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Flanges
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Flanges manufacturer in USA SVR Global manufactures pipe flanges that can connect pipes, valves, pumps, and other fittings used in process piping, water transmission, and structural pipeline systems. Our products are made according to dimensional standards of ASME B16.5, ASME B16.47 (Series A and Series B), ASME B16.36, AWWA C207, DIN, and EN 1092 in carbon steel, stainless steel, alloy steel, and ductile iron from sizes NPS 1/2” to NPS 60” and pressure class 150 through 2500 Weld Neck Flange- Long tapered hub, butt welded to the pipe Bore matches pipe ID for unrestricted flow Gradual stress transfer from flange to pipe wall Suited for high pressure, high temperature, and cyclic loading service Socket Weld Flange- Pipe end inserts into a machined counterbore in the hub Fillet-welded at the hub, smooth internal bore No weld root exposed inside the flow path Used mainly on small bore, high pressure piping Slip On Flange- Slides over the pipe end Fillet welded on both inside and outside Easier alignment and lower cost than weld neck flanges Suited to moderate pressure service, up to Class 600 Screwed Flange (Threaded Flange)- Internal NPT/BSPT threads Screws directly onto matching pipe threads Requires no welding Used on low pressure lines and welding restricted locations Blind Flange- Solid, unbored plate with no center hole Bolts onto a pipe end, valve, or vessel opening Seals the line off completely Removable for future tie ins, testing, or maintenance access Lap Joint Flange- Loose flange paired with a separate butt-welded stub end Only the stub end contacts the process fluid Rotates freely for quick bolt-hole alignment Suited for piping requiring frequent dismantling ASME B16.5 - NPS 1/2" to 24", pressure classes 150 to 2500 ASME B16.47 Series A & B - NPS 26" to 60", pressure classes 75 to 900 ASME B16.36 - Orifice flanges AWWA C207 - Steel pipe flanges for waterworks service, Classes D, E, F DIN / EN 1092-1 - PN 6 to PN 100 flange series MSS SP-44 - Large diameter carbon steel flanges Facing Type Description Raised Face (RF) Standard gasket contact surface raised above the bolt circle Flat Face (FF) Full flange face flush with bolt circle, matched to cast iron mating flanges Ring Type Joint (RTJ) Machined groove for a metallic ring gasket, used on high pressure/high temperature service Male Female (MF) / Tongue Groove (TG) Interlocking facing for improved gasket alignment and seating Carbon Steel: ASTM A105, A350 LF2 Stainless Steel: ASTM A182 F304/F304L, F316/F316L, F321 Alloy Steel: ASTM A182 F11, F22, F91 Ductile Iron: ASTM A536 for waterworks flanges per AWWA C207 Duplex / Super Duplex: ASTM A182 F51, F53 Bolt holes spacing, bore size, and hub thickness according to the schedule and pressure rating of the mating pipe ASME B46.1 surface finish for gasket seat surface (Ra 125-250 for RF flanges) Pressure temperature ratings as per ASME B16.5 Table 2 based on the material group specified Corrosion allowance and NACE MR0175/MR0103 compliance available for sour service applications Post weld heat treatment and full radiography available for high pressure and low temperature carbon steel flanges Water transmission mains, pump stations, and treatment plant piping (AWWA C207 flanges) Oil and gas gathering lines, pipelines, and wellhead piping Power plant steam and feedwater piping Desalination and water reuse piping systems Marine and offshore piping systems Pulp, paper, and metallurgical process piping Instrumentation and orifice metering runs Bolting & Torque Guidance: Bolts based on ASTM A193 (Standard Grade B7, B16 for elevated temperatures, B8/B8M for stainless applications); nuts based on ASTM A194 (Grade 2H, 7, 8/8M to correspond) Length of the bolts such that 1-2 threads protrude from under the nuts; washers are installed to avoid galling Tightened using a criss cross (or star) tightening sequence, not one that moves in succession around the circumference Torqueing is done in stages: 30%, 60%, 100%, and then a final tightening by the circumferential method Target torque based on bolt size, material, and gasket type, per ASME PCC-1 guidelines Calibrated torque wrenches or tensioning tools used anti seize/lubricant applied to threads for accurate torque to tension conversion Uneven or sequential tightening is the leading cause of flange joint leaksTypes of Flange:
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