CN106402579A - Anti-cracking salt chemical equipment pipeline - Google Patents
Anti-cracking salt chemical equipment pipeline Download PDFInfo
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- CN106402579A CN106402579A CN201610807843.1A CN201610807843A CN106402579A CN 106402579 A CN106402579 A CN 106402579A CN 201610807843 A CN201610807843 A CN 201610807843A CN 106402579 A CN106402579 A CN 106402579A
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- salt chemical
- pipeline
- equipment pipeline
- salt
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- 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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
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Abstract
The invention discloses an anti-cracking salt chemical equipment pipeline. The anti-cracking salt chemical equipment pipeline comprises a salt chemical equipment pipeline, wherein a plurality of tight hoops are sequentially arranged on the pipeline outer side wall of the salt chemical equipment pipeline in a sleeving manner in the length direction of the pipeline; the tight hoops are of two-symmetrical semi arc structures; one sides of the tight hoops are connected hinges; the other sides of the tight hoops are fixed through bolts; the tight hoops apply radial prepressure, pointing to the axis, to the salt chemical equipment pipeline; and the radial prepressure is equal to or larger than brine pressure inside the salt chemical equipment pipeline. According to the anti-cracking salt chemical equipment pipeline, through the pressure, radial prepressure is applied to the salt chemical equipment pipeline, the pressure of brine inside the salt chemical equipment pipeline to the salt chemical equipment pipeline is counteracted, even though the pipeline interior of the salt chemical equipment pipeline has pitting corrosion due to the long-term action of brine, pitting corrosion parts do not crack under the compressive stress of brine, and the service life of the salt chemical equipment pipeline is greatly prolonged.
Description
Technical field
The present invention relates to salt chemical engineering equipment pipeline field is and in particular to a kind of salt chemical engineering equipment pipeline of crack resistence.
Background technology
Equipment corrosion cracking is the great difficult problem facing during chemical enterprises produce.Why salinization equipment exists respectively
Plant corrosion cracking problem, the working environment exceedingly odious with it is relevant after all, is mainly reflected in the following aspects：
（1）Chlorine ion concentration
In salt, chlorine ion concentration is high, and this is the root that rustless steel produces corrosion, the common environmental disutility side of stainless steel component
Formula such as spot corrosion, intercrystalline corrosion, crevice corrosion, stress corrosion cracking, fatigue corrosion fracture is all with to there is chloride ion in solution relevant.
There are some researches show, even if the relatively low Service Environment of chlorine ion concentration, be also not allow to stainless infection
Ignore, so, it is in exceedingly odious working environment with the stainless steel component of salt directly contact, the impact of chloride ion becomes
Key for problem analysis.
（2）Operating temperature
Distillation is the main technique means of salt salt manufacturing, and each section of brine temperature is slightly different, about at 90-120 DEG C about.Place
The activity of various elements all strengthens in the electrolyte in high-temperature bittern and in the rustless steel that contacts therewith, promotes stainless
Corrosion.Austenitic stainless steel stress corrosion fracture mostly occurs in the range of 50-300 DEG C, and in general, temperature is higher, stress
Corrosion fracture is more susceptible to.The rustless steel contacting with salt is exactly in this susceptibility temperature range, so, easily producing should
Power is corroded.
（3）Salt pressure
Salt pressure typically in 0.5MPa, make the material of the associated components such as pump valve, pipeline and distillating still bear suitable should
Power acts on.It will be apparent that the cracking of material is caused by stress after all, in the environment not having corrosive medium, material is opened
The limiting range of stress split is higher than the limiting range of stress under corrosive environment.
At present, chemical enterprises run into the problem of component cracking, often consider problem of materials it is believed that the anti-point of material first
Erosion, anti intercrystalline corrosion performance are not enough, cause rustless steel grade more and more higher used, in the case of really can't resolve problem,
Even with titanium alloy material.Nonetheless, nor effectively stop the early-age crack of salt chemical engineering component.Under not suiting the medicine to the illness
Medicine, do so can not tackle the problem at its root, and increased the production cost of enterprise on the contrary.For this reason, except improving material
Outside corrosion resistance aspect takes measures, also should take measures in terms of reducing stress.
Rustless steel has excellent mechanical property and corrosion resistance, has been widely used in various corrosive environments, all
As industries such as chemical industry, oil refining, aviation, shipbuilding and medicine.When the oxidisability in environment is sufficiently strong, the surface of this steel can not only
Generate fine and close passivating film, once and passivating film breakage can repair in time, make the metal under passivating film not continue to corrode, institute
So that the ability of rustless steel atmospheric corrosion resistance is preferable.But, under the conditions of some are specific, the especially environment containing chloride ion
In, the passivating film that formed is simultaneously unstable, is easily broken, thus there is serious local corrosion, such as spot corrosion and crevice corrosion etc..
