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Weld Neck Flange Adapters

Weld Neck Flange Adapters

Pressure Class: Class 150 – Class 2500
Standards: ASME B16.5, B16.47
Material: A105 Carbon Steel, A182 F11/F22 Chrome-Moly, A182 F304/F316 Stainless
Neck Design: Long tapered hub
Size Range: 1/2" – 60"
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Product Parameters

 

Item Specification
Pressure Class Class 150 – Class 2500
Standards ASME B16.5, B16.47
Material A105 Carbon Steel, A182 F11/F22 Chrome-Moly, A182 F304/F316 Stainless
Neck Design Long tapered hub
Size Range 1/2" – 60"
MOQ 10 pcs

 

description

 

Weld neck flange adapters have a long tapered hub that makes them the right choice for high-pressure and high-temperature applications. The taper distributes stress away from the weld joint - the area most vulnerable to fatigue failure under cyclic pressure and thermal loading. ASME B16.5 and B16.47 govern dimensions and pressure ratings from Class 150 through Class 2500. The pressure class you need is determined by your system's maximum working pressure and temperature. A105 forged carbon steel handles ambient temperature service. A182 F11 or F22 chrome-moly takes on temperatures above 450°C - refinery and power work where carbon steel would soften. A182 F304/F316 stainless when the media would attack carbon steel.
product-1376-768

 

Weld Neck vs. Slip-On - Where the Taper Matters

 

The tapered hub of a weld neck flange does two things a slip-on flange cannot: it distributes the weld stress away from the weld joint, and it reinforces the pipe against collapse under external loads. In high-pressure cyclic service, the taper reduces stress concentrations at the weld root and absorbs differential expansion. Use slip-on flanges for low-pressure, non-cyclic service where cost is the primary concern.

product-1376-768

 

FAQ

 

Q1: MOQ?

A1: 10 pieces.

Q2: Pressure classes?

A2: Class 150 through Class 2500 per ASME B16.5.

Q3: Materials?

A3: A105 carbon steel, A182 F11/F22 chrome-moly alloy, A182 F304/F316 stainless.

Q4: RT examination?

A4: Yes. Available for critical service in oil and gas and chemical processing.

Q5: Backing rings for field welding?

A5: Yes. Backing rings or chill rings available.

Q6: Size range?

A6: 1/2" through 60" diameter.

 

Quality is non-negotiable in precision manufacturing. Every component undergoes rigorous inspection at each stage of production.

  • ISO 9001:2015 - Quality management system covering design and manufacturing
  • API 6D / API 600 - Design and testing compliance for valve components and flanges
  • Hydrostatic Pressure Testing - Every valve body pressure-tested to 1.5× rated pressure
  • MPI / LPI - Magnetic particle and liquid penetrant inspection for weld integrity
  • CE / ATEX - Pressure equipment directive compliance for EU market available
  • Passivation / Electropolishing - ASTM A967 procedures for corrosion resistance
  • Material Traceability - Heat number tracking from raw material to finished part
  •  

From raw material to finished product, every step is controlled and documented:

  • Billet Heating - Precision heating to forging temperature with temperature monitoring
  • Forging - Closed-die, open-die, or ring rolling to near-net shape
  • Trimming / Piercing - Flash removal and bore operations
  • Heat Treatment - Through-hardening, case-hardening, or age-hardening as required
  • Finishing Machining - CNC machining, grinding, or super-finishing to final dimensions
  • Surface Treatment - Anodizing, plating, or shot peening as specified
  • Inspection & Testing - Dimensional check, hardness testing, surface inspection
  • Cleaning & Packaging - Degreasing, rust prevention, and protective packaging

 

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