7 replies to this topic

[sukanta87]

Hi All,

 

What are the standards for sizing of restriction orifices? Needed for liquid and gas-liquid flow.

 

Thanks in advance.

[fallah]

Hi,

 

As far as i know, there is no reputable code/standard directly addresses the RO sizing but there are associated references such as below can be used in this regard:

 

ISO 5167 Parts 1/2: Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full

[sukanta87]

Dear Fallah,

 

Thank you very much. I can try the reference.

 

Thanks

[Shivshankar]

Sukanta,

 

In addition look for,

 

AGA Report No.3, API MPMS 14.3.2

Edited by Shivshankar, 24 December 2013 - 02:20 PM.

[sukanta87]

Dear Shivshankar,

 

Actually what I am getting from the well known literature is for Natural gas services. For liquid and two phase flow services they are still untouched to me. The consideration relies mainly on the upstream pressure and downstream pressure of the RO.

 

Thanks

[Shivshankar]

Sukanta,

 

See below link

 

http://www.piping-en...instrument.html

[peclpassic]

Dear Sir

 

You may check American Petroleum Institute (API) -RP 550/551 Installation of Refinery Instruments and Control Systems

 

Or International Organization for Standardization (ISO)-
5024 Petroleum Liquids and Gases - Measurement - Standard Reference Conditions
5167 Measurement of Fluid by means of Pressure Differential Devices
5168 Measurement of Fluid - Estimation of Uncertainty of a Flow-rate Measurement

 

Thank you.

[sukanta87]

Thanks all.

I think there are some specific techniques to size restriction orifice plate which is not similar with orifice meter plate. The calculation can be done but the thing is the CONSIDERATIONS. For example, the upstream pressure and downstream pressure of a RO is 1000 psig and 80 psig accordingly. Is it possible doing this DP using single RO? When to use multiple RO? How to measure cavitation after RO? IF RO is after control valve, then what should be the upstream pressure of RO? what is the allowable/suitable range of beta ratio for RO? etc ,,,,
Is there any standards or guidelines which is specific for RO (for liquid services), not in-general orifice plate? I went through AGA, ISO 5167-2 and some others.