API 650 Tanks MAWP is tool low for conventional emergency vents

[richissa]

Hi,

The problem is that the MAWPs on API 650 Storage tanks are too low to be able to utilize conventional conservation/emergency vents.

I am trying to re-rate the tanks to increase the allowable working pressure and lower the operating pressure of the flare/vapor combustor header.

Can anyone please assist.

Thanks!

 

[Duwe6]

You're in the wrong forum -- API 650 tanks go in "Storage Tank Engineering"

And a review of Atmospheric Storage Tank conservation vents and emergency vents from tank appurtanance companys -- Shand & Jurs; Protectoseal to name 2 -- will show that they are available down to 1/2 ounce per square inch. A 3/16" thick steel roof weighs about 0.7 osi.