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GB/T 35451.1-2017: Polypropylene (PP) structure-wall piping systems for underground drainage and sewerage -- Part 1: Polypropylene double wall corrugated pipes
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Polypropylene (PP) structure-wall piping systems for underground drainage and sewerage -- Part 1: Polypropylene double wall corrugated pipes
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Basic data | Standard ID | GB/T 35451.1-2017 (GB/T35451.1-2017) | | Description (Translated English) | Polypropylene (PP) structure-wall piping systems for underground drainage and sewerage -- Part 1: Polypropylene double wall corrugated pipes | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G33 | | Classification of International Standard | 80.140.30 | | Word Count Estimation | 22,264 | | Date of Issue | 2017-12-29 | | Date of Implementation | 2018-07-01 | | Regulation (derived from) | National Standards Bulletin 2017 No. 32 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | GB/T 35451.1-2017: Polypropylene (PP) structure-wall piping systems for underground drainage and sewerage -- Part 1: Polypropylene double wall corrugated pipes
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Polypropylene (PP) structure-wall piping systems for underground drainage and sewerage--Part 1. Polypropylene double wall corrugated pipes
ICS 80.140.30
G33
National Standards of People's Republic of China
Polypropylene (PP) structural wall pipe for buried drainage and sewage
System Part 1. Polypropylene double wall corrugated pipe
sewerage-Part 1. Polypropylenedoublewalcorrugatedpipes
Released on.2017-12-29
2018-07-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Foreword
GB/T 35451 "Polypropylene (PP) structural wall pipe system for buried drainage and sewage disposal" is divided into two parts.
---Part 1. Polypropylene double wall corrugated pipe;
--- Part 2. Polypropylene winding structural wall pipe.
This part is the first part of GB/T 35451.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
Please note that some of the contents of this document may involve patents. The issuer of this document is not responsible for identifying these patents.
This part was proposed by the China Light Industry Federation.
This part is under the jurisdiction of the National Plastics Standardization Technical Committee (SAC/TC48).
This section drafted by. Yonggao Co., Ltd., Gudi Technology Co., Ltd., Fujian Yatong New Materials Technology Co., Ltd.,
Zhejiang Weixing New Building Materials Co., Ltd., Zhejiang Zhongcai Pipeline Technology Co., Ltd., Hubei Jinniu Pipe Industry Co., Ltd., Guangdong Liansu
Technology Industrial Co., Ltd., Asia Pacific Group Corporation.
The main drafters of this section. Huang Jian, Fu Zhimin, Chen Yu, Li Dazhi, Chen Jianchun, Zheng Wei, Zhang Weifeng, Li Yu, Sun Huan.
Polypropylene (PP) structural wall pipe for buried drainage and sewage
System Part 1. Polypropylene double wall corrugated pipe
1 Scope
This part of GB/T 35451 specifies the polypropylene (PP) double-wall corrugated pipe (hereinafter referred to as "pipe") for buried drainage and sewage.
Language, definitions, symbols and abbreviations, materials, product classification and marking, pipe structure and connection methods, requirements, test methods, inspection rules and targets
Zhi, transportation, storage.
This section is applicable to non-pressure buried drainage sewage polypropylene double-wall corrugated pipe with long-term use temperature not exceeding 45 °C.
Considering the chemical resistance and temperature resistance of the material, it can also be used in the underground drainage drainage pipe without pressure.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
Plastics -- Determination of density of non-foam plastics -- Part 1 . Dipping method, liquid pycnometer method and titration method
Determination of tensile properties of plastics - Part 2. Test conditions for moulding and extruded plastics
GB/T 2828.1. Sampling procedures for sampling by sampling - Part 1 . Batch-to-batch sampling plan, searched by AQL
Standard environment for GB/T 2918 plastic sample conditioning and testing
GB/T 3682 Determination of melt flow rate and melt volume flow rate of thermoplastics
GB/T 6111 Test method for internal pressure resistance of thermoplastic pipes for fluid transportation
GB/T 8806 Plastic pipe system - Determination of dimensions of plastic parts
GB/T 9341 Determination of bending properties of plastics
GB/T 9345.1-2008 Determination of ash - Part 1. General method
GB/T 9647 Determination of the stiffness of thermoplastic pipe rings
GB/T 14152-2001 Test method for resistance to external impact of thermoplastic pipes -
GB/T 18042 Test method for creep ratio of thermoplastic pipes
GB/T 19278-2003 General terms and definitions for thermoplastic pipes, fittings and valves
GB/T 19466.6 Plastic Differential Scanning Calorimetry (DSC) Part 6. Oxidation induction time (isothermal OIT) and oxidative induction
Determination of temperature (dynamic OIT)
GB/T 21873 Rubber seals, drain pipes and sewage pipes for interface seal material specifications
3 Terms and definitions, symbols and abbreviations
3.1 Terms and definitions
The following terms and definitions as defined in GB/T 19278-2003 apply to this document.
