CN108195527B - Used in nuclear power station high density polyethylene pipe tightness test method - Google Patents
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- CN108195527B CN108195527B CN201810000607.8A CN201810000607A CN108195527B CN 108195527 B CN108195527 B CN 108195527B CN 201810000607 A CN201810000607 A CN 201810000607A CN 108195527 B CN108195527 B CN 108195527B
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- 229920001903 high density polyethylene Polymers 0.000 title claims abstract description 103
- 239000004700 high-density polyethylene Substances 0.000 title claims abstract description 103
- 238000010998 test method Methods 0.000 title claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 79
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 62
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 12
- 230000003020 moisturizing effect Effects 0.000 claims abstract description 4
- 230000007423 decrease Effects 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 4
- 230000007774 longterm Effects 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 8
- 239000004698 Polyethylene Substances 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- -1 polyethylene Polymers 0.000 abstract description 2
- 229920000573 polyethylene Polymers 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The present invention relates to polyethylene pipe measuring technologies, it is desirable to provide a kind of used in nuclear power station high density polyethylene pipe tightness test method.Include: that HDPE pipe to be measured is filled to test pressure by water and continuous voltage rise by water pump, controls rate of pressure rise within the scope of 40~120kPa/min；Pressure maintaining 4h simultaneously makes overpressure maintain test pressure by moisturizing；Then pressure stabilizing 1h records pressure data and draws pressure history figure；Leak test actual pressure drop is obtained according to the ratio of the pressure difference at whole story moment in pressure stabilizing stage and test pressure, when actual pressure drop, which is less than, allows pressure drop, it is qualified to be considered as the leak test of HDPE pipe；When actual pressure drop, which is greater than, allows pressure drop, it is unqualified to be considered as HDPE pipe leak test.Through the invention, can make the leak test of HDPE pipe no longer simply apply steel pipe or other fixed materials, structure pipe testing standard or method, but specific leak test acceptance criteria is formulated according to specific tube material, structure and test environment.
Description
Technical field
The present invention relates to polyethylene (HDPE) pipe measuring technologies, and in particular to a kind of used in nuclear power station high density polyethylene pipe is tight
Close property test method.
Background technique
With rapid development of economy, the non-renewable resources such as petroleum, coal are used by a large amount of exploitations, lead to environmental pollution
Aggravation.Therefore clean energy resource specific gravity is improved, accelerates development the development & construction of the new energy such as nuclear power, it has also become trend of the times.Nuclear power
It stands and usually uses sea water as the coolant of peripheral cooling circuit, but seawater is due to salinity and chloride ion content height, corrosivity
It is very strong.HDPE pipe has superior corrosion resistance, at present in the cooling water of the nuclear power stations such as U.S. Callaway, three, China
It is applied in guard system, can both resist the corrosion of outer surface caused by severe use environment, be also possible to prevent pipe caused by liquid
Interior incrustation and inside corrosion.
HDPE has the characteristic of viscoelasticity, and when pipe bears internal pressure, as time increases, material modulus is gradually reduced, and is led
Tube capacity product is caused to become larger, internal stress strain changes therewith.The process is between relaxation and creep, but due to deflection
Very little, the process can be described with relaxation.By the state equation of water it is found that when one timing of environment temperature, water volume becomes larger
Hydraulic pressure is caused to become smaller.Therefore when HDPE pipe bears internal pressure, even if pipe No leakage occurs, since stress relaxation occurs for HDPE pipe,
Pipe internal pressure also can constantly decline.In addition, inevitably there is micro leakage in the junction of pipe and pipe fitting, also result in pipe
The decline of pressure.Consider operational efficiency and safety factor, used in nuclear power station HDPE pipe have the characteristics that diameter greatly, thickness of pipe wall, put into
Before use, leak test need to be carried out to examine its intensity and tightness.
The formulation of leak test method need to comprehensively consider mechanical property, pressure maintaining and the voltage stabling control of HDPE, test pressure,
Test temperature, pipe structure and pipe allow the factors such as water percolating capacity, complex.Different materials, structure and at a temperature of using identical
Leak test method, measure pipe pressure drop be completely it is different.Although numerous theoretical models and grinding in the prior art
Studying carefully achievement ensure that used in nuclear power station HDPE guard system safety from material, design, manufacture, constructing check and non-destructive testing etc.
