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josej
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Join Date: Mar 2008
Location: Mumbai
Posts: 250
Good Answers: 2

NDE Testing Requirements

07/27/2012 6:19 AM

Dear All,

Therse is a Clause in ASME B 16.34, All Special Class Valve shall be subjected to Non destructive exam , what Kind of Valves are Called Special Class Valves

I have application of 6.0" /600 # RF , Flanged ( 3 piece , forged Full Bore Ball type Shut down Valve ) , should i consider NDE , ( Non Destructive testing on Valve Body ) .

Regards

Jose
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#1

Re: NDE Testing Requirements

07/30/2012 4:38 AM

What role does the valve play, in what sort of process?

  • Nuclear?
  • Steam?
  • Bulk pharmaceutical?
  • Sewage?
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user-deleted-1100
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Join Date: Aug 2007
Posts: 97
Good Answers: 3
#2

Re: NDE Testing Requirements

07/30/2012 5:51 AM

All valves Class 600 are special class valves. NDE (Non-Destructive Examination) which could be X-Ray, Gamma Ray, Ultasonic Examination, Dye-Penetrant and Hydrostatic Testing, you may apply to examin the body of valve. Hydrostatic Testing is applied for testing Valve Seat, but it is applied on large diap valve.
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cingold
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Join Date: Nov 2007
Posts: 519
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#5
In reply to #2

Re: NDE Testing Requirements

07/30/2012 8:41 AM

"All valves Class 600 are special class valves."

According to ASME B16.34?
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PennPiper
Guru
Engineering Fields - Piping Design Engineering - Retired Piper

Join Date: Feb 2007
Location: Bayonet Point, Florida
Posts: 635
Good Answers: 61
#3

Re: NDE Testing Requirements

07/30/2012 6:59 AM

This NDE is normally by the Manufacturer not the installer or the user.

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cingold
Guru

Join Date: Nov 2007
Posts: 519
Good Answers: 11
#4

Re: NDE Testing Requirements

07/30/2012 8:40 AM

Read section 2.1.3 Special Class Valves.
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