Re: Instrument Connection

From: <aluser2>
Date: Sun Dec 31 2006 - 14:43:00 EST

no, completely different A335-P91 is almost always custom selected for this or a specialised sort of service.
(unless somebody screwed up,,, which happens)
It should not be substituted willy nilly. 304 is not an equivalent. You will also have some difficulty finding a welder who can weld this material adequately.
(prone to "grapes" ion the welding").

• Original Message ----- From: Smithin Patil To: Piping Sent: Wednesday, December 27, 2006 11:07 PM Subject: [PipingDesign] Instrument Connection

   Dear All,

   Project: Naptha Cracker.
   Service: Very High Pressure Steam
   Design Pressure: 135 kg/cm2
   Design Temp: 540 deg.C

   9Cr material (ASTM A335-P91) is the most suitable material for this design conditions & service. But 9Cr material is not easily available in the material & if available it will be with long delivery.

   For Instrument connection

   Please let me know the following,

   Instead of 9Cr material can we use SS304.    If SS304 is acceptable then there may be thickness difference between 9Cr pipe & SS304 pipe. 1:3 taper is the acceptable ratio but if this ratio does meet the requirement then what is the solution.

   Is welding possible between 9Cr & SS304, if possible then how. Which welding process, method & welding rod.

   Thank you in advance for the suggestion.

   Best Regards

   Smithin Patil
   TEC Japan.

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[Non-text portions of this message have been removed] Received on Sun Dec 31 14:43:00 2006