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GB/T 35451.2-2018: Polypropylene (PP) structure-wall piping systems for underground drainage and sewerage -- Part 2: Polypropylene spirally enwound structure-wall pipes
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Polypropylene (PP) structure-wall piping systems for underground drainage and sewerage -- Part 2: Polypropylene spirally enwound structure-wall pipes
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GB/T 35451.2-2018
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Basic data | Standard ID | GB/T 35451.2-2018 (GB/T35451.2-2018) | | Description (Translated English) | Polypropylene (PP) structure-wall piping systems for underground drainage and sewerage -- Part 2: Polypropylene spirally enwound structure-wall pipes | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G33 | | Classification of International Standard | 83.140.30 | | Word Count Estimation | 30,326 | | Date of Issue | 2018-12-28 | | Date of Implementation | 2019-07-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 35451.2-2018: Polypropylene (PP) structure-wall piping systems for underground drainage and sewerage -- Part 2: Polypropylene spirally enwound structure-wall pipes
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Polypropylene(PP) structure--wall piping systems for underground drainage and sewerage--Part 2. Polypropylene spirally enwound structure--wall pipes
ICS 83.140.30
G33
National Standards of People's Republic of China
Polypropylene (PP) structural wall pipe for buried drainage and sewage
System Part 2. Polypropylene wound structural wall pipe
sewerage-Part 2. Polypropylenespiralyenwoundstructure-walpipes
Published on.2018-12-28
2019-07-01 implementation
State market supervision and administration
China National Standardization Administration issued
Content
Foreword I
1 Scope 1
2 Normative references 1
3 Terms and definitions, symbols and abbreviations 1
4 Material 3
5 Pipe Classification 5
6 Structure type and connection method 5
7 Requirements 7
8 Test method 11
9 Inspection rules 13
10 Marking, transport and storage 15
Appendix A (informative) Polypropylene (PP) material properties 16
Appendix B (informative) Pipe fitting performance and typical structure 17
Appendix C (Normative) Tensile force at the weld and the tensile force test of the welded or welded joints
Appendix D (Normative) Sealing test method for elastomeric sealing joints 21
Reference 27
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 second 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 issuing organization 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. Asia University Group, Fujian Nachuan Pipe Industry Technology Co., Ltd., Yonggao Co., Ltd., Hangzhou Unicom
Industry Co., Ltd., Hebei Yourong Pipe Industry Co., Ltd., Guangdong Baoku Intelligent Pipe Network System Co., Ltd., Gudi Technology Co., Ltd., Jiangsu River
Majing Co., Ltd., Hongsheng Plastic (Hangzhou) Co., Ltd.
The main drafters of this section. Li Yu, Wei Zuoyou, Huang Jian, Chen Yiming, Niu Jianying, Si Yuan, Li Xianmei, Zhou Minwei, Chen Xiaolin, Yu Shichao.
Polypropylene (PP) structural wall pipe for buried drainage and sewage
System Part 2. Polypropylene wound structural wall pipe
1 Scope
This part of GB/T 35451 specifies the polypropylene (PP) wound structural wall pipe (hereinafter referred to as "pipe") for buried drainage and sewage.
And definitions, symbols and abbreviations, materials, pipe classification, structural types and connections, requirements, test methods, inspection rules and signs, transport
And storage.
This section is applicable to polypropylene (PP) resin as the main raw material, and polymer material (usually polypropylene) as the auxiliary support structure.
Structural wall pipe and pipe fittings (or solid wall pipe fittings) which are formed by winding and forming.