3.1.1
Nominal inner diameter
DN/ID
The nominal size associated with the inner diameter.
3.1.2
Average outer diameter meanoutsidediameter
Dem
The value obtained by dividing the outer circumference of the maximum cross section of the tube (excluding the socket) by the π (3.142) is rounded up to 0.1 mm.
3.1.3
Mean inner diameter meininsidediameter
Dim
Two or more (two or more sets) of mutually perpendicular inner diameter arithmetic mean values are measured in the same section of the tubing (excluding the socket).
3.1.4
Mean inner diameter meininsidediameterofasocket
Dim
The arithmetic mean of two or more mutually perpendicular inner diameters is measured in the same section of the socket.
3.1.5
Laminated wall thickness walthicknessoftheinsidelayer(waterwaywalthickness)
The thickness of the pipe wall between the corrugations of the pipe (see Figure 1).
3.1.6
Inner wall thickness walthicknessoftheinsidelayerunderaholowsection
E1
The thickness of any part of the inner wall of the pipe (see Figure 1).
3.1.7
Minimum joint length of the socket minimumlengthofengagementofthesocket
Amin
The minimum allowable value of the length of the joint between the seal and the cylindrical end of the inner wall of the socket (see Figure 2).
3.1.8
Nominal ring stiffness
SN
The nominal value of the stiffness of the tubing ring obtained by rounding is usually a round integer that is easy to use.
[GB/T 19278-2003, definition 6.6]
3.2 symbol
The following symbols apply to this document.
A. joint length
Di. the inner diameter of the socket
Dim. average inner diameter of the socket
DN/ID. nominal size in inner diameter
De. outer diameter
Di. inner diameter
Dim. average inner diameter
e. laminated wall thickness
E1. inner wall thickness
L. effective length of pipe
SN. nominal ring stiffness
3.3 Abbreviations
The following abbreviations apply to this document.
MFR. melt mass flow rate (meltmass-flowrate)
OIT. oxidation induction time (oxidationinduction time)
PP. Polypropylene
PP-B. impact copolymerized polypropylene (polypropyleneblockcopolymer)
TIR. true impact rate (trueimpactrate)
4 materials
4.1 Raw materials
4.1.1 Raw materials should be based on impact-resistant copolymerized polypropylene (PP-B) base resin, which can be added with antioxidants, pigments and UV-resistant to improve pipe properties.
Additives such as wire (UV) stabilizers, polypropylene (PP) resin content (mass fraction) should be above 95%.
4.1.2 The properties of polypropylene (PP) base resin and raw materials shall comply with the requirements of Table 1.
Table 1 Properties of polypropylene base resin and raw materials
Serial number item
Claim
Basic resin raw material
experiment method
Internal pressure resistance (80 ° C, ring stress 4.2 MPa, 140 h) a
Internal pressure resistance (95 ° C, ring stress 2.5 MPa, 1000 h) a
No damage, no leakage, no damage, no leakage
GB/T 6111,
Type A sealing joint
2 Melt mass flow rate (2.16kg, 230 °C)/(g/10min) MFR ≤ 1.5 MFR ≤ 1.5 GB/T 3682
3 Thermal stability (oxidation induction time,.200 ° C, aluminum dish)/min ≥ 20 ≥ 20 GB/T 19466.6
4 Flexural modulus/MPa ≥ 1500 ≥ 1500 GB/T 9341
5 Tensile strength/MPa ≥ 25 ≥ 25 GB/T 1040.2
6 Density/(kg/m3) 895 ~ 910 895 ~ 920
GB/T 1033.1-
2008, Method A
7 Ash/% ≤1.0 ≤3.0 GB/T 9345.1-2008
a Tests should be made with solid walls made of the appropriate materials.
