CN108317398A - A kind of liquid ethane conveyance conduit pressure protective system and method - Google Patents
A kind of liquid ethane conveyance conduit pressure protective system and method Download PDFInfo
- Publication number
- CN108317398A CN108317398A CN201810203115.9A CN201810203115A CN108317398A CN 108317398 A CN108317398 A CN 108317398A CN 201810203115 A CN201810203115 A CN 201810203115A CN 108317398 A CN108317398 A CN 108317398A
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- pressure
- valve
- pipeline
- conveyance conduit
- bleed
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- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 239000007788 liquid Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000001681 protective effect Effects 0.000 title claims abstract description 16
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 210000002445 nipple Anatomy 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 230000001052 transient effect Effects 0.000 abstract description 5
- 230000008859 change Effects 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 230000006837 decompression Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 206010020852 Hypertonia Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004078 cryogenic material Substances 0.000 description 1
- 238000007599 discharging Methods 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
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000002633 protecting effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pipeline Systems (AREA)
Abstract
The invention discloses a kind of liquid ethane conveyance conduit pressure protective system and method, system includes that throughout main line pump or valve bypass upper parallel arrangement of positive pressure bleed-off system and buffer brake bleed-off system.The present invention will be pumped in liquid ethane pipeline or main line valve event caused by pump or valve before pressure increment, or distance piece pressure increment caused by being increased by temperature, pass through the bleeder installed on exciting pump or valve shunts, automatically it releases into adjacent upstream and downstream main line, enter air to avoid superpressure medium, and limits the highest operating pressure of each pipeline section.The present invention not only eliminates the water attack On The Problem Of Overpressure under pipeline transient operation, medium ground temperature influences that volume change occurs and generates the influence to pipeline strength after also avoiding pipeline shutdown, not discharge system after superpressure medium is released, reduces the investment of affiliated facility, safe and environment-friendly, energy-efficient effect.
Description
Technical field
The present invention relates to a kind of liquid ethane conveyance conduit pressure protective system and methods.
Background technology
In recent years, oil and gas exploitation and petroleum chemical industry are fast-developing, gas condensate field Devoting Major Efforts To Developing, and natural gas is attached
Belong to product extraction process to continue to develop, source, processing and the sale of natural gas liquid hydrocarbon (NGL) increasingly increase.
The chemical composition of liquid ethane is mainly methane, ethane and propane etc., and the molar fraction of wherein ethane can reach
95% or so.Typical liquid ethane mixture bubble point is extremely low (＜ -80 DEG C, normal pressure under), critical-temperature at 25~35 DEG C or so,
Therefore it after leaking, easily vaporizes.Liquid ethane evaporation latent heat is larger, and when volatilization largely absorbs heat, and easily causes exposed population group's jelly
Wound；Meanwhile liquid ethane has higher thermal expansivity.
Currently, the overpressure protection method that common product pipeline uses focuses primarily upon and water attack is arranged to easy superpressure pipeline section position
Bleeder valve and storage tank and use pipeline strength protect both thinkings.Setting water attack release valve is that most direct liquid-phase product is super
Mode of releasing is pressed, medium enters peripheral hardware storage tank through relief valve, and to reduce pipeline pressure, medium stores in storage tank, this mode
With direct protecting effect, bleeder valve automatically turns on after pressure is more than setting pressure；Pipeline strength Protection Code is by pre-
The most extreme pressure that the pipeline first judged may occur, the mode for being considered as improving system design temperature carry out pressure protection,
This mode has feasibility after correctly predicted maximum pressure.
For liquid ethane conveyance conduit, there are respective disadvantages for above two pressure protection method：For water attack release valve
With the method for storage tank, in view of liquid ethane, higher saturated vapor pressure, storage tank need to take design principle with pressure at normal temperatures, this is carried
The high manufacture difficulty and cost of storage tank, while challenge is also proposed safely to storage tank from far-off regions；Pipeline strength is protected
Method, as previously mentioned, correct judge that extreme pressure is the premise of guarantee pipe safety, and for large diameter pipeline, raising is set
Meter pressure may cause piping cost to be substantially improved.
