Commonly used standards for stainless steel flanges used in the chemical and petrochemical industries
Commonly used standards for stainless steel flanges used in China's chemical and petrochemical industries
1.Inch tube (Internationally used piping series) GB 9112～9125, SH 3406
2. Metric pipe (domestic steel pipe outer diameter size series) HGJ44～76, JB/T74～90 DIN connection size is different from JB flange standard, see the following table:
Standard thread (M) / screw hole (φ) size
JB Series 2M22/φ25
(all) M30/φ34
(partial) M36/φ41
(partial) M42/φ48
(all) M48/φ54
(all)
New HG, ISO, JB Series 1, BS, OCT, DMN24/φ26M33/φ36M33/φ36M39/φ42M45/φ48M45/φ48
When two parts of the flange are used
The first line of measures taken
Screw hole reaming 1mm first row flange
Screw hole reaming 2mm can be added with washers can be added with washers can be added with washers
Note: “All†in parentheses in the table indicates that all fasteners are replaced by fasteners in the second row. “Partial†means that some of the fasteners of this specification have changed, but there are still some specifications of fasteners that are unchanged and consistent.
When using the new HG standard with the JB old standard flange, pay attention to the following points:
1. The number of bolts with three flanges is inconsistent. Two of them (PN0.25DN500, PN0.6DN500) directly affect the fit. The number of standard bolts of PNl.0-DN80HG is 8. The number of standard bolts is 8.
2. The screw holes of some old standard flanges (JB series 2) can be reamed 1-2mm, and the other part can be added with washers during installation;
3, PN16.0MPa high pressure pipe flange, the new HG and JB standard connection size is completely different.
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