Answer / ganesh

1.DIFFERENCE BETWEEN UPSTREAM PRESSURE AND DOWNSTREAM
PRESSURE IS THE DP ACROSS ORIFICE.
2.PERMANENT PRESSURE ACROSS ORIFICE IS NOT FIXED.

Answer / ali

dp(differential pressure) the pressure across dp can not permanent it changes with change in up stream pressure and also pressure change to down stream and velocity also increase at down stream side of orifice plate it is called differential pressure.

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