Socket Weld Flange Fabrication

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Fabricated Flanges

Benchmark has supplied and fabricated a wide variety of piping products in support of the Oil & Gas Industry, LNG Plant Construction, Marine Services and Pulp / Paper Plants.

All of our custom fabricated steel flanges come in a wide variety of carbon and stainless steel including 304 and 316 SS fabricated flanges. Our flanges are custom fabricated in Vancouver BC and are made with a variety of metals.

The variations of assemblies we have deployed are enormous, however typically a piping assemble consists of the following basic components:

Piping, Flanges, Valves, Fittings, Stud Bolts, Gaskets, Isolation Kits and Pipe Spools AKA Flanged Spools.

Socket Weld flange

socket weld flange

1. Socket Weld flange
2. Filled weld
3. Pipe
X = Expansion gap

Socket Weld flanges were initially developed for use on small-size high pressure piping. Their static strength is equal to Slip On flanges, but their fatigue strength 50% greater than double-welded Slip On flanges.

The connection with the pipe is done with 1 fillet weld, at the outside of the flange. But before welding, a space must be created between flange or fitting and pipe.

ASME B31.1 1998 127.3 Preparation for Welding (E) Socket Weld Assembly says:
In assembly of the joint before welding, the pipe or tube shall be inserted into the socket to the maximum depth and then withdrawn approximately 1/16″ (1.6 mm) away from contact between the end of the pipe and the shoulder of the socket.

The purpose for the bottoming clearance in a Socket Weld is usually to reduce the residual stress at the root of the weld that could occur during solidification of the weld metal. The image shows you the X measure for the expansion gap.

The disadvantage of this flange is right the gap, that must be made. By corrosive products, and mainly in stainless steel pipe systems, the crack between pipe and flange can give corrosion problems. In some processes this flange is also not allowed. I am not an expert in this matter, but on the internet, you will find a lot of information about forms of corrosion.

Also for this flange counts, that principle always firstly a pipe must be welded and then just a fitting.

Please contact us today for more information about our wide range of Piping Products and Fabricated Piping Products. If you don’t see the type of gasket you need here? Not to worry! Benchmark has local stock on hundreds of types of Piping Products not listed and are updating our online inventory daily. What’s more if we don’t have it we will find someone who does and deliver to your site as fast as same day if possible.