Tubing SO Flange

QS Flange: FujianTubing SO Flange

Forged A182 F316 tubing SO flange, 4 inch 150LB RF per ANSI B16.5, for fillet-welded connections on tubing in corrosive service.

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One-Minute Overview

Forged A182 F316 slip on flange sized for 4 inch tubing and equipment connections.
150LB class with an RF face; dimensions follow ANSI B16.5.
F316 resists corrosive media in oil, gas and marine environments.
Installed by fillet weld directly to the tubing or nozzle — no butt weld prep.

The tubing SO flange gives 4 inch tubing runs a bolted end or branch connection that is quick to weld and easy to inspect. Forged from A182 F316 stainless steel, it combines the corrosion resistance needed for oil, gas and marine exposure with the strength of a forged pressure part. The raised face and ANSI B16.5 dimensions keep it compatible with standard 150LB valves, fittings and companion flanges.

Name: Tubing SO Flange
Size: 4"
Pressure: 150LB
Material: A182 F316
Flange Face: RF
Process: Forged
Standard: ANSI B16.5
Type: SO

Tubing lines in production skids, chemical transfer and marine service see wet CO2, chlorides and cleaning chemicals — the molybdenum-bearing F316 grade is the natural choice there. The slip on pattern is fillet welded to the tube or nozzle, so a crew can tack, align and finish the weld without the fit-up a butt-weld neck demands. Select the gasket for the RF facing, bolt to the class 150 pattern and torque evenly in a star sequence. Because the body is forged, it handles vibration and thermal cycling on moving skids well.

FAQ

Q1. Which standard covers this tubing SO flange?

Dimensions, pressure class and facing follow ANSI B16.5 for 4 inch Class 150 flanges, so the part mates with standard valves, fittings and companion flanges. The body is forged from A182 F316 stainless steel, and the raised face accepts the gaskets normally used on 150LB joints.

Q2. Why is it called a tubing SO flange?

SO means slip on: the flange slides over the tube or nozzle and is fixed with a fillet weld. The tubing designation just points to its usual home — 4 inch tubing runs on production skids and transfer lines where a fast, inspectable joint matters.

Q3. Will F316 survive my nasty service?

If by nasty you mean chlorides, wet gas or cleaning chemicals — that is exactly what F316 was made for. The molybdenum in 316 resists pitting far better than 304. For truly exotic media, send the chemistry and we will tell you honestly whether 316 is enough.

Q4. What's the minimum I can order?

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

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