Haihao Group

1.Scope

This Standard specifies steel pipe flanges (hereafter referred to as “flanges”) of nominal size 10A to 1500A for nominal pressure 5K, 10K, 10K light type,16K, 20K and 30K which are used to join parts for piping, such as steel pipes and valves, in ordinary(1)，pressure (2), high pressure (3), high temperature (4), alloy steel pipes (5), strainless steel pipes (6) piping for steam, air, gas, water, oil, etc. (7).

Notes:

• Piping using Carbon steel pipes for ordinary piping of JIS G 3452 and arc welded carbon steel pipes of JIS G 3457.
• Piping using Carbon steel pipes for pressure service of JIS G 3454.
• Piping using Carbon steel pipes for high pressure service of JIS G 3455.
• Piping using Carbon steel pipes for high temperature serivce of JIS G 3456.
• Piping using Alloy steel pipes of JIS G 3458.
• Piping using stainless steel pipes of JIS G 3459 and large diameter welded stainless steel pipes of JIS G 3468.
• Integral flange, which is to be used as part of some other equipment or components, shall also be within the scope of this Standard.

Weld Neck Flange
Integral Flange
Blind Flange
Socket Weld Flange
Threaded Flange
Plate Flange
Slip On Flange Type A
Slip On Flange Type B
Slip On Flange Type C
Loose Flange/Lap Joint Flange

Classification of flanges and the designation

Classification of flange		Designation	Figure
Welding flange	Silp on plate flange	SOP
	Slip on hubbed flange	SOH
	Socket welding flange	SW
	Welding neck flange	WN
Lap joint flange		LJ
Threaded flange		TR
Intergral flange		IT
Blank flange		BL

Types of nominal pressure 20 K and 30 K slip on hubbed flanges

Classification of flange	Type	Figure
Slip on hubbed flange	Type A
	Type B
	Type C