Property, but the tightness test method for being directly used in used in nuclear power station HDPE pipe is still not formed.
Summary of the invention
The technical problem to be solved by the present invention is to overcome deficiency in the prior art, provide a kind of used in nuclear power station high density
Polyethylene pipe tightness test method.
In order to solve the technical problem, the technical solution adopted by the present invention is that:
A kind of used in nuclear power station high density polyethylene pipe tightness test method is provided, comprising the following steps:
(1) by the closed at one end of HDPE pipe to be measured, the other end is sequentially connected water pump and water tank by pipeline；It is arranged on pipeline
Shut-off valve, motor-driven valve and pressure sensor, water pump, motor-driven valve and pressure sensor pass through signal wire respectively and are connected to computer, energy
By computer control the start and stop of water pump, motor-driven valve aperture and record the pressure data that pressure sensor detects；
(2) when 1.5 times of pipe design pressure being arranged on computers and are used as test pressure, and rate of pressure rise, pressure maintaining being set
Between and voltage stabling control as control parameter；Then HDPE pipe to be measured is filled to test pressure by water and continuous voltage rise by water pump,
Rate of pressure rise is controlled within the scope of 40~120kPa/min；
(3) pressure maintaining 4h after test pressure, the pressure transmitted by computer according to pressure sensor in pressure maintaining period are boosted to
Data control the aperture of motor-driven valve, by making overpressure maintain test pressure to HDPE pipe moisturizing to be measured；
(4) shut-off valve and water pump of stopping transport, pressure stabilizing 1h are closed after pressure maintaining；Due to loose and pipe leakage, overpressure meeting
Constantly decline, computer record pressure data simultaneously draw pressure history figure；Motor-driven valve and shut-off valve are opened after pressure stabilizing,
Release, emptying HDPE pipe to be measured；
(5) leak test actual pressure is obtained according to the ratio of the pressure difference at whole story moment in pressure stabilizing stage and test pressure
It is qualified to be considered as the leak test of HDPE pipe when actual pressure drop, which is less than, allows pressure drop for drop；Allow when actual pressure drop is greater than
When pressure drop, it is unqualified to be considered as HDPE pipe leak test；
The permission pressure drop of HDPE pipe calculates acquisition in the following manner:
Step A, the modulus E (t) of HDPE pipe any time is calculated
Stretching relaxation test is carried out to sample at different temperature, the relaxation modulus data of HDPE is obtained, utilizes extension
Exponential type empirical equation (1) expresses relaxation modulus, fits the relaxation modulus equation for considering that temperature influences；
In formula, t is test period；E0For initial modulus, E∞For long term modulus, obtained by relaxation modulus data；β and τ
It is constant, 0 < β < 1, τ > 0 are fitted to obtain by data；
Step B, HDPE tube capacity product V is calculatediWith overpressure PiRelationship
DoFor the mean outside diameter of HDPE pipe, δ is average wall thickness, and l is length；End fixed constraint is used on constrained type
It is calculated；
Coefficient C is related with tube material and structure, shown in expression formula such as formula (3):
Size ratio DR=Do/ δ is mean outside diameter DoWith the ratio of average wall thickness δ, E is the modulus of any moment HDPE；V is
Pipe Poisson's ratio, takes 0.45；
Step C, the volume V that HDPE manages interior water is calculatedwWith the pressure P of waterwRelationship
The correlation initial data for obtaining the pressure-volume-temperature of water is gone out shown in formula (4) using Tumlirz equation model
Water state equation:
In formula, D, F are only constant related with temperature, D=598.100+2.300T, F=177.950+1.125T-
0.00745T2；T is temperature, M0For pressure stabilizing stage initial mass.
