Best Of
Re: Boiler Header Manifold
I have had that issue. They make nice skis when your done. Never tried the water trick.
Only way I ever found was to heat the 4" to relive the stress. Putting the tapping on opposite sides of the pipe would help balance things out but you can't always do that.
Instead of using thread-o-lets they make pipe-o-lets which are much lighter and have less mass and don't require as much weld metal so you get less shrinkage
Re: Draft
This may not be what you are discussing about draft but a lot of the very old gas burners relied strictly on a good draft to provide the needed air for proper combustion. There were no fans or blowers to provide the correct amount of combustion air, just a good draft.
Re: ASME requirements
This is my understanding but I have been out of the loop for a while.
my understanding with expansion tanks is they need an ASME rating if the relief valves on the system are rated over 30psi. 30psi reliefs and under do not require ASME expansion tanks.
As far as indirects go I thought the reason for the 119 gallon tanks was that 120 gallons or more require ASME and under 120 does not.
In both the above situations that is why you see on larger jobs you sometimes see multiple 119 gallon indirects and multiple non ASME expansion tanks.
Re: Rust in one pipe system
Do you keep up on repairing any steam leaks ? With steam leaks the water will escape out of the system and leave the minerals (solids) behind . Hi iron water would leave a redish color mud in the boiler .
Big Ed_4
Re: Material price increases due to govermental tarrifs
The fed can't raise the money supply 28% without causing inflation. Stopped at the deli for breakfast lately?
Re: Remove PTAC unit for servicing
They'll have to support the H W coil or remove it.
it should have unions to service it anyway
pecmsg
Re: Remove PTAC unit for servicing
That looks like a modified PTAC to me. I've done plenty of PTAC"S and never seen the hot water coil on the discharge, external to the unit. Generally PTAC"S are a packaged unit that slides out of their casing so it can be repaired. preferably on a bench. Take the old one out and slide another one that's already been repaired. Maybe that's so old and that how they did it. looks like it will still slide out if you can support the coil. hang it from the window sill. might have to call McGyver
pedmec
Re: Rust in one pipe system
Any pipe above the boiler water line usually lasts forever. It's just the pipe below the water line that causes issues.