Dear Nitin,
Unofurtunately I was on leave and took sometime clearing all my personal emails. However it is disappointing our dear members have become more reluctant and lethargic to have discussions mutually benificial.
Coming to the query, to my knowledge of American standards, this size and rating is not covered for the obvious reason being unusual and are yet to be standardised. The solution in your case is to indicate the design to be in acc. with API 6D and F/F to manuf. std. I also have doubt if any manuf. will make a RB valve in that size. So you may have to consider only FB type. For testing of such valves ensure you mix API598 and API 6D to suit the design and service condition as many suppliers practically are unable to meet API 6D creteria for such large size. This is from my inspection experience.
If alternate valve type can be thought about in your application, definitely you should take that change. The key reasons being the maintenance of seats, back flushing, stem packing overhauling is going to be more complicated than any other on/off valve or even a flow control valve. Last but not the least, cost varies in the region of 25 to 40% more. for valves above 32".
So use of ball valves above 28" should have the right reasons.
Regards,
Kannan.
| "Hanamapure Nitin \(Mumbai - Piping\)" <N.Hanamapure@ticb.com> Sent by: piping_valves@yahoogroups.com 07/11/2008 06:55 |
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Dear all,
I am looking for design standard for 600#, 42” LTCS reduced bore ball valve used in sour service.
Could anyone suggest me the design standard?
Thank you.
Best regards,
Nitin Hanamapure_._,___
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