Numerous studies show, under uniform temperature, the concentration of chloride ion will occur spot corrosion when exceeding the critical concentration of spot corrosion.
The critical concentration that TSUTSUMI etc. have studied the spot corrosion when 25 DEG C of 304 rustless steels is about 6 mol/L, the chlorine ion concentration in salt
Considerably beyond this critical concentration, thus, the rustless steel contacting with salt will be inevitably generated spot corrosion.At present, there is no data
Indicate the critical concentration of 316 series stainless steel spot corrosion, but, we still can be audaciously it is expected that the chlorine ion concentration of salt
Also its critical concentration certainly will be exceeded, so, for salinization equipment, replace 304 series stainless steels with 316 series, still not
The generation of spot corrosion can be stoped, because even if chloride ion is in tens ppm concentration ranges, at a certain temperature, luring through one section
Lead the phase, 316 rustless steels also can occur spot corrosion.
Adsorb the oxygen that rodent chloride ion can replace in passivating film by force, once chloride ion adsorbs in metal surface, will cut
Weak metal ion-atom key, leads to be passivated film rupture.In addition, the chloride ion in metal surface for the absorption can be formed with metal ion
Complex is dissolved in electrolyte, leads to the thinning of local area oxide-film so that in film more metal ions to film with
The interfacial migration of electrolyte, increased dissolving metal speed.
There is dissolving metal reaction in the bottom of point corrosion pit, due to hole area's oxygen uptake nearby, the increase of cation concn in hole is led
Chloride ion is caused to assemble into point corrosion pit.Chloride ion and metal cation combine to form metal chloride, metal chloride hydrolysis life
Acid is become to make there is relatively low pH value in hole, thus leading to metal that the dissolving of self-catalysis type occurs.The result of self-catalysis dissolving makes a little
Pit constantly growth and extension, forms elliposoidal pit.Research shows, point corrosion pit is strictly the possible position of crack initiation, but
There is not one-to-one relation in spot corrosion and crack initiation, only have larger depth or the point corrosion pit of aspect ratio could germinate
Crackle.For rustless steel, when stress concentration that spot corrosion causes reaches certain value, just can form formation of crack.
Once crackle is formed, the extension of crackle launches immediately, until workpiece rupture.Thus, the use longevity of stainless steel component
Life is actually made up of two basic periods, i.e. formation of crack germinating time and cracks can spread time, delay crack initiation or extension
Speed is all beneficial to improve the service life of stainless steel component.
Rustless steel cracking common are two types, respectively stress corrosion cracking and fatigue corrosion fracture.
（1）Stress corrosion cracking
Under specific corrosive medium and tension act on simultaneously, claiming less than the brittle cracking phenomenon of ultimate strength occurs in rustless steel
For stress corrosion.The formation of crack that stress corrosion occurs germinates in corrosion-susceptible microcell, and crackle once germinate, inside rustless steel just
There is a narrow active path, in the presence of tension, the passivating film of active path leading portion is repeatedly, break off and on
Split, corrosion is advanced along the path vertical with tension.In crack tip, because hydrogen is put in anion corrosion, a part of hydrogen diffusion
To most advanced and sophisticated metal inside, thus causing the METAL EMBRITTLEMENT at tip, ultimately resulting in rustless steel and producing brittle cracking.
Stress corrosion cracking (SCC) is germinated in component surface, in the majority with spot corrosion form, also has and is formed with grain boundary corrosion.Point corrosion pit
Or after crystal boundary crack initiation, crackle extends formation intergranular corrosion crackle immediately, when cracks can spread is to enough depth, due to
Stress intensity factor increases, and is extended by being changed into transcrystalline along brilliant extension before.
（2）Corrosion fatigue
Material is in alternate stress（Also referred to as cyclic stress or pulsating stress）With the early stage being occurred under the synergy of corrosive medium
Cracking phenomena, referred to as corrosion fatigue.The mechanical fatigue that the endurance ratio occurring in corrosive medium occurs in simple in the air is tight
Much heavier, for rustless steel, in the environment with saline as corrosive medium, its corrosion fatigue strength only has mechanical fatigue strong
The 50% of degree, that is, damage ratio for 0.5.
Corrosion fatigue is damage accumulation process, is made up of the germinating of crackle, extension and fracture three phases.Crack initiation with
Stress corrosion is the same, mainly germinates in point corrosion pit and grain boundary corrosion, has literature research to show, in the higher medium of chlorine ion concentration
In, also there is grain boundary corrosion in point corrosion pit bottom.
Fatigue striation on fracture is a typical characteristic of crack Propagation.Each striation corresponds to a fatigue and follows
Ring cycle, striation spacing corresponds to the crack propagation distance of this cycle, and chlorine ion concentration is higher, and the corrosion of crack tip is got over
Hurry up, the distance that crackle is pushed ahead is that striation spacing is bigger.
