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# Pipe Volume

Gallons Cubic Ft.

# Leak Test

$\mathrm{CFM Leak}=\frac{{V}_{R}+{V}_{P}}{7.48}×\left|{P}_{2}-{P}_{1}\right|×\frac{60}{T×{P}_{\mathrm{ATM}}}×C$

CFM Leak

1. Identify the complete storage capacity of the system (receivers, pipes, etc) in gallons.
2. If calculating for leaks: Be sure all prodction equipment is "off" and isolated. Isolate all auto. drains and bleeds
If calculating for system flow demand: Be sure all production equipment is "on" and fully operational. All auto. Drains should be "on" and fully functional to allow for the additional demand.
3. Pump the system up to the cut-out/unload of the compressor. Record this pressure.
4. Record the time in minutes (and cut-in press.) required for the system to bleed down to the cut-in/load pressure.
5. Enter the recorded data into the proper cells in the formula above.
6. Use 1.0 for 10psid or below. At wider than 10psi differentials between load and unload some allowance for rate of flow change as the pressure falls must be considered. For example: if the differential is 50psid then entering a "Correction" value of 1.25 will be relatively accurate. For 20psid a 1.12 correction factor will apply.

# Pump Up Test

$\mathrm{Compressor Volume}=\left({V}_{R}+{V}_{P}\right)×0.13368×\frac{{P}_{\mathrm{max}}/{P}_{\mathrm{ATM}}}{T}$

Compressor Volume

Volume of piping must include additions and corrections for elbows, tees, dryer vessel volumes etc. Test is to be performed from zero pressure in receiver to maximum system pressure. All drains, service valves, leak ect. must be closed or corrected prior to test. A minimum of three tests should be performed with the average of all tests used as test result.

# Savings Per Year

Modulation vs VSD
$\mathrm{Abs. CFM}=\mathrm{Std. CFM}×\frac{{P}_{s}-\left(R{H}_{s}×P{V}_{s}\right)}{{P}_{b}-\left(R{H}_{a}×P{V}_{a}\right)}×\frac{{T}_{a}}{{T}_{s}}×\frac{{P}_{b}}{{P}_{a}}$