HG 20621-1997 Welding Ring Loose-Sleeve Steel Pipe Flange (American System) HG20621-1997 Standard download decompression password: www.bzxz.net

"Butt-weld ring loose-sleeve steel pipe flange
(American system)"
HG 20621-97
Subject content and scope of application
This standard specifies the type, size, technical requirements and relevant use regulations of butt-weld ring loose-sleeve steel pipe flange (American system). This standard is applicable to butt-weld ring loose-sleeve steel pipe flanges with nominal pressure PN2.(0MPa(Class[s0)～11.0MPa(Class600).
HG20615
HG20624
HG20625
HG 20626
HG20634
HG20635
Referenced standards
《Types and parameters of steel pipe flanges (American system)》Technical conditions for steel pipe flanges (American system)》《Pressure and temperature grades of steel pipe flanges (American system)》《Dimensions of welded joints and grooves of steel pipe flanges (American system)》《Fasteners for steel pipe flanges (American system)》Selection regulations for steel pipe flanges, gaskets and fasteners (American system)》3 Flange sealing surface Type
3.0.1 The sealing surface type of the flange is raised face (RF). Its size and selection shall comply with the provisions of Chapter 6 and Chapter 8 of HG20614. 3.0.2 The applicable pressure and diameter ranges of the weld ring loose flange shall comply with the provisions of Table 3.0.2. Table 3.0.2 Applicable range
Sealing surface type
Raised face (RF)
(Class150)
Public pressure PN,MPa(Class)
(Class 300)
DN15~600
（ma）
(Clas600)
4. Flange size
The flange size shall be in accordance with the provisions of Figure 4-1 and Tables 41~3. Table 4-1PN2.0MPa(Class150)Butt welding ring loose sleeve steel pipe flangeTable 4-2PN5.0MPa(Class300)Butt welding ring loose sleeve steel pipe flangeTable 4-3PN11.0MPa(Class600)Butt welding ring loose sleeve steel pipe flangeThe wall thickness S of the butt welding ring is generally equal to the nominal thickness of the steel pipe: determined by the user. It should be specified in the order and Indicated in the marking. The flange thickness S of the butt welding ring shall not be less than the minimum wall thickness of the steel pipe (0.875S) N
Raised face (RF)
Figure 4-1 Butt welding ring loose sleeve steel pipe flange (LF/SE) L (LF with neck loose sleeve)/(SF butt welding ring)
Outer diameter of steel pipe
Nominal diameter
(Butt welding ring
Table 4-1PNz.0MPu (CIass150) Butt welding ring loose sleeve steel pipe flange connection size
Flange bolt hole Middle screw inspection hole Bolt hole
Outer diameter of the shank is the outer diameter Core diameter
19, 562. 5
30.5 277.3
Butt welding ring
Height outer diameter
Difference principle
Weight
150 533. 5
Nominal diameter steel pipe outer diameter
Degradation 4-~2PN5.0MPA(Cla58300)Butt welding ring loose sleeve steel pipe flange connection size
Flange screw inspection hole Middle screw inspection hole Screw inspection hole
(For welding
Neck outer diameter
Outer diameter center circle diameter
24:600
571, 5
22. 562. 5
:25. 5178. 5100
191.5:118
146!
63.5514.5
Butt welding ring
Height outer diameter
Flange
Weight plate
300:533.5124.6
Nominal diameter
Outer diameter of steel pipe
Table 4-3± PN F1. 0MPa(C1$ 600)Butt welding ring loose sleeve steel pipe flange connection size
NPS'EN
Flange bolt hole Center screw inspection hole Bolt holebZxz.net
(For coal bad
Neck outer German outer diameter Center circle diameter
11/4 32
iM36×3
462.51546
610!
718：184
(mm）
Butt welding ring
Commercial outer diameter
Flange theoretical weight
300:692
Technical requirements
Technical requirements for flanges and butt welding rings shall comply with the provisions of HG20624. Maximum non-impact working pressure
The nominal pressure of the flange and the maximum non-impact working pressure at different temperatures shall comply with the provisions of HG20625. 7 Welding joints and grooves
The dimensions of the welding joints and grooves of the butt welding ring and the steel pipe shall comply with the provisions of HG20626. Fastener length
The length of the fasteners (bolts, studs) used shall comply with Appendix A of HG 20534 9
Matching regulations
Matching of gaskets and fasteners shall be in accordance with the provisions of HG20635, 10 Marking
Marking shall be in accordance with the provisions of HG20615,
Additional instructions: The unit proposing this standard, the editor-in-chief and the main drafter: Chemical Process Piping Design Technology Center Station of the Ministry of Chemical Industry Equipment Design Technology Center Station of the Ministry of Chemical Industry
Editor-in-chief: Equipment Design Technology Center Station of the Ministry of Chemical Industry Main drafter: Ying Daoguao Yu Jun
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