Early-stage Study shows, under corrosive environment, the mechanical property of stainless steel material can not show a candle to the power under corrosion-free environment
Learn performance, the rustless steel that its basic reason is that under corrosive environment is subject to mechanical and chemical dual function, this dual function
Not only accelerate the germinating of crackle but also accelerate the extension of crackle.
For crack initiation, the measure taken at present is concentrated mainly in material composition and the improvement of heat treatment, such as drops
In low rustless steel, in case intercrystalline corrosion, the content improving Mo, Ni, Ti in rustless steel is to strengthen its resistance to spot corrosion for the content of Si, P, S
Ability, salinization factory just meets above viewpoint to the continuous upgrading of rustless steel used.But, in the crack initiation stage, chemistry is made
With being diverse with the component that mechanism is contributed, this stage is mainly controlled by chemical action, University of Science ＆ Technology, Beijing Wu
Shady suitable grade just clearly proposes, and rustless steel promotes the occurrence and development process of spot corrosion still main by dynamic stress in chloride solution
Controlled by the effect of surrounding medium corrosivity.So, in the case of environmental corrosion factor is unalterable, crack initiation is can not
Avoid, delay the way of crack initiation can not significantly improve the fatigue life of component.
The cracks can spread stage is mainly controlled by mechanism, only in the presence of tension or alternate stress, splits
Stricture of vagina tip could occur plastic deformation, thus exposing fresh metal, this part metals ability makes crackle expand in the presence of corrosion
Exhibition, if crack tip can not open conversely speaking, crackle also would not extend.It will be apparent that the extension of crackle is in tension
（Alternate stress containing part on time shafts）In the presence of carry out, compressive stress（Alternate stress containing part under time shafts）Will not
Cause cracks can spread.Preset enough compressive stress on component, both can offset the tension being caused by pressure medium it is also possible to
Offset the tension part of alternate stress, make the effect of material internal compression chord, be beneficial to suppress the extension of crackle.
Material cracks comprise two basic processes, are crack initiation and cracks can spread respectively.Thus, the making of stainless steel component
Actually be made up of two basic periods with the life-span, i.e. formation of crack germinating time and cracks can spread time, delay crack initiation or
Expansion rate is all beneficial to improve the service life of stainless steel component.Upgrading rustless steel, by 304 to 316L, employing more resistant to
Spot corrosion, the rustless steel of anti intercrystalline corrosion, improve stainless steel component service life by delaying crack initiation in fact, right
Hinder cracks can spread that what does not have to help.So, project team thinks, prevents stainless steel component early-age crack, also should prolong
Slow cracks can spread aspect is made an effort.
Under corrosive environment, the mechanical property of stainless steel material can not show a candle to the mechanical property under corrosion-free environment, and it is basic
The rustless steel that reason is that under corrosive environment is subject to mechanical and chemical dual function, and this dual function had both accelerated sprouting of crackle
The raw extension again accelerating crackle.But, in the crack initiation stage, the component that chemical action and mechanism are contributed is completely not
With, this stage is mainly controlled by chemical action, and in the case of environmental corrosion factor is unalterable, crack initiation is to keep away
Exempt from, delay the way of crack initiation can not significantly improve the service life of component.
The cracks can spread stage is mainly controlled by mechanism, only in the presence of tension or alternate stress, splits
Stricture of vagina tip could occur plastic deformation, thus exposing fresh metal, this part metals ability makes crackle expand in the presence of corrosion
Exhibition, if crack tip can not open conversely speaking, crackle also would not extend.So, the extension of crackle is in tension
（Alternate stress containing part on time shafts）In the presence of carry out, compressive stress（Alternate stress containing part under time shafts）Will not
Cause cracks can spread.On stainless steel component, preset enough compressive stress, both can offset the tension being caused by pressure medium,
The tension part of alternate stress can also be offset, make the effect of material internal compression chord, be beneficial to suppress crackle
Extension.
