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Petrochemical Standards

Current location: Home > Product > Flange > Petrochemical Standards

Welding neck flange

Release time:2020/06/29    Number of visits:

高颈对焊法兰(图1)

Materials

· CARBON STEEL – SA-105N, SA-350LF2-1, A694, CSA Z245.12, SA-516-70

· STAINLESS STEEL – SA-182 304/304L, 316/316L, 317/317L, 321/321H, 347/347H, 304H, 310

· CHROME ALLY STEEL – SA-182 F11, F22, F5, F9, F91

· DUPLEX STAINLESS– F51/2205, F53/2507, F60

· EXOTICS – ALUMINIUM, TITANIUM, NICKEL ALLOYS

Flanges & Rings

· ASME/ANSI B16.5 FORGED FLANGES

· LDS LARGE OD SO & LJ FLANGES – INDUSTRY STANDARD

· HIGH YIELD CSA Z245.12 & AWWA FLANGES

· B16.47-A/MSS SP-44 & B16.47-B/API-605

· ASME/ANSI B16.36 ORIFICE FLANGES

· ASME/ANSI B16.48 SPECTACLE BLINDS – LINE BLANKS, PADDLES, SPACERS

· DIN FLANGES, JIS FLANGES, PLATE FLANGES

· LONG WELDNECKS, EXPANSION BARRELS, & BODY CONNECTORS

· LAP JOINT END RINGS & GROOVED RINGS FOR COUPLING CONNECTORS

Product Range

· Size:DN15MM-DN5000MM

· Standard: EN  ASME  JIS  BS  ,GB 12459, SHJ, HGJ Anst, DIN, ISO standard

· Pressure:150LB-2500LB

Tolerances on flange dimensions (ASME/ANSI B16.5 and B16.47,and MSS SP-44)




DimensionRangeTolerance
inmm
General and Blind Flanges:
G(raised face diameter)≤NPS±0.03±0.76
≥NPS 26,with 0.06 in raised face±0.06±2.03
≥NPS 26,with 0.25 in raised face±0.04±1.02
I(bolt hole diameter)AllNo telerance in B16.5 or B16.47
J(bolt circle diameter)All±0.06±1.52
Centre to centre of adjacent bolt holesAll±0.03±0.76
Eccenticity of bolt circle and machined facing diameters≤NPS 2 1/2±0.03±0.76
≥NPS 3±0.06±1.52
Weld Neck Flanges:
D(overall length)≤NPS 4﹢0.06﹢1.52
NPS 5 to 10﹢0.06,﹣0.12﹢1.52,﹣3.05
NPS 12 to 24﹢0.12,﹣0.18﹢3.05,﹣4.57
≥NPS 26±0.19±4.83
Thickness of hubAll>87.5% of pipe nominal wall thickness
Slip on,Lap Joint and Socket Welding Flanges:
B(inside diameter,or bore)≤NPS 10﹢0.03,﹣0.0﹢0.76,﹣0.0
≥NPS 12﹢0.06,﹣0.0﹢1.52,﹣0.0
Threaded Flanges:
B(counterbore)    (Not applicable for Class 150 lb)≤NPS 10﹢0.03,﹣0.0﹢0.76,﹣0.0
≥NPS 12﹢0.06,﹣0.0﹢1.52,﹣0.0




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