CN106081399B - Quick repairing method for gas leakage of manhole at bottom of large natural gas spherical tank - Google Patents
Quick repairing method for gas leakage of manhole at bottom of large natural gas spherical tank Download PDFInfo
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- CN106081399B CN106081399B CN201610476171.0A CN201610476171A CN106081399B CN 106081399 B CN106081399 B CN 106081399B CN 201610476171 A CN201610476171 A CN 201610476171A CN 106081399 B CN106081399 B CN 106081399B
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- Prior art keywords
- manhole
- spherical tank
- nitrogen
- natural gas
- gas
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/10—Manholes; Inspection openings; Covers therefor
Abstract
The invention discloses a quick repairing method for gas leakage of a manhole at the bottom of a large natural gas spherical tank. The quick repairing method comprises the steps that the gas pressure inside the spherical tank is reduced; the spherical tank is inflated with a certain amount of nitrogen; the spherical tank stands for certain time to layer nitrogen and natural gas; the characteristic that the nitrogen density is larger than the natural gas density is utilized, and after layering, nitrogen deposits at the bottom of the spherical tank to cover the manhole diameter; and then, a manhole cover plate is opened under the purging of nitrogen, and a gas blocking bag is mounted inside an inner hole of a manhole flange for repairing. According to the quick repairing method, only a part of natural gas inside the spherical tank needs to be diffused, only a small amount of nitrogen is needed to block the manhole for repairing, and after repairing, only the small amount of nitrogen needs to be discharged and wasted, so that on one hand, the defect that the prior art needs relatively long time is overcome, and on the other hand, the utilization amount of nitrogen is greatly decreased, and the repairing cost is greatly reduced.
Description
Technical field
The present invention relates to a kind of large natural gas spherical gasholder, and in particular to a kind of large natural gas spherical gasholder bottom manhole gas leakage
Quick-speed first-aid repair method.
Background technology
Gas company can according to section arrange gas holder station, gas holder station be typically all by large-size spherical tank come saving natural gas,
By spherical tank it is independent or it is in series or in parallel in city, low pressure pipeline convey source of the gas.
The bottom of spherical tank is provided with manhole, and high sealing performance must be kept at manhole when spherical tank is gone into operation.But due to artificial
Assembling reason or put time length into operation it sometimes appear that at manhole gas leakage phenomenon.So must Jing at the manhole of spherical tank
Often inspection is leaked hunting.Overhaul plan must be at once carried out once micro- leakage phenomenon is found, to eliminate safe hidden trouble.
When at present gas holder station finds to have at manhole micro- leakage phenomenon, the method for employing is by the process of sequencing planning method, that is, to stop production
Nitrogen displacement natural gas is used after emptying, again by the operation of sequencing planning method after having rushed to repair.
During the process of sequencing planning method spherical tank is diffused to normal pressure first, then with the natural gas in nitrogen displacement spherical tank, then
The manhole of Spherical Tank and the diffusion valve at top are opened, allows air to put come the nitrogen in tank of changing the shuttle, the exhaust stack at the top of spherical tank
Can start maintenance after place's detection oxygen content is qualified.Also need with nitrogen come displaced air after the completion of maintenance, then use gas replacement
The operating pressure of spherical tank is boosted to after nitrogen.
Although this processing method reliability and security are higher, replace need time is longer and whole process
The natural gas in spherical tank is not only wasted, substantial amounts of nitrogen is also wasted, very big economic loss is caused, emergency repair cost is very high.
The content of the invention
It is an object of the invention to provide the quick-speed first-aid repair method that a kind of emergency repair time is short, nitrogen use level is few, can in guarantee
By saving the cost of overhaul on the basis of property and security.
