How to find out how many CFM your compressor delivers

Here's one of the most used Compressed Air formulas
you should keep on hand...
How to find how many CFM
your air compressor delivers.

Follow these steps to find how many
CFM Your Air Compressor delivers

1. STOP the compressor unit

2. CLOSE the outlet valve on the tank/air receiver

3. DRAIN the condensate from air receiver until there is 0 PSIG -then close the drain valve

4. NOTE THE TIME- minute & second. Then START THE UNIT.
When unit stops/unloads – then NOTE THE TIME again – minute & seconds. Convert minutes into seconds and then total number of seconds it takes between START and STOP/UNLOAD.

 5. NOTE the GUAGE PSIG reading

6. NOTE the Air Receiver/Tank GALLON SIZE

7. USE THIS FORMULA:

TANK GALLONS x .538* x PSIG divided by SECONDS
 
EXAMPLE:
You have an 80 gallon tank, your total seconds timed were 189 and you noted 175 PSIG.

80 multiplied by .536 = 42.88
42.88 multiplied by 175 (example PSIG) = 7504.00
7504.00 divided by 189 (total seconds)= 39.71 CFM delivered

You now know that your air compressor is delivering 39.71 CFM

Your Response to this evaluation should be to compare this number with what your air compressor manufacturer says your CFM should be and evaluate how efficiently your compressor is running.

   

 McGuire Air Compressors, Inc.
"Real People with Real Compressor Experience"

336-229-9999

www.industrialaircompressors.biz

www.hosereels.biz
www.airdryers.biz

How to get the most out of your Air Compressor

Get the most out of your Air Compressor by establishing a regular, well-organized maintenance program and strictly following it.

Such a program is critical to maintaining the performance of a compressed air system and will save you time and money in the long haul. You should use the standard recommended minimum maintenance procedures for air-cooled reciprocating compressors as listed in the checklist below.

One person should be given the responsibility of ensuring that all maintenance is performed properly, on schedule, and is adequately documented.

IMPORTANT:
Before performing any maintenance function:
• Switch main disconnect switch to "off" position to assure no power is entering unit.
• "Lock Out" or "Tag Out" all sources of power.
• Be sure all air pressure in unit is relieved. Failure to do this may result in injury or equipment damage.

DAILY MAINTENANCE OR (every 8 hours)
1. Check oil level of both compressor and engine if so equipped. Add quality lubricating oil as required.
2. Drain moisture from tank by opening tank drain valve located in bottom of tank.
3 Check for any unusual noise or vibration
4. Turnoff compressor at the end of each day's operation. Turn off power supply at wall switch.

WEEKLY MAINTENANCE OR (every 100 hours)
1. Clean dust and foreign matter from cylinder head, motor, fan blade, air lines, intercooler and tank.
2. Remove and clean intake air filters.
3. Check V-belts for tightness. The V-belts must be tight enough to transmit the necessary power to the compressor

MONTHLY MAINTENANCE OR (every 500 hours)
1. Change crankcase oil if using CHAMPLUB hydrocarbon based reciprocating oil.
2. Check entire system for air leakage around fittings, connections, and gaskets, using soap solution.
3. Tighten nuts and cap-screws as required.
4. Check and clean compressor valves, replace worn or damaged assemblies & gaskets
5. Pull ring on all pressure relief valves to assure proper operation.

ANNUAL MAINTENANCE OR (every 4000 hours)
1. When CHAMPLUB synthetic lubricant is used, lubricant change intervals may be extended to every 4,000 hours or annually whichever occurs first (change more frequently in harsher conditions).
2. Maintain lubricant level between high- and low-level marks on bayonet gauge. (Discoloration or a higher lubricant level reading may indicate the presence of condensed water). If lubricant is contaminated, drain and replace.

Click Here to Download a Free Reciprocating Maintenance Service Record Checklist Sheet

For your next order of Compressor Lubricants and Filters –
call 336-229-9999…
Or click here for SERVICE KITS and Lubricants

McGuire Air Compressors
336-229-9999
Email: compressors@mcguire.biz

http://www.industrialaircompressors.biz/

https://www.airdryers.biz/

https://www.hosereels.biz/

Top 7 Air Compressor Related Formulas

Anyone who works with or helps maintain an industrial air compressor should have these valuable compressor related formulas. Print them out and keep them handy…you might need one of them next week!

1. Formula To Find: Belt Length
Compressor Flywheel OD + Motor Pulley OD X 1.57 + 2 X Shaft’s Center To Center Distance In Inches

2. Formula To Find: Motor Pulley OD
Compressor Flywheel OD X Compressor Rpm’s / Motor Rpm’s

3. Formula To Find: Tank OD
Measure Circumference / 3.1416

4. Formula To Find: Volume Of Tank In Gallons
Tank OD X OD X .785 X Tank Length In Inches / 231

5. Formula To Find: PSIA Pressure
14.7 + Gauge Pressure

6. Formula To Find: Compressor CFM Using The Time Method
Tank Gallons X .536 X PSIG Increase / Total Seconds

7. Formula To Find: Motor Max AMP Draw Before Damage Begins
Motor Data Plate AMPS X Data Plate Service Factor


FORMULA SYMBOLS & DEFINITIONS:
/ = divide
X = multiply
+ = add

AMPS = Abbreviation of the plural for Ampere, a unit of electrical current

CFM or cfm = Abbreviation of Cubic feet per minute - a unit of measurement of the flow of a air/gas or liquid that indicates how much volume in cubic feet pass by a stationary point in one minute.

OD = Abbreviation for Outside diameter is a dimension commonly used to specify the size of tubing or pipe.

PSIA or psia = Abbreviation for Pounds per square inch absolute (including atmospheric pressure)

PSIG or psig = Abbreviation for Pounds per Square Inch Gauge

RPM or rpm = Abbreviation for Revolutions per minute is a unit of frequency of rotation: the number of full rotations completed in one minute around a fixed axis. It is used as a measure of rotational speed of a mechanical component.

McGuire Air Compressors
“Real People with Real Air Compressor Experience”
336-229-9999
Email: compressors@mcguire.biz
or Champion Air Compressors...
https://industrialaircompressors.biz/

For Reelcraft Hose Reels
for Air, Water, Oil & fluid plus Electric Cord Reels & Welding Cable Reels...
https://hosereels.biz/

For Deltech Refrigerated Air Dryers
to remove moisture from your compressed air system...
https://airdryers.biz/