Water percolating capacity Q is allowed to be modified water state equation using unit length pipe:
T in formula0For dwell time, t1For voltage stabling control, l is the length of HDPE pipe；
Step D, the allowable pressure drop of leak test is calculated
The volume of packing stage finish time HDPE pipe, the i.e. volume of pressure stabilizing stage initial time pipe are found out by formula (2), into
And the mass M of the water of HDPE pipe pressure stabilizing stage initial time is acquired by formula (4)0；Allow to seep water according to the unit length of HDPE pipe
Amount, the pressure of finish time in pressure stabilizing stage is calculated by formula (2) and formula (5), it is pressed with the difference of test pressure and test
Power, which is divided by, obtains HDPE pipe leak test permission pressure drop.
Compared with prior art, the solution have the advantages that:
It 1, by means of the present invention, can be according to the leak test pressure maintaining of HDPE pipe and voltage stabling control, test pressure, examination
It tests temperature, pipe structure and the experimental conditions such as water percolating capacity is allowed to determine test evaluation method.It can make the leak test of HDPE pipe not
Simply apply again steel pipe or other fixed materials, structure pipe testing standard or method, but according to specific tube material, knot
Structure and test environment formulate specific leak test acceptance criteria.
2, the present invention is especially suitable for the customization such as nuclear power station require high (material of different engineerings, structure are different) and
The leak test of the demanding HDPE pipe of antiseep.
Detailed description of the invention
Fig. 1 is HDPE pipe leak test schematic device；
Fig. 2 is HDPE pipe standards relaxation test sample；
Fig. 3 is that HDPE stretches the relaxation modulus data result figure that relaxation test obtains at a different set of temperature；
Fig. 4 is HDPE pipe mechanical simplified model.
Appended drawing reference: 1 HDPE pipe to be measured, 2 pressure sensors, 3 pressure gauges, 4 motor-driven valves, 5 shut-off valves, 6 shut-off valves, 7 meters
Calculation machine, 8 water pumps, 9 water tanks；
Specific embodiment
The present invention provides a kind of used in nuclear power station HDPE pipe tightness test method, for leak test test and test
It receives.
As shown in Figure 1, HDPE pipe leak test device includes HDPE pipe 1 to be measured, pressure sensor 2, pressure gauge 3, electricity
Dynamic valve 4, shut-off valve 5, shut-off valve 6, computer 7, water pump 8, water tank 9.System utilizes pressure sensor 2, motor-driven valve 4, computer 7
The automatic control of experiment process is realized with water pump 8；The real-time of HDPE overpressure is realized using pressure sensor 2 and computer 7
Acquisition, simultaneous display.
The step of specific test method, is as follows:
(1) by the closed at one end of HDPE pipe 1 to be measured, the other end is sequentially connected water pump 8 and water tank 9 by pipeline；On pipeline
Setting shut-off valve 5,6, motor-driven valve 4 and pressure sensor 2, water pump 8, motor-driven valve 4 and pressure sensor 2 are connect by signal wire respectively
To computer 7, the start and stop of water pump 8, the aperture of motor-driven valve 4 can be controlled by computer 7 and records what pressure sensor 2 detected
Pressure data；
(2) when 1.5 times of pipe design pressure being arranged on computer 7 and are used as test pressure, and rate of pressure rise, pressure maintaining being set
Between and voltage stabling control as control parameter；Then by water pump 8 by HDPE pipe 1 to be measured fill water and continuous voltage rise to test pressure
Power controls rate of pressure rise within the scope of 40~120kPa/min；
(3) pressure maintaining 4h after test pressure, the pressure transmitted by computer 7 according to pressure sensor 2 in pressure maintaining period are boosted to
Force data controls the aperture of motor-driven valve 4, by making overpressure maintain test pressure to 1 moisturizing of HDPE pipe to be measured；
(4) shut-off valve and water pump of stopping transport, pressure stabilizing 1h are closed after pressure maintaining；Due to loose and pipe leakage, overpressure meeting
Constantly decline, computer 7 record pressure data and draw pressure history figure；Motor-driven valve 4 and cut-off are opened after pressure stabilizing
Valve 6, release, emptying HDPE pipe 1 to be measured；
(5) leak test actual pressure is obtained according to the ratio of the pressure difference at whole story moment in pressure stabilizing stage and test pressure
It is qualified to be considered as 1 leak test of HDPE pipe when actual pressure drop, which is less than, allows pressure drop for drop；Permit when actual pressure drop is greater than
Perhaps when pressure drop, it is unqualified to be considered as 1 leak test of HDPE pipe；
The permission pressure drop of HDPE pipe 1 calculates acquisition in the following manner:
Step A, the modulus E (t) of HDPE pipe any time is calculated
The pipe with HDPE pipe 1 to be measured with batch is taken, punching press is carried out to it, obtains HDPE pipe standards sample, as shown in Figure 2.
