two sides and welding and fixing the fifth cylindrical sections, and then respectively hoisting the two right end enclosures on two sides of the partition plate and stacking the two right end enclosures on the fifth cylindrical sections for welding and fixing, thereby assembling and forming the III sections of the tank body. As shown in fig. 13 and 14, a specific flow of segment folding is shown.
S4: the tank body is folded greatly; and welding and fixing the first section of the tank body, the second section of the tank body and the third section of the tank body in sequence to form the double-body storage tank.
S5: nondestructive detection of the tank body; the detection method comprises the steps of radiographic inspection, ultrasonic inspection, coloring and visual inspection.
S6: carrying out hydrostatic test; and the hydrostatic test is carried out after the nondestructive detection of the tank body is qualified.
S7: performing air tightness test; the air tightness test is carried out after the water pressure test is qualified, the rust removal of the inner wall of the storage tank is qualified, and the storage tank is hoisted and loaded onto a ship.
Wherein in step S2, before the shell ring plates are assembled, a shell ring plate assembling jig frame 9 needs to be erected, and the erection of the shell ring plate assembling jig frame comprises the following steps: drawing a lofting line 10 of a cylinder section on a terrace and a laid steel plate, then manufacturing a horizontal jig frame consisting of steel plates on the terrace, and keeping the top ends of jig frame templates on the same horizontal plane by using a laser theodolite; and the single shell ring is formed by splicing three shell ring plates, and the three shell ring plates are sequentially hoisted to the fixed positions on the shell ring plate splicing jig frame and are connected in a welding manner. With particular reference to figures 6, 7 and 8.
In the step S2, a head assembling jig frame 11 needs to be erected before assembling the left head and the right head, and the erection of the head assembling jig frame 11 includes the following steps:
s21: laying steel plates and leveling;
s21: drawing two mutually perpendicular center lines 12 on the steel plate, and drawing a reserved line 13 parallel to the center line in the 0-degree direction after the center line is deviated rightwards; the distance between the reserved line and the 0-degree central line is slightly larger than the distance between the center of the seal head and the cabin separation plate;
s22: drawing an inner arc line 14 and an outer arc line 15 respectively by taking the intersection point of the central lines as the circle center; the diameter of the inner arc line is equal to the inner diameter of the temperate zone plate, and the diameter of the outer arc line is equal to the outer diameter of the temperate zone plate;
s23: and a moulding bed template is arranged at the position where the temperature zone plates are connected. As shown in fig. 9 and 10, a concrete structure of the head assembling jig frame is shown.
After the erection of the seal head assembling jig frame is completed, assembling of a left seal head or a right seal head is carried out, wherein the assembling of the seal head comprises the following steps:
s24: firstly hoisting a temperate zone plate at the 90-degree position; drawing the vertical central line of the selected 90-degree temperate zone plate, then hanging the temperate zone plate on a jig frame in the 90-degree direction, and enabling a line weight hung on the vertical central line of the temperate zone plate to coincide with the intersection point of an outer circular arc line on the ground and the central line in the 90-degree direction before the temperature zone plate is positioned;
s25: after the first temperate zone plate is hoisted, hoisting is started to two sides in sequence; after the second temperate zone plate is hoisted on the jig frame, adjusting the gap and the misalignment between the second temperate zone plate and the first temperate zone plate, adjusting the thicknesses of the two temperate zone plates, and beginning to tack the welding seam between the two temperate zone plates; then hoisting all the temperate zone plates in sequence according to the method;
s26: after the temperature belt plate is completely hoisted, drawing positioning lines of the two polar side plates at the edge of the upper slope opening of the temperature belt plate, and then sequentially hoisting the two polar side plates;
s27: after the two pole side plates are fixed, starting to hoist the pole middle plate; a support column is erected in advance under the middle plate for supporting the middle plate and preventing the end socket from collapsing and deforming;
s28: after the end socket is integrally assembled, measuring the outer circumference of the lowermost end of the end socket to ensure that the outer circumference of the lower end of the end socket is within an allowable error range;
s29: after the size is determined, the end socket is started to find a seam; the seam finding adopts a cutter handle, a wedge, a clamp and a fixing block, and the fixing block and the cutter handle are made of steel materials the same as those of the end socket; the tool is adopted to find the seams and adjust the gaps and the staggered edges among the temperature zone plates, the polar edge plates and the polar middle plates;
s30: finding and adjusting the seam, and performing integral tack welding on a small slope of the seam after quality inspection and confirmation;
s31: after the end socket assembly and spot fixation are completed, starting drawing cutting lines of the end socket; aligning the reserved line by using a theodolite, dotting and drawing lines at two ends of the seal head by using the theodolite respectively, and connecting the dots into a line after dotting;
s32: performing rough cutting at a distance from the outside of the cutting line before the welding of the end socket is started, and discharging smoke generated by welding in the end socket; after welding, continuously dotting by using a theodolite and carrying out fine cutting;
s33: after the end socket is cut, a false bay 16 is adopted at the cutting opening to strengthen the end socket, and the false bay is removed after the end socket and the bulkhead are welded. As shown in fig. 11, a specific configuration of the cofferdam is shown.
