darthsoilsguy2
Geotechnical
- Jul 17, 2008
- 579
There is a overflow/overfill line inside a API 650 tank built in 2004 that i'm looking at.
It's intake is about 2' below the roof the fixed roof. The 8" pipe comes down the inside, elbows towards the wall, penetrates the shell, and elbows down outside the tank. The tank roof has a 4" pipe vent with pressure/vacuum conservation vent attached.
Here's my question:
Do overflow pipes come with some sort of check valve that prevents the pipe from venting air in or out, but will allow product to discharge? Or is it likely that the conservation vent is doing nothing?
It's intake is about 2' below the roof the fixed roof. The 8" pipe comes down the inside, elbows towards the wall, penetrates the shell, and elbows down outside the tank. The tank roof has a 4" pipe vent with pressure/vacuum conservation vent attached.
Here's my question:
Do overflow pipes come with some sort of check valve that prevents the pipe from venting air in or out, but will allow product to discharge? Or is it likely that the conservation vent is doing nothing?