Currently, the thematic water attack about liquid ethane pipeline is released, research is very few, and rational Water Hammer Control method has
It waits furtheing investigate, meanwhile, it is such that there is the temperature compared with high-expansion medium to cause superpressure control measure also to be developed.
Invention content
The shortcomings that in order to overcome the prior art, the present invention provides a kind of liquid ethane conveyance conduit pressure protective system and
Method, with ensure liquid ethane pipeline under extreme operating condition can quick pressure releasing to design operation operating mode, ensure pipe-line system peace
Entirely.
The technical solution adopted in the present invention is：A kind of liquid ethane conveyance conduit pressure protective system, including throughout
Main line pumps or valve bypasses upper parallel arrangement of positive pressure bleed-off system and buffer brake bleed-off system, and in pipe-line system
Upstream and downstream setting superpressure medium reservoirs；The positive pressure bleed-off system includes being arranged in pump charge or valve shunts
Temperature sensor and pressure sensor on pipe nipple, and connect with pump charge or valve shunts pipe nipple ball valve, positive pressure
Bleeder valve and restriction orifice；The buffer brake bleed-off system includes that the temperature being arranged on pump charge or valve shunts pipe nipple passes
Sensor and pressure sensor, and the ball valve, buffer brake bleeder valve and the metering hole that are connect with pump charge or valve shunts pipe nipple
Plate.
The present invention also provides a kind of liquid ethane conveyance conduit pressure protection methods, including following content：
(1) throughout main line pump or the upper parallel setting positive pressure bleed-off system of valve bypass and buffer brake release and are
System, and according to the maximum working pressure being likely to occur in conduit running, set each positive pressure bleeder valve and buffer brake is released
The setting pressure of valve；
(2) when in pipeline the closing of somewhere valve cause water attack, and more than at this when the setting pressure of positive pressure bleeder valve,
Superpressure medium enters downstream line by positive pressure bleeder valve at this；
(3) when in pipeline somewhere there is stopping transportation heating and cause pressure rise, and more than positive pressure bleeder valve at this or anti-
To Pressure Relief Valve setting pressure when, superpressure medium passes through under positive pressure bleeder valve at this or buffer brake bleeder valve enter
Trip or upstream line；
(4) when the downstream or upstream line that receive medium of releasing equally exist the case where valve is closed, and surpass simultaneously
When pressure, then corresponds to positive pressure bleeder valve or buffer brake bleeder valve at the valve and open, superpressure medium goes successively to close on
Pipeline section, until eventually entering into the superpressure medium reservoirs of ductwork upstream and downstream setting.
Compared with prior art, the positive effect of the present invention is：The present invention is analysing in depth liquid ethane pipeline superpressure work
In the case of condition, pressure release bypass is set before and after causing the main line block valve of water attack and isolation of system, to realize pipeline completely most
High pressure is controllable, and medium of releasing enters adjacent tubes, and setting water attack is avoided to release and the functions such as storage facility.The present invention is by liquid
Pumped in ethane pipeline or main line valve event caused by pump or valve before pressure increment, or by temperature increase caused by isolation
Section pressure increment is released automatically by the bleeder installed on exciting pump or valve shunts into adjacent upstream and downstream main line,
Enter air to avoid superpressure medium, and limits the highest operating pressure of each pipeline section；Setting forward direction, reversed bleed-off system, can expire
The pressure balance of pipeline under sufficient pressure oscillation.The present invention is suitable for liquid ethane pipeline system, not only eliminates pipeline wink
Water attack On The Problem Of Overpressure under state operation, medium ground temperature influences that volume change occurs and generates to pipeline after also avoiding pipeline shutdown
The influence of intensity, not discharge system after superpressure medium is released, reduces the investment of affiliated facility, has reached safety, ring
It protects, energy-efficient effect.
Specific manifestation is as follows：
(1) pressure security：
Positive pressure bleed-off system and buffer brake bleed-off system are installed on main line valve bypass line, are carried for main pipeline
Pressure bleed passage after having supplied valve to close, superpressure medium are released through bypass to closing in pipeline；Pressure relief system ensures
Pipeline any time pressure operating conditions are less than pipe design pressure；Ball valve is blocked in setting in bypass, provides periodic calibration pressure
The condition of bleeder valve.
