CN106768649A - A kind of positive and negative pressure test method of steel storage tank - Google Patents
A kind of positive and negative pressure test method of steel storage tank Download PDFInfo
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- CN106768649A CN106768649A CN201611138591.4A CN201611138591A CN106768649A CN 106768649 A CN106768649 A CN 106768649A CN 201611138591 A CN201611138591 A CN 201611138591A CN 106768649 A CN106768649 A CN 106768649A
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- negative pressure
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- pressure test
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
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Abstract
A kind of positive and negative pressure test method of steel storage tank, including step：Make the L-type communicating pipe being made up of the first standpipe, first level pipe and the U-shaped connecting tube being made up of the second standpipe, the second horizontal tube, the 3rd standpipe, positive and negative pressure controlled valve is housed on the 3rd standpipe, positive and negative pressure controlled valve installation site is determined by P=ρ gh, and h values are installation site；First standpipe is mounted in tank top；Positive pressure test then continues to water filling in storage tank, stops when water level reaches 1m under highest design liquid level, and negative pressure test then stops when water filling highly reaches water level highest liquid level in tank；To water filling in the 3rd standpipe, malleation controlled valve is opened during positive pressure test, close negative pressure switch valve, when water flows out from malleation controlled valve, water filling terminates, when water flows out from negative pressure switch valve during negative pressure test, water filling terminates；Positive pressure test or/and negative pressure test are carried out by drawing.The present invention can just avoid storage tank from being damaged because of improper operation when positive/negative-pressure is tested without personnel's monitoring.
Description
Technical field
Technical field of measurement and test is installed the present invention relates to petrochemical industry steel storage tank, is especially a kind of positive and negative steel storage tank
Pressure test method.
Background technology
It is well known that large-scale storage tank is typically all field fabrication and filling water test, so-called filling water test is exactly the examination that is filled with water
Leakage and foundation settlement survey, height of water level by mechanical discipline according to related specifications and design document depending on, usually storage tank inner chamber
The 3/4 of height, carries out settlement observation record during filling water test, and when height of pouring water reaches 3/4, at least holding 48 is small
When, tank skin ne-leakage and deformation without exception are as qualified.After no problem, positive pressure test is next carried out according to design drawing requirement
Or/and negative pressure test：Positive pressure test be in tank water level reach highest design liquid level under 1m when slow water-filling carry out, using liquid level
Rise the air on compressed tanks inner chamber top, reach boost effect, in the process, when there is over pressure, storage tank is opened rapidly
Upper blind plate or valve make tank inner chamber and atmosphere, make pressure balance；When doing negative pressure test, highly reached by the water filling in storage tank
The method discharged water during to design peak level, makes tank inner chamber produce negative pressure.Above-mentioned negative pressure test is more more dangerous than positive pressure test, example
Such as, if producing negative pressure using the method for discharging water, when discharging water excessive velocities and valve can not be closed in time, it is increased dramatically
Negative pressure can be by tank body to being taken out flat；And for example, there is a water in storage tank inner chamber, and in the case that all mouths of pipe are all forgotten to open, if having
People is ignorant when discharging water, and will also result in tank body and is taken out flat.As can be seen here, above-mentioned positive pressure test or/and have to during negative pressure test
Having professional to guard could carry out safety test to storage tank.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of positive and negative pressure test method of steel storage tank, without professional
Monitoring can just avoid the risk that steel storage tank is damaged when positive/negative-pressure is tested by improper operation.
