Vessel design SG of 1.5,

[mrtangent]

All, we have a storage tank containing fluid of an SG of 0.7. We are installing a larger tank onto site. I'm told it works if we reduce the design margin on the codes from 1.5 to 1.2.

I'd like some candit coments from engineers on your perspetive of this change. We dont process any fluids on site with an SG of more than 1. All are 0.7.

 

[MiketheEngineer]

Cutting it a bit thin for me... It's your site...

 

[1gibson]

"it works if we reduce the design margin on the codes"

I think that statement is going to scare everyone away from replying.

 

[StoneCold]

Obviously the only limit on the design margin is money. So what design margin are you talking about exactly? You want to reduce the design pressure? Hydro pressure? What exactly are we talking about? How big is the tank? What is it made of? What is in it? Is it an ASME tank or an API tank?

Thanks
StoneCold

 

[BigInch]

Scared the craX out of me he sure did.


We are more connected to everyone in the world than we've ever been before, except to the person sitting next to us. Lisa Gansky

 

[jamesbanda]

meaning using an SG factor of 1.1 rather than 1.5.. the vessel and civil codes usually use 1.5 for fluid sg.. but in reality the tank is storing 0.7.. so even 1.1 to 0.7 should have a big margin..

 

[BigInch]

And when they hydrotest again... oh right, they'll never do that would they.

The tank is designed for 1.5 because its a 50% safety factor over the hydrotest load!!!

We are more connected to everyone in the world than we've ever been before, except to the person sitting next to us. Lisa Gansky