RF Tubing Flange

QS Flange: Wuxi RF Tubing Flange

Forged stainless steel RF tubing flange, 4 inch 150LB SO per ANSI B16.5, joins equipment or pipe by fillet weld in corrosive service.

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One-Minute Overview

SO-type RF tubing flange that welds to equipment or pipe with a fillet weld.
Forged stainless steel, 4 inch, 150LB, dimensioned to ANSI B16.5.
Raised face gives a standard sealing surface for 150LB gasket arrangements.
High corrosion resistance suits corrosive process lines and outdoor exposure.

The RF tubing flange ties a 4 inch line into equipment or a pipe run with a simple fillet weld. Forged stainless steel carries the 150LB pressure rating, and the raised face matches standard 150LB gasket arrangements. Every dimension follows ANSI B16.5, so the flange lines up with standard weld neck, slip on and socket weld flanges of the same size and class, and the SO type keeps fit-up straightforward on site.

Name: RF Tubing Flange
Size: 4"
Pressure: 150LB
Material: Stainless Steel
Flange Face: RF
Type: SO
Standard: ANSI B16.5
Process Method: Forged

Install the flange where a line must be welded straight onto a pump, vessel or header: the fillet weld saves the fit-up time of a butt-welded neck, and the SO type slides over the pipe before welding. Stainless steel resists corrosion in chemical and water service and stands up to outdoor exposure, so the joint keeps its sealing face instead of rusting into the gasket. Select the gasket for the media, bolt with the fasteners of the matching 150LB class, and tighten in a star pattern. Where the line is expected to be opened later, plan the bolt circle clearance before welding.

FAQ

Q1. Which standard covers the dimensions of this tubing flange?

ANSI B16.5 governs the dimensions, drilling and raised-face finish of this 4 inch 150LB flange. Following that standard keeps the bolt circle and facing compatible with standard weld neck, slip on and socket weld flanges of the same size and class, so the joint needs no adapter plate and no special gasket.

Q2. How do I actually attach it to my equipment?

You weld it on with a fillet weld. The SO type slides over the pipe or sits against the equipment nozzle, and the fillet weld along the hub locks it in place. That saves the careful fit-up of a butt weld, which is handy on site when the line has to be lined up quickly.

Q3. Why stainless steel - will plain carbon steel not do the job?

Plain carbon steel will hold the pressure, but it rusts - and a corroded sealing face is the fastest way to ruin a gasket. The forged stainless steel body resists corrosion in process water and chemical service and outdoors, so the raised face stays smooth and the joint keeps sealing.

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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