Technical solution of the invention is to provide a kind of a kind of steel storage tank positive/negative-pressure experiment side with following structure
Method, comprises the following steps：
1) a L-type communicating pipe and a U-shaped connecting tube are made, L-type communicating pipe is by the first standpipe and first level pipe group
Into, U-shaped connecting tube is made up of the second standpipe, the second horizontal tube and the 3rd standpipe, and first level pipe is connected with the second standpipe and communicates,
The length of the 3rd standpipe is the twice of the second standpipe, and malleation controlled valve is up sequentially arranged with and negative pressure is opened from upper on the 3rd standpipe
The installation site of closing valve, malleation controlled valve and negative pressure switch valve calculates formula P=ρ gh to determine according to liquid pressure, formula
In：P is storage tank malleation or negative pressure test value, and ρ is fluid density, and g is acceleration of gravity, and h is liquid height, the h for drawing respectively
Value is the installation site of malleation controlled valve and negative pressure switch valve；
2) bottom of the first standpipe is arranged on flange, then flange is connected with tank top flange, the first standpipe
Inner chamber communicates with storage tank inner chamber；
3) for positive pressure test, then continue on the basis of sedimentation observation water level to the water filling of storage tank inner chamber, when water level in tank
Stop water filling when reaching 1m under highest design liquid level, and for negative pressure test, when water filling highly reaches water level design highest in tank
Stop water filling during liquid level；
4) to water filling in the 3rd standpipe, for positive pressure test, then malleation controlled valve is opened, closes negative pressure switch valve,
When water flows out from malleation controlled valve, water filling terminates, and is then turned off malleation controlled valve, and for negative pressure test, then opens
Negative pressure switch valve, closes malleation controlled valve, and when water flows out from negative pressure switch valve, water filling terminates, and closes negative pressure switch
Valve；
5) positive pressure test or/and negative pressure test are carried out according to design drawing requirement.
The positive and negative pressure test method of a kind of steel storage tank of the present invention, wherein, the installation site of malleation controlled valve is high
Go out step 1) in h values 10mm.
The positive and negative pressure test method of a kind of steel storage tank of the present invention, wherein, the installation site of negative pressure switch valve is high
Go out step 1) in h values 5mm.
After using above structure, compared with prior art, a kind of positive and negative pressure test method of steel storage tank of the invention have with
Lower advantage：During positive pressure test, the gas pressure with storage tank inner chamber gradually increases, the water level meeting in the second standpipe and the 3rd standpipe
Produce liquid level difference, when pressure exceedes setting value, i.e., superpressure when, liquid level difference is maximum, and now, the water in the 3rd standpipe starts to emit
Bubble, the gas in storage tank is discharged in bubbling form, so as to release pressure inside the tank；During negative pressure test, with storage tank inner chamber
Gas pressure is gradually reduced, and the water level in the second standpipe and the 3rd standpipe can also produce liquid level difference, when negative pressure exceedes setting value,
Liquid level difference is maximum, and the water in the second standpipe starts bubbling, and ambient atmos enter in storage tank in bubbling form, storage tank chamber pressure solution
Remove.In sum, when the positive/negative-pressure in storage tank of the invention is tested, in the case where being guarded without professional, it becomes possible to avoid
Steel storage tank causes the risk damaged when positive/negative-pressure is tested because of improper operation, so that it is guaranteed that storage tank is when positive/negative-pressure is tested
Security.
Positive and negative pressure controlled valve is higher by h value 10mm and 5mm respectively, the advantage is that：It is further ensured that pressure of storage tank is tested
Can be normally carried out, increased liquid level difference can preferably keep test pressure, and then fully check the leak source in tank wall.
Brief description of the drawings
Fig. 1 is that L-type communicating pipe and U-shaped connecting tube are mounted in tank roof in the positive and negative pressure test method of a kind of steel storage tank of the invention
Longitudinal cross section structure diagram when on the flange of face.