Content of the invention
It is an object of the invention to：Overcome the deficiencies in the prior art, a kind of salt chemical engineering equipment pipeline of crack resistence is provided, lead to
Cross and be provided with lock ring on the surface of salt chemical engineering equipment pipeline, make lock ring apply radial direction precompression to salt chemical engineering equipment pipeline, counteract
In salt chemical engineering equipment pipeline, salt is for the pressure of salt chemical engineering equipment pipeline, even if the pipe inherence salt of salt chemical engineering equipment pipeline
Create spot corrosion under long term, but the effect of the radial direction precompression to salt chemical engineering equipment pipeline counteracts salinization due to lock ring
In construction equipment pipeline salt for the pressure of salt chemical engineering equipment pipeline so that spot corrosion position will not be opened under the compressive stress of salt
Split, substantially prolongs the service life of salt chemical engineering equipment pipeline；By the effect of bed course, make lock ring pre- for salt chemical engineering pipeline
Pressure is uniformly distributed；By the effect of rib, the high intensity of lock ring, increased the maximum precompression to salt chemical engineering pipeline for the lock ring
Value；By the effect of slotted eye, reduce the deadweight of lock ring, also reduce the cost of lock ring simultaneously；By the angle between adjacent lock ring
Degree difference so that lock ring precompression that salt chemical engineering equipment pipeline is applied evenly；By hydraulic oil for salt chemical engineering equipment pipe
The pressure in road, counteracts the salt pressure in salt chemical engineering equipment pipeline so that spot corrosion position will not be opened under the compressive stress of salt
Split, substantially prolongs the service life of salt chemical engineering equipment pipeline；And due to being the oil pressure of hydraulic oil to salt chemical engineering equipment pipeline
The effect carrying out, the pressure of its effect is more uniform for the pressure of salt chemical engineering equipment pipeline compared to above-mentioned lock ring；Pass through
The effect of piston cylinder inner slide, can bear a range of pressure oscillation of salt in salt chemical engineering equipment pipeline, improve this
The scope of application of invention；By the active fuel feeding of hydraulic pump, salt certain limit in salt chemical engineering equipment pipeline can not only be born
Interior pressure oscillation, even and if the salt in salt chemical engineering equipment pipeline due to produce etc. former thus result in pressure limit change,
Also the pressure of hydraulic oil can also pass through the effect actively change of hydraulic pump, not only can bear the pressure oscillation of small range, and
And the salt of the different pressures needed for various processes can also be suitable for.
The technical solution used in the present invention is：
The salt chemical engineering equipment pipeline of crack resistence, including salt chemical engineering equipment pipeline, the pipeline lateral wall of described salt chemical engineering equipment pipeline
On be equipped with multiple lock rings successively along the length direction of pipeline, described lock ring is two symmetrical semi-circular arcuate structures, described lock ring
Side be connected through the hinge, opposite side is bolted, and described lock ring is provided with to salt chemical engineering equipment pipeline and to point to axis
Radial direction precompression, described radial direction precompression is equal to or more than the salt pressure in salt chemical engineering equipment pipeline.
The further improvement project of the present invention is that described lock ring is provided with bed course with the side of salt chemical engineering equipment tube contacts.
The present invention further improvement project is that the outer surface of described lock ring is provided with many ribs, described rib be with tightly
The arc of hoop form fit；On described lock ring be located at rib adjacent between be provided with slotted eye.
The present invention further improvement project is, the lock ring on described salt chemical engineering equipment pipeline and adjacent another lock ring around
The angled difference of salt chemical engineering equipment conduit axis.
The salt chemical engineering equipment pipeline of cracking, including salt chemical engineering equipment pipeline, outside the pipeline of described salt chemical engineering equipment pipeline
It is equipped with oil pressure pipeline, described oil pressure pipeline and the concentric setting of salt chemical engineering equipment pipeline, the side wall of oil pressure pipeline is provided with list
To inlet valve, between oil pressure pipeline and salt chemical engineering equipment pipeline, it is provided with hydraulic oil, the pressure of described hydraulic oil is equal to or more than salt
Salt pressure in chemical industry equipment pipeline.
The present invention further improvement project is to be respectively equipped with oil pipe A and brine pipe A on the side wall of described oil pressure pipeline,
One end of described oil pipe A passes through the side wall of oil pressure pipeline to connect with the hydraulic oil in oil pressure pipeline, the other end of oil pipe A and piston
One end connection in cylinder；One end of described brine pipe A is each passed through the side wall of oil pressure pipeline and the side wall of salt chemical engineering equipment pipeline,
Connect with the salt in salt chemical engineering equipment pipeline, the other end of brine pipe A is connected with the other end in piston cylinder, described piston cylinder
Inside it is connected with the slide block mating with piston cylinder, described oil pipe A and brine pipe A is respectively communicated with the both sides in slide block.
The salt chemical engineering equipment pipeline of crack resistence, including salt chemical engineering equipment pipeline, outside the pipeline of described salt chemical engineering equipment pipeline
Side is equipped with oil pressure pipeline, described oil pressure pipeline and the concentric setting of salt chemical engineering equipment pipeline, oil pressure pipeline and salt chemical engineering equipment
It is provided with hydraulic oil between pipeline, the side wall of described oil pressure pipeline is respectively equipped with oil inlet pipe and brine pipe B, the one of described oil inlet pipe
End is connected through the side wall of oil pressure pipeline with the hydraulic oil in oil pressure pipeline, and the other end of oil inlet pipe passes through oil pipe C and hydraulic pump
Liquid outlet connection；One end of described brine pipe B is each passed through the side wall of oil pressure pipeline and the side wall of salt chemical engineering equipment pipeline, with
Salt connection in salt chemical engineering equipment pipeline, the other end of brine pipe B is connected respectively with salt pressure gauge and pressure transducer respectively
Logical, the pressure of described hydraulic oil is equal to or more than the salt pressure in salt chemical engineering equipment pipeline.