(2) protection is appropriate：
The positive pressure bleed-off system and buffer brake bleed-off system of setting include Pressure Relief Valve and restriction orifice, together
When play the effect of pressure release and current limliting, parallel positive (or reversed) pressure releasing system of setting has further functioned as shunting
Effect, utmostly reduce because bleeder valve return sit the response time it is long caused by upstream pressure excessively reduce.
(3) redundancy is enough：
Parallel positive (or reversed) the pressure releasing system being arranged has larger load margin of releasing, and provides enough
Safety Redundancy.
(4) good economy performance：
Superpressure medium is released to the method for closing on pipeline using bypass, external tank or the raising pipeline of releasing of setting can be removed from
The considerations of design pressure, also saves release tank field fire prevention, safety, the design of management, saves a large amount of human and material resources.
(5) total system cooperates with：
The positive pressure bleed-off system and buffer brake bleed-off system of setting are bypassed mounted on pipeline everywhere main line valve
On, somewhere after overpressure relief, medium of releasing is digested jointly by remaining pipe capacity and initial station (terminal) storage tank.
(6) adjacent channel low temperature is avoided：
The positive pressure bleed-off system and buffer brake bleed-off system of setting let out pressure duct medium under working condition of water hammer
It puts to adjacent tubes, alleviates the problems such as by decompression wave action gas-liquid separation, pipeline low temperature are occurred for adjacent tubes.
Description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein：
Fig. 1 is the schematic diagram of the liquid ethane conveyance conduit pressure protective system of the present invention；
Fig. 2 is the schematic diagram of the liquid ethane conveyance conduit total system pressure protection of the present invention.
Specific implementation mode
A kind of liquid ethane conveyance conduit pressure protective system, as shown in Figure 1, including：Bypass pipe nipple 1, ball valve 2, pressure
Transmitter 3, temperature transmitter 4, positive first row Pressure Relief Valve 5, restriction orifice 6, pressure transmitter 7, temperature transmitter 8,
Ball valve 9, drain valve group 10, ball valve 12, pressure transmitter 13, temperature transmitter 14, positive secondary series Pressure Relief Valve 15, current limliting
Orifice plate 16, pressure transmitter 17, temperature transmitter 18, ball valve 19, drain valve group 20, ball valve 22, pressure transmitter 23, temperature become
Send device 24, buffer brake bleeder valve 25, restriction orifice 26, pressure transmitter 27, temperature transmitter 28, ball valve 29, drain valve group
30。
The schematic diagram of the liquid ethane conveyance conduit total system pressure protection of the present invention is as shown in Fig. 2, in all fronts delivery pipe
The different main lines in road pump or valve (B, C ..., N) at, be respectively provided with such positive pressure bleed-off system and buffer brake release and is
System, constitutes the bypass after superpressure, and upstream connects upstream storage tank A, downstream connection downstream storage tank X.
Wherein：
Ball valve 2, pressure transmitter 3, temperature transmitter 4, positive first row Pressure Relief Valve 5, restriction orifice 6, pressure become
It send device 7, temperature transmitter 8, ball valve 9, drain valve group 10 to form positive first row pressure releasing system a, is responsible for upstream line
100 superpressure medium is released to downstream line 102；Ball valve 12, pressure transmitter 13, temperature transmitter 14, positive secondary series pressure
Power bleeder valve 15, restriction orifice 16, pressure transmitter 17, temperature transmitter 18, ball valve 19, drain valve group 20 form forward direction second
Row pressure releasing system b also is responsible for releasing the superpressure medium of upstream line 100 to downstream line 102.Pacify in bleeder valve downstream
The effect of dress restriction orifice is to control and return the persistently amount of releasing after letting sth. slip by effect in bleeder valve.
