1/8 port on air separator used to pipe to expansion tank

streit

Is it okay to use 1/8 port on top of B&G 1AS-1 as connection point to steel expansion tank on basement ceiling or should I buy next size up which has 3/4 opening on top? Thanks.

DanHolohan

The 1/8th tapping is too small for that. Go with the 3/4

streit

Okay. Thanks. Also, do I need a minimum section of straight pipe prior to air separator. Thanks. Mark

DanHolohan

I don't know if B&G specifies that. Maybe someone else will pop in.

Steamhead

I believe that air separator needs 18" of straight pipe going in, though I can't find anything quickly online to verify this. Most air separators of this type do.

If you don't have that, go with the EAS-1 which IMHO is a much better unit. It also lets you pipe it either in a straight (like the IAS) or angle pattern.

streit

Thanks for the info.

hot_rod

The "old school" air purgers really don't have a place in modern hydronic systems. The do little if anything to remove micro bubbles. They are also flow and position sensitive.

The best rule of thumb you must use them is 12 pipe diameters upstream. 18" is fine for sizes up to 1-1/2", which covers most residential stuff.

Invest in a good micro-bubble remover, for quiet, hi-efficiency operation.

Steamhead

Here's the EAS info. I believe this would be considered a microbubble type:

http://documentlibrary.xylemappliedwater.com/wp-content/blogs.dir/22/files/documents/2012/02/A-600A.pdf

We like the EAS as it can be used with either a plain steel or a diaphragm-type tank.

dad173

Can anyone help me I have a gas steam boiler and I didn't even turn my heat on yet but I keep losing the water in the sight glass and there are no signs of the boiler being cracked the water is just disappearing

Zman

@dad173
It sounds like you have a new question about a steam boiler.
You will get better feedback and less confusion if you repost it in strictly steam as it's own post.