CN105465377B - A kind of dismountable LNG storage tank shaft bottom valve - Google Patents
A kind of dismountable LNG storage tank shaft bottom valve Download PDFInfo
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- CN105465377B CN105465377B CN201511013572.4A CN201511013572A CN105465377B CN 105465377 B CN105465377 B CN 105465377B CN 201511013572 A CN201511013572 A CN 201511013572A CN 105465377 B CN105465377 B CN 105465377B
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- pump sump
- storage tank
- lng storage
- pump
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- 238000003860 storage Methods 0.000 title claims abstract description 101
- 238000007789 sealing Methods 0.000 claims abstract description 18
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 33
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 230000002000 scavenging effect Effects 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 239000011261 inert gas Substances 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 5
- 230000014759 maintenance of location Effects 0.000 claims description 5
- 238000010926 purge Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 abstract description 25
- 239000003949 liquefied natural gas Substances 0.000 description 132
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 28
- 239000003345 natural gas Substances 0.000 description 13
- 230000008859 change Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 230000008439 repair process Effects 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 210000004907 gland Anatomy 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/46—Mechanical actuating means for remote operation
- F16K31/465—Mechanical actuating means for remote operation by flexible transmission means, e.g. cable, chain, bowden wire
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/03—Mixtures
- F17C2221/032—Hydrocarbons
- F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The present invention relates to a kind of dismountable LNG storage tank shaft bottom valve, belong to LNG storage equipment areas.Including valve seat, valve element, spring, spring base, valve base seal and valve element guide pillar, spring base is fixedly connected with valve element guide pillar one end, the other end of valve element guide pillar one end is fixedly connected through valve element with valve seat, valve element is set on valve element guide pillar and its lower end is butted on spring upper end, the lower end of spring is butted on spring base, the valve base seal for sealing is provided between valve seat and valve element, spring force makes valve element promote valve element with valve seat gluing, sealing to external force；Valve seat is arranged on the bottom of pump sump, and pump sump is connected in LNG storage tank and stretched into LNG storage tank, is connected with loop coil under pump sump in the bottom thread of pump sump, valve seat is tightly connected with loop coil under pump sump.Dismountable LNG storage tank shaft bottom valve has service life length, dismountable feature, can reduce the maintenance cost of LNG storage tank shaft bottom valve, improves service efficiency and the life-span of LNG storage tank.
Description
Technical field
The present invention relates to a kind of dismountable LNG storage tank shaft bottom valve, belong to LNG storage equipment areas.
Background technology
LNG（Liquefied Natural Gas）, i.e. the english abbreviation of liquefied natural gas.Natural gas be in gas field from
So mined fuel gas, main component are made up of methane.LNG be cooled to by gaseous natural gas at ambient pressure-
162 DEG C, it is allowed to condense into liquid.It can greatly save storage and transportation space and cost after natural gas liquefaction, and with calorific value is big, property
Can be high the features such as.LNG is a kind of cleaning, the efficient energy.Because imported L NG contributes to energy-consuming state to realize that energy supply is more
Memberization, ensure energy security, and export LNG contribute to natural gas producing nation effective exploitation natural gas resource, increase foreign exchange earnings,
Promote national economic development, thus LNG trades are just turning into the new focus of global energy markets.Natural gas is more next as clean energy resource
More favored, LNG is all classified as preferred fuels by many countries, and ratio of the natural gas in energy supply increases sharply.Liquefaction
Natural gas just with every year about 12% rapid growth, turns into the whole world and increases one of most swift and violent energy industry.Global LNG in recent years
Production and trade it is increasingly active, LNG turns into rare cleaning resource, as the new focus of world's oil and gas industry.To protect
Demonstrate,proving energy supply diversification and improve energy consumption structure, some energy-consuming big countries increasingly pay attention to LNG introduction, Japan,
LNG receiving stations are all being built in South Korea, the U.S., Europe on a large scale.International major oil companies are also one after another by its new profit growth point
LNG business is turned to, LNG is by as the popular energy commodity of next whole world contention after oil.Natural Gas In China is using extremely
Imbalance, proportion very little of the natural gas in Chinese energy.From the point of view of the natural gas development situation of China, natural gas resource has
Limit, gas production are far smaller than demand, and insufficiency of supply-demand is increasing.While China's economic sustained and rapid development, to protect
It is but extremely in short supply to hinder economic energy source and power.For the energy resource structure of China based on coal, oil, natural gas only account for the ratio of very little
Example, well below world average level.With continuous growth of the country to energy demand, LNG is introduced by the energy of optimization China
Source structure, effectively solve the energy safety of supply, the two fold problem of ecological environmental protection, realize economic and society sustainable development
Play a significant role.It is domestic at present without instructing LNG storage tank（1）The related specifications of design, LNG largely store up as a kind of boiling liquid
It is stored in insulated storage tank, has special physical characteristic, therefore the operation and management of storage tank suffer from some special places.This
A little physical characteristics include LNG evaporation and rolling.