Specifically,
1) when main valve 101 is closed, caused by transient state water attack boosting or stopping transportation heating are likely to occur in upstream line 100
Long period boosts, and downstream line 102 is likely to occur transient state water attack decompression, and superpressure medium passes through positive first row pressure releasing system
A and positive secondary series pressure releasing system b are sent into downstream line 102；
2) setting same size may be selected in forward direction first row pressure releasing system a and positive secondary series pressure releasing system b
With the Pressure Relief Valve of setting pressure, it may also set up different size and set the Pressure Relief Valve of pressure, setting pressure can not be high
In the design pressure of main pipeline；
3) forward direction first row pressure releasing system a and positive secondary series pressure releasing system b is online " acting on simultaneously ", no
Consideration is set as " spare each other "；
4) forward direction first row pressure releasing system a and forward direction secondary series pressure releasing system b are when any one row fail, separately
An outer row can meet the needs for superpressure medium of releasing in time in technique；
5) ball valve 2,9,12 and 19 maintains a normally open state, is closed when the replacements such as pipeline section instrument, valve are safeguarded；
6) positive pressure bleed-off system a/b will appear flow blind angle in pipeline normal operation, confirm pole in technology assessment
After end fluids at low temperatures standing is released to equipment and had an impact, electric tracing and heat-insulation system can be used to these pipelines into trip temperature
Compensation.To further decrease power load, pipeline and ball valve can be set between drain interface 10a/10b, 20a/20b, periodically opened
It closes and realizes that pipeline runner is unimpeded, electric tracing is carried out only between Pressure Relief Valve and restriction orifice.
Wherein：
Ball valve 22, pressure transmitter 23, temperature transmitter 24, reversed first row Pressure Relief Valve 25, restriction orifice 26, pressure
Power transmitter 27, temperature transmitter 28, ball valve 29, drain valve group 30 form buffer brake bleed-off system c, are responsible for upstream line
By positive pressure bleed-off system in 100, the superpressure medium back flow excessively released to downstream line 102 is released to upstream line
100, it also is responsible for blocking in downstream line 102 and medium heats up after causing superpressure, medium is released to upstream line 100.It is letting out
Valve upstream installation restriction orifice is put, controls and returns the persistently amount of releasing after letting sth. slip by effect in bleeder valve.
Specifically,
1) when main valve 101 is closed, transient state water attack boosting is likely to occur in upstream line 100, downstream line 102 may
There is transient state water attack decompression, superpressure medium passes through positive first row pressure releasing system a and positive secondary series pressure releasing system b
It is sent into downstream line 102, if occurring excessively releasing, causes 102 hypertonia of downstream line, then superpressure medium passes through buffer brake
Bleed-off system c is sent into upstream line 100, in addition, after downstream line 102 is blocked, if the heating of medium stopping transportation occur causes pressure
After raising, superpressure medium also can be sent into upstream line 100 by buffer brake bleed-off system c；
2) the setting pressure of Pressure Relief Valve can not be higher than the design pressure of main pipeline in buffer brake bleed-off system c；
3) ball valve 22,29 maintains a normally open state, is closed when the replacements such as pipeline section instrument, valve are safeguarded；
4) buffer brake bleed-off system c will appear flow blind angle in pipeline normal operation, confirm in technology assessment extreme
After fluids at low temperatures standing is released to equipment and had an impact, electric tracing and heat-insulation system can be used, these pipelines are mended into trip temperature
It repays.To further decrease power load, pipeline and ball valve can be set between drain interface 30a/30b, pipeline is realized in periodically opening and closing
Runner is unimpeded, and electric tracing is carried out only between Pressure Relief Valve and restriction orifice.
In forward and reverse pressure releasing system, bleeder valve and subsequent pipeline, restriction orifice, valve etc. are according to cryogenic material
Type selecting.
Wherein,
Continuously positive pressure bleed-off system a/b is set at all main line valves of all fronts conveyance conduit and buffer brake is let out
Place system c, setting pressure of releasing must not be higher than the design pressure of main pipeline.The superpressure medium of different location is in all main lines
After valve is closed, upstream initial station or downstream terminal pipeline can be entered by the pressure releasing system that valve bypasses, eventually enters into storage
Tank reaches pressure release purpose.
Specifically, valve bypass pressure relief system can form " access ", utilize main line pipe after pressure is more than setting value everywhere
Road system upstream and downstream storage tank is as the final storage device of overpressure relief.
