HG/T 3690-2001 Industrial steel skeleton polyethylene plastic composite pipe
Some standard content:
ICS71.120;83.140
Chemical Industry Standard of the People's Republic of China
HG/T3690~3691—2001
Industrial Steel Frame
Polyethylene Plastic Composite Pipe and Fittings
2002-01-24 Issued
2002-07-01 Implementation
National Economic and Trade Commission Issued
HG/T3690—2001 Industrial Steel Frame Polyethylene Plastic Composite Pipe HG/T36912001 Industrial Steel Frame Polyethylene Plastic Composite Pipe Fittings Record
Record No.: 10168—2002
HG/T3690—2001
This standard is formulated in light of my country's national conditions. Former
This standard was proposed by the Policy and Regulations Department of the former State Administration of Petroleum and Chemical Industry. This standard is under the jurisdiction of the National Technical Committee for Standardization of Non-metallic Chemical Equipment. The drafting units of this standard are: Standardization Research Institute of the Ministry of Chemical Industry, Huachuang Tianyuan Industrial Development Co., Ltd., and Xinghe Industrial Co., Ltd. The main drafters of this standard are: Li Peng, Niu Mingchang, Wang Xiaobing, Wang Junliang, Mei Jian, Ma Xiaoming, Sun Lihua, and Zhou Wei. 1 Scope
Chemical Industry Standard of the People's Republic of China
Industrial Steel Framed Polyethylene Plastic Composite Pipes Steel framed polyethylene plastic pipes for industryHG/T3690-2001
This standard specifies the basic performance, product classification, requirements, test methods, inspection rules, marking, packaging, transportation and storage of industrial steel framed polyethylene plastic composite pipes (hereinafter referred to as pipes). This standard is applicable to composite pipes with polyethylene as the matrix and a mesh steel skeleton made of steel wire welded as the reinforcement, which are continuously extruded and can be used in petroleum, chemical, pharmaceutical, metallurgical, mining, as well as shipbuilding, municipal construction, food and other industries. The temperature range of the medium transported by the pipe is 0-70℃.
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T343—1994 General purpose low carbon steel wire Test method for density and relative density of plastics
GB/T1033—1986
GB/T2828—1987
GB/T2918—1998
GB/T3681—1983
GB/T6111—1985
GB/T6283—1986
Batch inspection counting sampling procedure and sampling table (applicable to inspection of continuous batches) Standard environment for condition adjustment and testing of plastic specimens Test method for exposure of plastics to natural climate
Determination method for the damage resistance time of thermoplastic pipes under long-term constant internal pressure Determination of water content in chemical products Karl Fischer Method (general method) GB/T6671.2—1986
GB/T8805—1988
GB/T8806—1988
GB/T13021—1991
GB15558.1-1995
3 Definition
Determination of longitudinal dimension shrinkage rate of polyethylene (PE) pipesMethod for measuring curvature of rigid plastic pipes
Method for measuring dimensions of plastic pipes
Determination of carbon black content of polyethylene pipes and fittings (thermal gravimetric method)Buried polyethylene pipes for gas
This standard adopts the following definitions:
Nominal pressure
The maximum pressure allowed for pipes when conveying water at 20℃. 4 Raw materials and requirements
4.1 Polyethylene
4.1.1 Polyethylene special material
The polyethylene used for forming pipes must be pre-mixed special pipe material, and its basic properties shall meet the requirements of Table 1. Approved by the State Economic and Trade Commission on January 24, 2002 and implemented on July 1, 2002
Density, kg/m
Moisture content, mg/kg
Volatile content, mg/kg
Carbon black base content, %
Thermal stability, (200℃) min
Environmental stress cracking resistance, h (100, 100%, F.) Gas component resistance, h (80℃, 2MPa)
Long-term static hydraulic strength, MPa (20℃, 50 years, 95%) Note: Carbon black content is only applicable to black pipes. 4.1.2 Polyethylene recycled materials
HG/T3690—2001
Basic properties of polyethylene raw materials
Performance requirements
The clean residue, debugging and cutting process scraps produced when producing pipes according to this standard can produce pipes that meet the requirements of this standard and can be recycled by adding new materials at a ratio of no more than 5% after crushing or re-granulation. 4.2 Steel wire
Steel wires below 3.0 (including 3.0) are not allowed to have a bend with a radius less than 30mm, and steel wires above 3.0 are not allowed to have a bend with a radius less than 60mm.