In existing industry, the LNG storage tank shaft bottom valve with shaft bottom valve is not removable, can not change valve element and valve base seal, when
When pump sump bottom valve produces leakage or damage, need to cut LNG storage tank open can change maintenance pump sump bottom valve.Built-in pump type LNG
Storage tank is that LNG immersed pumps are directly placed in into tank inside, and maintenance needs tank inside mediator depletion when changing and purged dry
Only it can repair or change, waste ample resources and repair time；LNG storage tank shaft bottom valve with shaft bottom valve is not removable, can not
Change valve element and valve base seal..
The content of the invention
It is an object of the invention to：For above-mentioned problem, there is provided a kind of dismountable LNG storage tank shaft bottom valve, can
The LNG storage tank shaft bottom valve of dismounting has service life length, dismountable feature, can reduce the maintenance of LNG storage tank shaft bottom valve into
This, improves service efficiency and the life-span of LNG storage tank.The present apparatus is simple in construction easy to use, can effectively realize that LNG dives liquid
The quick assembling of pump and use, the effective safety in utilization for ensureing immersed pump, the dismounting that can effectively improve immersed pump are imitated
Rate, reduce the cost of LNG storage tank maintenance in use and maintenance；
The technical solution adopted by the present invention is as follows：
The invention discloses a kind of dismountable LNG storage tank shaft bottom valve, including valve seat, valve element, spring, spring base, valve seat
Seal and valve element guide pillar, spring base are fixedly connected with valve element guide pillar one end, and the other end of valve element guide pillar passes through valve element and valve seat
It is fixedly connected, valve element is set on valve element guide pillar and its lower end is butted on spring upper end, and the lower end of spring is butted on spring base, in valve
The valve base seal for sealing is provided between seat and valve element, spring force makes valve element promote valve with valve seat gluing, sealing to external force
Core；Valve seat is arranged on the bottom of pump sump, and pump sump is connected in LNG storage tank and stretched into LNG storage tank, connects in the bottom thread of pump sump
Loop coil under pump sump is connected to, valve seat is tightly connected with loop coil under pump sump.
Due to said structure, dismountable LNG storage tank shaft bottom valve has service life length, dismountable feature, can drop
The maintenance cost of low LNG storage tank shaft bottom valve, improve service efficiency and the life-span of LNG storage tank.The built-in pump type LNG of its in the structure
Storage tank is that LNG immersed pumps are directly placed in into tank inside, without tank inside mediator depletion, reduction are safeguarded when maintenance is changed
Cost and time；Due to the maintenance of LNG immersed pumps once, pump sump bottom valve opens and closes once, therefore the service life of pump sump bottom valve is very long,
Service efficiency and the life-span of LNG storage tank are improved, its valve core structure is simple, easy-to-use, and its LNG immersed pump is pushed away inapplicable when
Movable valve plug, pump sump is set to isolate with valve body, this structure can facilitate the replacing or maintenance of the parts such as valve element, valve seat and spring,
The efficiency changed and the efficiency of maintenance are improved, reduces the use cost of equipment.
Further, loop coil is provided with valve seat stopper ring under the pump sump, and valve seat is placed in valve seat stopper ring and and pump sump
Lower loop coil threaded connection, the junction of loop coil is provided with sealing ring under valve seat stopper ring and pump sump.Valve seat stopper ring can have
The position of the limitation valve seat of effect, in the efficiency and peace that dismounting allows to guide the position of its installation of valve seat rapid alignment to improve installation
The simplification of dress.