The further improvement project of the present invention is to be communicated with air relief valve on described oil pipe C, described oil pipe C be located at air relief valve with
Between hydraulic pump, normally opened overflow valve is had by oil pipe B parallel communication；Described oil pipe C is located between air relief valve and feed tube and passes through oil
Pipe C parallel communication has overflow valve.
The present invention further improvement project is that described oil pipe C is located at parallel communication between oil inlet pipe and oil pipe D oil pressure
Pressure gauge.
The present invention further improvement project is that the rated pressure of described hydraulic pump is more than the setting pressure of normally opened overflow valve
Power, the setting pressure of normally opened overflow valve is more than the setting pressure of overflow valve, and the setting pressure of overflow valve is more than the setting of air relief valve
Pressure.
The beneficial effects of the present invention is：
Firstth, the salt chemical engineering equipment pipeline of the crack resistence of the present invention, by being provided with lock ring on the surface of salt chemical engineering equipment pipeline, makes
Lock ring applies radial direction precompression to salt chemical engineering equipment pipeline, counteracts in salt chemical engineering equipment pipeline salt for salt chemical engineering equipment pipe
The pressure in road, even if create spot corrosion in the pipe of salt chemical engineering equipment pipeline, but due to lock ring pair under the long term of salt
The effect of the radial direction precompression of salt chemical engineering equipment pipeline counteracts in salt chemical engineering equipment pipeline salt for salt chemical engineering equipment pipeline
Pressure so that will not ftracture under the compressive stress of salt in spot corrosion position, substantially prolongs the use longevity of salt chemical engineering equipment pipeline
Life.
Secondth, the salt chemical engineering equipment pipeline of the crack resistence of the present invention, by the effect of bed course, makes lock ring for salt chemical engineering pipe
The precompression in road is uniformly distributed.
3rd, the salt chemical engineering equipment pipeline of the crack resistence of the present invention, by the effect of rib, the high intensity of lock ring, increase
Add the maximum precompressed force value to salt chemical engineering pipeline for the lock ring.
4th, the salt chemical engineering equipment pipeline of the crack resistence of the present invention, by the effect of slotted eye, reduces the deadweight of lock ring,
Also reduce the cost of lock ring simultaneously.
5th, the salt chemical engineering equipment pipeline of the crack resistence of the present invention, by the differential seat angle between adjacent lock ring so that lock ring
For salt chemical engineering equipment pipeline apply precompression evenly.
6th, the salt chemical engineering equipment pipeline of the crack resistence of the present invention, by hydraulic oil for salt chemical engineering equipment pipeline pressure
Power, counteracts the salt pressure in salt chemical engineering equipment pipeline so that will not ftracture under the compressive stress of salt in spot corrosion position, significantly
Extend the service life of salt chemical engineering equipment pipeline；And work salt chemical engineering equipment pipeline being carried out due to the oil pressure being hydraulic oil
With the pressure of its effect is more uniform for the pressure of salt chemical engineering equipment pipeline compared to above-mentioned lock ring.
7th, the salt chemical engineering equipment pipeline of the crack resistence of the present invention, by the effect of piston cylinder inner slide, can bear salt
The a range of pressure oscillation of salt in chemical industry equipment pipeline, improves the scope of application of the present invention.
8th, the salt chemical engineering equipment pipeline of the crack resistence of the present invention, by the active fuel feeding of hydraulic pump, can not only bear
The a range of pressure oscillation of salt in salt chemical engineering equipment pipeline, even and if the salt in salt chemical engineering equipment pipeline is due to life
The former pressure limit that thus results in such as product changes, and also the pressure of hydraulic oil can also pass through the effect actively change of hydraulic pump, not only
The pressure oscillation of small range can be born, but also the salt of the different pressures needed for various processes can be suitable for.
Brief description：
Fig. 1 is the schematic front view of first embodiment of the invention structure.
Fig. 2 is the diagrammatic side-view cross-sectional schematic diagram of first embodiment of the invention structure.
Fig. 3 is the diagrammatic side-view cross-sectional schematic diagram of second embodiment of the invention structure.
Fig. 4 is the diagrammatic side-view cross-sectional schematic diagram of third embodiment of the invention structure.
