Steam piping arrangement

Steamhead (in transit)

the return line go? Can air get out of it? You have the right idea, but the air will come out of the coil and enter the return, and there has to be a way to vent it.

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Anthony Piscitelli

Steam piping arrangement P-Tac unit

I was hired as the mechanical piping contractor to connect existing 3/4" supply and 1/2" return to newly installed McQuay P-Tac units with a steam coil. Stem coil is of the horizontal type and is located at the uppermost part of the unit and is 1/2" copper fin. Job is spec'd out to be 1/2" zone valve on supply side of coil - existing steam system is 2 pipe low pressure. The steam inlet is located approx 4-6" above the coil and the return is at the floor - it is 3/4" copper supply which was orginally 3/4" black pipe and was adapted to copper at some point. In order to fit zone valve in unit I must drop down and be forced to go back up to feed coil. I know this will trap my steam supply - my experience tells me to put a drip leg on the low part of the supply and install and F & T trap and connect to the return by gravity. Return line is 1/2" copper which I will install a thermostatic trap on the return side. My experience also tells me that the F & T trap outlet should be on the downstream side of the termostatic trap. Please forward piping diagram and advise if my exerience is leading me in the right direction. There are several units at this site that need to be done in this manner. Please respond to certifiedph@aol.com Thank you for your help.