4.2.1 Specifications, dimensions, dimensional deviations and properties Steel skeleton steel wires are general-purpose low-carbon steel wires, and the delivery state is SZ galvanized (or copper-plated) steel wires, with a tensile strength of 400~500MPa in the weft, and other dimensions and properties should comply with the provisions of GB/T343. 4.2.2 Surface coating
The surface of low carbon steel wire shall be plated with metal that is rust-proof and has good weldability. The coating shall be uniform, non-peeling and without leakage. The coating surface shall be smooth and flat, and shall not have any dirt such as oil, dirt or ash.
4.2.3 Wire mesh
The mesh density and wire diameter are shown in Table 2. The manufacturer may also make design adjustments according to process requirements, but the bursting strength of the pipe after adjustment shall not be lower than that specified in Table 14.
Nominal inner diameter d
Mesh density
Wire diameter d
Mesh density and wire diameter of ordinary pipe
Note: The diameter of the warp and weft wires of thin-walled pipes shall not be less than 2.0 mm. 5 Product classification
5.1 Product series, specifications and nominal pressure 150
12×12
12×12
12×12
12×12
Pipes are divided into two series: ordinary and thin-walled. Their nominal inner diameter, wall thickness, allowable deviation and nominal pressure shall comply with the provisions of Table 3 and Table 4.
Nominal inner diameter d, mm
Basic size
Average limit deviation
HG/T3690—2001
Table 3 Specifications and nominal pressure of ordinary pipes
Nominal wall thickness e, mm
Basic size
Limit deviation
Note: When the temperature of the conveying medium is higher than 20℃, the nominal pressure shall be corrected according to Table 5, the same as the following table. Nominal pressure
Table 4 Specifications and nominal pressure of thin-walled pipes
Nominal inner diameter d, mm
Basic size
Average limit deviation
Nominal wall thickness e, mm
Basic size
Limit deviation
Nominal pressure
Distance from inner wall to meridian S
Distance from inner wall to meridian S
Nominal pressure correction coefficient
When the pipe is conveying media above 20°C, its nominal pressure should be corrected. The correction method is to multiply the nominal pressure shown in Table 3 and Table 4 by 5
The correction coefficient shown in Table 5.
Temperature t.℃
Nominal pressure correction coefficient
0<Length 20
HG/T3690—2001
Table 5 Nominal pressure correction coefficient
5.1.2 Correction coefficient of nominal pressure when conveying special hazardous media 40<50
When conveying special hazardous media, the corrected nominal pressure should be multiplied by a reduction coefficient of 0.8, or agreed upon by both the supplier and the buyer.