The invention discloses a kind of quick-speed first-aid repair method of large natural gas spherical gasholder bottom manhole gas leakage, including following step
Suddenly：
（1）, the gas in spherical tank diffused make the gas pressure in spherical tank less than the pressure of gas ductwork；
（2）, from the air inlet pipe of Spherical Tank slowly to nitrogen injection in spherical tank, while the diffusion valve at the top of crack spherical tank is put
Scattered portion of natural gas, makes spherical tank maintain barotropic state, and the injection rate of nitrogen is the 5-10% of spherical tank volume；
（3）, nitrogen noted after close diffusion valve, wait spherical tank in nitrogen and natural gas layering；
（4）, according to manhole size prepare full of nitrogen choke bag, and choke bag outer wall bond drawstring；
（5）, when to detect methane concentration at exhaust stack on Spherical Tank outlet be zero, continue low discharge injection nitrogen
Gas；
（6）, remove manhole flange at connection fastening bolt, open cover plate for manhole while choke bag is filled in into manhole
In, make choke bag back-pressure from spherical tank live manhole, prevent air from entering in spherical tank, choke bag drawstring holds in case its positioning；
（7）, the old sealing gasket and impurity removed on manhole, wiped with clean cloth confirm it is clean；
（8）, squeeze at correspondence manhole wall body on the cover plate for manhole under dismounting and smear a circle fluid sealant, adhere at fluid sealant new
Seal washer, then on seal washer squeeze smear fluid sealant；
（9）, quickly cover plate for manhole is placed at manhole flange while choke bag is pulled out and selects the company of tightening by diagonal
The fastening bolt under dismounting is connect, while stopping the injection of nitrogen；
（10）, detect around the manhole methane concentration be zero confirmation without natural gas leaking after, open on spherical tank outlet
Diffusion valve by the nitrogen discharge in spherical tank, close diffusion valve when methane is detected at diffusion valve；
（11）, by the principle progressively boosted slowly natural gas is injected in spherical tank from the air inlet pipe of Spherical Tank, until pressure
Power rises to the operating pressure of spherical tank, leakage detection at any time in boost process.
The Si Kete fluid sealants that the fluid sealant is produced using An Zhi chemical companies of the U.S..
Spherical tank is diffused and be re-filled with a certain amount of nitrogen after reduction pressure by the present invention, stands certain hour by nitrogen and natural
Gas is layered, and using density of nitrogen the characteristic of natural gas density is more than, and nitrogen is deposited on Spherical Tank and covers in manhole aperture after layering
Cover, cover plate for manhole is then opened under nitrogen purge and loads choke bag in the endoporus of manhole flange again to be keeped in repair.
The portion of natural gas in spherical tank so need to be only diffused, a small amount of nitrogen is also only needed and is rushed to repair blocking manhole, after rush to repair
Need to discharge and waste this small amount of nitrogen.On the one hand overcoming prior art needs the defect of long period, on the other hand saves significantly
The about consumption of nitrogen, so greatly reduce emergency repair cost.
The phenomenon leaked air at manhole is and the manhole because the sealing between cover plate for manhole and manhole flange is gone wrong
Sealing gasket between flange and cover plate for manhole is preferably first bonded on cover plate for manhole or manhole flange, then again by connection
Fastening bolt is tightening.
In order to ensure change sealing gasket after good seal performance and use time is long, so from An Zhi chemical companies of the U.S.
The Si Kete fluid sealants of production.
In order that it is convenient to operation, fluid sealant is first squeezed the inner radius for smearing the correspondence manhole flange in manhole cover version, will
Sealing ring is bonded on cover plate for manhole, then by the joint face of the fluid sealant debanding manhole flange on sealing ring, finally close
It is by adhesive glue and sealing gasket fastening by manhole flange and manhole cover version by bolt and supporting nut before sealing solidification
Integrally.
In order to ensure more preferable fastening effect, when tightening bolt, implemented using the order tightened by diagonal position.
In order to ensure that cover plate for manhole prevents air from entering in spherical tank after pulling down, choke bag is filled in and reversely push down in spherical tank people
Bore open.Simultaneously in order to prevent choke bag from slipping from manhole, it is held from outside manhole in the outer wall bonding drawstring of choke bag.