Specific embodiment：
First embodiment
Understand, the present invention includes salt chemical engineering equipment pipeline 1, outside the pipeline of described salt chemical engineering equipment pipeline 1 in conjunction with Fig. 1 and Fig. 2
On wall, the length direction along pipeline is equipped with multiple lock rings 3 successively, and described lock ring 3 is two symmetrical semi-circular arcuate structures, described
The side of lock ring 3 is connected by hinge 4, and opposite side passes through bolt 6 to be fixed, and described lock ring 3 is provided with finger to salt chemical engineering equipment pipeline 1
To the radial direction precompression of axis, described radial direction precompression is equal to or more than salt 2 pressure in salt chemical engineering equipment pipeline 1.Pass through
It is provided with lock ring 3 on the surface of salt chemical engineering equipment pipeline 1, make lock ring 3 apply radial direction precompression to salt chemical engineering equipment pipeline 1, offset
In salt chemical engineering equipment pipeline 1, salt 2 is for the pressure of salt chemical engineering equipment pipeline 1, even if the pipe of salt chemical engineering equipment pipeline 1 is inherent
Create spot corrosion under the long term of salt 2, but due to lock ring 3 the radial direction precompression to salt chemical engineering equipment pipeline 1 effect
The pressure counteracting salt 2 in salt chemical engineering equipment pipeline 1 for salt chemical engineering equipment pipeline 1 is so that spot corrosion position will not be in salt 2
Compressive stress under ftracture, substantially prolongs the service life of salt chemical engineering equipment pipeline 1.
The side that described lock ring 3 is contacted with salt chemical engineering equipment pipeline 1 is provided with bed course 7.Described bed course 7 is metallic gasket, makes
Lock ring 3 is uniformly distributed for the precompression of salt chemical engineering pipeline 1.
The outer surface of described lock ring 3 is provided with many ribs 8, and described rib 8 is the arc with lock ring 3 form fit；Described
On lock ring 3 be located at rib 8 adjacent between be provided with slotted eye 9.Described rib 8 improves the intensity of lock ring 3, increased lock ring 3 to salt
The maximum precompressed force value of chemical pipeline 1；Slotted eye 9 reduces the deadweight of lock ring 3, also reduces the cost of lock ring 3 simultaneously.
Lock ring 3 on described salt chemical engineering equipment pipeline 1 is had around salt chemical engineering equipment pipeline 1 axis with adjacent another lock ring 3
Differential seat angle.By the differential seat angle between adjacent lock ring 3 so that the precompression that applies for salt chemical engineering equipment pipeline 1 of lock ring 3 is more equal
Even.
Described lock ring 3 is rotated by the bearing pin 10 of hinge 4, and the connecting plate 5 that described bolt 6 passes through set by lock ring 3 is fixing, institute
Stating bolt 6 is torque bolt.
Second embodiment
As shown in Figure 3, the present invention includes salt chemical engineering equipment pipeline 1, is equipped with oil outside the pipeline of described salt chemical engineering equipment pipeline 1
Pressure pipeline 3 ', described oil pressure pipeline 3 ' and the concentric setting of salt chemical engineering equipment pipeline 1, the side wall of oil pressure pipeline 3 is provided with unidirectional
Inlet valve 13, is provided with hydraulic oil 12 between oil pressure pipeline 3 and salt chemical engineering equipment pipeline 1.By on salt chemical engineering equipment pipeline 1 surface
It is nested with oil pressure pipeline 3 ', and be full of hydraulic oil 12 between oil pressure pipeline 3 ' and salt chemical engineering equipment pipeline 1, described hydraulic oil 12
Pressure is equal to or more than salt 2 pressure in salt chemical engineering equipment pipeline 1.By hydraulic oil 12 for salt chemical engineering equipment pipeline 1
Pressure, counteracts salt 2 pressure in salt chemical engineering equipment pipeline 1 so that spot corrosion position will not be opened under the compressive stress of salt 2
Split, substantially prolongs the service life of salt chemical engineering equipment pipeline 1；And due to being the oil pressure of hydraulic oil 12 to salt chemical engineering equipment pipe
The effect that road 1 is carried out, its effect pressure compared to the lock ring 3 in first embodiment for salt chemical engineering equipment pipeline 1 pressure
More uniform.