Connection method of pipe
5.2.1 Flange connection pipe
Flange connection pipe joints are divided into three types: ordinary pipe type I, type II and thin-walled pipe type (same structure as ordinary pipe type II), as shown in Figures 1 and 2, and their specifications and dimensions are shown in Tables 6, 7 and 8. Table 6
Nominal inner diameter Dn
Nominal inner diameter Dn
Ordinary pipe I type flange connection pipe joint specifications and dimensions 33
4.15±0.10
4.15±0.10
4.15±0.10
4.15±0.10
4.15±0.10
4.15±0.10
4.15±0.10
5.45±0.10
5.45±0.10
Reinforcement hoop
Figure 1 Structure and size of common pipe flange joint (Type I) Table 7
Specifications and dimensions of common pipe Type II flange connection pipe joints d
4.15±0.10
4.15±0.10
7.10±0.15
7.10±0.15
7.10±0.15
7.10±0.15
7.10±0.15
7.10±0.15
7.10±0.15||t t||7.10±0.15
9.45±0.20
9.45±0.20
7.10±0.15
7.10±0.15
Nominal inner diameter Dn
Nominal inner diameter Dn
HG/T3690-—2001
Table 7 (end)
Reinforced
5.45±0.10
5.45±0.10
5.45±0.10||tt| |5.45±0.10
5.45±0.10
5.45±0.10
Ordinary pipe flange joint (Type II) Structure and size table 8
Thin-wall pipe flange connection pipe joint specification size d
4.15±0.10
4.15±0.10
4.15±0.10
4.15±0.10
7.10±0.15
9.4 5±0.20
9.45±0.20
9.45±0.20
9.45±0.20
9.45±0.20
7.10±0.15
7.10±0.15
7.10±0.15
7.10±0.15
7.10±0.15
When the temperature of the conveying medium is higher than 45℃ or the pressure is higher than the corresponding value shown in Table 9 or Table 10, the flange joint needs to be reinforced with a hoop. 5.2.1.2 Flange joints with a nominal inner diameter Dn greater than 350mm are generally reinforced with a hoop. However, for non-pressure pipelines (such as gravity drainage pipes) or pipelines with low working pressure, the reinforcing hoop can be omitted with the approval of the design department. Nominal pressure table of ordinary pipe flange connection without reinforcing hoop 9
Nominal pressure of thin-walled pipe flange connection without reinforcing hoop Dn65
HG/T3690--2001www.bzxz.net
5.2.1.3 After negotiation between the supply and demand parties, the pipe end flange joint can also adopt the sealing method of turning waterline and adding gasket. 5.2.2 Electric fusion connection pipe
Ordinary pipe electric fusion connection pipe has two structures of flat mouth and tapered mouth according to the insertion method, as shown in Figure 3 and Figure 4. Its specifications and dimensions are shown in Table 11 and Table 12. The dimensions of the tapered mouth of the wall pipe (the structure is the same as the tapered mouth of the ordinary pipe) are shown in Table 13. Table 11 Specifications of the flat end of common pipes for electric fusion connection Nominal inner diameter d, Dn
Nominal inner diameter d, Dn
Outer diameter D of the fusion zone (can be processed again)
71.00±0.20
86.00±0.20
103.00±0.25
123.00±0.25
148.30±0.30
173.10±0.30
224.40±0.4 0
273.80±0.40
324.00±0.50
Electric fusion zone length L
100±5
110±5
115±5
130±5
150±5
Figure 3 Flat end structure of common pipe electric fusion connection pipe end Table 12 Specifications and dimensions of conical end of common pipe electric fusion connection pipe Conical end (small end) outer diameter D
Conical end length L
Sealing thickness!
Nominal inner diameter d, Dn
5.3 Pipe length
HG/T3690-2001
Figure 4 Common pipe electric fusion connection pipe end taper structure ()
Table 13 Thin-walled pipe electric fusion connection pipe taper specifications Taper (small end) outer diameter D
104-:1
125-1:3
152=:3
Taper length L
Standard pipe length a (as shown in Figure 5) is 6m, 8m10m and 12m, and the length tolerance is ±20mm. It can also be agreed upon by both the supplier and the buyer. Flat pipe
Tapered pipe
Figure 5 Standard length pipe
6 Requirements
6.1 Color
Pipes are generally black, and other colors can be determined by negotiation between the supply and demand parties according to the purpose of the pipe. 6.2 Appearance
6.2.1 The inner surface of the pipe should be smooth and flat, without obvious scratches or decomposition discoloration lines. The outer surface of the pipe is allowed to be in a threaded natural shrinkage state, and a small amount of local slight natural shrinkage caused by small bumps is allowed. Obvious scratches, bubbles, impurities, uneven color and other defects are not allowed. 9
The two ends of the pipe should be cut flat and perpendicular to the pipe axis. HG/T3690-2001
6.2.2 The surface of the formed part of the pipe end flange connection joint and the electric fusion connection tapered or flat mouth should be flat and smooth, without defects such as pits, scratches, burrs, etc.
