HG/T 21562-1994 Polytetrafluoroethylene lined steel pipes and fittings HG/T21562-1994 Standard download decompression password: www.bzxz.net

Industry Standard of the People's Republic of Chinabzxz.net
HG/T 21562--94
Polytetrafluoroethylene-lined steel pipes and fittings
Published on 199412-29
1995--03--01
Ministry of Chemical Industry of the People's Republic of China
Industry Standard of the People's Republic of China
Polytetrafluoroethylene-lined steel pipes and fittings
HG/T 21562—94
Editor: Shanghai Pharmaceutical Design Institute
Approving department: Ministry of Chemical Industry
Effective date: March 1, 1995 Engineering Construction Standard Editing Center of the Ministry of Chemical Industry
1995 Beijing
Ministry of Chemical Industry Document
Hua Jian Fa (1994) No. 892
Notice on Issuing the Chemical Industry Standard
"Polytetrafluoroethylene-lined Steel Pipes and Fittings" To all provincial, autonomous region, municipality directly under the Central Government, and independently planned cities, and all relevant design units:
The "Polytetrafluoroethylene-lined Steel Pipes and Fittings" standard compiled by the Shanghai Pharmaceutical Design Institute organized by the Ministry's Process Piping Design Technology Center has been reviewed and approved as a recommended chemical industry standard, numbered HG/T21562--94. It will be implemented on March 1, 1995.
This standard is managed by the Process Piping Design Technology Center of the Ministry of Chemical Industry; and published and distributed by the Engineering Construction Standard Editing Center of the Ministry of Chemical Industry. Ministry of Chemical Industry
December 29, 1994
Subject content and scope of application
Referenced standards
Dimensions
3.2 Carbon steel pipe fittings.
Cast steel pipe fittings
Technical conditions
Steel pipes and fittings
Polytetrafluoroethylene pipes and fittings
Marking, packaging, transportation, storage
Appendix A
Preparation instructions
(3)
1 Subject content and scope of application
This standard specifies the dimensions, technical conditions, inspection, marking, packaging, transportation and storage of polytetrafluoroethylene steel pipes and fittings. 1.0.2 This standard applies to the design pressure ≤1.6MPa gauge pressure, fluid medium temperature>-20℃～≤180℃, with carbon steel and cast steel (only for pipe fittings) as the base, and lined with polytetrafluoroethylene plastic true pipe and pipe fittings. See Table 1.0.2-1. Table 1.0.2-1
Polytetrafluoroethylene pipe forming method
Wrapping pipe
Welding pipe
Pushing, extrusion pipe
Using temperature
>20℃~150℃
>—20℃-180℃
>-20'℃-~180'℃
Nominal pressure
≤0.6MPa
≤1.6MPa
Negative pressure is only applicable to tight lining, and the relationship between negative pressure and temperature is shown in Table 1.0.2-2. Table 1. 0.22
0℃-110℃
≥110℃~140℃
>140℃~180C
—95hPa
-40kPa
1.0.3 This standard does not apply to steel pipes and fittings coated with polytetrafluoroethylene, nor to lined steel pipes and fittings processed by the pasting method. 1
2 Reference standards
GB1040 "Plastic tensile test method"
GB7136 "General purpose molded polytetrafluoroethylene resin" GB8163 "Seamless steel for conveying fluids"
GB8923 (Steel surface rust grade and rust removal grade" GB9114.2 "Raised face threaded steel pipe flange with neck" GR9116.8 "Raised face flat welded steel pipe flange with neck" GB9117.2 "Raised face socket welded pipe flange with neck" GB9118.1 "Raised face welded loose sleeve neck steel pipe flange 》GB11352《Casting carbon steel parts for general engineering》GB12381.2《Raised face threaded ductile iron pipe flange》GB12459《Steel butt-welded seamless pipe fittings》
ZBG33001《Polytetrafluoroethylene pipe》
ZBG33002《Polytetrafluoroethylene sheet》
HG20553《Dimension selection series of seamless and welded steel pipes for chemical piping》HGJ46《Raised face flat-surface pipe flange with neck》HGI54《Raised face socket-welded steel pipe flange》HGJ57《Raised face flat-welded loose sleeve plate steel flange Pipe flanges》IIGJ229《Industrial equipment, pipeline anti-corrosion construction and acceptance specifications》GBJ235《Industrial pipeline engineering construction and acceptance specifications》2
Steel pipes adopt the I series in HG20553《Chemical piping seamless and welded steel pipe size selection series》. If the project requires the 1 series, please refer to the size table in Appendix A.
3.1 Straight pipes
The structural type and size of the raised face neck threaded pipe flanges for straight pipe ends shall comply with the provisions of Figure 3.1.1 and Table 3:1.1 respectively. Figure 3.1.1
Nominal Diameter
Outer diameter of pipe
Minimum)
See 4.3.5
Length of pipe
See 4.2.1
3.1.2 For the convenience of installation, a fixed flange is used at one end of the straight pipe. Pipes ≤DN80 use GB9117.2 "Raised face socket welding steel pipe flange with neck", and pipes ≥DN80 use GB9116.8 "Raised face flat welding steel pipe flange with neck", and the other end uses a loose flange (GB9118.1 "Raised face welding ring loose neck steel pipe flange"). Fixed flanges can also be used at both ends of the straight pipe as needed. The structural type and size should comply with the requirements of Figure 3.1.2 and Table 3.1.2.
Loose-fit flange
Loose-fit flange
Socket welding flange
Slip-on welding flange
Nominal diameter
Outer diameter of pipe
Minimum)
See 4.3.5
Carbon steel pipe fittings
Pipe length
See 4.2.1
3.2.1 The structural type and size of the elbow shall comply with the provisions of Figure 3.2.1 and Table 3.2.1 respectively. Socket welding flanges shall be used for elbow flanges ≤DN80, and slip-on flanges shall be used for elbow flanges >DN80.
90° elbow
Socket welding flange connection
45° elbow
Socket welding flange connection
Continued Figure 3.2.1
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