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Clocking a Compressor
for Gas Flow.
To clock a gas
compressor you will need to identify the following -
- That the only load on the gas meter
is the compressor you are clocking.
- What the gas pressure is at the
meter while you are clocking.
- What the smallest rotary dial on the
meter measures in one revolution.
Next, record how long it takes for a
given amount of gas to go through the meter and what pressure the
meter was at when you clocked it.
Now the fun part; use the following
formulas:
Correction Factor = 14.7 + P (pressure at meter in psi) / 14.7
Uncorrected Flow = Cubic feet clocked X 60 seconds / clocking
time (seconds)
Corrected Flow (scfm) = Flow X Correction Factor
Example: You have determined that you
need to know what the gas flow at your NGV station is. Pressure at the
meter while running is 18 psig. It takes 25 seconds for the 10 cubic
foot dial on the meter to rotate once. What is the corrected flow?
Correction Factor = 14.7 + 18 psig / 14.7 = 2.224
Uncorrected Flow = 10 scf X 60 / 25 sec = 24 scfm
Corrected Flow = 24 scfm X 2.224 = 53 scfm
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