RE: Flanged connections with dissimilar Materials

From: <Steve>
Date: Wed Jul 03 2002 - 23:58:00 EDT

Hi Mahavir

your dilemma occurs sometimes with pumps. One way it is overcome is to have the equipment supplier provide flanged ends on his equipment and also to supply mating flanges (and gasket if necessary) to your pipe material spec.

Cheers

Steve McKenzie

-----Original Message-----

From: Prasad Mahavir/Piping [mailto:jainmp@eil.co.in] Sent: Thursday, July 04, 2002 3:30 PM
To: PipingDesign@yahoogroups.com
Subject: RE: [PipingDesign] Flanged connections with dissimilar Materials

Hi folks,

I guess that type of flange facing would also play a role. For example if the flange is with RTJ ends and gasket being used is solid octagonal or oval, then I would not like to exercise option 2. Any Comments?

Mahavir

  -----Original Message-----
From: NIRMAL MURARKA [mailto:Nirmal-Murarka@enc.ltindia.com] Sent: Wednesday, July 03, 2002 5:55 PM
To: PipingDesign@yahoogroups.com
Subject: [PipingDesign] Flanged connections with dissimilar Materials

   For a spec break with change in material near a flanged joint (may be    equipment flange and piping flange) what should be the correct approach:

1. Have spec break at flange-pipe joint (with dissimilar welding at the flange-pipe joint) and avoid leakage because of unequal thermal expansion.
2. Have spec break at the gasket (face of flange) and avoid dissimilar material welding.

   May be temperature and type of materials will play a key role. When can we    go with option # 2 safely ?

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