Further, is provided with valve seat in the pump sump, valve element is opened under LNG immersed pump Action of Gravity Field, the pump sump and
LNG storage tank is detachably connected by bolt.Due to said structure, pump sump can integrally be pulled down, can effectively improve pump sump
The disassembly efficiency of bottom valve arrangement, effectively ensure the quick of its dismounting, the cost of overhaul of pump sump bottom valve arrangement can be reduced.
Further, the pump sump upper end is provided with hoisting structure, and the hoisting mechanism, which is connected with, carries pump hoist cable, is hung carrying pump
The lower end connection LNG immersed pumps of rope, the hoisting structure liftable is so that LNG immersed pumps promote valve seat to open or make valve seat in bullet
Closed in the presence of spring force.Hoisting mechanism at the top of pump sump, the LNG immersed pumps can be lifted to a certain extent, so as to control
The pump sump bottom valve opening and closing in pump sump bottom is set up, realizes isolating for pump sump and LNG storage tank body under sealed conditions.
Further, the hoisting structure includes pump sump top nut, operation screw rod, rotating hoisting ring, operates screw rod and pump sump
Top nut is threadedly coupled, and the end for operating screw rod is connected by rotating hoisting ring with carrying pump hoist cable, and the rotating hoisting ring is used to make to carry pump
Hoist cable can rotate relative to operation screw rod.The hoisting structure realizes the lifting of LNG immersed pumps by helicitic texture, can be effective
Ensure the sealing of pump sump, while more can realize the liftings of LNG immersed pumps in labour-saving, ensureing the safety of the present apparatus normally makes
With.
Further, the oral area of pump sump is provided with pump sump blind flange, the other end for operating screw rod passes through pump sump blind flange
In order to operate the rotating operation of screw rod.Operation screw rod can be advantageous to device through pump sump blind flange and not open the feelings of pump sump
LNG immersed pumps are lifted under condition, improve the security of LNG storage tank, strengthen the overhaul efficiency of the pump sump of LNG storage tank.
Further, liquid flexible pipe, the output end of LNG immersed pumps and one end phase of drain pipe flexible pipe are provided with out in the pump sump
Even, the other end for going out liquid flexible pipe is communicated to outside LNG storage tank.
Further, it is described that the scavenging conduit being communicated in pump sump is provided with the top of pump sump, it is connected with and blows on scavenging conduit
Stop valve is swept, drain pipe is connected with pump sump, liquid stop valve is provided with out on drain pipe, in one end of drain pipe and goes out liquid flexible pipe
Connection, drain pipe have inverted U-bend portion, form sealing gland.It, which purges stop valve, can coordinate scavenging conduit to entering in pump sump
Row cleaning, prevents pump sump to be mixed into impurity, influences the security of LNG storage tank.The sealing gland that its U-bend portion is formed can be effective
Prevent the liquid in pipeline from flowing backwards, effectively improve the service efficiency and using effect of equipment.
Further, its method for dismounting is：
Step：Rotation process screw rod rises LNG immersed pumps, until the valve element of pump sump bottom valve is in the presence of spring force
With valve seat gluing, sealing, LNG storage tank outlet pressure is then detected to confirm that pump sump bottom valve is closed；
Step：Discharge the LNG liquid storages inside pump sump；Nitrogen or inert gas are passed through into pump sump to be ensured to put forward the peace of pump operation
Quan Xing；
Step：The junction of pump sump and LNG storage tank is dismantled, pump hoist cable will be carried by crane gear and hung out in the lump with pump sump；
Step:The LNG immersed pumps more renewed, inverted order install new immersed pump；
Step：LNG liquid storages inside let-down vessel, the valve seat of pump sump bottom is rotated using instrument, removes and overhauls the well
Bottom valve.
