Some standard content:
Industry Standard of the People's Republic of China
HG 20520-92
Glass Fiber Reinforced Plastics/Polyvinyl Chloride (FRP/PVC)
Design Provisions for Composite Pipeswww.bzxz.net
1992-07-13
Implemented on 1992-11-01
Ministry of Chemical Industry of the People's Republic of China
Industry Standard of the People's Republic of China
Design Provisions for Glass Fiber Reinforced Plastics/Polyvinyl Chloride (FRP/PVC) Composite Pipes
HG 20520-92
Editor: The Third Design Institute of the Ministry of Chemical Industry
Approving Department: The Ministry of Chemical Industry
Editing Center of Engineering Construction Standards of the Ministry of Chemical Industry
Beijing, 1992
Document of the Ministry of Chemical Industry
Chemical Base Development [19927547]
Notice on the Issuance of
"Glass Fiber Reinforced Plastic/Polyvinyl Chloride Composite Pipeline Design Regulations"
To all provincial, autonomous region, municipality directly under the Central Government, and independently planned cities, and all relevant design units:
"Glass Fiber Reinforced Plastic/Polyvinyl Chloride Composite Pipeline Design Regulations" compiled by the Third Design Institute of the Ministry of Chemical Industry has been reviewed and approved as a chemical industry standard with the number HG20520-92, which will be implemented from November 1, 1992.
The Chemical Process Piping Design Technology Center of the Ministry of Chemical Industry is responsible for the interpretation and management of the standard, and the publication and distribution of the standard is the responsibility of the Editing Center of Engineering Construction Standards of the Ministry of Chemical Industry. If any design unit encounters any problem or opinion during use, please contact the piping design technology center in time so that it can be supplemented and improved in the future. Ministry of Chemical Industry
July 13, 1992
Scope of use
Related standards
-General requirements
3 Pipeline layout
-General provisions
Pipeline spacing
Items
3.3 Size of openings for pipelines passing through floors and walls. 4 Pipeline support
Pipeline span
4.2 Pipeline supports and hangers
5 Thermal compensation of pipelines
5.1 Thermal compensation calculation
5.2 Selection of compensators
6 Insulation and coloring of pipes
7 Technical conditions for installation
General provisions for pipeline installation
7.2 Installation requirements for pipeline connections
7.3 Installation of compensators
Pressure testing of pipes
Storage and transportation of pipes
Pipe spacing table for socket and butt-welded straight pipes·
Appendix A
Pipe spacing table for parallel pipes with non-staggered flanges (or insulation)Appendix B
Pipe spacing table for parallel pipes with staggered flanges
Appendix C
(3)
(4)
(6)
Appendix D
Table of openings and casing dimensions for pipes passing through floors and wallsCalculation of basic span
Appendix E
Appendix F
Appendix G
Appendix H
Attachment A
Attachment B
Attachment C
Attachment D
Equivalent linear expansion coefficient of FRP/PVC pipes
FRP/PVC VC pipe strength check
Insulation materials and protective layer materials
Dimensional drawing of connection between FRP/PVC pipe and brick or concrete tank FRP reinforcement structure for socket connection of FRP/PVC pipe Dimensional drawing of flange reinforcement thickness for composite flat welding flange connection Dimensional drawing of reinforcement thickness of composite flat flange cover Clause description
Main symbols
DN--nominal diameter of FRP/PVC pipe, mm; D-diameter or length, mm
l--distance from the center of the pipe to the wall, mm, L., L. *Basic span of FRP/PVC pipes inside and outside the device, m; L1, L*Span value determined by the stiffness conditions of FRP/PVC pipes inside and outside the device, m;
Calculated linear density of FRP/PVC pipe (including all vertical uniformly distributed continuous loads such as FRP/PVC pipe, materials, insulation materials and protective layer), kg/m; D. - Reduced bending stiffness of FRP/PVC pipe, N/mm2 - Axial elastic modulus of the inner and outer pipe materials of FRP/PVC pipe, MPa; EE
Imr.
