OEM manufacturer ASME B16.5 (flange end) · Manufacturer standard (body) · ASME B31.3 (branch reinforcement)
Weldoflanges & Nipoflanges — ASME B16.5 Flange End
Weldoflanges and nipoflanges are one-piece forged branch outlets that combine a weldolet or nipolet with a flange, giving a flanged branch from a header. Teshi Group manufactures both with the flange end to ASME B16.5 and the body to manufacturer standard or client drawing.
Also called: weldoflange, nipoflange, flangeolet, flanged olet, flanged branch outlet
What are Weldoflange & Nipoflange?
A weldoflange is a short forging with a contoured base that is butt-welded onto the run pipe like a weldolet, topped by a weld neck flange. A nipoflange has a longer nipple-like body, so the flange stands off the header, for example to clear insulation or reach a valve; the base is set on or into the run pipe and welded. Each replaces a branch fitting, a pipe nipple and a flange, removing welds and fit-up. The flange end follows ASME B16.5, but the outlet body has no ASME or MSS dimensional standard, so lengths come from the manufacturer or drawing.
Key features
- One-piece forging: outlet plus flange
- Flange end drilled and faced to ASME B16.5
- Base contoured to the run pipe size
- Nipoflange stand-off length to clear insulation
- Removes a nipple, a flange and at least one weld
Specification
| Supply | OEM manufacturer — Teshi Group, India |
|---|---|
| Standard | Flange end to ASME B16.5; body to manufacturer standard / client drawing (no ASME/MSS dimensional standard) |
| Size range | Small-bore branches, typically NPS ½″–2″ outlet; other sizes to order |
| Pressure class | Class 150–2500 flange end |
| Facing | RF, RTJ |
| Materials — carbon steel | ASTM A105 / A105N; ASTM A181 Cl 60, Cl 70; ASTM A266 Gr 2, Gr 4 (large forgings) |
| Materials — high-yield carbon steel | ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70 (MSS SP-44 grades F52–F70) |
| Materials — low-temperature carbon steel | ASTM A350 LF1, LF2 Cl 1, LF2 Cl 2, LF3, LF6, LF9 |
| Materials — alloy steel (Cr-Mo) | ASTM A182 F1, F2, F5, F5a, F9, F11 Cl 1 / 2 / 3, F12 Cl 1 / 2, F21, F22 Cl 1 / 3, F22V, F91, F92, F911; ASTM A336 F11, F22 (large forgings) |
| Materials — stainless steel | ASTM A182 F304, F304L, F304H, F304LN, F309H, F310, F316, F316L, F316H, F316LN, F316Ti, F317, F317L, F321, F321H, F347, F347H, F348 |
| Materials — 904L and 6Mo | 904L (ASTM A182 F904L, UNS N08904); 254 SMO / 6Mo (ASTM A182 F44, UNS S31254); AL-6XN (ASTM A182 F62, UNS N08367) |
| Materials — duplex stainless steel | ASTM A182 F51 (UNS S31803), F60 (UNS S32205, 2205) |
| Materials — super duplex stainless steel | ASTM A182 F53 (UNS S32750, 2507), F55 (UNS S32760), F61 (UNS S32550) |
| Materials — nickel alloys | ASTM B564 / B160 / B462: Nickel 200 / 201 (N02200 / N02201), Monel 400 (N04400), Monel K-500 (N05500), Inconel 600 (N06600), Inconel 625 (N06625), Inconel 718 (N07718), Incoloy 800 / 800H / 800HT (N08800 / N08810 / N08811), Incoloy 825 (N08825), Hastelloy C276 (N10276), Hastelloy C22 (N06022), Hastelloy B2 / B3 (N10665 / N10675), Alloy 20 (N08020) |
| Materials — titanium | ASTM B381 Grade F1, F2, F5 (Ti-6Al-4V), F7, F12 |
| Materials — copper-nickel | Cu-Ni 90/10 (UNS C70600) and 70/30 (UNS C71500), ASTM B151 bar; flanges to ASME B16.5 or EEMUA 145 |
| Grade availability | Every grade listed is made or supplied against order, with EN 10204 3.1 certificates (3.2 / third-party inspection when specified) and PMI on alloy, stainless, duplex and nickel grades. |
| Testing | Visual and dimensional inspection, PMI on alloy and stainless grades, hardness; UT, MPI/DPI as specified |
| Documents | EN 10204 3.1 mill test certificate; 3.2 / third-party inspection when the order specifies; dimensional inspection report; IBR certification when specified |
Applications
- Instrument and pressure gauge connections on headers
- Vent and drain branches
- Sampling points
- Relief valve inlets on process lines
- Branches on insulated lines needing stand-off
Weldoflange vs nipoflange
A weldoflange is short: the flange sits close to the run pipe and the base is butt-welded like a weldolet. A nipoflange has a long body that lifts the flange clear of insulation or other obstructions, and its base can be set on or set in the run pipe. Choose by the stand-off you need and the header wall thickness.
Technical data sheets
FAQ
Weldoflange & Nipoflange: common questions
Is there an MSS standard for weldoflanges and nipoflanges?
Not for their full dimensions. MSS SP-97 covers integrally reinforced branch outlets such as weldolets, but flanged outlets like weldoflanges and nipoflanges are made to manufacturer standard. The flange end follows ASME B16.5.
What do I need to specify?
Run pipe size and schedule, outlet size, flange class and facing, material, and for a nipoflange the overall length. Teshi Group quotes in 24–48 hours.
Why use a nipoflange instead of a nipple and flange?
It removes the nipple-to-flange weld, reduces fit-up and inspection time, and gives a stiffer branch that better resists vibration, which helps on small-bore connections from pump and compressor headers.
Can weldoflanges be supplied in alloy steel?
Yes. They are made in ASTM A182 F11 and F22 for high-temperature service, as well as A105, A350 LF2 and stainless grades, with the base contour and bevel matched to the run pipe.
Need a size or grade not listed here?
Our engineering team manufactures against your drawing or datasheet, with dimensional sign-off before dispatch.
Send us your specificationTraceability
From mill heat to your site
- 01
Approved mill material
Received against the mill certificate; heat number registered.
- 02
Forging & machining
Heat number carried through every stage in our Indian works.
- 03
PMI, dimensional & NDT
Every lot inspected to the governing standard; TPI witness on request.
- 04
Stamped & certified dispatch
Hard-stamped pieces with EN 10204 3.1 / 3.2 certificates.
Quick RFQ
Quote for Weldoflange & Nipoflange in 24–48 hours
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