Main Vent

Chemeclimber

I use Hoffman No 75 as my main vents for my vapor system. For the long main, I actually have a "christmas tree" with three of them.

The problem is, they (two out of the three) keep sticking open. Every time I go down the basement, steam is leaking out. If I tap on them just a little, they snap closed.

Anyone have similar problems? What can I try?

I called Hoffman, and they said they are installed incorrectly. I think the gal I spoke to did not understand what I was saying or even the product. They were not helpful at all. They can't be installed wrong, because my man Steamhead put them in.

John@Reliable_5

You could try..............

cleaning them with CLR? to remove what has built up on them over time.Or maybe better is a call to steamhead again.

scrook_2

or...

if the CLR doesn't clean'm up, replace the tree w/ a single Gorton #2, up on a nipple to get it away from the main a bit. I should vent as fast as 4 or 5 #75's. Keep the good #75 as a spare for the short main and toss the other two.

Chemeclimber

I had a Gorton #2 on there before these, but it did not work either. The Gorton would not vent (open) unless the temp went down close to 70 degrees. Therefore, this main would not vent properly.

Dave_23

Really?

I have three Gorton #2's in my boiler room, which typically is about 100 degrees F, during a heat cycle. Is it possible that the Gorton's are closed due to high ambient temp? This would be a MAJOR problem. Does Gorton identify at what temp its vents close?

Fred Harwood

vent opening

Yes, Gorton main vents benefit from some thermal isolation from the main. If mounted too close, thermal conductivity and the warm environment sometimes combine to hold the vent closed between close cycles. Mount the #2 in a black-iron stub to reduce conductivity, or pipe it a little bit further away in the direction of a cooler environment.

Steamhead

Hi Joe

The most likely cause is dirt getting into them. I remember it was a while before you stopped getting a lot of dirt when you blew the LWCO down. Try boiling them in vinegar to clean them if you haven't already. If that doesn't work, a "Y" strainer in the riser to the vents may help.

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