This section is applicable to polypropylene winding structural wall pipe systems for non-pressure buried drainage and sewage drainage with long-term use temperature not exceeding 45 °C. test
After considering the chemical resistance and temperature resistance of the material, it can also be used for 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
Plastics -- Determination of tensile properties of plastics - Part 2. Test conditions for moulding and extruded plastics
GB/T 2828.1-2012.Sampling procedures for counting sampling - Part 1. Quantitative inspection by batches
plan
GB/T 2918-1998 Standard environment for conditioning and testing of plastic specimens
GB/T 3682-2018 (all parts) Plastic thermoplastic melt mass flow rate (MFR) and melt volume flow rate
Rate (MVR) determination
GB/T 6111-2018 Determination of internal pressure resistance of thermoplastic piping systems for fluid transport
GB/T 6671-2001 Determination of longitudinal shrinkage of thermoplastic pipes
Plastics -- Determination of tensile properties of thermoplastic pipes - Part 3. Polyolefin pipes
GB/T 8806-2008 Determination of dimensions of plastic parts for plastics piping systems
GB/T 9341-2008 Determination of bending properties of plastics
GB/T 9345.1-2008 Determination of ash - Part 1. General method
GB/T 9647-2015 Determination of the stiffness of thermoplastic pipe rings
GB/T 14152-2001 Test method for resistance to external impact of thermoplastic pipes -
GB/T 18042-2000 Test method for creep ratio of thermoplastic pipes
GB/T 19278-2018 General terms and definitions for thermoplastic pipes, fittings and valves
GB/T 19466.6-2009 Plastic Differential Scanning Calorimetry (DSC) Part 6. Oxidation induction time (isothermal OIT) and oxygen
Determination of induced temperature (dynamic OIT)
GB/T 21873-2008 Specification for interface seals for rubber seals, drains and sewers
3 Terms and definitions, symbols and abbreviations
3.1 Terms and definitions
The following terms and definitions as defined in GB/T 19278-2018 apply to this document.
3.1.1
Winding structural wall pipe spiralyenwoundstructured-walpipes
Structural wall tubing made by a winding process.
Note. The wall structure made by different winding processes is different. For example. A-type structural wall tube (shown in Figure 2), B-type structural wall tube (shown in Figure 3) is usually preheated
The monolithic core mold is wound and the inner wall is smooth.
3.1.2
Fitting fitting
Articles made by secondary processing of thermoformed parts and/or several pipe sections (which can be used with solid walled tubes).
3.1.3
Nominal size DN/ID nominalsizeDN/ID
DN/ID
The nominal size associated with the inner diameter.
3.1.4
Any point outside diameter outsidediameter(atanypoint)
De
The outer diameter measured by the cross section of any point of the pipe.
Note. For structural wall tubing, the outer contour of the cross section may not be circular (eg spiral wound tubes) or circular of equivalent size (eg double wall corrugations)
Tube or structural wall tube with ring ribs), where the outer diameter of the tube is theoretically defined as the smallest cylindrical surface that can accommodate the tube body (excluding the socket)
path. For ease of use, it can also be technically defined as the sum of the inner diameter and the double structural height.
3.1.5
Any point inside diameter insidediameter(atanypoint)
Di
The distance between the line passing the center of the circle and the two intersections of the inner surface of the section in the cross section perpendicular to the axial direction of the pipe member.
3.1.6
Mean inner diameter meininsidediameter
Dim
The arithmetic mean of two or more inner diameter measurements that are perpendicular to each other on the same section.
3.1.7
Any point wall thickness walthickness (atanypoint)
The distance between the inner and outer walls at any point on the pipe or fitting.
Note. For multi-layer tubes or structural wall tubes, the wall thickness of each layer or different parts may have different design values, and the qualifiers may be added to clarify the position of the measurement.
Such as the overall wall thickness, inner wall thickness, outer wall thickness, core wall thickness, reinforcement layer wall thickness and so on.
3.1.8
Structure height constructionheight
Ec
The radial distance between the inner and outer surfaces of the pipe wall (A-shaped structural wall pipe), or between the inner surface of the pipe wall and the top end of the rib (B-shaped structural wall pipe).
3.1.9
Inner wall thickness walthicknessoftheinsidelayer
E4
The wall of the B-shaped pipe has a wall thickness at any point between the ring ribs.
3.1.10
Wall thickness under the inner wall thickness walthicknessoftheinsidelayerunderaholowsection
E5
The wall thickness between the inner wall and the inner surface below the cavity portion of the A-type pipe.
3.1.11
Nominal ring stiffness
SN
The nominal value of the ring stiffness, usually a convenient round integer, represents the minimum specified value of the ring stiffness.
[GB/T 19278-2018, definition 2.4.3]
3.2 symbol
The following symbols apply to this document.