4.2 Recycling materials
It is permissible to use clean reclaimed materials from pipes that are in compliance with this part of the factory. The amount of recycled materials (mass fraction) should not exceed
Over 5%.
4.3 Elastic seals
Elastomeric seals shall comply with the requirements of GB/T 21873.
5 Product Classification and Marking
5.1 Classification
Pipes can be classified into 4 grades according to the nominal ring stiffness classification, as shown in Table 2.
Table 2 Nominal ring stiffness rating
Rating SN8 SN10 SN12.5 SN16
Nominal ring stiffness/(kN/m2) 8 10 12.5 16
5.2 Marking
Double wall corrugated pipe □
Material code
Nominal size
Ring stiffness rating
This part number
Example. PP double-wall corrugated pipe with a nominal inner diameter of 500 mm and a ring stiffness rating of SN8 is marked as.
6 Pipe structure and connection method
6.1 Pipe structure
A typical pipe structure is shown in Figure 1.
Description.
Di --- the inner diameter of the socket;
De --- the outer diameter of the pipe;
Di --- the inner diameter of the pipe;
e --- laminated wall thickness;
E1 --- inner wall thickness;
E2 --- wall thickness of the socket;
L --- effective length of the pipe.
Figure 1 Schematic diagram of pipe structure
6.2 Connection method
Pipes are generally connected by means of inserts with elastic sealing rings. The typical connection is shown in Figure 2. Can also use it
He connected.
Description.
A --- joint length;
Di --- The inner diameter of the socket.
Figure 2 Typical pipe connection diagram
7 requirements
7.1 color
The inner and outer layers of the pipe should be uniform in color. The outer layer of the pipe is generally green, orange-brown or gray, and the inner layer is generally white. other
The color can be agreed between the supplier and the buyer.
7.2 Appearance
No bubbles, depressions, obvious impurities and irregular ripples are allowed on the inner and outer walls of the pipe. Both ends of the pipe should be flat, perpendicular to the axis, and inserted
The mouth is located in the valley area. The outer wall of the tube trough should be tightly welded and there should be no disengagement.
7.3 Geometric dimensions
7.3.1 General
The pipe size is expressed by the nominal inner diameter (DN/ID inner diameter series).
7.3.2 Length
The effective length L of the pipe is generally 6m, and the other lengths are determined by negotiation between the supplier and the buyer. The length is not allowed to have a negative deviation.
7.3.3 Size
The dimensions of the pipe shall comply with the requirements of Table 3, and the minimum average inner diameter of the socket shall not be less than the maximum average outer diameter of the pipe, and the wall thickness of the socket shall not
Less than 75% of the wall thickness of the laminate. Other dimensions are agreed between the supplier and the purchaser or given by the manufacturer.
Table 3 The dimensions of the pipe are in millimeters
Nominal inner diameter
DN/ID
Minimum average inner diameter
Dim,min
Minimum laminated wall thickness
Emin
Minimum joint length of the socket
Amin
Minimum inner wall thickness
E1,min
100 95 1.0 32 1.0
125 120 1.2 38 1.0
150 145 1.3 43 1.0
200 195 1.5 54 1.1
225 220 1.7 55 1.2
250 245 1.8 59 1.4
300 294 2.0 64 1.4
400 392 2.5 74 2.0
500 490 3.0 85 2.2
600 588 3.5 96 2.5
800 785 4.5 118 3.0
1000 985 5.0 140 4.0
1200 1185 5.0 162 4.0
The tolerance of the outer diameter of the pipe shall meet the following requirements.
---dem, min≥0.994×de;
---dem, max≤1.003×de.
Where de is the outer diameter specified by the pipe manufacturer, and the calculation result retains one decimal place.
7.4 Physical and mechanical properties of pipes
The physical and mechanical properties of the pipe shall comply with the requirements of Table 4.