Specific embodiment
Further is made to a kind of positive and negative pressure test method of steel storage tank of the invention with reference to the accompanying drawings and detailed description
Describe in detail：
As shown in figure 1, in this embodiment, a kind of positive and negative pressure test method of steel storage tank of the invention, including such as
Lower step：
1) a L-type communicating pipe 3 and a U-shaped connecting tube 4 are made, L-type communicating pipe 3 is by the first standpipe 31 and first level
Pipe 30 is constituted, and U-shaped connecting tube 4 is made up of the second standpipe 41, the second horizontal tube 40 and the 3rd standpipe 42, first level pipe 30 and
Two standpipe 41 connection communicate, the length of the 3rd standpipe 42 is the twice of the length of the second standpipe 41, on the 3rd standpipe 42 from it is upper up
It is sequentially arranged with the installation site root of malleation controlled valve 5 and negative pressure switch valve 6, malleation controlled valve 5 and negative pressure switch valve 6
Formula P=ρ gh are calculated according to liquid pressure to determine, in formula：P is storage tank malleation or negative pressure test value, and unit is Pascal (pa), ρ
It is fluid density, unit is kilogram every cubic metre of (kg/m3), g is acceleration of gravity, the newton of value 9.8/kilogram, h is that liquid is high
Degree, the h values for drawing respectively are the installation site of malleation controlled valve 5 and negative pressure switch valve 6；
2) bottom of the first standpipe 31 is arranged on flange 10, then flange 10 is connected with tank top flange, the
The inner chamber of one standpipe 31 communicates with storage tank inner chamber, and accordingly, first level pipe 30, the second standpipe 41, the second horizontal tube 40 and the 3rd are vertical
The inner chamber of pipe 42 also all communicates with storage tank inner chamber；
3) for positive pressure test, then continue on the basis of sedimentation observation water level to the water filling of storage tank inner chamber, when water level in tank
Stop water filling when reaching 1m under highest design liquid level, and for negative pressure test, when water filling highly reaches water level design highest in tank
Stop water filling during liquid level；
4) to water filling in the 3rd standpipe 42, for positive pressure test, then malleation controlled valve 5 is opened, closes negative pressure switch valve
Door 6, when water flows out from malleation controlled valve 5, water filling terminates, and is then turned off malleation controlled valve 5, and for negative pressure test,
Negative pressure switch valve 6 is then opened, malleation controlled valve 5 is closed, when water flows out from negative pressure switch valve 6, water filling terminates, closed
Negative pressure switch valve 6；
5) positive pressure test or/and negative pressure test are carried out according to design drawing requirement.
In order to be further ensured that pressure of storage tank experiment can be normally carried out, the installation site of the malleation controlled valve 5 is high
Go out step 1) in h values 10mm, the installation site of the negative pressure switch valve 6 is higher by step 1) in h values 5mm.Increased liquid
Potential difference value can preferably keep test pressure, and then fully check the leak source in tank wall.
Positive/negative-pressure test value according to storage tank is converted into U-tube both sides liquid level height value, adds respectively on this basis
10mm and 5mm can respectively determine the installation site of malleation controlled valve 5 and negative pressure switch valve 6, the conversion of specific height value
Method is：Formula P=ρ gh are calculated according to liquid pressure, 1000=1.0X10 is drawn3X9.8*h, 1.0X10 here3It is water
Density, calculate h=0.102 meters=10.2 centimetres, i.e. 1KPa be equal to 10.2 centimeter water columns, equal to 102mm water columns, so as to calculate
Go out the installation site of the malleation controlled valve 5 and negative pressure switch valve 6 corresponding to tank test pressure value.
After foundation settlement survey 48 hours and no problem are carried out to storage tank, both can only to storage according to design drawing requirement
Tank carries out positive pressure test, it is also possible to only carry out negative pressure test to storage tank, naturally it is also possible to storage tank is carried out respectively positive pressure test and
Negative pressure test.
Slow water-filling is carried out when positive pressure test water level in the tank reaches 1m under highest design liquid level, is risen using liquid level
The air on compressed tanks inner chamber top, reaches boost effect, and the gas pressure with storage tank inner chamber gradually increases, the He of the second standpipe 41
Water level in 3rd standpipe 42 can produce liquid level difference, if pressure exceedes setting value, i.e., superpressure when, liquid level difference is maximum, now,
Water in 3rd standpipe 42 starts bubbling, and the gas in storage tank is discharged in bubbling form, so as to release pressure inside the tank.