Oil pipe A15 and brine pipe A14 is respectively equipped with the side wall of described oil pressure pipeline 3 ', one end of described oil pipe A15 is worn
The side wall crossing oil pressure pipeline 3 ' is connected with the hydraulic oil 12 in oil pressure pipeline 3 ', in the other end of oil pipe A15 and piston cylinder 16
One end connects；One end of described brine pipe A14 is each passed through the side wall of oil pressure pipeline 3 ' and the side wall of salt chemical engineering equipment pipeline 1,
Connect with the salt 2 in salt chemical engineering equipment pipeline 1, the other end of brine pipe A14 is connected with the other end in piston cylinder 16, described
It is connected with the slide block 17 mating with piston cylinder 16, described oil pipe A15 and brine pipe A14 is respectively communicated with cunning in piston cylinder 16
The both sides of block 17.By the effect of piston cylinder 16 inner slide 17, so that the pressure of the pressure of hydraulic oil 12 and salt 2 is all the time
Equal, after preventing the pressure of salt 2 in salt chemical engineering equipment pipeline 1 from producing fluctuation, can still produce shadow to salt chemical engineering equipment pipeline 1
Ring.For first embodiment, the present embodiment passes through the effect of piston cylinder 16 inner slide 17, can bear salt chemical engineering equipment
The a range of pressure oscillation of salt 2 in pipeline 1, improves the scope of application of the present invention.
3rd embodiment
As shown in Figure 4, the present invention includes salt chemical engineering equipment pipeline 1, is equipped with oil outside the pipeline of described salt chemical engineering equipment pipeline 1
Pressure pipeline 3 ', described oil pressure pipeline 3 ' and the concentric setting of salt chemical engineering equipment pipeline 1, oil pressure pipeline 3 and salt chemical engineering equipment pipeline 1
Between be provided with hydraulic oil 12, the side wall of described oil pressure pipeline 3 ' is respectively equipped with oil inlet pipe 13 ' and brine pipe B14 ', described oil-feed
One end of pipe 13 ' passes through the side wall of oil pressure pipeline 3 ' to connect with the hydraulic oil 12 in oil pressure pipeline 3 ', the other end of oil inlet pipe 13 '
Connected with the liquid outlet of hydraulic pump 18 by oil pipe C26；One end of described brine pipe B14 ' is each passed through the side of oil pressure pipeline 3 '
The side wall of wall and salt chemical engineering equipment pipeline 1, is connected with the salt 2 in salt chemical engineering equipment pipeline 1, the other end of brine pipe B14 ' divides
It is not respectively communicated with salt pressure gauge 23 and pressure transducer 24, the pressure of described hydraulic oil 12 is equal to or more than salt chemical engineering equipment
Salt 2 pressure in pipeline 1.By hydraulic oil 12 for the pressure of salt chemical engineering equipment pipeline 1, counteract salt chemical engineering equipment pipeline
Salt 2 pressure in 1, so that will not ftracture under the compressive stress of salt 2 in spot corrosion position, substantially prolongs salt chemical engineering equipment pipeline
1 service life；And effect salt chemical engineering equipment pipeline 1 being carried out due to the oil pressure being hydraulic oil 12, the pressure of its effect
More uniform for the pressure of salt chemical engineering equipment pipeline 1 compared to the lock ring 3 in first embodiment；Compared in second embodiment
The adjustment effect of hydraulic oil 12, by the active fuel feeding of hydraulic pump 18, can not only bear salt 2 in salt chemical engineering equipment pipeline 1
A range of pressure oscillation, even and if the salt 2 in salt chemical engineering equipment pipeline 1 thus results in pressure because production etc. is former
Scope changes, and also the pressure of hydraulic oil 12 can also pass through the effect actively change of hydraulic pump 18, not only can bear second real
Apply the pressure oscillation of small range in example, but also the salt 2 of the different pressures needed for various processes can be suitable for.
Described hydraulic pump 18 is constant-pressure variable hydraulic pump.Ensure that the pressure output of hydraulic oil 12 is invariable.
Air relief valve 20 is communicated with described oil pipe C26, described oil pipe C26 is located at and passes through between air relief valve 20 and hydraulic pump 18
Oil pipe B25 parallel communication has normally opened overflow valve 19；Described oil pipe C26 is located between air relief valve 20 and feed tube 13 ' and passes through oil pipe
C27 parallel communication has overflow valve 21.
Described air relief valve 20 is guide proportion air relief valve, and normally opened overflow valve 19 is first electromagnetic relief valve, and overflow valve 21 is first
Lead proportional pressure control valve.
Described oil pipe C26 is located at parallel communication between oil inlet pipe 13 ' and oil pipe D27 oil pressure pressure gauge 22.
The rated pressure of described hydraulic pump 18 is more than the setting pressure of normally opened overflow valve 19, the setting pressure of normally opened overflow valve 19
Power is more than the setting pressure of overflow valve 21, and the setting pressure of overflow valve 21 is more than the setting pressure of air relief valve 20.Ensure that hydraulic pressure
The normal operation of oily 12 oil circuits, prevents hydraulic oil 12 pressure in oil pressure pipeline 3 ' excessive.