In a word, the present invention breaks inertial thinking, according to the different the principles of science of two kinds of gas densities, using brand-new maintenance
Mode is keeped in repair to spherical tank manhole gas leakage, and while maintenance time is shortened maintenance cost is substantially reduced.
Specific embodiment
It is 5000m that the present embodiment is used for volume3Spherical tank manhole repairing, a diameter of 600mm of manhole flange, pipe network
Pressure is 0.2MPa.
Concrete operation step is as follows：
1st, the pressure in spherical tank is first passed through the near 0.1MPa of siphon pipe by gas holder station employee, then by exhaust stack diffuse to
0.05MPa；
2nd, maintenance man slowly injects 300 cubic metres of nitrogen from the air inlet pipe of Spherical Tank in spherical tank, while crack ball
The diffusion valve of tank top diffuses portion of natural gas, maintains the barotropic state of spherical tank, nitrogen that the diffusion valve is closed after having noted；
3rd, after waiting about half an hour, methane concentration detection is carried out at the exhaust stack on Spherical Tank outlet, works as actual measurement
When methane concentration is zero, illustrate that nitrogen and natural gas in spherical tank are layered.Because the density of nitrogen is more than the density of natural gas,
Nitrogen is covered at the manhole of Spherical Tank, and natural gas is located above nitrogen and is blocked, it is impossible to run outward from manhole；
4th, the choke bag full of nitrogen is prepared according to manhole internal diameter size, and in an outer wall piece drawstring of bonding of choke bag；
5th, continue the nitrogen of the injection low discharge toward in spherical tank, while removing the flange bolt at manhole, cover plate for manhole is beaten
Open.The moment opened in cover plate for manhole fills in choke bag in manhole, makes choke bag back-pressure from spherical tank live manhole, prevents air
Into in spherical tank, drawstring is held in case its positioning；
6th, maintenance man removes the old sealing gasket and impurity on cover plate for manhole, is wiped several times with clean silk, after confirming totally,
The Si Kete fluid sealants of quick An Zhi chemical companies of the Ji Mo U.S. production of manhole internal diameter size are pressed on cover plate for manhole, smears close squeezing
Sealing glue position is stained with Xinmi City's packing, then controls the Si Ke of Chemical Manufacture by the quick Ji Mo U.S. peace of manhole internal diameter size on Xinmi City's packing
Special fluid sealant.Twice the crowded process for smearing fluid sealant need to be completed in three minutes；
7th, while quick pull-out choke bag cover plate for manhole is placed on manhole flange rapidly, is twisted by the order of diagonal position
Tight bolt simultaneously stops the injection of nitrogen；
8th, when the concentration of methane is detected around manhole is zero confirmation natural gas No leakage by leak detector, spherical tank bottom is opened
Diffusion valve on portion's outlet is by the nitrogen discharge in spherical tank, while it is big that methane concentration is detected at exhaust stack by leak detector
When zero, the diffusion valve is closed.So far end-of-job is rushed to repair in manhole gas leakage；
9th, employee opens the intake valve of Spherical Tank and injects natural gas toward spherical tank in standing, and by 0.3MPa, 0.6MPa,
1.0MPa progressively boosts until the pressure that resumes operation, and each pressure rank carries out leakage detection detection, it is ensured that without natural gas at manhole
Leakage.
Through test, using said method a 5000m is rushed to repair3The manhole of spherical tank, only needs 3.5 hours altogether.And can be with
18 tons of liquid nitrogen is saved, 50,000 yuan are worth, the ten thousand stere of natural gas 2 is saved, 50,000 yuan, when at least also reducing the maintenance of two days are worth
Between.