At different temperature, stretching relaxation test is carried out to sample using universal testing machine, obtains the relaxation modulus of effective HDPE
Data.Relaxation modulus is expressed using expanding index type empirical equation (1), is obtained based on the stretching relaxation test under different temperatures
Moduli data, fit consider temperature influence relaxation modulus equation.After relaxation modulus equation determines, any time HDPE's
Known to modulus.
In formula, t is test period；E0For initial modulus, E∞For long term modulus, can be obtained by relaxation modulus data；β and
τ is constant, and 0 < β < 1, τ > 0 can be fitted to obtain by data.
The relaxation modulus data result that HDPE stretching relaxation test obtains under typical different temperatures is as shown in figure 3, pass through
The experimental result can be fitted to obtain the parameters in formula (1).
Step B, HDPE tube capacity product V is calculatediWith overpressure PiRelationship
Mechanical model is used to describe tube capacity product V when HDPE pipe rangeiWith overpressure PiRelationship, need known HDPE pipe 1 to be measured
Structural parameters, load parameter, material property and boundary constraint, HDPE pipe mechanical model to be measured can be reduced to shown in Fig. 4.
The pipe outside diameter and thickness of pipe wall at HDPE pipe different location are measured, the mean outside diameter D of HDPE pipe is obtained after being averagedo
With average wall thickness δ, while HDPE length of tube l is measured；Tube end constrains between end freedom and end fixation, but due to pipe
Constrained type is minimum on leak test pressure drop influence, and the end restraint of practical pipe is partial to end and is fixed, therefore the present invention exists
It is calculated on constrained type using end fixed constraint.
According to conditions above, tube capacity product V can be obtainediWith overpressure PiRelationship, as shown in formula (2).Wherein coefficient C is
Coefficient related with tube material and structure, shown in expression formula such as formula (3).Size ratio DR is mean outside diameter DoWith average wall thickness δ
Ratio, DR=Do/ δ, E are the modulus of any moment HDPE；V is pipe Poisson's ratio, takes 0.45.
Step C, the volume V that HDPE manages interior water is calculatedwWith the pressure P of waterwRelationship
Water state equation is used to describe the volume V of waterwWith the pressure P of waterwRelationship, the pressure-volume-temperature about water
Initial data can be directly acquired from document, then can be fitted effluent state equation, relational expression using using Tumlirz equation
As shown in formula (4).Wherein, D, F are only constant related with temperature, D=598.100+2.300T, F=177.950+1.125T-
0.00745T2；T is temperature, M0For pressure stabilizing stage initial mass.
During test, there is inevitable micro leakage on HDPE pipe to be measured, calculating need to consider HDPE pipe leakage with
Pipe stress relaxation influences each other, therefore need to be modified to formula (4).Pipe, which leaks available units length pipe, allows water percolating capacity Q table
Show, consider the influence of pipe leakage, can be obtained shown in revised water state equation such as formula (5), t in formula0For dwell time, t1Surely
It presses the time, l is the length of HDPE pipe.
Step D, the allowable pressure drop of leak test is calculated
Due to the interaction and compatibility of deformation relationship of HDPE Guan Yushui, during leak test, any moment tube capacity
Product ViWith overpressure PiWith the volume V of waterwWith the pressure P of waterwIt is consistent.Boosting and release time are shorter, can not consider,
Determine that HDPE pipe leak test allowable pressure drop mainly considers pressure maintaining and pressure stabilizing stage.Packing stage, by 8 moisturizing of water pump to tie up
It holds that overpressure is constant, the volume of packing stage finish time pipe, the i.e. appearance of pressure stabilizing stage initial time pipe is found out by formula (2)
Product, and then acquire by formula (4) mass M of the water of pipe pressure stabilizing stage initial time0.The mass M of pressure stabilizing stage initial time water0?
