Screwed Welded Fittings

These Screwed Welded fittings perform the same function as the Butt-Weld Fittings. There fittings function is the same but the method of joining & the dimensioning is different. Normally these welded fittings are used in sizes 1-1/2" (or 2") and smaller. Welded fittings are specified the same as the pipe by weight schedule or wall thickness. Screwed & Socket-Weld fittings are specified per the pressure class. Thread engagements as welbow as the Depths of the sockets for different pipe sizes are different & must be looked-up on an approved dimension table.

Threaded fitting pressure classes:
* 125# Cast Iron
* 250# Cast Iron
* 150# Malleable Iron
* 300# Malleable Iron
* 2000# Forged Steel *
* 3000# Forged Steel *
* 6000# Forged Steel

The Cast Iron & Malleable Iron fittings are basically used for air & water services at a low temperature and pressure. Forged fittings are normally used for higher pressures and temperatures as welbow as for the more complex commodities.