Ings, your problem surely is selection of manual bypass valve or a poor design for the function, pipe sizes look reasonable: 6"-4"-3" & 6"-4". Function of bypass could be for startup only, not for throtling in lieu of control valve. Vibration is due to unstable flow inside the valve, if not any...
Easy for casings, use the same as the pipe, work done before by piping engg. Not so easy for the trim, should check media, p, t, etc. Groups: 13-Cr, 3XX-SS, Stellites, Monel, Duplex, and so on.
See API-600 for common trims.
Sounds very familiar to me with one operator now, same service, three different specs, from different FEEDs.
Very hard to supply 30"-150 swing checks per API-600 design, heavy wall thickness, in 60 days!
In other asks for wafer duo check 30"-150-Series A, easier to 60 days. Series B is the...