- Second moment of area of the cross section of the inner and outer pipe layers of FRP/PVC pipe, mm* Span value of the pipeline inside and outside the device determined by strength conditions, m: Outer radius of the inner and outer pipe layers of FRP/PVC pipe, mm; Section modulus of the inner or outer pipe layer of FRP/PVC pipe, mm; A, B, C
- Size of FRP/PVC pipe section, m,
Concentrated load, kg;
Maximum allowable span of the pipe section determined by concentrated load and uniform load, m;
Axial tensile and compressive stress caused by restoring force in the outer pipe layer, N/mm\ Restoring force in the inner pipe Axial tensile and compressive stress caused in the layer, N/mm; bending normal stress caused by the bending moment generated by the restoring moment in the outer pipe layer, N/mm\;
Bending normal stress caused by the bending moment generated by the restoring moment in the inner pipe layer, N/mm\
[S——Annular allowable shear stress of the outer pipe layer material at the calculation temperature, N/mm2;
Tn1-Shear stress caused by the torsional moment in the outer pipe layer material N/mm\, Tn2
Shear stress caused by the torsional moment in the inner pipe layer material, N/mm2; Lo——Axial basic allowable stress of the outer pipe layer material at the calculation temperature. N/mm\;
Annular basic allowable stress of the outer pipe layer material at the calculation temperature. Ea
CaJ—Basic allowable stress of inner pipe layer material at calculation temperature, N/mm\;oi—Composite axial stress in outer pipe layer material, N/mm:012—Composite axial stress in inner pipe layer material, N/mm2—Axial stress caused by internal pressure in inner pipe layer, N/mm20g—Hooped stress caused by internal pressure in inner pipe layer, N/mm2,-Radial stress caused by internal pressure in inner pipe layer, N/mm\;-Axial stress caused by internal pressure in outer pipe layer, N/mm\o—Hooped stress caused by internal pressure in outer pipe layer, N/mm\;FRP glass fiber reinforced plastic;
PVC polyvinyl chloride;
FRP/PVC pipe—glass fiber reinforced plastic/polyvinyl chloride composite pipe;Inner pipe layer—polyvinyl chloride inner lining layer of FRP/PVC pipe;Outer pipe layer—external glass fiber reinforced plastic reinforcement layer of FRP/PVC pipe. 2
1.1 Scope of Use
All pipes or pipe accessories processed and manufactured in accordance with the standard "Fiberglass/Polyvinyl Chloride (FRP/PVC) Composite Pipes and Fittings" (HG515-87) should comply with these regulations during design and installation.
1.2Related standards
"Hard polyvinyl chloride pipe fittings for chemical industry" (GB4219-84) "Hard polyvinyl chloride pipe fittings for chemical industry" (GB4220-84); "Pipeline span design regulations" (CD42A22-84): "Chemical pipeline design specifications" (HGI8-87), "FRP/PVC composite pipe rack labeling" (ACD30B1~8); "Chemical equipment and pipeline external anti-corrosion design regulations" (HGJ34-90): "Industrial pipeline engineering construction and acceptance specifications metal pipeline" (GBF235-82)
"Hard polyvinyl chloride welding rod" (HGB2161-62); "Industrial equipment and pipeline insulation engineering construction and acceptance regulations" (GBI126-89)
"Plastic combustion performance test method oxygen index method" (GB2406-80). 1.3When implementing this regulation, if there is any discrepancy with the current national regulations, the national standards shall be implemented.
2 Overview
2.1 Materials
2.1.1 The main mechanical properties of FRP/PVC pipes shall meet the following indicators: tensile strength: ≥160N/mm2;
bending strength: ≥180N/mm2;
impact strength: ≥16N/mm2;
interlaminar shear strength: ≥5N/mm2.
