Steam Reduction
Steam Reduction
(OP)
What is the maximum pressure differential that could be used for acurate control through a steam control valve. The pipe diameter on the inlet is 2 inch?
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RE: Steam Reduction
Generally, for sizing, you don't like to go much under 20% or over 70% open on the control valve. In operation, I tend to push that to 10% to 80% or 85%.
RE: Steam Reduction
E.g. the total system pressure drop @ design point is 45psid (exclusive of the control valve), so the max pressure drop in the valve can be estimated as:
total dp = valve dp + 45psid
total dp = 0.25 total dp + 45psid
total dp = 45psid/(1 - 0.25)
total dp = 60 psid
valve dp = 0.25 total dp
valve dp = 15 psid
This is a very simplistic approach that applies to most liquids (liquids like : water, gas-oil, oil) where you can achieve turbulent flow (Re > 2000).
If you have compressible and/or multi-phase fluids the situation may be different as other considerations may apply (critical vs. sub-critical flow).
Slurries are a different story too...
Hope this helps.
a.