Know, according to the unit length of HDPE pipe allow water percolating capacity, by formula (2) and formula (5) by can be calculated the pressure stabilizing stage at the end of
The difference and test pressure of it and test pressure are divided by and obtain HDPE pipe leak test permission pressure drop by the pressure at quarter.
Embodiment:
The used in nuclear power station HDPE pipe leak test test provided according to the present invention and evaluation method, can be to length 1km's
It is laid with the HDPE pipe completed and carries out leak test.If the HDPE of the Duan Guanwei outer diameter 762mm, DR9 are managed, test pressure is
2.60MPa, 23 DEG C of on-the-spot test temperature, step described in method (1) to step (4), can be obtained actual pressure drop according to the present invention.
The permission pressure drop process in accordance with the present invention (5) of HDPE pipe obtains:
Step A, the modulus E (t) of HDPE pipe any time is calculated
At the scene at 23 DEG C of test temperature, the relaxation modulus data of acquisition are fitted, can be obtained HDPE pipe it is any when
The modulus at quarter are as follows:
In formula, t is test period, unit h；E (t) is the modulus of HDPE pipe any time, units MPa；
Step B, HDPE tube capacity product V is calculatediWith overpressure PiRelationship
According to on-the-spot test condition it is found that outer diameter tube Do=762mm, wall thickness δ are=84.7mm, length l=1km；Pipe
Road size ratio DR=9；Poisson's ratio v=0.45.HDPE tube capacity product V can be obtained according to above each parameteriWith overpressure PiRelationship
Are as follows:
In formula, ViFor HDPE tube capacity product, unit mm3；PiFor overpressure, units MPa；E is any moment pipe die amount, can
It is obtained by formula (6) substitution current time, units MPa.
Step C, the volume V that HDPE manages interior water is calculatedwWith the pressure P of waterwRelationship
The correlation initial data for obtaining the pressure-volume-temperature of water intaking utilizes Tumlirz at 23 DEG C of test temperature
Equation model effluent state equation are as follows:
In formula, VwThe volume of interior water, unit mm are managed for HDPE3；PwFor the pressure of water, units MPa；M0For at the beginning of the pressure stabilizing stage
Prothyl amount, unit g.
Consider that pipe has leakage, pipe unit length allows water percolating capacity Q=30L/ (hkm), allows using unit length pipe
Water percolating capacity is modified water state equation:
Step D, the allowable pressure drop of leak test is calculated
Packing stage finish time, t=4 are found out the volume V of HDPE pipe by formula (6), (7)iIt is 2.869 × 1011mm3；Pipe
Volume it is consistent with the volume of water, substituted into the mass M that formula (8) finds out pressure stabilizing stage initial time water0It is 2.858 × 108g。
Pressure stabilizing stage initial time, t=5, according to formula (7), (9), pressure stabilizing stage finish time pressure, which is calculated, by numerical value is
2.54MPa, its difference with test pressure 2.60MPa, which is divided by with test pressure, to be obtained HDPE pipe leak test and allows to press
Power is reduced to 2.3%.
If actual pressure drop is qualified less than the leak test of 2.3%, HDPE pipe；If actual pressure drop is greater than 2.3%,
HDPE pipe leak test is unqualified, need to check whether junction is damaged with the presence or absence of leakage or tubing.
