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Bird Screen Mesh Size And Pressure Loss Estimation

bird screen

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#1 chem2013

chem2013

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Posted 08 September 2016 - 11:41 AM

Dear All,

 

We have blanketing tank with PVSV venting to safe location in atm.

We have provided bird screen at outlet of vent pipe.

 

We need to provide back pressure at outlet of PVSV so that vendor could select right size.

We are proposing 10% of PVSV set pressure for back pressure data due to not having bird screen size info and pressure loss across this.

 

Typically PVSV set pressure is 0.1 barg. So, total back pressure would be 0.01 barg.

 

Please let me know

(1)if the present approach is okay in absence of firm data.

(2)How to set bird screen size and determine pressure loss. Are there references available ?

 

Thanks.

Regards,

 

 

 

 



#2 Saml

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Posted 08 September 2016 - 10:19 PM

Searching Google: 

 

"Bird Netting": 25 mm square will keep most birds out

"Mesh Pressure Drop Perry": has references to Perry's chapter 6 and a paper with a validation for CFD

 

I would check that this pressure drop is not significant and that this method predicts a number that is low enough so this issue is not a concern. If it is a close number, sometimes is better to increase to the next diameter of pipe rather than trust the precision of these equations.



#3 proinwv

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Posted 12 September 2016 - 01:57 PM

Include in your numbers losses in pipe and fittings.

 

You can increase the area of the screen by making it a cylinder rather than a flat disc.

 

Increased pipe exit is also good. Remember there are also losses in adding an expansion.

 

Will your installation be in a climate where icing is possible? This can lead to a bad accident without proper protection for the vessel.






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