Buttweld elbow

buttweld elbow

What is buttweld elbow?

They are a type of fitting when installed, can connect a piping system, and can the direct flow of media to a certain degree.

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Types of ASME 16.9 elbow based on connection with pipe

Elbows can have flanged, threaded, socket weld or butt-welded connections to pipelines.

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Thickness requirement of buttweld reducing elbow

Though the minimum thickness of the elbow is 1.10 mm, the average thickness for a buttweld reducing elbow is approx 1.20 mm.

Seamless elbow and welded elbow construction as per ASME B16.9 standard, metal pipe elbow available in in schedule 40/ 80 to XXS

Features of butt weld 90 deg elbow

They have a low overall cost for two reasons – carbon steel is relatively inexpensive and making buttweld fittings requires 10% to 75% less material for their manufacture. A butt weld elbow has a good heat resistance and exhibits good toughness. Since they are hard, the elbows are dimensionally accurate, even under high pressures.

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How are steel butt welding elbow installed?

All buttweld fittings have a bevelled edge. This edge permits full penetration of the pipe into the fitting such that the two form a snug connection. When the pipe is fitted into a Steel Butt Welding Elbow, welding is carried out around the circumference of the fitting to ensure a permanent, leak-proof and secure connection. Depending on the steel grade, pre-weld and post-weld heat treatments are given to the connection. The last step of installing the elbow is cleaning the welded area to prevent intergranular corrosion.

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What is BW elbow manufacturing process?

In total there are four techniques used to manufacture a Buttweld Elbow, out of which the mandrel process is significantly used. The raw material is first heated and pushed over a die (or mandrel), which causes the pipe to expand and bend at the same time. The fittings are then treated with heat and may be coated to improve their mechanical and corrosion resistance properties.