asme water heater

Ben_3

With commercial water heaters the diff. is also the size and btuh. Any water heater that is not asme rated can not exceed 120 gal. and 200,000 btuh. This is why you find water heaters that are 119 gal. and 199,990 btuh. Any size larger and is has to be ASME rated.

sam_2

asme water heater

what is the differents between a water heater that is asme cert or one that is not, i can tell there is a big price differents

[Deleted User]

theoretically the quality....

asme...A Substantial Monetary Exchange as mr. yates would say.

[Deleted User]

And...

water temps over 180 degrees F. If you exceed any one of these parameters, the appliance must have A.S.M.E. certification.

This includes situations where the tank is being used as a storage tank on a side arm heater. So, if the coil has the ability to produce more than 4 GPM @ a 100 degree rise, then the tank MUST be ASME. (Been there, done that, had to replace it at my own expense)

Another funny answer for the acronym is Always, Sometimes, Maybe, Except!! (Thanks TC)

ME

Tony Conner

There Are...

...almost always local jurisdictional spins on various rules and regulations. Always a good idea to check BEFORE expensive stuff gets bought & installed, or you've got a lot of pipe hung. Very disappointing to be told "Well, you can't do that HERE in XYZ." after the job is half in.

A LOT of the inspectors in any given jurisdiction aren't all on the same page, either. That's why I LOVE email for playing Q&A with these guys. A record of exactly what was said, when, and by whom.

Paul Rohrs

Weld's

I believe some of the criteria has to do with the welding of the tank. I recall that the tank has to be welded and documented by an ASME certified welder.

Translation.....more money.

PR

Tony Conner

Everything...

...has to be documented - the specs for the tank material, welding rod/wire & flux, voltage/amperage on the welding machines, who actually did the welding process (normally highly automated), the results of the required testing, etc. Then there's the liability aspect if a tank fails catastrophically, somewhere.

Something that happens on a lot of construction sites with steel piping for high pressure service, is that the correct grade is (maybe) spec'd. Even if it gets ordered properly (a 50 - 50 chance, at best), the WRONG (as in lower grade/cheaper) stuff shows up, because nobody at the suppliers knows the difference. Nobody on the site knows to check. All that normally gets done is to count the lengths, and look at the size/schedule. A whole lotta people don't know what the mill code numbers stencilled on the pipe walls mean anyway, so they CAN'T check. There are some really, um..."intersting" installations out there.