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Dear All, Can anyone inform if galvanic corrosion could take place when coupling CS RTJ Flanges with super austenitic SS (904 L) ring joints in sea water environment ? Regards

Dear All, I know that SS are better than HDG Steels. But when we HDG steels can be used instead of SS, and when this substitution is no acceptable. Is there any standard or common practice specially in oil and gas industry. Thanks.

Hi all; Does anyone know a good reference explaining lip seal design for ball valves ? Thanks

Dear all, can any one reply to the follwing question : (1) is F316/HF an acceptable alternative for F6 trim ? (2) Which is the most important cretiria for the trim selection: strength, hardness or corrosion resistance ? Thanks;

Dear All, Can anyone advise what are the main differences between serie A & B large size ANSI flanges. As a general rules we shall specify serie A or B ? Regards,

Thanks gerhardl, So "solid ball" does not mean that the ball is fabricated from soldi materials such as Tungsten carbides or St n°6. Regards,

Dears, Could any one explain the meaning of "Solid ball valve" ? and if the ball valve is not constructed with solid ball what are the acceptable alternatives. Regrads, ENPMAT

Many thanks to all for information

Hi evry one, Our Client is requesting to install an injection quil (3/4") on a 10" production line in service. Is there any procedure to perform such work without stopping the production (like hot tapping for exemple. Regards;