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Choke Valve erosion index

Choke Valve erosion index

Choke Valve erosion index

(OP)
Hi

What is meant by erosion index with relation to Choke Valve?  I am doing evaluation for choke valves for oil and gas chokes. One of the vendors has indicated erosion index values for each choke valve. My question is

1.Is there a maximum limit of erosion index? Is it defined in any standards?
2.Erosion index value of 125 or 30, what dose it indicate actually? Dose it quantify erosion of trim / body etc over a period of time?
3.How erosion index is compared and with what?
4.Other vendors have not indicated these values; shall this parameter be taken into evaluation?

Thanks.
 

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