After the hoisting of the temperature zone plate is completed, a seal head scaffold 17 is set up, and the seal head scaffold is used for assembling, finding and welding. As shown in fig. 12, a concrete structure of the scaffolding with the sealing head is shown.
The tank body folding in the step S4 is assembled in a way of being assembled from one end of the storage tank to the other end, and the method comprises the following steps:
s41: firstly, placing a bracket on a position of a mounting center positioning line;
s42: adjusting the position of the bracket, and then hanging the first section of the tank body on the bracket which is put in advance;
s43: then, hoisting the second section of the tank body to a designed position, adjusting the position of a circular seam between the second section of the tank body and the first section of the tank body, connecting the second section of the tank body with a fixture, and preliminarily adjusting the second section of the tank body to the right position;
s44: then hoisting the third section of the tank body to the bracket, and butting the third section of the tank body with the second section of the tank body;
s45: after the third section of the tank body is in place, connecting the second section of the tank body with a fixture, and then preliminarily adjusting the annular seam gap, the staggered edge and the angular deformation;
s46: after the gap, the misalignment, the angular deformation, the straightness and the ellipticity are adjusted to meet the requirements, point fixation is carried out;
s47: and after the point fixation is finished and the inspection is qualified, welding is carried out. As shown in FIG. 15, the detailed flow of tank body large closing is shown.
Before the hydrostatic test of step S5, a hydrostatic test preparation work is required, and the hydrostatic test preparation work includes the following contents: after the storage tank is welded and flaw detection is finished, cleaning up the magazines in the tank; laying a steel plate with the thickness of more than 40mm below each bracket to increase the stress area, and adding temporary cement piers and wood wedges for supporting other parts; the test medium is industrial clean water; three pressure gauges with the measuring range of 1MPa and the precision of 2.5 grades are arranged at the top and the bottom of the storage tank, and the pressure reading during the test is based on the reading of the pressure gauge at the top of the storage tank.
The hydrostatic test comprises the following contents: when injecting industrial clean water into the storage tank, the top of the storage tank is provided with an exhaust port so as to exhaust the air in the storage tank; after the test is started, the pressure should be slowly increased, and the pressure increasing speed is less than 0.05 MPa/min; when the pressure is increased to 50% of the test pressure, maintaining the pressure for at least 20min for inspection; if no abnormal phenomena such as leakage, abnormal noise and obvious deformation occur, the pressure is raised to the design pressure; detecting again, if no abnormal phenomena such as leakage, abnormal sound and obvious deformation occur, continuously increasing to the test pressure, and maintaining the pressure for 1.6 hours; checking all welding seams and welding parts of the storage tank, and after confirming that no abnormal phenomena such as leakage, abnormal noise, obvious deformation and the like exist, reducing the pressure to 80% of the test pressure, checking all welding seams and welding parts of the storage tank for leakage, and slowly reducing the pressure after confirming that no leakage exists; the pressure remains constant during the examination; if leakage and abnormal deformation are found in the test steps, the pressure test is stopped immediately; after the leakage needs to be repaired, the hydrostatic test can be carried out again after the flaw detection is qualified; knocking and colliding the storage tank are forbidden in the pressure test process, and non-operators cannot approach the periphery of the storage tank; after the hydrostatic test is finished, pressure is discharged to 0, the top opening is opened, the two submersible pumps are hung to the bottom of the storage tank to pump water, and after water is drained, the interior of the storage tank is dried by compressed air.
