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...
