Dear all!
Appreciate if some one could give an advice on this: normally, Isolation Flange (IF) will be installed at the first flange of pipeline connected to metering skid. If i install IF after a emergency shutdown valve just incase of mainternance for IF, i need not to discharge all natural gas in the whole pipeline. Is it any bad impact to the CP system of the pipeline if i install the IF as above or against code/standard. Is there any code/standard, or reference guideline on this? I've read DNV-RP-B401, NACE-RP-0286-2002, and NACE-RP-0169-2002, but not as particular case as this.
Thank you very much for your valuable input.
Howard
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