Due to the above method, can ensure LNG immersed pumps can fast quick-detach, pump sump can be carried out it is overall sling,
It is the time to have saved substantial amounts of maintenance, reduces the use cost of LNG storage tank, the design of this mode is to pump sump bottom valve arrangement
Repair time reduce more than 30%, nitrogen is passed through into pump sump or inert gas is cleaned, can effectively prevent can
Combustion gas body leaks, the security that enhancing equipment uses.Personal safety is ensured of, its unloading process is safe.
In summary, by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1st, dismountable LNG storage tank shaft bottom valve has service life length, dismountable feature, can reduce LNG storage tank well
The maintenance cost of bottom valve, improve service efficiency and the life-span of LNG storage tank.
2nd, the present apparatus is simple in construction easy to use, can effectively realize quick assembling and the use of LNG immersed pumps, effectively
Guarantee immersed pump safety in utilization, can effectively improve the disassembly efficiency of immersed pump, reduce LNG storage tank and using process
In maintenance and maintenance cost；
3rd, the hoisting mechanism at the top of pump sump, the LNG immersed pumps can be lifted to a certain extent, so as to control located at pump sump
The pump sump bottom valve opening and closing of bottom, realizes isolating for pump sump and LNG storage tank body under sealed conditions；
4th, its built-in pump type LNG storage tank is that LNG immersed pumps are directly placed in into tank inside, without that will store up when maintenance is changed
Tank interior media empties, and reduces maintenance cost and time；Moreover, pump sump bottom valve is dismantled and assembled, due to the maintenance of LNG immersed pumps once,
Pump sump bottom valve opens and closes once, therefore the service life of pump sump bottom valve is very long, improves service efficiency and the life-span of LNG storage tank.
Brief description of the drawings
Fig. 1 is dismountable LNG storage tank shaft bottom valve arrangement figure in the present invention；
Fig. 2 is LNG storage tank overall structure figure in the present invention；
Fig. 3 is pump sump superstructure figure in the present invention；
Marked in figure：1- LNG storage tanks, 2- pump sumps, 3- go out liquid flexible pipe, 4- mufflers, 5- LNG immersed pumps, 6- pump sumps bottom
Valve, 7- carry pump hoist cable, 8- return-air stop valves, and 9- goes out liquid stop valve, 10- scavenging conduits, 11- valve seats, 12- valve elements, 13- valve base sealings
Part, 14- springs, 15- spring bases, 16- valve element guide pillars, 17- valve seat stopper rings, loop coil under 18- pump sumps, 19- pump sump blind flanges,
20- operates screw rod, 21- pump sump top nuts, 22- rotating hoisting rings.
Embodiment
Below in conjunction with the accompanying drawings, the present invention is described in detail.
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Specific embodiment 1：
As Figure 1-3, dismountable LNG storage tank shaft bottom valve of the invention, including valve seat 11, valve element 12, spring 14, bullet
Spring abutment 15, valve base seal 13 and valve element guide pillar 16, spring base 15 are fixedly connected with the one end of valve element guide pillar 16, valve element guide pillar 16
The other end be fixedly connected through valve element 12 with valve seat 11, valve element 12 is set on valve element guide pillar 16 and its lower end is butted on spring 14
Upper end, the lower end of spring 14 are butted on spring base 15, and the valve base seal for sealing is provided between valve seat 11 and valve element 12
13, the elastic force of spring 14 makes valve element 12 promote valve element 12 with the gluing, sealing of valve seat 11 to external force；Valve seat 11 is arranged on the bottom of pump sump 2
Portion, pump sump 2 are connected in LNG storage tank 1 and stretched into LNG storage tank 1, and loop coil 18 under pump sump is connected with the bottom thread of pump sump 2,
Valve seat 11 is tightly connected with loop coil under pump sump 18.Dismountable LNG storage tank shaft bottom valve has service life length, dismountable special
Point, the maintenance cost of LNG storage tank shaft bottom valve can be reduced, improve service efficiency and the life-span of LNG storage tank 1.Its in the structure
Built-in pump type LNG storage tank 1 is that LNG immersed pumps 5 are directly placed in into tank inside, need not be by tank inside medium when maintenance is changed
Emptying, reduce maintenance cost and time；Because LNG immersed pumps 5 overhaul once, pump sump bottom valve 6 opens and closes once, therefore pump sump bottom valve
6 service life is very long, improves service efficiency and the life-span of LNG storage tank 1, and its valve element 12 is simple in construction, easy-to-use, and its LNG dives
Liquid pump 5 promotes valve element 12 inapplicable when, pump sump 2 is isolated with valve body, this structure can facilitate valve element 12, valve seat
The replacing or maintenance of the part such as 11 and spring 14, improve the efficiency of replacing and the efficiency of maintenance, reduce the use of equipment into
This.