A joint length, or the maximum draw length in the sealed state
Di socket diameter
Dim,min minimum average inner diameter of the socket
De OD
Dem average outer diameter
Di inner diameter
Dim average inner diameter
e pipe wall thickness (excluding structural height)
Ec structure height
E1 socket wall thickness
E2 wall thickness
E3 wall thickness at the seal ring groove
E4 inner wall thickness
E5 inner wall thickness under the cavity part
F The distance between the end of the socket and the effective solder joint
L pipe effective length
L1,min minimum fusion length of fused connection
Design length of Z1 pipe fittings
Design length of Z2 pipe fittings
Design length of Z3 pipe fittings
ρ density
3.3 Abbreviations
The following abbreviations apply to this document.
MFR melt mass flow rate (meltmass-flowrate)
OIT oxidation induction time (oxidationinductiontime)
PP polypropylene
SN nominal ring stiffness (nominalringstiffness)
TIR real impact rate (trueimpactrate)
4 materials
4.1 Raw materials
The raw material is mainly a copolymerized polypropylene (PP-B) base resin, and only additives necessary for improving the properties thereof can be added. Polypropylene tree
The lipid content (mass fraction) should be above 95%.
4.2 Material properties
The raw materials should meet the requirements of Table 1. For other requirements, see Appendix A.
Table 1 Raw material properties
Serial number item
Claim
Basic resin material
Test parameter test method
1 Density ρ/(kg/m3) 895 ≤ ρ ≤ 915 ≤ ≤ ≤ ≤ ≤ test temperature 23 ° C
GB/T 1033.1-2008,
Method A
2 Ash/% ≤1.0 ≤3.0 Test temperature (850±50)°C GB/T 9345.1-2008
3 Flexural modulus/MPa ≥ 1500 ≥ 1500 Test temperature 23 ° C GB/T 9341-2008
4 Tensile strength/MPa ≥ 25 ≥ 25 - - GB/T 1040.2-2006
Hydrostatic strength a
(80 ° C, 140 h)
No damage, no leakage
Test temperature ring
Force test time
80 ° C
4.2MPa
140h
GB/T 6111-2018
Type A sealing joint
Hydrostatic strength a
(95 ° C, 1000 h)
No damage, no leakage
Test temperature ring
Force test time
95 ° C
2.5MPa
1000h
GB/T 6111-2018
Type A sealing joint
Melt mass flow rate /
(g/10min)
≤1.5 ≤1.5
Test temperature
Load quality
230 ° C
2.16kg
GB/T 3682-2018
(all parts)
8 Oxidation induction time/min ≥ 20 ≥ 20 Test temperature.200 ° C GB/T 19466.6-2009
Note. According to different materials and ring stiffness, the flexural modulus is generally between 1500MPa and 1900MPa.
a Should be tested with solid wall tubes made of the same material.
4.3 Melt mass flow rate classification
The melt mass flow rate of the pipe material used for electrofusion welding or extrusion welding is graded as follows.
---A grade. MFR ≤ 0.3g/10min;
---B grade. 0.3g/10min \u003cMFR≤0.6g/10min;
---C grade. 0.6g/10min \u003cMFR≤0.9g/10min;
---D level. 0.9g/10min \u003cMFR≤1.5g/10min。
The manufactured pipe can be subjected to electrofusion welding or extrusion welding only when the raw material melt mass flow rate (MFR) levels are the same or adjacent.
connection.
4.4 Recycling materials
Only the cleaning materials used from the pipes and fittings that meet the requirements of this part of the factory are allowed to be used. Recycled material addition amount (mass point
The number should not exceed 5%.
External recycled materials and recycled materials should not be used.
4.5 elastic sealing ring
The elastic sealing ring should meet the requirements of GB/T 21873-2008.
Note. If a seal ring assembly is required, the components can be made of a polyolefin material.
5 pipe classification
Pipes can be divided into 6 grades according to the nominal ring stiffness, see Table 2.
Table 2 Nominal ring stiffness rating
Level SN2a SN4 SN6.3 SN8 SN12.5 SN16
Nominal ring stiffness/(kN/m2) 2 4 6.3 8 12.5 16
a Only for pipes with DN/ID ≥ 500mm.
