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Loose Flange

In terms of connection mode between flange and pipe, flanges falls into five basic categories which are slip-on welding flange, welding neck flange, threaded flange, socket welding flange and loose flange. Loose flange is a combination of two kinds of flanges.

Available Sizes
3/8"~48", DN10~DN1200

Standards
GB/T9112-2000, GB/T9118.1-2000, GB/T9118.2-2000, GB/T9120.1-2000, GB/T9120.2-2000, GB/T9120.3-2000, GB/T9122-2000, GB/T9124-2000
SH/T3406-1996
JB/T74-1994, JB/T75-1994, JB/T84-1994, JB/T85-1994
HG/T20592-2009, HG/T20614-2009, HG/T20615-2009, HG/T20623-2009, HG/T20635-2009
ASME B16.5-2009
EN1092-1-2007, EN1759-1-2004
BS1560-3.1-1989, BS4504-3.1-1989
AFNOR NF E29-200-1-2007
ISO7005-1-1992
JIS B2220-2004

Raw Materials
Carbon steel: A105
Alloy steel: A182 F 1-F 2-F 5-F 9-F 10-F 91-F 92-F 122-F 911-F 11-F 12-F 21-F 22
Stainless steel: A182 304-304H-304L-304N-304LN 316-316H-316L-316N-316LN 321-321H 347-347H
Low-temperature steel: A522 A707 Grade L 1-L 2-L 3-L 4-L 5-L 6-L 7-L 8
High-performance steel: A694 F 42-F 46-F 48-F 50-F 52-F 56-F 60-F 65-F 70

Pressure Grade
American System: CLASS150, CLASS300, CLASS400, CLASS600, CLASS900, CLASS1500, CLASS2500
European System: PN2.5, PN6, PN10, PN16, PN25, PN40

Flange Facing
American System: Raised Face (RF). Tongue Face (T), Groove Face (G), Female Face (F), Male Face (M)
European System: Raised Face, Tongue Face, Groove Face, Female Face, Male Face

Producing Process
Cutting of Raw Material --- Die Forging --- Machining

Application
The flange is widely used in many areas such as power generation plant, petroleum industry, natural gas system, chemical industry, shipbuilding industry, heating system, paper-making industry, metallurgy industry, etc.

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