Loop coil 18 is provided with valve seat stopper ring 17 under pump sump, valve seat 11 be placed in valve seat stopper ring 17 and with loop coil under pump sump
18 threaded connections, the junction of loop coil 18 is provided with sealing ring under valve seat stopper ring 17 and pump sump.Valve seat stopper ring 17 can
The position of effective limitation valve seat 11, in the effect that dismounting allows to guide the position of its installation of the rapid alignment of valve seat 11 to improve installation
Rate and the simplification of installation.
Valve seat 11 is provided with pump sump 2, valve element 12 is opened under the Action of Gravity Field of LNG immersed pumps 5, the pump sump 2 and LNG storage tank
1 is detachably connected by bolt.Due to said structure, valve seat 11 is rotated using instrument, the entirety of pump sump 2 can be pulled down, can
The effective disassembly efficiency for improving the bottom valve arrangement of pump sump 2, effectively ensures the quick of its dismounting, can reduce the bottom of pump sump 2
The cost of overhaul of valve arrangement.
The upper end of pump sump 2 is provided with hoisting structure, and the hoisting mechanism, which is connected with, carries pump hoist cable 7, connects in the lower end for carrying pump hoist cable 7
LNG immersed pumps 5 are connect, the hoisting structure liftable is so that LNG immersed pumps 5 promote valve seat 11 to open or make valve element 12 in spring 14
Closed in the presence of elastic force.The hoisting mechanism at the top of pump sump 2, can lift the LNG immersed pumps 5 to a certain extent, so as to control
Set up the pump sump bottom valve 6 in the bottom of pump sump 2 to be opened and closed, realize isolating for pump sump 2 and the body of LNG storage tank 1 under sealed conditions.
Hoisting structure includes pump sump top nut 21, operation screw rod 20, rotating hoisting ring 22, operation screw rod 20 and pump sump top nut
21 threaded connections, the end of operation screw rod 20 are connected by rotating hoisting ring 22 with carrying pump hoist cable 7, and the rotating hoisting ring 22 is used to make to carry
Pump hoist cable 7 can rotate relative to operation screw rod 20.The hoisting structure realizes the lifting of LNG immersed pumps 5 by helicitic texture, can
The effective sealing for ensuring pump sump 2, while more can realize the liftings of LNG immersed pumps 5 in labour-saving, ensure the peace of the present apparatus
Full normal use.
The oral area of pump sump 2 is provided with pump sump blind flange 19, the other end of operation screw rod 20 through pump sump blind flange 19 with
The rotating operation of screw rod 20 easy to operation.Operation screw rod 20 can be advantageous to device through pump sump blind flange 19 and not open pump sump
LNG immersed pumps 5 are lifted in the case of 2, improve the security of LNG storage tank 1, strengthen the overhaul efficiency of the pump sump 2 of LNG storage tank 1.
Muffler 4 is connected with the bottom of pump sump 2, return-air stop valve 8 is provided with muffler 4, one end of the muffler 4
It is communicated in pump sump 2, the other end is communicated in LNG storage tank body 1.Due to its muffler 4 of said structure and return-air stop valve 8,
It can effectively avoid the gas of pump sump 2 excessive and then influence the extraction of LNG immersed pumps 5, it is effective to adjust in pump sump 2 and LNG
Liquid level difference in fluid reservoir body.
Drain pipe is connected with pump sump 2, liquid stop valve is provided with out on drain pipe, in one end of drain pipe and goes out liquid flexible pipe
3 connections, drain pipe have inverted U-bend portion.Its U-bend portion can effectively prevent the liquid in pipeline from flowing backwards, and have
Effect improves the service efficiency and using effect of equipment.
