1 reply to this topic

[rs20170808@gmail.com]

Hello,

 

I am having a FireWater tank with a gooseneck vent (to atmosphere) and want to check the adequacy of the size of the vent. 

I have determined the following:

 

1. Outbreathing and Inbreathing rates (in terms of SCFH, air) from API 2000

2. Using the maximum flowrate of air I determined the pr. drop for the vent

 

My question is:

 

for the adequacy check I just need to see the pr. drop vs. design pressure of tank? if pr. drop < design pressure my vent size is OK? for velocity criteria I have to below sonic velocity?

 

thanks

[fallah]

Hi,

 

Yes, the maximum pressure built up in the tank during the vent which is equal to the pressure drop through the vent line, should be equal to or less than the tank design pressure; also the velocity in the vent line should be below sonic velocity...