Claims (2)
1. a kind of quick-speed first-aid repair method of large natural gas spherical gasholder bottom manhole gas leakage, comprises the following steps：
（1）, by the gas pressure in spherical tank diffuse to less than gas ductwork pressure；
（2）, from the air inlet pipe of Spherical Tank slowly to nitrogen injection in spherical tank, while the diffusion valve at the top of crack spherical tank diffuses portion
Divide natural gas, make spherical tank maintain barotropic state, the injection rate of nitrogen is the 5-10% of spherical tank volume；
（3）, nitrogen noted after close diffusion valve, wait spherical tank in nitrogen and natural gas layering；
（4）, prepare according to manhole size the choke bag full of nitrogen, and the outer wall bonding in choke bag prevents the drawing of its positioning
Rope；
（5）, when to detect methane concentration at exhaust stack on Spherical Tank outlet be zero, continue low discharge nitrogen injection；
（6）, remove connection fastening bolt at manhole flange, will be filled with the choke bag of nitrogen while opening cover plate for manhole and fill in
In manhole, make choke bag back-pressure from spherical tank live manhole, prevent air from entering in spherical tank；
（7）, the old sealing gasket and impurity removed on manhole, wiped with clean cloth confirm it is clean；
（8）, squeeze at correspondence manhole wall body on the cover plate for manhole under dismounting and smear a circle fluid sealant, adhere at fluid sealant new close
Seal washer, then squeezes on seal washer and smears fluid sealant, and cover plate for manhole is placed at manhole flange and the company of tightening is selected by diagonal
The fastening bolt under dismounting is connect, while stopping the injection of nitrogen；
（9）, around manhole detect methane concentration；
（10）, the concentration that detects methane be zero, after confirming without natural gas leaking, open diffusion valve on spherical tank outlet by ball
Nitrogen discharge in tank, when detecting methane at the exhaust stack of the diffusion valve connection diffusion valve is closed；
（11）, by the principle progressively boosted slowly natural gas is injected in spherical tank from the air inlet pipe of Spherical Tank, until pressure liter
To the operating pressure of spherical tank, each boost process leakage detection at any time, it is ensured that the methane concentration around manhole is zero.
2. the quick-speed first-aid repair method of large natural gas spherical gasholder bottom manhole gas leakage as claimed in claim 1, it is characterised in that：Institute
State Si Kete fluid sealant of the fluid sealant using the production of An Zhi chemical companies of the U.S..
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610476171.0A CN106081399B (en) | 2016-06-27 | 2016-06-27 | Quick repairing method for gas leakage of manhole at bottom of large natural gas spherical tank |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610476171.0A CN106081399B (en) | 2016-06-27 | 2016-06-27 | Quick repairing method for gas leakage of manhole at bottom of large natural gas spherical tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106081399A CN106081399A (en) | 2016-11-09 |
| CN106081399B true CN106081399B (en) | 2017-05-10 |
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| CN201610476171.0A Active CN106081399B (en) | 2016-06-27 | 2016-06-27 | Quick repairing method for gas leakage of manhole at bottom of large natural gas spherical tank |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6024242A (en) * | 1996-12-24 | 2000-02-15 | Eidson Steel Products, Inc. | Removably insertable internal containment reservoir |
| US9228690B2 (en) * | 2010-03-31 | 2016-01-05 | Emco Wheaton Retail Corporation | Apparatus and method for repairing an existing spill containment manhole |
| CN205312304U (en) * | 2015-12-21 | 2016-06-15 | 谱赛科（江西）生物技术有限公司 | Manhole guard circle |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100071804A1 (en) * | 2008-09-19 | 2010-03-25 | Rowe John W | Liner for spill continment manholes |
-
2016
- 2016-06-27 CN CN201610476171.0A patent/CN106081399B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6024242A (en) * | 1996-12-24 | 2000-02-15 | Eidson Steel Products, Inc. | Removably insertable internal containment reservoir |
| US9228690B2 (en) * | 2010-03-31 | 2016-01-05 | Emco Wheaton Retail Corporation | Apparatus and method for repairing an existing spill containment manhole |
| CN205312304U (en) * | 2015-12-21 | 2016-06-15 | 谱赛科（江西）生物技术有限公司 | Manhole guard circle |
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| Publication number | Publication date |
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| CN106081399A (en) | 2016-11-09 |
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