more venting for larger radiators

John Shea

I've read what Dan H. has to say about venting large radiators more than small ones on a one-pipe system.

How would (or could) you increase venting on a two-pipe system's 'large' radiator when there's one thermostatic trap on it?

What about adding a 'one-pipe' air vent?

Steamhead

Use

a trap that will pass more air. What's on there now?

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John Shea

It's a Warren-Webster 512HB housing.

The seat and bellows have just been replaced with a Barnes & Jones cage unit #1998.

John Shea

any ideas?

[Deleted User]

Check for a

metering orifice in the radiator supply valve.

John Shea

A TRV was installed some time ago, however, it is fully open.

Chuck Sorce

To quote the master

>>>What about adding a 'one-pipe' air vent?<<<

I am by no means qualified to give advice, however to quote from Dan's "We Got Steam Heat":

"Air vents have no business being on two-pipe radiators. These radiators have steam traps and an air vent can hide the symptoms of a failed steam trap, causing you big problems down the road as water hammer tears your system apart. Never let anyone add air vents to your two-pipe radiators."

Steamhead

Took me a while, sorry

Try the Barnes & Jones #122 angle trap. I've used this several times on larger radiators. It has a bigger cage unit than the typical one used for rebuilding older traps, so it should pass more air.

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John Shea

no apology necessary.

I would assume then that 2 Gorton #2s will vent more than one Hoffman #75?

Thanks for your help Steamhead.

Steamhead

Yes

one Gorton #2 will vent 4 times as much air as a Hoffman #75, so two will vent 8 times as much.

The main similarity between the Gorton #2 and the Hoffman #75 is- they cost about the same.

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