Liquid flexible pipe 3 is provided with out in pump sump 2, the output end of LNG immersed pumps 5 is connected with going out one end of liquid flexible pipe, goes out liquid flexible pipe 3
The other end be communicated to outside LNG storage tank 1.
The scavenging conduit 10 being communicated in pump sump 2 is provided with the top of pump sump 2, purging cut-off is connected with scavenging conduit 10
Valve, drain pipe is connected with pump sump 2, liquid stop valve is provided with out on drain pipe, connected in one end of drain pipe with going out liquid flexible pipe 3
Logical, drain pipe has inverted U-bend portion.It, which purges stop valve, can coordinate scavenging conduit 10 to prevent being cleared up in pump sump 2
Only pump sump 2 is mixed into impurity, influences the security of LNG storage tank 1.Its U-bend portion can effectively prevent the liquid in pipeline
Flow backwards, effectively improve the service efficiency and using effect of equipment.
When in use, pump sump 2 is built in inside to the present apparatus, pump sump 2 built with LNG immersed pumps 5, carry the lower end of pump hoist cable 7 with
LNG immersed pumps 5 connect, and dismountable LNG storage tank shaft bottom valve is housed under the pump sump of the bottom of pump sump 2 at loop coil 18, during normal work,
LNG immersed pumps 5 act on the active force that the gravity of valve element 12 overcomes spring 14, force valve element 12 all the time in top open state, removable
The LNG storage tank shaft bottom valve unloaded is opened；When needing to change LNG immersed pumps 5, LNG immersed pumps 5 act on the gravity of valve element 12 and released
Put, under action from the spring 14, valve element 12 moves up along valve element guide pillar 16, has valve base seal between valve element 12 and valve seat 11
13, after valve element 12 is bonded with valve seat 11, dismountable LNG storage tank shaft bottom valve is closed, and at this moment LNG storage tank 1 is realized close with pump sump 2
Packing is exhausted；If dismountable LNG storage tank shaft bottom valve can not close or seal failure if need to overhaul it or change, empty
Medium and inertia safe gas nitrogen is replaced in LNG storage tank 1, open purging stop valve and pump sump 2 is purged and replaced inertia
Safe gas nitrogen, then open pump sump 2 and cover, removal pumps out liquid flexible pipe 3, it is separated with pump sump 2, finally by crane gear
Pump hoist cable 7 will be carried to hang out in the lump with pump sump 2, take out dismountable LNG storage tank shaft bottom valve finally by inner hexagon spanner is lengthened
Maintenance.Its replaceable valve element 12 of part of pump sump bottom valve 6 and valve base seal 13, this work for changing pump sump bottom valve 6 is in LNG
Immersed pump 5 hangs out what pump sump 2 was carried out afterwards.With medium in safe inert gas replacement LNG storage tank 1, with lengthening tool by valve seat
Stopper ring 17 along the inwall of pump sump 2 take out after, then with lengthening die nut dismountable LNG storage tank shaft bottom valve is unscrewed completely, extremely
It departs from the loop coil 18 of the bottom of pump sump 2, is then again hung out dismountable LNG storage tank shaft bottom valve with lengthening tool, repair and replacement.
Specific embodiment 2：
Dismountable LNG storage tank shaft bottom valve according to specific embodiment 1, its method for dismounting are：
Step 1：Rotation process screw rod 20 rises LNG immersed pumps 5, until the valve element 12 of pump sump bottom valve 6 is in the bullet of spring 14
With the gluing, sealing of valve seat 11 in the presence of power, the outlet pressure of LNG storage tank 1 is then detected to confirm that pump sump bottom valve 6 is closed；
Step 2：Nitrogen or inert gas are passed through into pump sump 2 to exclude the LNG liquid in pump sump 2；Discharge LNG storage tank 1
Internal LNG liquid storages；
Step 3：Pump sump 2 and the junction of LNG storage tank 1 are dismantled, pump hoist cable 7 and pump sump 2 will be carried in the lump by crane gear
Hang out；
Step 4：The pump sump lower valve base 11 of the bottom of pump sump 2 is rotated using instrument, removes and overhauls the shaft bottom valve.
