Socket Weld Pipe Flange

QS Flange: Quanzhou Socked Weld Pipe Flange

SS316 socket weld flange with a raised face and 300LB rating, 1/2 to 24 inch to ASME B16.5, where the pipe sits in the socket and one fillet weld seals it.

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One-Minute Overview

Socket weld flange with a recessed bore that receives the pipe end before one fillet weld.
SS316 body rated 300LB, raised face, dimensions following ASME B16.5.
Forged in sizes from 1/2 to 24 inch for water, oil and gas piping.
Chosen where space is tight and the joint stays closed for long periods.

The socket weld pipe flange, type SW, holds the pipe in a machined socket and seals it with a single fillet weld on the outside. The body is forged SS316 stainless steel with a raised face and a 300LB rating, and every dimension follows ASME B16.5. Sizes run from 1/2 to 24 inch, so one design covers small instrument lines as well as larger process branches in water systems, oil and gas pipelines.

Name: Socket Weld Pipe Flange
Type: SW
Size: 1/2-24 Inch
Pressure: 300LB
Material: SS316
Flange Face: RF
Standard: ASME B16.5
Process Method: Forged

Installation follows the socket geometry rather than the pipe run. The pipe is cut square and cleaned, then pushed into the socket to the insertion depth given in ASME B16.5, which is about 1.5 times the pipe outside diameter. A gap of roughly 1.6 mm is left between the pipe end and the bottom of the bore, so thermal expansion and welding stress have somewhere to go instead of cracking the root. The fillet weld is normally single sided, with a throat near 1.25 times the pipe wall thickness. That geometry is why SW flanges suit small diameter lines and crowded skids: no bevelling, no line-up clamps, and the socket sets the alignment by itself. SS316 carries the corrosion resistance and strength the grade is chosen for, while the 300LB class leaves headroom over a 150LB joint. Let the assembly cool between passes, wire brush the weld, and bolt to the mating flange with a gasket suited to the service.

FAQ

Q1. How is the pipe actually fixed into this flange?

The pipe end goes into the socket machined in the flange bore, to the insertion depth set by ASME B16.5, about 1.5 times the pipe outside diameter. One fillet weld then runs around the outside joint, with a throat near 1.25 times the wall thickness. No bevelling and no butt weld preparation are needed.

Q2. Do I really have to leave that 1.6 mm gap at the bottom?

Please do. The gap is there so the pipe end and the bore bottom are not forced against each other when the joint heats up and the weld cools. Push the pipe all the way down and that allowance disappears, which is exactly when root cracks start. About 1.6 mm, measured before welding.

Q3. Why SS316 and a 300LB class instead of the usual 150LB carbon steel?

Two reasons, and neither is decoration. SS316 gives the corrosion resistance this grade is picked for in water, oil and gas service, so the flange survives media that would eat carbon steel. The 300LB rating simply leaves more pressure headroom than a 150LB joint, which matters when a line is upgraded later.

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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