Claims (1)
1. a kind of used in nuclear power station high density polyethylene pipe tightness test method, which comprises the following steps:
(1) by the closed at one end of HDPE pipe to be measured, the other end is sequentially connected water pump and water tank by pipeline；Cut-off is set on pipeline
Valve, motor-driven valve and pressure sensor, water pump, motor-driven valve and pressure sensor pass through signal wire respectively and are connected to computer, can pass through
The start and stop of computer control water pump, the aperture of motor-driven valve simultaneously record the pressure data that pressure sensor detects；
(2) 1.5 times of pipe design pressure are arranged on computers and are used as test pressure, and be arranged rate of pressure rise, the dwell time and
Voltage stabling control is as control parameter；Then HDPE pipe to be measured is filled by water by water pump and continuous voltage rise is to test pressure, controlled
Rate of pressure rise is within the scope of 40~120kPa/min；
(3) pressure maintaining 4h after test pressure, the pressure data transmitted by computer according to pressure sensor in pressure maintaining period are boosted to
The aperture of motor-driven valve is controlled, by making overpressure maintain test pressure to HDPE pipe moisturizing to be measured；
(4) shut-off valve and water pump of stopping transport, pressure stabilizing 1h are closed after pressure maintaining；Due to loose and pipe leakage, overpressure can be continuous
Decline, computer record pressure data simultaneously draw pressure history figure；Motor-driven valve and shut-off valve are opened after pressure stabilizing, are unloaded
It presses, empty HDPE pipe to be measured；
(5) leak test actual pressure drop is obtained according to the ratio of the pressure difference at whole story moment in pressure stabilizing stage and test pressure,
When actual pressure drop, which is less than, allows pressure drop, it is qualified to be considered as the leak test of HDPE pipe；Allow to press when actual pressure drop is greater than
When power drops, it is unqualified to be considered as HDPE pipe leak test；Wherein, the permission pressure drop of HDPE pipe calculates in the following manner obtains
:
Step A, the modulus E (t) of HDPE pipe any time is calculated
Stretching relaxation test is carried out to sample at different temperature, the relaxation modulus data of HDPE is obtained, utilizes expanding index
Type empirical equation (1) expresses relaxation modulus, fits the relaxation modulus equation for considering that temperature influences；
In formula, t is test period；E0For initial modulus, E∞For long term modulus, obtained by relaxation modulus data；β and τ is normal
Number, 0 < β < 1, τ > 0 are fitted to obtain by data；
Step B, HDPE tube capacity product V is calculatediWith overpressure PiRelationship
DoFor the mean outside diameter of HDPE pipe, δ is average wall thickness, and l is length；It is carried out on constrained type using end fixed constraint
It calculates；
Coefficient C is related with tube material and structure, shown in expression formula such as formula (3):
Size ratio DR=Do/ δ is mean outside diameter DoWith the ratio of average wall thickness δ, E is the modulus of any moment HDPE；V is pipe pool
Loose ratio, takes 0.45；
Step C, the volume V that HDPE manages interior water is calculatedwWith the pressure P of waterwRelationship
The correlation initial data for obtaining the pressure-volume-temperature of water, goes out water shown in formula (4) using Tumlirz equation model
State equation:
In formula, D, F are only constant related with temperature, D=598.100+2.300T, F=177.950+1.125T-
0.00745T2；T is temperature, M0For pressure stabilizing stage initial mass；
Water percolating capacity Q is allowed to be modified water state equation using unit length pipe:
T in formula0For dwell time, t1For voltage stabling control, l is the length of HDPE pipe；
Step D, the allowable pressure drop of leak test is calculated
The volume of packing stage finish time HDPE pipe, the i.e. volume of pressure stabilizing stage initial time pipe, Jin Eryou are found out by formula (2)
Formula (4) acquires the mass M of the water of HDPE pipe pressure stabilizing stage initial time0；Allow water percolating capacity according to the unit length of HDPE pipe, by
The pressure of finish time in pressure stabilizing stage is calculated in formula (2) and formula (5), and the difference of it and test pressure is divided by with test pressure
Obtaining HDPE pipe leak test allows pressure drop.
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| CN110207900B (en) * | 2019-06-17 | 2021-08-13 | 湖南省宝满科技开发有限公司 | Method for detecting expansion of heat conduction copper pipe in fan coil |
| CN113324705A (en) * | 2021-04-23 | 2021-08-31 | 国网天津市电力公司电力科学研究院 | Gas turbine unit valve tightness test method |
| CN114486110A (en) * | 2021-12-23 | 2022-05-13 | 广州高澜节能技术股份有限公司 | Functionality test method and system for wind power water cooling device |
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