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The sub-sea pipeline land on the earth , then into the station of storage oil . Between the land point of pipeline and the station will use external current of cathodic protection . To avoid the current into the station . What isolating device is the best choice near sea ? In terms of Safety...

To gerhardl : The old system has used over 30 years .As you say , the old design had not existed. And API 6D appears not to include with counterweight of swing check valve. I will communicate with operation unit about the standard applicability of the...

Thanks for your reply . The check valve avoid the oil return when the oil vessel pump the oil to the onshore station . The operation unit tell me the swing check valve(include counterweight) which is used over 30 years . And the counterweight can be used for confirming the opening angle and...

I will purchase the 42" 150# swing check valve which based on API 6D standard . And the valve need additional outside lever & counterweight . The question is if API 6D standard allow the outside lever and counterweight on it ??? or another standard or specification can allow it ? Thanks for...

If manufacture the 42" 150lb swing check valve which (6D/594) standard is applicable ? 42" swing check valve Face to Face End to End dimensions is not defined directly in table . Design : API 6D / 594 ? Face to Face : By agreement Wall thickness : ASME 16.34 Flange End : ASME B16.47 Series B...