Due to the above method, can ensure LNG immersed pumps 5 can fast quick-detach, overall hang can be carried out to pump sump 2
Rise, it is the time to have saved substantial amounts of maintenance, reduces the use cost of LNG storage tank 1, the design of this mode is to the bottom of pump sump 2
The repair time of valve arrangement reduces more than 30%, and nitrogen is passed through into pump sump 2 or inert gas is cleaned, can be effective
Prevent leaking for fuel gas, the security that enhancing equipment uses.Personal safety is ensured of, its unloading process is safe.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (9)
1. a kind of dismountable LNG storage tank shaft bottom valve, it is characterised in that including valve seat（11）, valve element（12）, spring（14）, bullet
Spring abutment（15）, valve base seal（13）And valve element guide pillar（16）, spring base（15）With valve element guide pillar（16）One end is fixedly connected,
Valve element guide pillar（16）The other end pass through valve element（12）With valve seat（11）It is fixedly connected, valve element（12）It is set in valve element guide pillar（16）
Upper and its lower end is butted on spring（14）Upper end, spring（14）Lower end be butted on spring base（15）On, in valve seat（11）With valve element
（12）Between be provided with for seal valve base seal（13）, spring（14）Elastic force makes valve element（12）With valve seat（11）Gluing, sealing
Valve element is promoted to external force（12）；Valve seat（11）It is arranged on pump sump（2）Bottom, pump sump（2）It is connected to LNG storage tank（1）Go up and stretch
Enter LNG storage tank（1）It is interior, in pump sump（2）Bottom thread be connected with loop coil under pump sump（18）, valve seat（11）With loop coil under pump sump
（18）It is tightly connected.
2. dismountable LNG storage tank shaft bottom valve according to claim 1, it is characterised in that loop coil under the pump sump（18）
It is provided with valve seat stopper ring（17）, valve seat（11）It is placed in valve seat stopper ring（17）It is interior and with loop coil under pump sump（18）Threaded connection,
In valve seat stopper ring（17）With loop coil under pump sump（18）Junction be provided with sealing ring.
3. dismountable LNG storage tank shaft bottom valve according to claim 1, it is characterised in that the pump sump（2）It is interior to be provided with valve
Seat（11）, valve element（12）In LNG immersed pumps（5）Opened under Action of Gravity Field, the pump sump（2）With LNG storage tank（1）Can by bolt
Dismantling connection.
4. dismountable LNG storage tank shaft bottom valve according to claim 3, it is characterised in that the pump sump（2）Upper end is set
There is hoisting structure, the hoisting mechanism, which is connected with, carries pump hoist cable（7）, carrying pump hoist cable（7）Lower end connection LNG immersed pumps（5）, should
Hoisting structure liftable is so that LNG immersed pumps（5）Promote valve seat（11）Open or make valve seat（11）In spring（14）Elastic force
Effect is lower to close.
5. dismountable LNG storage tank shaft bottom valve according to claim 4, it is characterised in that the hoisting structure includes pump
Well top nut（21）, operation screw rod（20）, rotating hoisting ring（22）, operate screw rod（20）With pump sump top nut（21）Threaded connection,
Operate screw rod（20）End pass through rotating hoisting ring（22）With carrying pump hoist cable（7）It is connected, the rotating hoisting ring（22）For making to carry pump
Hoist cable（7）Can be relative to operation screw rod（20）Rotate.
6. dismountable LNG storage tank shaft bottom valve according to claim 5, it is characterised in that in pump sump（2）Oral area set
There is pump sump blind flange（19）, operate screw rod（20）The other end pass through pump sump blind flange（19）In order to operate screw rod（20）Turn
Dynamic operation.
7. dismountable LNG storage tank shaft bottom valve according to claim 3, it is characterised in that the pump sump（2）Inside it is provided with out
Liquid flexible pipe（3）, LNG immersed pumps（5）Output end be connected with one end of drain pipe flexible pipe, go out liquid flexible pipe（3）The other end connection
To LNG storage tank（1）It is outside.
