They are used only in conjunction with ANSI pipe and are available in the same size range. They are used in areas where pipe-work is permanent and are designed to provide good flow characteristics.
Fittings may be made from forgings, bars, plates, or seamless or welded tubular products, provided the materials conform to the chemical composition requirements of ASTM A240.
The steel may be melted by electric- furnace, or vacuum-furnace, or by either of these followed by vacuum or electroslag- consumable remelting.
Fittings may be formed by hammering, pressing, piercing, extruding, upsetting, rolling, bending, fusion welding, machining or any combination of these processes.
All fittings are heat treated in accordance with the heat treatment table. All welding must be done prior to heat treatment.
Manufactured to dimensions and tolerances in ANSI B16.9 with the exception of short radius elbows and return bends which are made to ANSI B16.28. Light-weight corrosion resistant fittings are made to MSS SP43.
Available to ASTM A403, ASTM A815 and MSS SP43. These standards require the fittings to be manufactured as follows:
The full identification of the fitting should be marked on it including:
