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Weld neck pipe flanges are typically provided with a raised face, flat face, or RTJ face
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Alloy steel Forged flange
ANSI B16.5, ASME B16.47,MSS-SP 44 big size flange
Size range: 1/2" to 80" DN15 to DN2000
Design: welding neck, slip on, blind, socket welding, threaded, lap-joint
Pressure: 150#, 300#, 600#,900#,1500#, 2500#
Pressure: PN6, PN10, PN16, PN25, PN40, PN64, PN100
Wall thickness for flange: STD, SCH40, SCH80, SCH160. SCHXXS
Material for flange: carbon steel A105, C22.8, S235, S235JR, P235GH stainless steel 304/304L, 316/316L
Alloy steel for high pressure flange: ASTMA182 F5, F1,F11, F9,F91 etc.
Coating: black paint, yellow transparent paint, cold and hot dip galvanize
DIN standard flange
Size range: DN15 to DN2000
Design: slip on flange DIN2573,2576,2502,2503, 2543,2545
welding neck falnge DIN2631, 2632,2633,2634,2635
blind flange DIN 2527 PN6, PN10, PN16, PN25, PN40
threaded falnge DIN2565,2566,2567,2567
loose flange DIN 2641,2642,2656,2673
Material: carbon steel ST37.2, stainless steel 1.4301, 1.4404
Coating: rust-proof oil, transparent paint, cold and hot galvanized.
The weld neck flange consists of a circular fitting with a protruding rim around the circumference which machined from a forging bar, these flanges are typically butt welded to a pipe. The rim has a series of drilled holes that permit the flange to be affixed to another flange with bolts. Such flanges are suitable for use in hostile environments that have extremes of temperature, pressure or other sources of stress.
Weld neck pipe flanges are typically provided with a raised face, flat face, or RTJ face. When a raised face is necessary for weld neck pipe flanges, the standard height is 1/16 inch for weld neck pipe flanges fewer than 400LB. For weld neck pipe flanges of 400LB and up, the standard weld neck pipe flange raised face height is 1/4 inch.
