Tubing Weld Neck Flange

QS Flange: Jiaxing Tubing Weld Neck Flange

Forged A182 F304 tubing weld neck flange, 4 inch 300LB RF, for high temperature and high pressure lines that need tight sealing.

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One-Minute Overview

Forged ASTM A182 F304 weld neck flange for 4 inch tubing and pipe joints.
Class 300LB with a raised face for a dependable gasket seal.
Strong stiffness and good sealing in high temperature and high pressure service.
A fit for oil and gas, chemical and petrochemical lines with strict sealing needs.

The tubing weld neck flange joins 4 inch tubing and pipe to matching equipment through a butt-weld neck that carries stress away from the joint. Forged from ASTM A182 F304 stainless steel and rated Class 300LB, it is made for lines where temperature, pressure and sealing all have to hold at the same time. The raised face concentrates bolt load on the gasket, and the forged body keeps the hub stiff under bending and thermal movement.

Name: Tubing Weld Neck Flange
Size: 4"
Pressure: 300LB
Material: ASTM A182 F304
Flange Face: RF
Process: Forged
Standard: ASME B16.5

Weld neck flanges are specified where a line runs hot, runs hard, or simply cannot leak: pump and valve connections, chemical transfer, refinery and wellhead tie-ins. The tapered hub gives strong stiffness and spreads stress into the pipe, while the forged grain flow improves fatigue life over cast bodies. Step up to Class 300LB when design pressure or temperature exceed Class 150 limits, and match the raised face to the gasket your joint calls for. Install by butt welding the neck to the pipe, then bolt up with the stud set for the class and tighten in a cross pattern to the gasket guidance so the RF seat loads evenly.

FAQ

Q1. What material and pressure class is this tubing weld neck flange built to?

It is forged from ASTM A182 F304 stainless steel and rated Class 300LB with a raised face. The forged body and weld neck hub give strong stiffness and good sealing in high temperature, high pressure service, which is exactly where this tubing flange belongs.

Q2. What does the raised face actually do for me?

It is the gasket's landing pad: bolt load concentrates on that raised band instead of smearing across the whole face, so the joint seals with less torque guesswork. It is the normal facing for 300LB joints and pairs with flat and spiral-wound gaskets alike.

Q3. Can I just bolt it up and hope for the best?

Hope is a poor gasket. Butt weld the neck to the pipe, check the weld, then tighten the studs in a cross pattern to your gasket's torque guidance and re-check after the first heat cycle. Do that and the flange will outlast the argument about who installed it.

Q4. What is the smallest order I can place?

Standard flange insulation gasket kits start at one set, and standard gaskets, studs, washers and sleeves start at one piece. Parts made to your drawing or to a non-standard bolt pattern are quoted one by one, because the minimum really depends on the material and the tooling involved.

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