2.1.2 The minimum burst stress of FRP/PVC materials shall meet the following indicators: FRP/PVC pipes: 020=294N/mm2;
FRP/PVC pipe fittings: 020210N/mm2;
PVC pipe joint reinforcement layer: 020=120N/mm2 2.I.3 The reinforcement layer of FRP/PVC pipes and fittings used in chemical plants must be flame retardant, and the true oxygen index value [O door shall not be less than 26. 2.1.4 The types of FRP/PVC pipe fittings include elbows, tees, reducers, etc. The pipe sizes are shown in Table 2.1.4. The selection should be made in accordance with this regulation during engineering design. 2.2 General requirements
2.2.1 FRP/PVC pipes are used for conveying temperatures of 10 to 80°C and pressures ≤1.6MPa corrosive fluid (corrosive media application range is the same as PVC pipe). The allowable working pressure of FRP/PVC pipes under different temperature conditions is shown in Table 2.2.1. 2.2.2 In order to prevent the accumulation of static electricity in FRP/PVC pipes when conveying fluids, which may cause explosion and fire hazards, low-speed conveying should be adopted. 4
Nominal diameter
DN(mm)
Nominal diameter
DN(mm)
65~150
200300
350~600
FRP/PVC pipe specification size table
Nominal pressureFRP/PVC pipe
PVC pipe layer
PN(MPa)
Outer diameter (mm)
Outer diameter (mm)
PVC pipe layer
Thickness (mm)
Relationship between allowable working pressure and temperature of FRP/PVCTheoretical weight
(kg/m)
Allowable working pressure P (MPa) of FRP/PVC pipe at the following temperatures (C) 20
Note: The allowable working pressure value is obtained by interpolation method for intermediate temperatures. 65
3 Pipeline layout
3.1 General provisions
3.1.1 FRP/PVC pipes should not be laid in places with severe vibrations, and it is strictly forbidden to lay them on the ground that is easily impacted. They should be laid in overhead or trenches (avoid direct burial as much as possible), and should avoid crossing firewalls or fire dikes. 3.1.2 Overhead pipelines shall not be equipped with valves, expansion joints, flanges, etc. above the sidewalk, and the net distance between the pipeline and the ground should not be less than 2m. 3.1.3 When FRP/PVC pipes are laid together with metal pipes, they should be laid under or on the side of the metal pipes, and shall not be installed near heat sources greater than 80℃ (except for those taking protective measures).
3.1.4 FRP/PVC pipes that transport different fluids should be arranged on the same layer of pipe racks. Pipes with higher temperatures or smaller diameters, or with more branches, should be arranged on the side. : 3.1.5 The pipeline layout should have a slope, and the size of the slope can be determined according to the characteristics of the fluid transported by the pipeline.
3.1.6 The size and position of the instrument interface or the drainage pipe, vent pipe interface, etc. that need to be opened on the pipeline shall be determined by the design (generally constructed on site according to the drawings, but the pipeline flanges required for instrument installation should also be ordered from the manufacturer). 3.1.7 When FRP/PVC pipelines need to be buried, the burial depth shall be determined according to the soil properties, freezing conditions and load conditions, and shall also meet the following requirements: 3.1.7.1 The fluid transported is generally a liquid with weak corrosiveness, low viscosity, and no toxicity or explosion hazard.
3.1.7.2 The fluid system is at normal temperature and low pressure, and the accumulated materials in the pipe will not solidify and crystallize when the vehicle is stopped.
3.1.7.3 Frequent maintenance is not required, and the floor is an ordinary floor (not special materials such as tiles).
3.1.7.4 The top of the buried pipeline under the sidewalk shall not be less than 0.4m from the road surface; under general roads, it shall not be less than 0.7m. 3.1.7.5 When the pipeline crosses the main road, a steel casing shall be installed, and the top of the casing shall not be less than 0.8m from the road surface. Both ends of the casing shall extend 1m outside the roadbed. 3.1.7.6 Flange connections shall not be used for buried pipelines. 3.1.7.7 For the requirements of foundation and cover, please refer to the provisions of 7.1.4. 3.1.8 For FRP/PVC pipelines that are constructed and put into production in phases, it is advisable to add a shut-off valve at the reserved joint and add a flange cover at the open end of the valve. If the later construction does not affect the pipeline produced in the earlier stage, the flange and flange cover can be directly installed without adding a shut-off valve. 3.2 Pipe Spacing
In order to save space and facilitate installation and maintenance, when FRP/PVC pipes are laid along buildings or parallel or cross-laid with other pipes, the clear distance between pipes should not be less than 100mm. The minimum spacing is shown in Appendix A and Appendix C.
3.3 Hole Sizes for Pipes Passing Through Floors and Walls FRP/PVC pipes are often used in environments with corrosive media. For pipes passing through walls and floors, holes should be reserved on the wall or floor, and sleeves should be pre-buried in the holes. Waterproof shoulders must be provided around the reserved holes on the floor, see Appendix D. 7
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