API 650 - Max internal pressure above liqu

[carthago]

I need some help, I am a bit lost , please....I shall explain:

I always though that for API 650 the maximum internal pressure is 2.5 inches water column or 25 psi!!
( by the way is it GAGE or ABSOLUTE ??).

1/-Is this limit of 2.5" water column correct ?

If pressure is a higher then above One has to use appendix F.
And also watch out the vertical component due to this pressure ? Pressure * Tank section area.

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2/-I have seen lately an API 650 tank data sheet with
design pressure = 1013 mbarg ( gage (
This is equal to 210 psig

Is this normal or is there a mistake in my interpretation
This > the 2.5"water column or not !!

Thanks

 

[pleckner]

API 650 internal design pressure limit is 2.5 PSIG. The external design pressure limit is 1" WC.

1 bar = 14.5038 psi

You need to re-evaluate your conversion and decimal point location. Perhaps you mean 1.013 mbarg and not 1013 mbarg? 1.013 mbarg would give you about 0.41" WC.

 

[carthago]

Pleckner,
You are right...thanks a lot

 

[MJCronin]

cartago...

Where will this pressureized equipment, that you have been working on be installed ?

I live in Western Pennsylvania..... will it be near me ?

MJC