storage tanks operating/design pressure 1

[142846]

Hi everybody. Looking for thoughts/comments/guides.
base on API 2000 storage tanks are
"... tanks designed for operation at pressures from full vacuum through 103.4 kPa (ga) (15 psig)."
and based on api 14c:
atmospheric service has
"Operation at gauge pressures between 0.5 ounce psi (0.2 kPa) vacuum and 5 psi (35 kPa) pressure."

why definition/criteria for atmospheric tanks for two API standards are totally different?

my next question is about PVRV. API 14c says:
"A second vent may be installed in lieu of the PVRV." In the other hand we can delete PVRV and instead of PVRV use another vent line! are we allowed do this.

I appreciate for any respond.

 

[JStephen]

"Atmospheric" is used differently in every code, so generally don't pay a lot of attention to that. It's like defining "low" pressure, it's a lot different in different fields of endeavor. In a lot of cases, "Atmospheric" is used to mean "zero gauge pressure", not some random range like that.
Second question- can't help, not familiar with API 14C.

 

[LittleInch]

API 2000 is a venting standard, not a tank standard.

API 650 defines atmospheric differently.

Basically use what's in your specific standard.

I don't have a copy of 14C, so it's difficult to see what section that's in or where it applies, but if it says so then it still needs sizing to make sure you don't suck the tank in or blow it up. Also still needs to make sure a bird doesn't lay a nest in it.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[142846]

LittleInch
thank you for your answer. My English is not strong, so I apologize in advance for any possible writing / spelling mistakes.
Api 14c is the best important standard that indicates which safety device is necessary for each equipment such as (pressure vessel, atmospheric vessel, pumps, HX, wellhead flowlines, ...
In the other hand API 14c tell us where and when we should use and apply PSV, shutdown valves, check valves, PSHH (pressure high high sensors), TSHH (temprature high high sensors), fire detectors, ....
In summery API 14c says for prevent or minimize the effect of undesirable events two protection level should be considered .for example for overpressure of pressure vessel 1. shut down valve to close the inflow and 2. PSV for reliving pressure should be considered.
I hope I have given an acceptable response.
thanks a lot.

 

[142846]

JStephen
I hope my brief about API 14C in above be a little familiar you to API 14c.
thank a lot