Slip On Welding Flange

QS Flange: Slip On Flange Welding

Forged carbon steel slip on flange to ASME B16.5, 1/2 to 24 inch, Class 150-2500LB raised face with black surface treatment, welded onto water, oil and gas lines.

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One-Minute Overview

Forged carbon steel slip on flange, fillet welded over the pipe end.
ASME B16.5 dimensions, 1/2 to 24 inch, Class 150 to 2500LB, raised face.
ASTM A105 basis: yield strength 250 MPa or above, hardness up to 187 HB.
Black surface treatment on a flange aimed at water, oil and gas lines.

This slip on flange (Type SO) slides over the pipe and is fixed with a fillet weld, so the joint is made on site with ordinary welding equipment. It is forged from carbon steel to ASME B16.5, from 1/2 to 24 inch and Class 150 to 2500LB, with a raised face and a black surface treatment.

Name: Slip On Flange Welding
Type: SO
Size: 1/2"-24"
Pressure: 150LB-2500LB
Material: Carbon Steel (CS)
Flange Face: RF
Standard: ASME B16.5
Process: Forged
Surface Treatment: Black
Usage: Water Systems, Oil and Gas Pipelines

Carbon steel is chosen here for the same reasons it is chosen on most water and oil lines: it is strong, predictable and easy to weld. The page data gives the body an ASTM A105 basis, with yield strength at 250 MPa or above and hardness up to 187 HB. That pairing matters in two directions: enough strength to hold pressure without permanent deformation, and hardness low enough that the steel still machines, cuts and welds without fighting the tool.

Slip on flanges suit lines where the pipe can be cut square and the joint is reachable, because the fillet weld runs around the hub outside and, where the design allows, inside as well. Water systems, oil and gas pipelines and general industrial service are the stated uses, from 1/2 to 24 inch and up to Class 2500LB. The raised face takes the gasket, and the black treatment keeps rust off the outside in store and on site.

Welding procedure first: qualify it, clean the pipe end and the hub, and make sure the joint is dry before striking an arc. Carbon steel does not need the purge and the special consumables stainless does, but it does need the right electrodes and a joint free of mill scale and oil. Let the weld cool naturally, then check the face for distortion, because a flange pulled out of flat leaks no matter how carefully the gasket is fitted.

FAQ

Q1. What does the A105 basis mean for the flange body?

It sets the mechanical floor. On the page data the carbon steel body is rated to an ASTM A105 basis, with yield strength at 250 MPa or above and hardness up to 187 HB. In practice that means the flange holds its shape under pressure and pressure swings, while still being soft enough to machine cleanly and to weld without cracking.

Q2. How should the weld be sequenced on site?

Cut the pipe square, slide the flange on, set the face-to-face distance, then tack in four places and check for square before welding out. Weld in balanced passes, alternating across the hub so the heat does not pull the face out of flat, and let it cool naturally. Fit the gasket only after the joint is cold and the face has been checked.

Q3. What does the black treatment protect?

The outside of the body. It is a surface treatment that improves corrosion resistance and durability in store and on site, which is what the flange needs on a water, oil or gas line where the outside sees weather and washdown. The machined raised face stays bare, because that is the sealing surface and must sit clean against the gasket.

Q4. How long will production take?

Standard sizes are typically ready within 30 days, and in-stock items ship immediately. Larger or custom orders get a confirmed date per order, because the schedule depends on quantity, material, the bolt pattern you specify, and how busy production is at the moment you order.

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