Claims (2)
1. the salt chemical engineering equipment pipeline of crack resistence, including salt chemical engineering equipment pipeline（1）It is characterised in that：Described salt chemical engineering equipment
Pipeline（1）Pipeline lateral wall on be equipped with multiple lock rings successively along the length direction of pipeline（3）, described lock ring（3）For two
Symmetrical semi-circular arcuate structure, described lock ring（3）Side pass through hinge（4）Connect, opposite side passes through bolt（6）Fixing, described
Lock ring（3）To salt chemical engineering equipment pipeline（1）It is provided with the radial direction precompression pointing to axis, described radial direction precompression is equal to or more than salt
Chemical industry equipment pipeline（1）Interior salt（2）Pressure；Described lock ring（3）With salt chemical engineering equipment pipeline（1）The side of contact is provided with pad
Layer（7）；Described lock ring（3）Outer surface be provided with many ribs（8）, described rib（8）It is and lock ring（3）The arc of form fit
Shape；Described lock ring（3）Above it is located at rib（8）It is provided with slotted eye between adjacent（9）.
2. crack resistence as claimed in claim 1 salt chemical engineering equipment pipeline it is characterised in that：Described salt chemical engineering equipment pipeline
（1）On lock ring（3）With adjacent another lock ring（3）Around salt chemical engineering equipment pipeline（1）The angled difference of axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610807843.1A CN106402579A (en) | 2015-01-29 | 2015-01-29 | Anti-cracking salt chemical equipment pipeline |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610807843.1A CN106402579A (en) | 2015-01-29 | 2015-01-29 | Anti-cracking salt chemical equipment pipeline |
| CN201510045613.1A CN104565823B (en) | 2015-01-29 | 2015-01-29 | Cracking-resistant salt and chemical making equipment pipe |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510045613.1A Division CN104565823B (en) | 2015-01-29 | 2015-01-29 | Cracking-resistant salt and chemical making equipment pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106402579A true CN106402579A (en) | 2017-02-15 |
Family
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610807843.1A Pending CN106402579A (en) | 2015-01-29 | 2015-01-29 | Anti-cracking salt chemical equipment pipeline |
| CN201510045613.1A Active CN104565823B (en) | 2015-01-29 | 2015-01-29 | Cracking-resistant salt and chemical making equipment pipe |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510045613.1A Active CN104565823B (en) | 2015-01-29 | 2015-01-29 | Cracking-resistant salt and chemical making equipment pipe |
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| Country | Link |
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| CN (2) | CN106402579A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108131557A (en) * | 2017-12-18 | 2018-06-08 | 杜海芳 | Safe gas supply device with environmental protection characteristic, chemical industry equipment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106195525B (en) * | 2016-07-18 | 2018-11-27 | 绍兴汇聚塑业有限公司 | A kind of pipeline for oil gas transport |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1417106A (en) * | 1971-09-01 | 1975-12-10 | Press W & Son Ltd | Method of and apparatus for sealing pipe joints |
| US4274436A (en) * | 1979-08-16 | 1981-06-23 | Xomox Corporation | Wafer-type swing check valve construction |
| CN101178144A (en) * | 2007-11-28 | 2008-05-14 | 刘运月 | Pipeline broken fast repair clip |
| CN302685970S (en) * | 2013-12-18 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55119260A (en) * | 1979-03-07 | 1980-09-12 | Hitachi Zosen Corp | Preventing method of stress corrosion cracking for pressure vessel |
| AU8095882A (en) * | 1981-03-09 | 1982-09-16 | Northern Border Pipeline Co. | Installing crack arrestor on pipes |
| CN204437713U (en) * | 2015-01-29 | 2015-07-01 | 淮安信息职业技术学院 | The crack resistence salt chemical engineering equipment pipeline of adjustable pressure |
| CN204420581U (en) * | 2015-01-29 | 2015-06-24 | 江苏井神盐化股份有限公司第一分公司 | The salt chemical engineering equipment pipeline configuration of crack resistence |
-
2015
- 2015-01-29 CN CN201610807843.1A patent/CN106402579A/en active Pending
- 2015-01-29 CN CN201510045613.1A patent/CN104565823B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN302685970S (en) * | 2013-12-18 | |||
| GB1417106A (en) * | 1971-09-01 | 1975-12-10 | Press W & Son Ltd | Method of and apparatus for sealing pipe joints |
| US4274436A (en) * | 1979-08-16 | 1981-06-23 | Xomox Corporation | Wafer-type swing check valve construction |
| CN101178144A (en) * | 2007-11-28 | 2008-05-14 | 刘运月 | Pipeline broken fast repair clip |
Non-Patent Citations (1)
| Title |
|---|
| 李政等: "《中国实施CO2捕集与封存的参考意见》", 31 May 2012 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108131557A (en) * | 2017-12-18 | 2018-06-08 | 杜海芳 | Safe gas supply device with environmental protection characteristic, chemical industry equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104565823A (en) | 2015-04-29 |
| CN104565823B (en) | 2017-04-19 |
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Application publication date: 20170215 |