RE: Re: Valve Bonnet Design Code

From: <Samuel>
Date: Thu Jun 12 2003 - 18:17:00 EDT

Hi, hank146:

As I said, this bonnet is just like a blind flange except a stem hole at the centre. It is a flat cover, so that the ANNEX F of B16.34 could not be used here. It is bolted to valve body with forged material. I have checked all standards you mentioned, and no result. The centre hole for valve stem and the stem seal force as well as the stem itself will make the blind flange calculation too conservative.

Any more comments?

Best Regards,

Samuel

-----Original Message-----
From: hankl46 [mailto:hleveret@aol.com] Sent: Thursday, June 12, 2003 1:12 PM
To: <a href="/group/PipingDesign/post?postID=-sCN2RPFFyaXRcZdVxiRfctNpQVBDP4wSq-K4wKwat0VsrGYRxGKxMksGhKyxGSxJ1UQhH_-iMx7YonCxZ4U3nF_4Q">PipingDesign@yahoogroups.com</a> Subject: [PipingDesign] Re: Valve Bonnet Design Code

It depends on the application.
Example, for boiler safety valves, the ASME Sect.1 sub PG's must be followed for valve certifications.

Valve bonnet is a pressure retaining component with mechanical seals. If the manufacturer is using standard flange, then the ANSI B16.5 design standard is applicable for that portion of the bonnet. Some bonnets are welded, or bolted, and some are forged. Which one are you looking for?

Here are some standards and codes covering valve design. For Pressure/Temp ratings see ASME/ANSI B16.34 (this may be the one you are looking for when you mentioned strength design) for bonnet Threads, see ASME/ANSI B1.20.1 for Forged fitting see ASME/ANSI B16.11
Other standards/Codes includes:
MSS-SP84
API 602, 598, 606
AWWA,
There are many more, including UL for valves used in semiconductor industries.

• In PipingDesign@yahoogroups.com, Samuel Liu <samuel.liu@a...> wrote:
  >
  > Does any know which code should apply to the strength design of
  valve bonnet
  > that is similar to a blind flange but having a centre stem hole?
  >
  >
  > Best Regards,
  >
  >
  > Samuel
  >
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[Non-text portions of this message have been removed] Received on Thu Jun 12 18:17:00 2003