6 Structure type and connection method
6.1 Structural form of pipe
6.1.1 Type A structural wall tube
a flat inner and outer surface with a spiral cavity structure separated by continuous threaded ribs between the inner and outer walls (a typical schematic view is shown in Figure 1); or
A spiral hollow tubular structure is embedded between the inner and outer walls (a typical schematic view is shown in Fig. 2). A typical A-shaped structural wall tube is shown in Figure 1 and Figure 2.
Figure 1 Schematic diagram of a typical A-type structural wall tube I
a) A-tube with hollow structure
b) A-tube with multi-layer hollow structure
Note. The hollow tube of the A-type structural wall tube can be a plurality of layers.
Figure 2 Schematic diagram of a typical A-type structural wall tube II
6.1.2 B-type structural wall tube
The inner surface is smooth, and the outer surface is a spiral hollow rib tube, and the socket of the pipe should be wound once. Typical B-shaped structural wall
The tube is shown in Figure 3.
a) Typical B-type structural wall tube schematic I
b) Typical B-type structural wall tube schematic II
Description.
1---support structure.
Note. The hollow tube of the part B4 of the B-type structural wall tube may be a plurality of layers.
Figure 3 Schematic diagram of a typical B-type structural wall tube
6.2 Pipe fittings
The pipe fittings are made by secondary processing of pipes or solid wall pipes complying with the requirements of this part, including elbows, tees and pipe plugs of various connection methods.
Wait. See Appendix B for typical pipe performance and schematics.
6.3 Typical Connection Method
The pipe can be connected by elastic sealing ring, socket welding or extrusion welding. Other connections are also available
the way.
The elastic sealing ring connection is shown in Figure 4.
a) Typical elastic seal connection diagram I
Figure 4 Typical elastic sealing ring connection diagram
b) Typical elastic seal connection diagram II
Figure 4 (continued)
The connection method of the socket fused welding is shown in Figure 5.
Figure 5 Schematic diagram of typical socket fused welding connection
The extrusion welding connection is shown in Figure 6.
Figure 6 Typical extrusion welding connection diagram
7 requirements
7.1 color
The color of the pipe is generally gray, and other colors are agreed upon by the supplier and the buyer.
The surface color of the pipe should be uniform.
7.2 Appearance
The inner and outer surfaces of the A-type structural wall pipe shall be flat, and the inner surface of the B-type structural wall pipe shall be smooth and shall not be uneven. Pipe outer surface or outside
The ribs should be regular. The inner and outer walls should be free of air bubbles and visible impurities, and the joints are not disengaged.
The end face after pipe cutting should be trimmed without burrs.
7.3 Geometric dimensions
7.3.1 Length
The effective length (L) of the pipe is generally 6m, and other lengths are agreed upon by the supplier and the buyer. The length is not allowed to have a negative deviation.
7.3.2 Inner diameter and wall thickness
The minimum average inner diameter of the A and B pipes is dim,min, and the minimum inner wall thickness e5,min under the cavity portion of the A-shaped pipe (see Figure 1, Figure 2), B
The minimum inner wall thickness e4,min (see Figure 3) and the minimum joint length Amin (see Figure 4) of the pipe shall comply with the requirements of Table 3. Electric fusion
The welding length (L1) should not be less than 45mm.
Table 3 Inner diameter, wall thickness and joint length are in millimeters
Nominal size
DN/ID
Minimum average inner diameter
Dim,min
Wall thickness
Type A
E5,min
Type B
E4,min
Minimum joint length a
Amin
200 195 1.1 1.5 54
300 294 1.7 2.0 64
400 392 2.3 2.5 74
500 490 3.0 3.0 85
600 588 3.5 3.5 96
800 785 4.5 4.5 118
1000 985 5.0 5.0 140
1200 1185 5.0 5.0 162
1300 1285 5.0 6.5 -
1400 1385 5.0 7.0 -
1500 1485 5.0 7.5 -
1600 1585 5.0 8.0 -
1700 1685 5.0 8.5 -
1800 1785 5.0 9.0 -
1900 1885 5.0 9.5 -
2000 1985 5.0 10.0 -
2100 2085 5.0 10.0 -
2200 2185 5.0 10.0 -
2300 2285 5.0 10.0 -
2400 2385 5.0 10.0 -
2500 2485 5.0 10.0 -
2600 2585 5.0 10.0 -
2700 2685 5.0 10.0 -
2800 2785 5.0 10.0 -
2900 2885 5.0 10.0 -
3000 2985 5.0 10.0 -
3100 2085 5.0 10.0 -
3200 3185 5.0 10.0 -
Table 3 (continued) Unit is mm
Nominal size
DN/ID
Minimum average inner diameter
Dim,min
Wall thickness
Type A
E5,min
Type B
E4,min
Minimum joint length a
Amin
3300 3285 5.0 10.0 -
3400 3385 5.0 10.0 -
3500 3485 5.0 10.0 -
3600 3585 5.0 10.0 -
a When DN/ID ≥ 600, the minimum joint length can be less than the requirements in Table 3, but the minimum should not be less than 85mm, and the “short socket” is marked on the pipe.