Table 4 Physical and mechanical properties of pipes
Project requirements test method
Density/(kg/m3) 895 ~ 920 See 8.4
Ash /% ≤3 See 8.5
Oxidation induction time (200 ° C, aluminum dish)/min ≥ 20 See 8.6
Ring stiffness/(kN/m2) ≥ the corresponding nominal ring stiffness rating requirements see 8.7
Impact performance (TIR) /% ≤ 10 See 8.8
The inner wall of the flexible sample of the ring is smooth, the inner and outer walls are not broken, and the two walls are not disengaged. See 8.9.
The oven test has no bubbles, no delamination, no cracking, see 8.10
Creep ratio ≤ 4 See 8.11
7.5 System Suitability
When the pipe is connected by elastic sealing ring, the system suitability test shall be carried out according to the requirements of Table 5.
Table 5 System suitability
Project test conditions require test methods
Elastic seal
Sealing
Condition B. Radial deformation
Deformation at the joint seal. 5%
Pipe deformation. 10%
Temperature. (23 ± 2) ° C
Condition C. angular deviation
De≤315, 2°
315 \u003cde≤630,1.5°
630 \u003cde,1°
Temperature. (23 ± 2) ° C
Lower hydrostatic pressure (15min) 0.005MPa no leakage
Higher hydrostatic pressure (15min) 0.05MPa no leakage
Internal negative pressure (15min)-0.03MPa ≤-0.027MPa
Lower hydrostatic pressure (15min) 0.005MPa no leakage
Higher hydrostatic pressure (15min) 0.05MPa no leakage
Internal negative pressure (15min)-0.03MPa ≤-0.027MPa
See 8.12
8 test methods
8.1 Condition adjustment and test environment
Unless otherwise specified, the sample shall be subjected to state adjustment and test in the environment of (23 ± 2) °C according to the provisions of GB/T 2918.
The time should not be less than 24h; when the nominal diameter of the pipe sample is >500mm, the state adjustment time should not be less than 48h.
8.2 Color and appearance
Visual inspection.
8.3 Dimensional measurement
8.3.1 Effective length
According to the position shown in Figure 1, according to the provisions of GB/T 8806, the effective length of the pipe is measured with a gauge with an accuracy of not less than 1 mm.
8.3.2 Average inner diameter
According to the provisions of GB/T 8806, two or more pipes of the same cross section perpendicular to each other are measured with gauges with an accuracy of not less than 1 mm.
The inner diameter value, with its arithmetic mean as the average inner diameter of the tube.
8.3.3 Wall thickness
According to the provisions of GB/T 8806, the wall thickness of the laminate and the inner wall thickness are measured with a gauge having an accuracy of not less than 0.02 mm.
8.3.4 Joint length
As shown in Fig. 2, the joint length was measured with a gauge having an accuracy of not less than 0.02 mm.
8.4 Density
The test was carried out according to Method A of GB/T 1033.1-2008.
8.5 Ash
The test was carried out in accordance with the method of Method A of GB/T 9345.1-2008, and the calcination temperature was 850 °C.
8.6 Oxidation induction time
According to the provisions of GB/T 19466.6, the inner wall of the pipe should be sampled.
8.7 Ring stiffness
Test according to the provisions of GB/T 9647. When the average length of the sample is less than 290mm, a ripple should be added (the average length can be exceeded)
Over 310mm). The cutting point should be in the middle of the trough when sampling.
8.8 Impact performance
8.8.1 Sample
When the nominal diameter of the pipe is ≤500mm, it shall be sampled according to GB/T 14152-2001; when the pipe nominal diameter is >500mm, it can be diced.
experimenting. The size of the sample block is. length (200±10) mm, inner chord length (300±10) mm, and the outer diameter of the sample block should be circular.
On the upper side, the two ends are placed horizontally on the bottom plate, and the impact point should be ensured as the top end of the corrugation.
8.8.2 Test procedure
The test was carried out in accordance with the provisions of GB/T 14152-2001. The hammer type of the drop hammer was d90. Test temperature is (0 ± 1) ° C, with V-type support
Plate, drop weight and impact height are shown in Table 6.
