Cast Iron vs. Mallable for steam and condensate (low press.)

steve_164

What are the proper fittings to use on low pressure steam and condensate? I have seen cast iron 250# and mallable 90's. Can you use both?

EBEBRATT-Ed

For low pressure steam standard 125# cast iron fittings have been the standard for years. 150# malleable iron fittings are fine if cast iron is not available, in fact some fitters prefer malleable fittings. The basic difference is you can't break malleable fittings with a hammer and pipe wrenches are less likley to slip on malleable fittings.

ED

Al Corelli_2

NYC

Inspectors in NYC are looking for steam fittings on water and steam boilers.

Had to change out 1 elbow (had no more steam fittings in the truck that day) at the drip end of a header.

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bovide_4

wish I knew

I have an email from the DOB boiler div. chief stating that there is no rule prohibiting malleable fittings on steam. Funny thing is, I have yet to use malleable on steam.