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Flanges Product Profile
Flanges Product Profile
Flange Product Profile (English | SEO)
Meta Title (≤60): Industrial Flanges | ASME/EN/AWWA/API | WN/SO/BL/SW/Plate – Full Range
Meta Description (≤160): Full-scope flanges to ASME B16.5/B16.47, EN 1092-1, AWWA C207, API 6A. Size DN15–DN6000, Class 150–2500 / PN2.5–PN420. Materials from carbon steel to duplex and nickel alloys.
Keywords: flange, weld neck, slip on, blind, socket weld, plate flange, RTJ, ASME B16.5, EN 1092-1, AWWA C207, API 6A, A105, A350 LF2, A182 F316L, A694 F65, duplex 2205, super duplex 2507, Inconel 625, Hastelloy C276
1) Overview
Flanges provide bolted, gasketed, pressure-tight connections for piping, valves, vessels and equipment. Widely used in oil & gas, refining, petrochemical, offshore, power (thermal/nuclear), mining & metallurgy, waterworks, pulp & paper, food & pharma.
2) Standards & Coverage
• ASME B16.5: NPS ½″–24″, Class 150/300/400/600/900/1500/2500.
• ASME B16.47 Series A/B: NPS 26″–60″, Class 150/300/400/600/900.
• EN 1092-1: DN 10–DN 4000, PN 2.5–PN 420 (common PN 6/10/16/25/40/63/100/160).
• JIS B 2220: 5K, 10K, 16K, 20K, 30K.
• AWWA C207: large-diameter ring/plate flanges for waterworks (typically low-pressure).
• API 6A 6B/6BX: wellhead/choke & kill, 2,000–20,000 psi.
• Compact/Clamp type flanges available per project specifications.
3) Facing & Gasket Seats
• RF, FF, RTJ, T&G, M&F.
• Typical serrated finish 3.2–6.3 μm Ra (125–250 AARH) for RF/FF; R/IX rings for RTJ.
• Pipe end compatibility: Sch10–XXS per design.
4) Materials & Heat Treatment
• Carbon steel: ASTM A105, A350 LF2 (low temp), A694 F52–F70 (high yield).
• Alloy steel: A182 F5/F9/F11/F22/F91.
• Stainless: A182 F304/L, F316/L, F321, F347.
• Duplex / Super Duplex: 2205 (S32205), 2507 (S32750/S32760).
• Nickel alloys: Alloy 400, Inconel 600/625, Alloy 800H/825, Hastelloy C-276.
• Cladding/Lining: SS/Ni alloy weld overlay or explosive clad; PTFE/PFA liners for corrosives.
• NACE MR0175/ISO 15156 / MR0103 compliance on request.
5) Size & Thickness (Typical Ranges)
• B16.5 OD envelope: approx. 90–1200 mm (NPS ½″–24″).
• B16.5 thickness (T): 12–120 mm for Class 150–900; up to 200+ mm for Class 1500/2500.
• B16.47 thickness (T): typically 40–200 mm for 26″–60″.
• EN 1092-1 plate/ring flange thickness: about 12–120 mm depending on PN and DN.
• AWWA plate flanges: about 8–75 mm depending on diameter/series.
• Bolt holes, pitch circle and quantity per respective standard; bolts/nuts available in B7/L7M/B8M etc.
6) Type × Rating × Material × Application Mapping
6.1 Weld Neck (WN)
• Size/Rating: NPS ½″–60″; Class 150–2500.
• Materials: A105, A350 LF2, A182 F11/F22/F91, F304/L, F316/L, 2205, Inconel 625.
• Applications: high-temp/high-pressure service in refining, ethylene, boilers, offshore risers, nuclear auxiliaries.
• Facing: RF/RTJ/T&G.
6.2 Slip-On (SO)
• Size/Rating: NPS ½″–60″; typical Class 150–600.
• Materials: A105, A350 LF2, A182 F304/L, F316/L.
• Uses: utilities, cooling/condensate, storage & transfer, equipment nozzles.
• Facing: RF/FF.
6.3 Socket Weld (SW)
• Size/Rating: NPS ½″–3″; Class 300–1500.
• Materials: A105, stainless/alloy steels.
• Uses: small-bore high-pressure instrument & hydraulic lines.
• Facing: RF.
6.4 Threaded (THD)
• Size/Rating: NPS ½″–4″; Class 150–300 typical.
• Uses: low-pressure, non-welding zones, skids.
• Facing: RF/FF.
6.5 Blind (BL)
• Size/Rating: NPS ½″–60″; Class 150–2500.
• Uses: line terminations, test blinds, vessel manways.
6.6 Plate / Ring Flange (EN 1092-1 Type 01 / AWWA C207)
• Size/Rating: DN 50–DN 4000; PN 2.5–40 typical; low-pressure waterworks per AWWA.
• Materials: carbon steel, 304/316L; galvanized/painted.
• Uses: municipal water, cooling water, HVAC, large low-pressure lines.
6.7 Long Weld Neck (LWN)
• Uses: vessel/tower nozzles, high-temp injection, steam services.
6.8 Lap Joint (LJ with Stub End)
• Uses: corrosive media, frequent dismantling; carbon steel LJ with SS stub ends.
6.9 Orifice Flange
• Uses: flow measurement with taps and plates; Class 300–900 typical.
6.10 Spectacle Blind / Spade & Spacer
• Uses: isolation/blowdown switching in process lines.
6.11 Reducing / Expanding Flange
• Uses: diameter transitions at pumps, exchangers, metering skids.
6.12 Swivel Flange / SAE Hydraulic Four-Bolt
• Uses: offshore subsea alignment, hydraulic high-pressure systems.
6.13 API 6A 6B/6BX
• Rating: 2,000–20,000 psi; PSL/NACE per well service.
• Uses: wellhead, Xmas tree, choke & kill.
7) QA & Documentation
• Dimensional inspection; PCD and hole alignment verification.
• PMI, hardness/impact if required.
• NDT: UT/MT/PT/RT to specified levels.
• Hydrostatic/Leak tests on request.
• Certificates: EN 10204 3.1/3.2 MTC; heat treatment records; coating reports; NACE declaration.
• Surface protection: oiling, galvanizing, paint systems (zinc-rich epoxy + top coat), FBE.
8) Ordering Checklist
• Standard & type (e.g., ASME B16.5 WN RF).
• Size & rating (e.g., NPS 12″ Class 600 / DN300 PN40).
• Facing & surface finish (RF/RTJ/T&G; AARH).
• Material (A105N / A350 LF2 / A182 F316L / 2205 / Ni alloy; NACE if needed).
• Mating pipe schedule or ID for bore machining.
• Coating/galvanizing, NDT level, hydrotest.
• Documentation (MTC 3.1/3.2).
• Service data (medium/temperature/pressure/corrosion) for material/facing optimization.
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