The invention also discloses a kind of liquid ethane conveyance conduit pressure protection methods, include the following steps：
Step 1: according to the principle that pressure bypass is released, according to cut-out cock position and technique mould everywhere in pipe-line system
Quasi- analysis result determines the maximum working pressure and maximum discharging amount being likely to occur in pipe-line system operation, determines everywhere just
To the setting pressure and relieving capacity of Pressure Relief Valve and buffer brake bleeder valve；
Occur the closing of valve 101 in step 2 (a), pipeline and cause water attack, and the last point pressure of upstream line 100 is more than forward direction
Pressure Relief Valve 5/15 sets pressure and downstream line 102 is because media flow inertia causes pressure to decline, positive pressure bleeder valve
5/15 opens, and superpressure medium is entered by positive first row pressure releasing system a and positive secondary series pressure releasing system b simultaneously
Downstream line 102 sets pressure, then Pressure Relief Valve when the last point pressure of upstream line 100 is less than positive pressure bleeder valve 5/15
5/15 closes, and so on；
If step 2 (b), step 2 (a) simultaneously, along the downstream line 102 when valve opening, into downstream line
102 superpressure medium flows to pipe-line system end point；When valve is also switched off along downstream line 102, downstream line may be caused
102 starting point pressure set pressure higher than buffer brake bleeder valve 25, then buffer brake bleeder valve 25 is opened, and superpressure medium passes through anti-
Enter pipeline 100 to pressure releasing system c, pressure set when 102 starting point pressure of downstream line is less than buffer brake bleeder valve 25,
Then Pressure Relief Valve 25 is closed, and so on, final to realize pipe-line system pressure releasing；
When step 3 (a), valve 101 are closed, and medium is more than because stopping transportation heating causes last point pressure in upstream line 100
Positive pressure bleeder valve 5/15 sets pressure, and positive pressure bleeder valve 5/15 is opened, and superpressure medium passes through positive first row simultaneously
Pressure releasing system a and forward direction secondary series pressure releasing system b enter downstream line 102, when the last point pressure of pipeline 101 is less than just
Pressure is set to Pressure Relief Valve 5/15, then Pressure Relief Valve 5/15 is closed, and so on；
Step 3 (b), step 3 (a) simultaneously, along the downstream line 102 when valve opening, into downstream line 102
Superpressure medium flow to pipe-line system end point；When valve is also switched off along downstream line 102, downstream line 102 may be caused
Starting point pressure sets pressure higher than buffer brake bleeder valve 25, then buffer brake bleeder valve 25 is opened, and superpressure medium passes through reversed
Pressure releasing system c enters upstream line 100, when 102 starting point pressure of downstream line is less than the setting pressure of buffer brake bleeder valve 25
Power, the then closing of Pressure Relief Valve 25 are and so on, final to realize the release of pipe-line system pressure；
Step 4 (a), Step 2: step San Tong method, when valve is closed along main line downstream, except downstream may be caused
102 starting point of pipeline sets pressure higher than buffer brake bleeder valve 25, and superpressure medium enters pipeline by buffer brake bleed-off system c
Other than 101, it is also possible to cause the last point pressure of downstream line 102 to set pressure higher than next place's positive pressure bleeder valve, superpressure is situated between
Matter enters follow-up main line by next place's positive pressure bleed-off system, final to realize pipe-line system overpressure relief.
Claims (10)
1. a kind of liquid ethane conveyance conduit pressure protective system, it is characterised in that：Including throughout main line pump or valve bypass
Upper parallel arrangement of positive pressure bleed-off system and buffer brake bleed-off system, and be arranged in the upstream and downstream of pipe-line system
Superpressure medium reservoirs；The positive pressure bleed-off system includes the temperature sensing being arranged on pump charge or valve shunts pipe nipple
Device and pressure sensor, and the ball valve, positive pressure bleeder valve and the restriction orifice that are connect with pump charge or valve shunts pipe nipple；
The buffer brake bleed-off system includes the temperature sensor and pressure sensor being arranged on pump charge or valve shunts pipe nipple,
And ball valve, buffer brake bleeder valve and the restriction orifice being connect with pump charge or valve shunts pipe nipple.
2. a kind of liquid ethane conveyance conduit pressure protective system according to claim 1, it is characterised in that：The forward direction
Pressure releasing system is parallel arrangement of two sets.
