What are the Detail standards of Venting and Draining of systems? 1

[JonnyWill]

What are the standard details for venting and draining in systems? I’ve been searching through ASME for a standard but to no prevail. Obviously certain rating have different specifications. This particular line I'm working on is a 1½” gas line with many branch connections. On the drain section they have a gate valve and cap, but the vents only have a screwed cap! I’ve read somewhere that you can’t have a screwed section in a pressured line, if this is so, shouldn’t I be installing a gate valve on the vents also? Again is there a standard detail specification for Vents and Drains ?
Thanks in advance.
Jonny

 

[JohnBreen]

Hello,

National consensus Codes and Standard are not intended to be design "cook-books" or text books for design. Codes and Standards are MINIMUM requirements to be included in the design for the purpose of SAFETY.

Company (Corporate) design standards often reflect the design philosophy of the Corporate Engineering Department and they result from the "lessons learned" over many years of experience. These company design standards usually show "standard details" that are the "accepted" (by the chief engineer) way of designing a system.

The ASME/ANSI B31.2 Code for Fuel Gas Piping has been withdrawn (although if you can find a copy, it is useful as a reference) and was replaced by NFPA/ANSI Z223.1. You may want to look at this site:

http://www.nfpa.org/Codes/NFPA_Codes_and_Standards/List_of_NFPA_documents/NFPA_54.asp

Some manufactures of proprietary drain syatems have design manuals (e.g., SARCO has its "Design of Steam Trap Hook-ups" manual) and perhaps you can find such a manual by searching the internet. My advice - get some input from an experienced piping engineer.

Best regards, John.

 

[JohnBreen]

Hello,

Also try these sites:

http://www.pipingdesign.com/

Piping Handbook
Mohinder L. Nayyar

http://search.barnesandnoble.com/bo...38&ISBN=0070471061&bfdate=10-10-2002+08:34:15

http://www.aga.org

http://www.aga.org/Template.cfm?Section=Advocacy&Template=/Search/SearchDisplay.cfm

http://216.239.33.100/search?q=cache:MoB8CTdIUXkC:

http://www.aga.org/Content/Navigati...+site:www.aga.org++gas++z223.1&hl=en&ie=UTF-8

Regards, John.

 

[babyyoda]

What type of gas? What is your pressure of the pipe line?

There are several codes which deal with pressurized piping. Some codes are specific to gases - venting Hydrogen, or codes on natural gas. There are also codes which are specific to the area of the world you are designing in, or to the destination of the equipment.

While I have not read that you can't use threaded fittings
in a pipeline, it may not hold the desired pressure.

Babyyoda

 

[JonnyWill]

Thanks for your help. I've bought the Piping Handbook by Mohinder L. Nayyar. Great book.
Cheers