7.3.3 Wall thickness of socket and socket
In the case of a pipe with a solid wall socket and/or a socket, the wall thicknesses e1, min, e2, min and e3, min shall comply with the requirements of Table 4.
Table 4 The minimum wall thickness of the solid wall socket and socket is in millimeters
Nominal size
DN/ID
Minimum socket wall thickness
E1,min
Minimum socket wall thickness
E2,min
Minimum wall thickness at the seal
E3,min
DN/ID ≤ 500 de/41, and ≥ 3.4 (de/41) × 0.9 (de/41) × 0.75
DN/ID >500 12.2 10.4 9.2
7.4 Physical properties
The physical properties of the pipe shall comply with the requirements of Table 5.
Table 5 Physical properties of pipes
Serial number project requirements test parameter test method
1 Density ρ/(kg/m2) 895≤ρ≤920 Test temperature 23°C See 8.4
2 Ash /% ≤3 Test temperature (850±50) °C See 8.5
3 Oxidation induction time/min ≥ 20 Test temperature.200 ° C See 8.6
4 Longitudinal retraction rate a/% ≤2, no delamination, no cracking test temperature (150±2) °C See 8.7
5 Oven test b No delamination at the weld, no crack test temperature (150 ± 2) °C See 8.8
a Only for Type A tubing.
b For B-type pipes only.
7.5 Mechanical properties
The mechanical properties of the pipe shall comply with the requirements of Table 6.
Table 6 Mechanical properties of pipes
Serial number project requirements test parameter test method
Ring stiffness /
(kN/m2)
SN2
SN4
SN6.3
SN8
SN12.5
SN16
≥2
≥4
≥6.3
≥8
≥12.5
≥16
- See 8.9
2 Impact performance /% TIR≤10 - See 8.10
3 ring flexibility
The sample has no delamination, no reverse bending, no cracking, and the sample is along the rib.
The tear length at the beginning of the cut should be less than 0.075 DN/ID
Or 75mm (take smaller value)
30% of deformation, see 8.11
4 Creep ratio /% ≤ 4 - - See 8.12
5 Tensile force at the weld joint/N
DN/ID< 400mm
400mm≤DN/ID< 600mm
600mm≤DN/ID< 800mm
800mm≤DN/ID< 2000mm
2000mm≤DN/ID< 2500mm
DN/ID >2500mm
Minimum tensile force.
Tensile rate 15mm/min See 8.13
7.6 System Suitability
After the pipe is connected to the pipe or pipe, the system suitability test is carried out according to Table 7.
Table 7 System Applicability Requirements
Serial number project test parameter requirements test method
Elastic seal
Connection tightness
Condition B
Deformation at the joint seal. 5%
Pipe deformation. 10%
Temperature. (23 ± 2) ° C
Condition C
DN/ID≤300mm, 2°
400mm≤DN/ID≤
600mm, 1.5°
DN/ID >600mm, 1°
Lower internal hydrostatic 5×10-3 MPa without leakage
Higher internal hydrostatic 5×10-2 MPa without leakage
Internal negative pressure -3×10-2 MPa ≤-2.7×10-2 MPa
Lower internal hydrostatic 5×10-3 MPa without leakage
Higher internal hydrostatic 5×10-2 MPa without leakage
Internal negative pressure -3×10-2 MPa ≤-2.7×10-2 MPa
See 8.14.1
Welding or welding
Joint tension a
Tensile rate 15mm/min
Minimum tensile force should be consistent
Table 5 requirements in Table 6
See 8.14.2
a Suitable for all pipes connected by electrofusion welding or extrusion welding.
