OEM manufacturer ASME B31.4 / B31.8 / B31.3 (design) · Manufacturer standard / client drawing
Anchor Flanges — Designed to Drawing
An anchor flange is a forged, one-piece ring with weld ends on both sides that is welded into a pipeline and embedded in concrete to resist axial movement. There is no ASME dimensional standard for anchor flanges; Teshi Group manufactures them to client drawings designed for the pipeline's thrust and thermal loads.
Also called: pipeline anchor flange, anchor ring, puddle flange (forged), thrust anchor flange
What is an Anchor Flange?
Anchor flanges fix a pipeline in place at points where axial forces would otherwise move it, such as where a buried line rises above ground, at pig traps, at compressor or pump stations, and at changes in direction. The flange is a thick ring forged integrally with two weld necks; the ring is cast into a concrete anchor block and the necks are butt-welded to the pipe. Dimensions are derived from the pipeline's design loads under ASME B31.4, B31.8 or B31.3, and the weld ends are matched to the line pipe grade and wall thickness.
Key features
- One-piece forging: ring plus two weld necks; no fillet welds
- Weld bevels to ASME B16.25 matched to line pipe wall
- High-yield grades to match API 5L X52–X65 line pipe
- Ring size and thickness from client load calculation
- Charpy impact testing at specified temperature when required
Specification
| Supply | OEM manufacturer — Teshi Group, India |
|---|---|
| Standard | No ASME dimensional standard; design to ASME B31.4 / B31.8 / B31.3; dimensions to client drawing |
| Size range | To order, matched to line pipe NPS and wall thickness |
| 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. |
| Weld ends | Bevel to ASME B16.25; bore matched to line pipe |
| Testing | Visual and dimensional inspection, hardness, UT and MPI; Charpy impact when specified |
| Documents | EN 10204 3.1 certificate; 3.2 / third-party inspection when the order specifies; dimensional inspection report |
Applications
- Buried oil and gas transmission pipelines
- Pipeline above-ground/below-ground transitions
- Pig launcher and receiver stations
- Compressor and pump station tie-ins
- Water transmission mains
Material grades
All gradesFAQ
Anchor Flange: common questions
Is there a standard for anchor flange dimensions?
No. Neither ASME B16.5 nor any MSS standard dimensions anchor flanges. They are designed for the axial thrust of each pipeline under ASME B31.4, B31.8 or B31.3, and made to the resulting drawing.
What material should an anchor flange be?
It should be weld-compatible with the line pipe and at least match its strength. For API 5L X52 to X65 line pipe, ASTM A694 F52 to F65 forgings are commonly used; A105 or A350 LF2 suit Grade B pipe.
What information is needed to make an anchor flange?
Line pipe size, wall thickness and grade, design thrust or the anchor drawing, ring OD and thickness, neck lengths, design temperature and any impact test requirement.
Is an anchor flange the same as a puddle flange?
They serve a similar purpose. A puddle flange is often a plate ring welded onto pipe through a concrete wall to stop water seepage; an anchor flange is a forged, load-bearing ring for pipeline thrust.
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.
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