Tank Spec for DBBL Valves
Tank Spec for DBBL Valves
(OP)
This question has been asked before but the answer wasn't exactly what I was looking for.
What specs (Api etc..) dictate the operation of double block and bleed valves in a mutli product tank storage/ manifold?
The previous answer was API 6D but I beleive that is the valve spec. I would like to know the tank storage spec if there is one.
Thanks
What specs (Api etc..) dictate the operation of double block and bleed valves in a mutli product tank storage/ manifold?
The previous answer was API 6D but I beleive that is the valve spec. I would like to know the tank storage spec if there is one.
Thanks





RE: Tank Spec for DBBL Valves
I have seen many specifications requesting the use of these valves, as prove of positive isolation of two incompatible systems (between tanks, between the pressurised equipment and associated instruments-pressure, temperature, etc, including the bleed on the ambient side). I have seen large DB&B valve between the potable water line and the fire water system;- however, I only have seen some local authority regulations for the use of such valves to protect the potable water system from contamination due to return of fire water into the potable water system. The applications are many and mostly client spec driven.
Hope this helps,
cheers,
gr2vessels
RE: Tank Spec for DBBL Valves
RE: Tank Spec for DBBL Valves