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 2918-1998.
The state adjustment time should be no less than 24h; when the pipe DN/ID >500mm, the state adjustment time should be no less than 48h.
8.2 Color and appearance
Visually, the internal light source can be illuminated.
8.3 size
8.3.1 Length
Determined according to GB/T 8806-2008.
8.3.2 Average inner diameter
According to GB/T 8806-2008, the inner diameter of the pipe is measured on the same cross section of the pipe with a measuring instrument with an accuracy of not less than 1 mm.
The measurement is performed once every 45°, and the arithmetic mean of at least 4 measurements is taken. The result is one decimal place.
8.3.3 Wall thickness
According to GB/T 8806-2008, select at least 4 uniform points along the circumference of the pipe, and measure with a precision of not less than 0.02mm.
The wall thickness is small.
8.3.4 Joint length and weld length
Determined according to GB/T 8806-2008.
8.4 Density
According to method A in GB/T 1033.1-2008. The sampling position is anywhere inside the pipe, outer wall or socket end (excluding auxiliary
supporting structure).
8.5 Ash
According to the provisions of Method A of GB/T 9345.1-2008.
8.6 Oxidation induction time
According to GB/T 19466.6-2009 test, the inner wall of the pipe should be sampled.
8.7 Longitudinal retraction rate
8.7.1 Sample
Test according to Method B specified in GB/T 6671-2001. Cut three samples from different parts of a pipe. The length of the sample is
(200 ± 20) mm. When the pipe DN/ID< 400mm, it can be cut into two test pieces of the same size along the axial direction; the pipe DN/ID≥400mm
In time, it can be cut into four (or more) test pieces of the same size along the axial direction.
8.7.2 Test
The sample was placed when the oven temperature was raised to 150 ° C. The samples were placed in contact with each other and not in contact with the oven wall. Waiting oven temperature back
Start timing when rising to 150 ° C, maintain the oven temperature (150 ± 2) ° C, the sample heating time in the oven is as follows.
--- ec ≤ 8mm, 30min;
---ec >8mm, 60min.
8.8 Oven test
8.8.1 Sample
Three sections of the sample were cut from different parts of a pipe, and the length of the sample was (300 ± 20) mm. When the pipe DN/ID< 400mm,
Cut into two specimens of the same size along the axial direction; when the pipe DN/ID ≥ 400mm, it can be cut into four (or more) pieces of the same size along the axial direction.
Test block.
8.8.2 Test procedure
The sample was placed when the oven temperature was raised to 150 ° C. The samples were placed in contact with each other and not in contact with the oven wall. Waiting oven temperature back
Start timing when rising to 150 ° C, maintain the oven temperature (150 ± 2) ° C, the sample heating time in the oven is as follows.
---e4≤8mm, 30min;
---e4 >8mm, 60min.
Note 1. When the sample is placed horizontally, a layer of talc, fine sand or small glass balls can be placed under the sample.
Note 2. After the sample is placed, the oven temperature is returned to the test temperature range within 15 min, ie (150 ± 2) °C.
After heating to the specified time, the sample was taken out from the oven, cooled to room temperature, and examined for cracking and delamination and other defects.
Note 3. Allow the sample to cool in air until it can be touched by hand.
Note 4. Refer to GB/T 8803-2001 for the test method.
8.9 Ring stiffness
Test according to GB/T 9647-2015. When the pipe DN/ID >500mm, take a sample from the pipe and rotate it.
The 120° test was performed once, and the arithmetic mean of the test results was taken three times.
8.10 Impact performance
For samples with pipe DN/ID ≤ 500mm, test according to GB/T 14152-2001. When the pipe DN/ID >500mm, it can be cut
The block was tested. The test block size is. length (200 ± 10) mm, inner chord length (300 ± 10) mm, B-type pipe at least one complete
rib. During the test, the test piece should have an outer surface arc upward, and both ends should be placed horizontally on the bottom plate. The B-shaped pipe ensures that the impact point is the top end of ...
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