DB&B requirements for Fuel Storage

[ferfu49]

I am looking for the standards that address the issue of Double Block and Bleed requirements for multi-products storage tank facilities.
Would this be under API, NFPA? etc...
Could someone point me in the right direction as to which standard needs to be invoqued ?

 

[JCPICARD]

Standard API 6D Plug Valve
For further info see

http://www.Controlseal.nl