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...
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...
