Piping relief valve for a high temp. and high pressure boiler

Blackoakbob

asmecode and they have a sight that sells the books. If you have a current state plumbing code book that will have rules for "special wastes" requirements. I believe you will need a flash tank of sufficient volume with cooling water that will drop the waste to a safe temp for disposal.
You should be able to drain all of the waste lines to this tank as you will be flushing lwco's and blowdowns, etc. You can check with Sterling or Hoffman, they may have just what you require. Best Regards

Tony Hajjar

Piping relief valve on high tem. high pressure boiler

We are in the process of install two (2) 60 Hp water boiler @280 deg F and one (1) 20 Hp steam boiler. Drain piping is PVC. How do we pipe the relief safety valve?

Thanks

Gary Fereday

You had best place

a Flash or Blowdown tank before the drains as that hot water (steam) will destroy the plastic piping. Now that big of a boiler will have to be inspected by an insurance company. It may well be that a seperate Flash tank wil be needed for the safty relief valve, it is up to the inspectors. as most relief valves would not be allowed to go anywhere except onto the floor in the same room that the boiler was in. Some are piped through the roof, but a seperate means of draining that pipe has to be set up to prevent the pipe from freezing closed. That big of a boiler should have had an engineer design the whole thing and its piping. I hope this helps

Tony Hajjar

Tony Hajjar

thanks Bigugh,

The engineer for this job is in Europe. He is not familiar with the USA Code. The local inspector refered us to the state. The state refered us to the ASME Code Book, Section 1. We don t own. How else could we get info?

Thanks

Tony Conner_2

Piping...

... like this typically falls under the ASME B31.1 Power Piping Code, and quite possibly under the section "Boiler External Piping" of that code, which has a higher level of requirement again.

It's ultimately the owners' responsibility to make sure that things get installed as per the applicable code(s). Why would anybody hire a engineering outfit who doesn't actually - y'know - HAVE the applicable code book, to design an installation like this? Were the boilers themselves constructed to ASME Code standards, and do they have the applicable stamped nameplates and documentation? If they don't, there's not likely much reason to install anything else until that's cleared up.

Larry C

Didn't say what the high temp boilers were for. Do they really need 280. If they can settle for under 250 it can be kept as a low pressure application.

Cover your tail and let a good heating engineer write it up in detail

Let us know what its being used for

Weezbo

without looking it up, i would think .into a make up tank...

that is too hefty a temp to let roll onto the floor or into plastic drains... discharge is often limited in temp to any public sewer via drain waste and vent...

Anthony Menafro

Hot water

In N.J., no water over 140degrees F is allowed to enter the sewer system without being first cooled as per our state plumbing code. It needs to be dumped into a holding tank until it's cool enough to be released into the system or cooled with cold water prior to entering the sewer.

Anthony Menafro

Tony Conner_2

Anyone Can...

... go to www.asme.org and see the list of codes, and order any or all of them. Many of them are over $300 (each), and there are a bunch of them. I can't imagine most piping contractors needing to get involved with the actual boilers & pressure vessels codes - they very much tend to be aimed at manufacturers, or shops that weld on them, retube them, etc. If I didn't have any background in this kind of installation, I wouldn't want to jump into trying to read & understand the ones that apply at this point in the job. This can be quite a labyrinth of requirements. Depending on what kind of installation this is, and what the rules for your jurisdiction are, there will be at LEAST two pressure piping codes - power piping or building services piping - this could fall under. Owners, or their designers often have some latitude in selecting which of the piping code that they'll follow, but "none of the above" won't likely be one of the choices.

The local inspector should be able to provide info on what ASME code should be applied. My understanding of Section I is that it's aimed at manufacturers of power boilers, not their installation piping. Best to get it clarified, as there are lots of local spins and interpretations on this stuff.

don_52

Steam_Vent

Sir,

As Mr. Conner stated there is a host of standards, further
there are different variations of those standards within
each "authority having jurisdiction".

It is a maze of