Negative pressure test：The method discharged water when highly reaching design peak level by the water filling in storage tank, produces tank inner chamber
Raw negative pressure, as the gas pressure of storage tank inner chamber is gradually reduced, 42 water level can also be produced in the second standpipe 41 and the 3rd standpipe
Liquid level difference, when negative pressure exceedes setting value, liquid level difference is maximum, and the water in the second standpipe 41 starts bubbling, and ambient atmos are with bubbling
Form enters in storage tank, and storage tank chamber pressure is released.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to model of the invention
Enclose and be defined, on the premise of design spirit of the present invention is not departed from, those of ordinary skill in the art are to technical side of the invention
Various modifications and improvement that case is made, all should fall within the scope of protection of the present invention.
Claims (3)
1. the positive and negative pressure test method of a kind of steel storage tank, it is characterised in that comprise the following steps：
1) a L-type communicating pipe (3) and a U-shaped connecting tube (4) are made, L-type communicating pipe (3) is by the first standpipe (31) and first
Horizontal tube (30) is constituted, and U-shaped connecting tube (4) is made up of the second standpipe (41), the second horizontal tube (40) and the 3rd standpipe (42), the
One horizontal tube (30) is connected with the second standpipe (41) and communicates, and the length of the 3rd standpipe (42) is the twice of the second standpipe (41), the
On three standpipes (42) malleation controlled valve (5) and negative pressure switch valve (6), malleation controlled valve (5) are up sequentially arranged with from upper
Installation site with negative pressure switch valve (6) calculates formula P=ρ gh to determine according to liquid pressure, in formula：P be storage tank malleation or
Negative pressure test value, ρ is fluid density, and g is acceleration of gravity, and h is liquid height, and the h values for drawing respectively are malleation switch valve
The installation site of door (5) and negative pressure switch valve (6)；
2) bottom of the first standpipe (31) is arranged on flange (10), then flange (10) is connected with tank top flange,
First standpipe (31) inner chamber communicates with storage tank inner chamber；
3) for positive pressure test, then continue on the basis of sedimentation observation water level to the water filling of storage tank inner chamber, when water level reaches in tank
Stop water filling during 1m under highest design liquid level, and for negative pressure test, when water filling highly reaches water level design highest liquid level in tank
When stop water filling；
4) to the 3rd standpipe (42) interior water filling, for positive pressure test, then malleation controlled valve (5) is opened, closes negative pressure switch valve
Door (6), when water flows out from malleation controlled valve (5), water filling terminates, and is then turned off malleation controlled valve (5), and for negative pressure
Experiment, then open negative pressure switch valve (6), closes malleation controlled valve (5), when water flows out from negative pressure switch valve (6), note
Water terminates, and closes negative pressure switch valve (6)；
5) positive pressure test or/and negative pressure test are carried out according to design drawing requirement.
2. the positive and negative pressure test method of a kind of steel storage tank according to claim 1, it is characterised in that：The malleation switch valve
Door (5) installation site be higher by step 1) in h values 10mm.
3. the positive and negative pressure test method of a kind of steel storage tank according to claim 2, it is characterised in that：The negative pressure switch valve
Door (6) installation site be higher by step 1) in h values 5mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611138591.4A CN106768649B (en) | 2016-12-12 | 2016-12-12 | A kind of positive and negative pressure test method of steel storage tank |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611138591.4A CN106768649B (en) | 2016-12-12 | 2016-12-12 | A kind of positive and negative pressure test method of steel storage tank |
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| CN106768649A true CN106768649A (en) | 2017-05-31 |
| CN106768649B CN106768649B (en) | 2018-12-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107202690A (en) * | 2017-07-25 | 2017-09-26 | 中建安装工程有限公司 | A kind of breather valve on-site calibration device and its application method |
| CN110032223A (en) * | 2019-04-18 | 2019-07-19 | 安徽皖仪科技股份有限公司 | High-precision positive/negative-pressure is double to apply automatically controlled regulator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110032223A (en) * | 2019-04-18 | 2019-07-19 | 安徽皖仪科技股份有限公司 | High-precision positive/negative-pressure is double to apply automatically controlled regulator |
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| Publication number | Publication date |
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| CN106768649B (en) | 2018-12-11 |
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