Table 6 Drop weight and impact height
Nominal inner diameter
Mm
Drop hammer quality
Kg
Impact height
Mm
DN/ID≤110 0.5 1600
110 \u003cDN/ID≤125 0.8.2000
125 \u003cDN/ID≤160 1.0.2000
160 \u003cDN/ID≤200 1.6.2000
200 \u003cDN/ID≤250 2.0.2000
250 \u003cDN/ID≤300 2.5.2000
DN/ID >300 3.2.2000
8.8.3 Determination
Visually, the sample was cracked, cracked, or cracked in the inner wall after impact. According to the number of sample damage, GB/T
Figure 2 or Table 5 of 14152-2001 determines the TIR value.
8.9 Ring flexibility
8.9.1 Sample
Take 3 sections of the sample of length (300±20)mm from the same pipe, and both ends should be perpendicular to the axis, if the cutting position is not at the trough.
Extended to the trough.
8.9.2 Test procedure
Tests shall be carried out in accordance with the provisions of GB/T 9647, and the test force shall be continuously increased. When the sample is deformed in the vertical direction, the outer diameter is the original outer diameter.
Immediately unload at 30%, observe whether the inner wall of the sample remains smooth, whether the inner and outer walls are broken, and whether the two walls are disengaged.
8.10 Oven test
8.10.1 Sample
Take 3 sections of pipe (300±20) mm long, and cut the pipe with the nominal inner diameter ≤400mm into two samples of the same size along the axial direction;
When the pipe nominal diameter is >400mm, four samples of the same size are cut along the axial direction.
8.10.2 Test procedure
Set the oven temperature to (150 ± 2) ° C. After the temperature is reached, place the samples in the oven so that they do not touch each other and do not contact the oven wall.
Contact. When the laminated wall thickness e ≤ 8mm, it is placed at (150 ± 2) °C for 30min; when the laminated wall thickness e > 8mm, at the same temperature
After standing for 60 min, it was observed after cooling to room temperature, and the sample was unqualified if delamination, cracking or foaming occurred.
8.11 Creep ratio
Test according to the provisions of GB/T 18042. The test temperature was (23 ± 2) ° C, calculated and extrapolated to a creep ratio of two years.
8.12 System Suitability
According to the provisions of Appendix A.
9 Inspection rules
9.1 Batch
The same specification of pipes produced in the same batch of raw materials, formulas and processes is a batch. When the nominal diameter of the pipe is ≤500mm, the number of batches is
The amount does not exceed 60t. If the production is still less than 60t for 7 days, the batch is 7 days; when the nominal diameter of the pipe is >500mm, the quantity of each batch is not
More than 300t. If the production for 30 days is still less than 300t, the batch will be produced in 30 days.
9.2 Factory inspection
9.2.1 The factory inspection items are ring stiffness, ring flexibility and oven test in 7.1, 7.2, 7.3 and Table 4.
9.2.2 In 7.1, 7.2 and 7.3, except for the laminated wall thickness and the inner wall thickness, the test shall be carried out according to GB/T 2828.1, and the normal test shall be used for sampling.
For the sample plan, take the general inspection level I, the acceptance quality limit (AQL) 4.0, and the values of N, n, Ac, and Re are shown in Table 7.
Table 7 The sampling plan unit is root
batch
Sample size
Qualified judgment number
Ac
Number of unqualified judgments
Re
2~15 2 0 1
16~25 3 0 1
26~90 5 0 1
91~150 8 1 2
151~280 13 1 2
281~500 20 2 3
501~1200 32 3 4
1201~3200 50 5 6
3201~10000 80 7 8
9.2.3 In the samples that pass the 9.2.2 sampling inspection, randomly sample the samples, perform the ring stiffness, ring flexibility and oven test in 7.4;
Three samples were taken from the machine, and the wall thickness and inner wall thickness of 7.3.3 were measured and the minimum value was taken.
9.3 Type test
The type inspection items are all technical requirements items specified in Chapter 7. In general, type inspection is carried out every 3 years.
One of the following situations should be type tested.
a) Trial-type identification of new or old products to the factory;
b) When there are large changes in structure, materials and processes that may affect product performance;
c) when the product is suspended for more than half a year and resumes production;
d) When the factory inspection result is significantly different from the previous type inspection.