Before the air-tightness test in step S5, an air-tightness test preparation is required, which includes the following steps: the gas used in the test is dry clean air, and a high-pressure air compressor or a high-pressure air pump vehicle is adopted for pressurization during the test; before the test, a pressure gauge with the measuring range of 1MPa and the precision of 2.5 grades is respectively arranged at the top and the bottom of the storage tank, and the pressure reading during the test is based on the reading of the pressure gauge at the top of the storage tank; during the test, the change of the environmental temperature is noticed at any time, and the reading of the pressure gauge is monitored to prevent the overpressure phenomenon.
The air-tightness test comprises the following contents: during the test, after the pressure is slowly increased to 50% of the test pressure, the pressure is maintained for 10 minutes; all welding seams and welding parts of the storage tank are subjected to primary inspection, and if no leakage exists, the pressure can be continuously increased; after the pressure is increased to the test pressure, the pressure is maintained for 30 minutes; in the pressure maintaining process, all welding seams and welding parts of the storage tank are coated with soapy water for inspection, and the storage tank is qualified in terms of no leakage; if leakage occurs, the air tightness test is stopped immediately; after the leakage needs to be repaired, the air tightness test can be carried out again after the leakage is inspected and qualified; and after the air tightness test is qualified, opening an exhaust valve at the top of the storage tank, and keeping the pressure relief to be slowly carried out.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the principles of the present invention may be applied to any other embodiment without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. The utility model provides a liquefied natural gas ship-borne catamaran storage tank which characterized in that: the device comprises two cylinders and a compartment plate arranged between the cylinders, wherein each cylinder comprises a left end socket, a right end socket, a first cylinder section, a second cylinder section, a third cylinder section, a fourth cylinder section and a fifth cylinder section, and the first cylinder section, the second cylinder section, the third cylinder section, the fourth cylinder section and the fifth cylinder section are arranged between the left end socket and the right end socket; the left end socket, the first shell ring, the second shell ring, the third shell ring, the fourth shell ring, the fifth shell ring and the right end socket are sequentially welded and connected;
a cylinder shroud plate is arranged on the outer sides of the first cylinder section and the fifth cylinder section in a surrounding mode and is suitable for being installed on a saddle; reinforcing rings are arranged on the inner sides of the first cylindrical shell section and the fifth cylindrical shell section, and vacuum rings are arranged on the inner sides of the second cylindrical shell section, the third cylindrical shell section and the fourth cylindrical shell section;
the left seal head and the right seal head respectively comprise a temperate zone plate, a polar edge plate and a polar middle plate; the temperature band plate is provided with a plurality of end-to-end plates along the circumferential direction, the number of the polar side plates is two, the polar side plates are arranged at the top of the temperature band plate, and the number of the polar middle plates is one, and the polar middle plates are arranged between the two polar middle plates; the temperature zone plate, the polar edge plate and the polar middle plate and the temperature zone plates are connected by welding, and the temperature zone plate, the polar edge plate and the polar middle plate are connected to form a hemispherical structure;
the first shell ring, the second shell ring, the third shell ring, the fourth shell ring and the fifth shell ring all comprise a plurality of shell ring plates, the shell ring plates are of arc-shaped structures, and the plurality of shell ring plates are connected in an end-to-end mode through welding and are connected to form a circular ring-shaped structure.
2. The lng shipborne catamaran tank of claim 1, wherein: one group of the temperature zone plates are sixteen, and the other group of the barrel joint plates are three.
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| CN201921156337.6U CN210592336U (en) | 2019-07-22 | 2019-07-22 | Liquefied natural gas ship-borne catamaran storage tank |
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| CN201921156337.6U CN210592336U (en) | 2019-07-22 | 2019-07-22 | Liquefied natural gas ship-borne catamaran storage tank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110356512A (en) * | 2019-07-22 | 2019-10-22 | 浙江新乐造船股份有限公司 | A kind of liquefied natural gas boat-carrying binary storage tank and its manufacturing method |
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2019
- 2019-07-22 CN CN201921156337.6U patent/CN210592336U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110356512A (en) * | 2019-07-22 | 2019-10-22 | 浙江新乐造船股份有限公司 | A kind of liquefied natural gas boat-carrying binary storage tank and its manufacturing method |
| CN110356512B (en) * | 2019-07-22 | 2024-08-20 | 浙江新乐造船股份有限公司 | Shipborne double-body storage tank for liquefied natural gas and manufacturing method thereof |
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