Steam main vents

TGO_22

I am doing a boiler replacemant on a steam system that still has the mains in a loop. I will be splitting the loops and putting in separate drops to the returns as part of the job. The way the piping is layed out one side will be almost twice as long as the other. The capacity of the newly created mains will be 1.44 cubic feet and 2.34 cubic feet. Do I need more venting on the longer run or will a large capacity vent like a Hoffman #75 or a Gorton #2 get the air out fast enough? How do you guys feel about Y strainers before the vents? Thanks for your input.

Steamhead

First, some vent capacities:

> I am doing a boiler replacemant on a steam system

> that still has the mains in a loop. I will be

> splitting the loops and putting in separate drops

> to the returns as part of the job. The way the

> piping is layed out one side will be almost twice

> as long as the other. The capacity of the newly

> created mains will be 1.44 cubic feet and 2.34

> cubic feet. Do I need more venting on the longer

> run or will a large capacity vent like a Hoffman

> #75 or a Gorton #2 get the air out fast enough?

> How do you guys feel about Y strainers before the

> vents? Thanks for your input.





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Steamhead

First, some vent capacities:

The Hoffman #75 is actually equal to the Gorton #1. Both will vent about 1.4 cubic feet per minute (CFM). The Gorton #2 will vent about 5 CFM.

You could get away with a pair of Gorton #1 or Hoffman #75 vents on the long main and one on the short one. But if I were doing that job, I'd put two of the above on the short main and a Gorton #2 on the long one. This would make the mains vent at a slightly lower pressure than the radiators, helping make sure the steam reached the ends of the mains before rising to the radiators.

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[Deleted User]

i think strainers are great

but be carefull how you position it..you dont want the strainer cavity to hold condensate, which it wont do until the second time the system fires, cause the first time its empty..thats just enough time for you to think the systems working and leave, only to get a phone call an hour later..oops, doesn't it sound like i learned that one the hard way....hehe

TGO_23

Thanks for the

input. I was figured I should increase the vents for tha longer run, now I'm sure of it. Thanks again