Jump to content



Featured Articles

Check out the latest featured articles.

File Library

Check out the latest downloads available in the File Library.

New Article

Product Viscosity vs. Shear

Featured File

Vertical Tank Selection

New Blog Entry

Low Flow in Pipes- posted in Ankur's blog

0

Nitrogen Consumption Required For Plant


1 reply to this topic
Share this topic:
| More

#1 yasminbanu07

yasminbanu07

    Brand New Member

  • Members
  • 1 posts

Posted 30 August 2017 - 06:25 AM

hello!!!!

 

Greetings of the day!

 

Need help regarding the estimation of nitrogen required for a chemical plant.

 

We are having 0.3 barg nitrogen for pressurizing and 0.04barg for blanketing. we have solvent storage tank with dished ends which is connected with 0.04barg nitrogen. I have estimated tank inbreathing as per API std 2000-2009 calculation which resulted in 90Nm3/hr of air for 30m3 tank. I converted the same to nitrogen flowrate using grahamm's law and applied ideal gas equation to get N2 flow rate at 0.04barg. please clarify whether my calculation is correct or not.

 

We are using nitrogen which is generated from liquid nitrogen using vaporiser and 50NB line with nitrogen at 6barg is connected to the plant. I want to size a PRV which can reduce 6 barg pressure to 0.04barg. for this how to consider flowrate of nitrogen to size PRV.

 

 

Thanks i advance.

 

Regards,

YB



#2 VeryProfessionalEngineer

VeryProfessionalEngineer

    Junior Member

  • Members
  • 18 posts

Posted 30 August 2017 - 07:57 AM

I can't comment on your calculation because I haven't performed that before myself, but the consumption seems a bit high at first glance based on what I see in my current operation. If this is a solvent, I would think the usage would be tied to how quickly you can use the chemical. Here's a vendor white paper on calculating breathing rate: Link, you might want to cross-check your calculation with that. 

 

With regard to the PRV, the arrangement will depend on your situation, but based on your context I'm guessing you're talking about a regulator and not a safety valve. I'm used to seeing one regulator on the inlet to the tank with one setpoint, then another regulator with a higher setpoint that sends fluid relieved from the tank to flare or other safe location. In addition, you may have a PSV on the tank itself that it sized for relief under whatever is the worst case of all applicable scenarios (fire case, failed regulator, blocked exit, etc...).  






Similar Topics