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Chemical plant design & operations FAQ
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FAQ
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What is turndown and rangeability?
Posted: 5 Nov 03
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Turndown and rangeability is usually associated with control valves. The definition of these are (from Perry):
maximum controllable flow
Rangeability R=--------------------------------
minimum controllable flow
normal maximum flow
Turndown ratio T=-----------------------------------
minimum controllable flow
Generally valves are designed so that T=0.7*R where R is between 20 and 50.
This definition complies with the ISA standard.
Turndown is often used not only in connection with control valves but also as a more "global" parameter e.g. for whole plants. |
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