9.4 Decision rules
If any of 7.1, 7.2, and 7.3 does not meet the requirements of Table 7, the batch is judged to be unqualified. When one of the other projects fails to meet the target, press
9.2.3 The double-sample is randomly selected from the qualified samples to be re-examined. If it is still unqualified, the batch is judged as unqualified.
10 signs, transportation, storage
10.1 mark
The product should have the following logo.
a) the markings specified in 5.2;
b) the name of the manufacturer;
c) trademark;
d) Date of manufacture.
10.2 Transportation
The product should be covered during loading and unloading, and should not be subjected to severe impact, throwing and heavy pressure.
10.3 Storage
The storage area of the pipe should be flat, the stack should be neat, the stacking height should not exceed 4m, away from the heat source, should not be stored and exposed in the open air.
Appendix A
(normative appendix)
Sealing test method for elastic sealing ring joint
A.1 Overview
This test method specifies three basic test methods for the evaluation of buried thermoplastic pipe systems under selected test conditions.
Sealing performance of elastomeric seal type joints.
A.2 Classification of test methods
A.2.1 General
The test methods are divided into the following three categories.
--- Method 1. Evaluate the sealing performance with a lower internal hydrostatic pressure;
--- Method 2. Evaluate the sealing performance with a higher internal hydrostatic pressure;
--- Method 3. Internal negative pressure (partial vacuum).
A.2.2 Internal hydrostatic test
A.2.2.1 Principle
The specimens assembled with the pipe and/or the pipe fittings were subjected to a specified internal static pressure p1 (method 1) to evaluate the sealing performance. need
When necessary, then add a specified internal static pressure p2 (method 2) to assess its sealing performance (see A.2.2.4.4).
The test pressurization shall be maintained for a specified period of time at which time the joint shall be inspected for leaks (see A.2.2.4.5).
A.2.2.2 Equipment
A.2.2.2.1 End seals
The non-joined ends of the assembled specimen are sealed with appropriate dimensions and using appropriate sealing methods. The device should be fixed in a joint
An axial force is generated on it.
A.2.2.2.2 Hydrostatic source
Connected to the seal at one end and capable of applying and maintaining the specified pressure (see A.2.2.4.5).
A.2.2.2.3 Exhaust valve
It is capable of discharging the gas in the assembled sample.
A.2.2.2.4 Pressure measuring device
It is possible to check whether the test pressure meets the specified requirements (see A.2.2.4).
Note. To reduce the total amount of water used, a sealed tube or mandrel can be placed in the sample.
A.2.2.3 Sample
The sample is assembled from one or more lengths of tubing and/or one or more tubular members, at least one elastomeric sealing ring joint. Tested joint
Assembly should be performed according to the manufacturer's requirements.
A.2.2.4 Test
A.2.2.4.1 Water temperature
The test water temperature was (23 ± 2) °C.
A.2.2.4.2 Installation
The sample was mounted on the test equipment.
A.2.2.4.3 Test record
When testing according to A.2.2.4.4 and A.2.2.4.5, observe whether the sample leaks. And write down any during and at the end of the trial
Leak or not leaking.
A.2.2.4.4 Test pressure
Select the test pressure as follows.
--- Method 1. The lower internal hydrostatic test pressure p1 is 0.005 MPa (1 ± 10%);
--- Method 2. The higher internal hydrostatic test pressure p2 is 0.05 MPa (110%).
A.2.2.4.5 Test method
The assembled sample is filled with water and the air is vented. To ensure temperature uniformity, the tube with a diameter de less than 400 mm should be placed.
For at least 5 min, the thicker tube is placed for at least 15 min. The hydrostatic pressure is gradually increased to the specified test pressure during a period of not less than 5 minutes.
Force p1 or p2 and maintain pressure for at least 15 minutes, or to stop early due to leakage.
A.2.2.4.6 Post-processing
After the required pressure time is completed, the water in the sample is decompressed and discharged.
A.2.3 Internal negative pressure test (partial vacuum)
A.2.3.1 Principle
A sample in which several sections of tubing and/or several pipe fittings are assembled is subjected to a prescribed internal negative pressure (partial vacuum) for a prescribed period of time,
The sealing performance of the joint was evaluated by detecting changes in pressure during this time.
A.2.3.2 Equipme...
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