3. a kind of liquid ethane conveyance conduit pressure protective system according to claim 1, it is characterised in that：The forward direction
Pressure releasing system includes the first ball valve, positive pressure bleeder valve, restriction orifice and second set gradually from upstream to downstream
Ball valve.
4. a kind of liquid ethane conveyance conduit pressure protective system according to claim 3, it is characterised in that：In the first ball
Pressure sensor and temperature sensor are set gradually on bypass pipe nipple between valve and positive pressure bleeder valve.
5. a kind of liquid ethane conveyance conduit pressure protective system according to claim 3, it is characterised in that：In metering hole
Pressure sensor and temperature sensor are set gradually on bypass pipe nipple between plate and the second ball valve.
6. a kind of liquid ethane conveyance conduit pressure protective system according to claim 3, it is characterised in that：It is described reversed
Pressure releasing system includes the third ball valve, buffer brake bleeder valve, restriction orifice and the 4th set gradually from downstream to upstream
Ball valve.
7. a kind of liquid ethane conveyance conduit pressure protective system according to claim 6, it is characterised in that：In third ball
Pressure sensor and temperature sensor are set gradually on bypass pipe nipple between valve and buffer brake bleeder valve.
8. a kind of liquid ethane conveyance conduit pressure protective system according to claim 6, it is characterised in that：In metering hole
Pressure sensor and temperature sensor are set gradually on bypass pipe nipple between plate and the 4th ball valve.
9. a kind of liquid ethane conveyance conduit pressure protection method, it is characterised in that：Including following content：
(1) throughout positive pressure bleed-off system and buffer brake bleed-off system is above arranged in main line pump or valve bypass parallel, and
According to the maximum working pressure being likely to occur in conduit running, setting for each positive pressure bleeder valve and buffer brake bleeder valve is set
Constant-pressure；
(2) when in pipeline the closing of somewhere valve cause water attack, and more than at this when the setting pressure of positive pressure bleeder valve, superpressure
Medium enters downstream line by positive pressure bleeder valve at this；
(3) when in pipeline somewhere there is stopping transportation heating and cause pressure rise, and more than positive pressure bleeder valve at this or reversed pressure
When the setting pressure of power bleeder valve, superpressure medium by positive pressure bleeder valve at this or buffer brake bleeder valve enter downstream or
Upstream line；
(4) when the downstream or upstream line that receive medium of releasing equally exist the case where valve is closed, and occur superpressure simultaneously,
Positive pressure bleeder valve or buffer brake bleeder valve at the valve is then corresponded to open, superpressure medium goes successively to close on pipeline section,
Until eventually entering into the superpressure medium reservoirs of ductwork upstream and downstream setting.
10. a kind of liquid ethane conveyance conduit pressure protection method according to claim 9, it is characterised in that：When extreme
Fluids at low temperatures stand to positive pressure bleed-off system or buffer brake bleed-off system release have an impact when, using electric tracing
And heat-insulation system carries out temperature-compensating to pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810203115.9A CN108317398B (en) | 2018-03-13 | 2018-03-13 | Pressure protection system and method for liquid ethane conveying pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810203115.9A CN108317398B (en) | 2018-03-13 | 2018-03-13 | Pressure protection system and method for liquid ethane conveying pipeline |
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| CN108317398A true CN108317398A (en) | 2018-07-24 |
| CN108317398B CN108317398B (en) | 2024-06-07 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109357163A (en) * | 2018-11-23 | 2019-02-19 | 中国石油工程建设有限公司 | A kind of gaseous ethane pipeline shutdown restarts system and method |
| CN109506131A (en) * | 2018-12-17 | 2019-03-22 | 中国石油工程建设有限公司 | A kind of associated gas treatment plant slug flow trapping system and method |
| CN109915731A (en) * | 2019-04-02 | 2019-06-21 | 中国石油工程建设有限公司 | A kind of big drop lpg pipeline pressure protective system and method |
| CN111059471A (en) * | 2019-12-12 | 2020-04-24 | 中国石油工程建设有限公司 | Liquid ethane pipeline valve chamber relief system and method |
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