6.3 Specifications, dimensions and dimensional deviations
6.3.1 The specifications, dimensional tolerances and nominal pressures of pipes shall comply with the provisions of Tables 3 and 4. 6.3.2 The specifications and dimensional deviations of flange-connected pipe joints shall comply with the provisions of Tables 6, 7 or 8, and Figures 1 and 2. 6.3.3 The specifications and dimensional deviations of electric fusion-connected pipe ports shall comply with the provisions of Tables 11, 12 or 13, and Figures 3 and 4. 6.4 Out-of-roundness
The out-of-roundness of pipes shall not exceed 5%.
6.5 Physical and mechanical properties
The physical and mechanical properties shall comply with the provisions of Table 14. Table 14 Physical and mechanical properties
Compression cracking stability
Longitudinal dimension shrinkage (110℃, hold for 1h) Short-term hydrostatic strength test
Burst strength test
Temperature 20℃, time, 1h; Pressure: nominal pressure × 1.5 Temperature: 70℃, time: 165h; Pressure: nominal pressure × 1.5 × 0.76 Temperature, 20℃: Increase pressure to pipe burst within 60~70s Weathering test (after the pipe accumulates ≥3.5kMJ/m aging energy) Curvature
The curvature of the pipe shall comply with the provisions of Table 15. Table 15 Curvature of pipes
Nominal inner diameter of pipe d, mm
Curvature, %
Note: Curvature refers to bending in the same direction, and S-shaped bending is not allowed. 125
Performance requirements
No cracks
No rupture, no leakage
No rupture, no leakage
Burst pressure ≥ nominal pressure × 3
Still meet the performance requirements of item 3 in this table
, and maintain good welding performance
When the pipe is used in the food and pharmaceutical industries, it shall comply with the relevant national laws and regulations. 6.7
7 Test method
7.1 Standard environment for sample state adjustment and testing 350
Test method
450500
The standard environment for sample state adjustment and testing complies with the provisions of GB/T2918, the temperature is (23 ± 2) ℃, and the sample state adjustment time is not less than 24h.
7.2 Appearance inspection
Visual inspection, the inner wall can be observed under backlight with a light source. 7.3 Determination of geometric dimensions
7.3.1 Length of pipe
Measured by universal measuring tools with an accuracy of not less than 10mm. 7.3.2 Inner and outer diameters
Measured in accordance with GB/T8806.
7.3.3 Wall thickness
Measured in accordance with GB/T8806.
7.3.4 Other dimensions
HG/T36902001
Measured by measuring tools with an accuracy of not less than 0.02mm. 7.4 Determination of out-of-roundness
Performed in accordance with 5.4 of GB15558.11995. 7.5 Determination of curvature
Performed in accordance with GB/T8805.
7.6 Determination of density
Performed in accordance with GB/T1033.
7.7 Determination of moisture content
Determination shall be carried out in accordance with the provisions of GB/T6283, and the sample shall not be conditioned. 7.8 Determination of volatile matter content
Determination shall be carried out in accordance with the provisions of GB15558.1-1995, 5.7.9 Carbon black content determination
Determine in accordance with GB/T13021.
7.10 Thermal stability determination
Determine in accordance with 5.9 of GB15558.1-1995. 7.11 Gas component resistance determination
Determine in accordance with 5.11 of GB15558.1-1995. 7.12 Physical and mechanical properties of pipes
7.12.1 Pressure cracking stability test
Take a pipe sample with a length of (100 ± 10) mm for the test, place the sample between the hydraulic press plates and slowly press down, and if no cracks are found in the pipe when it is pressed to 50% of the pipe diameter for 10 to 15 seconds, it is considered qualified. 7.12.2 Determination of longitudinal size shrinkage rate
Perform in accordance with GB/T6671.2.
7.12.3 The short-term hydrostatic strength test and bursting strength test shall be carried out in accordance with the provisions of GB/T6111. The test temperature, time and test pressure shall comply with the provisions of Table 14. Refer to Figure 6 for the test fixture. Seal venting
Air release
7.12.4 Weathering test
The test shall be carried out in accordance with the provisions of GB/T3681.
8 Inspection rules
Figure 6 Hydrostatic strength test method
The product shall be inspected and qualified by the quality inspection department of the manufacturer and accompanied by a certificate of conformity before it can leave the factory. 8.1 Inspection classification
The inspection is divided into factory inspection and type inspection. Connect the hydraulic pump
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