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Pipe/Pipe Fittings

Pipe fittings classification based on the end connections

1. Socket weld/ Screwed end fittings: 

The socket weld/screwed fittings are generally forged.

The different grades of material used for these fittings are:

ASTM A105-Forged Carbon Steel

ASTM A181-Forged Carbon Steel for General purposes

ASTM A182-Forged Alloy Steel and Stainless Steel

ASTM A234-Wrought Carbon Steel and Alloy Steel pipe fittings for moderate and elevated temperatures

ASTM A350-Forged Alloy Steel for Low temperature Services

2. Butt weld end fittings:  

Dimensional standard-AME B 16.9/ AME B 16.28/BS 1640

These are fittings are with Butt welded ends.

They are available in both seamless and welded type. They are usually with the same thickness as pipe.

The different grades of material used for these fittings are:

ASTM A234- Carbon Steel Fittings for Moderate & High temperature Services.

ASTM A403- Austenitic Stainless Steel Pipe Fittings.

ASTM A420- Carbon Steel & Alloy Steel Pipe Fittings for Low temperature Services.

3. Flanged end fittings:

Dimensional standard-AME B 16.5/BS 1650

These kind of fitting have both ends Flanged and are used in places where welding is not allowed.

They are cast fittings.

The different grades of material used for these fittings are:

ASTM A216- Carbon Steel Casting.

ASTM A403- Stainless Steel Casting.

ASTM A420- Alloy Steel Casting.