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Process Data Sheet For Flow Element.


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#1 shantanu.ghag

shantanu.ghag

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Posted 13 January 2019 - 04:07 AM

Dear all, 

 

Few query related PDS of flow elements, 

 

1. Can anyone suggest allowable DP criteria for flow element-orifice?

    As a general criteria, i think it is below 0.2 bar, but in some data sheet i have seen its varying w.r.t.                      min/normal/max flow also.

2. Also, how min/max flow in data sheet is decided over normal flow rate? is it specific % of normal flow rate?

3. How can we decide maximum meter range?

 

Thanks, 

Shantanu.



#2 Technical Bard

Technical Bard

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Posted 13 January 2019 - 11:15 AM

An orifice plate will generally be specified for 100, 200 or 400 inH2O pressure drop measured by the taps, but some of that is recovered.  Then you need to consider the pressure drop of the meter run (if you are installing a proper meter run of straight pipe).  A typical allowable pressure drop across an orifice meter would be 1-2 psi.  Other meter types are generally more (except ultrasonics).






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