8. dismountable LNG storage tank shaft bottom valve according to claim any one of 1-7, it is characterised in that described in pump sump
（2）Top be provided with and be communicated to pump sump（2）Interior scavenging conduit（10）, scavenging conduit（10）On be connected with purging stop valve, in pump
Well（2）Drain pipe is connected with, liquid stop valve is provided with out on drain pipe, in one end of drain pipe and goes out liquid flexible pipe（3）Connection, goes out
Liquid pipe has inverted U-bend portion.
9. dismountable LNG storage tank shaft bottom valve according to claim 8, it is characterised in that its method for dismounting is：
Step 1：Rotation process screw rod（20）Make LNG immersed pumps（5）Rise, until pump sump bottom valve（6）Valve element（12）In spring
（14）In the presence of elastic force with valve seat（11）Gluing, sealing, then detect LNG storage tank（1）Outlet pressure is to confirm pump sump bottom valve
（6）Close；
Step 2：Discharge pump sump（2）Internal LNG liquid storages；To pump sump（2）Inside it is passed through nitrogen or inert gas and carries pump behaviour to facilitate
The security of work；
Step 3：Dismantle pump sump（2）With LNG storage tank（1）Junction, pump hoist cable will be carried by crane gear（7）With pump sump（2）
Hang out in the lump；
Step 4:The LNG immersed pumps more renewed（5）, by step 3,2,1 inverted orders install new immersed pump；
Step 5：Discharge LNG storage tank（5）Internal LNG liquid storages, pump sump is rotated using instrument（2）The valve seat of bottom（11）, remove
And overhaul the shaft bottom valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511013572.4A CN105465377B (en) | 2015-12-31 | 2015-12-31 | A kind of dismountable LNG storage tank shaft bottom valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511013572.4A CN105465377B (en) | 2015-12-31 | 2015-12-31 | A kind of dismountable LNG storage tank shaft bottom valve |
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| Publication Number | Publication Date |
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| CN105465377A CN105465377A (en) | 2016-04-06 |
| CN105465377B true CN105465377B (en) | 2018-01-02 |
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| CN201511013572.4A Active CN105465377B (en) | 2015-12-31 | 2015-12-31 | A kind of dismountable LNG storage tank shaft bottom valve |
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| US11149703B2 (en) * | 2019-01-25 | 2021-10-19 | China Energy Investment Corporation Limited | Isolation valve for pressurized tank |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3195713B2 (en) * | 1994-05-02 | 2001-08-06 | 昭和飛行機工業株式会社 | Tank lorry bottom valve |
| JP4273254B2 (en) * | 2002-06-25 | 2009-06-03 | Ｓｍｃ株式会社 | Immersion pump with improved start-up discharge performance |
| CN101994689A (en) * | 2009-08-12 | 2011-03-30 | 江西新德工业泵有限责任公司 | Hydraulically-driven deep well double-screw pump |
| CN203906816U (en) * | 2014-06-11 | 2014-10-29 | 常州凯鹏液流器材有限公司 | Pneumatic subsea valve |
| CN104747908A (en) * | 2015-04-14 | 2015-07-01 | 陕西瑞科特种设备技术有限公司 | Online drawable immersed pump system for deep-cooling storage tank |
| CN205260857U (en) * | 2015-12-31 | 2016-05-25 | 成都华气厚普机电设备股份有限公司 | Detachable LNG storage tank shaft bottom valve |
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Address after: 610041 China (Sichuan) pilot Free Trade Zone, No.3, floor 11, building 6, no.599, shijicheng South Road, Chengdu high tech Zone Patentee after: Houpu clean energy Co.,Ltd. Address before: 610041, No. 11, No. 6, No. 599, No. 3 South City Road, Chengdu hi tech Development Zone, Sichuan Patentee before: CHENGDU HUAQI HOUPU HOLDING Co.,Ltd. |
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Address after: No.3, 11th floor, building 6, no.599, shijicheng South Road, Chengdu hi tech Zone, China (Sichuan) pilot Free Trade Zone, Chengdu, Sichuan 610041 Patentee after: Houpu clean energy (Group) Co.,Ltd. Address before: 610041 China (Sichuan) pilot Free Trade Zone No.3, 11th floor, building 6, no.599, shijicheng South Road, Chengdu high tech Zone Patentee before: Houpu clean energy Co.,Ltd. |