What is flange?
A flange is a device that joins pipes, valves, pumps, and other pieces of machinery to create a plumbing system. Additionally, it offers simple access for maintenance, inspection, or modification. Flanges are often screwed or welded. A gasket is placed in between the two flanges before being bolted together to create a flanged junction.
Flange classification
1. ASME specification
ASME B16.5 Pipe flanges from DN15 to DN600
Class: 150, 300, 400, 600, 900, 1500, 2500
Types: Threaded flange, Slip-on welding flange, Socket welding flange, Lapped flange, Blind flange, Welding neck flange
ASME B16.47 large diameter steel flange from DN650 to DN1500
Series A Class: 150, 300, 400, 600, 900
Series B Class: 75, 150, 300, 400, 600, 900
Types: Blind flange, Welding neck flange
Material: A105, A350 LF2, A350 LF6 CL2, A182 F1, A182 F2, A182 F5, A182 F9, A182 F304, A182 F316, A182 F304L, A182 F316L, A182 F321
2. EN specification
EN1092-1 Circular flanges for pipes
Material: S235JR, P355NH, A105, A350 LF2, A350 LF6 CL2, A182 F1, A182 F2, A182 F5, A182 F9, A182 F304, A182 F316, A182 F304L, A182 F316L, A182 F321
Type 01: Plate flange
Type 02: Loose plate flange with weld-on collar (type 32) or lapped pipe end (type 33)
Type 04: Loose plate flange with weld-neck collar (type 34)
Type 05: Blank flange
Type 11: Weld-neck flange
Type 12: Hubbed slip-on flange for welding
Type 13: Hubbed threaded flange
Type 21: Integral flange
Type 32: Weld-on plate collar
Type 33: Lapped pipe end
Type 34: Weld-neck collar
Pressure class: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100
3. JIS specification
JIS B2220 Steel pipe flanges
Types: Slip-on plate flange (SOP)
Slip-on hubbed flange (SOH)
Socket welding flange (SW)
Welding neck flange (WN)
Lap joint flange (LJ)
Threaded flange (TR)
Integral flange (IT)
Blank flange (BL)
Material: SS400, S20C, SUS304, SUS304L, SUS316, SUS316L
Pressure class: 5K, 10K, 16K, 20K, 30K
