Linsheng – What Kind Of Car Air Compressor Do You Need?
linsheng said that before using the car air compressor, you should choose the right car air compressor you need. How to choose? We specialize in analyzing the quality characteristics of the compressor cfm capacity, motor function and compressor type:
Determine compressor cfm
What cfm capacity do you need? The following is a general formula for selecting the cfm rating for a new compressor. Add cfm requirements (pneumatic wrenches, grinders, drills, spray guns, etc.) for all pneumatic tools you plan to run. This total cfm should represent the total of all pneumatic tools that you actually plan to run simultaneously.
Once you have this tool cfm total, add 10% of the margin to compensate for potential leaks (leakage at the joint, etc.). Then add another 15% as a safety margin (for piston compressors).
This compensates for the tool cfm rating and the compressor’s published rating (any of which may not be accurate in the real world).
As another example, if the total tool cfm used in your store may be 20 cfm, then you will increase by 10% (2 cfm), then increase by 15% (about 3 cfm), and the total compressor capacity is 25 CFM.
Although you can reduce expenses by running one or two tools at a time, you do need to determine the actual level required during the maximum workload at any given time.
Total cfm requirement = ________ cfm
(Add cfm requirements for all tools that may be used at the same time)
Cfm x 1.10 = ________
(10% increase to make up for potential leaks)
New cfm x 1.15%= ________
(15% increase to provide safety margin and longer pump operating life)
Maximum psi required = __________
Summary: Tools total cfm + 10% + 15% = compressor cfm required. If you plan to run a rotary compressor, you do not need to add an additional 15%.
Horsepower and motor function
In general, most true 5 hp compressors can deliver up to about 18 cfm, making them ideal for small workshops. A 7.5 hp compressor should provide approximately 27 cubic feet per minute at a pressure of 100 psi.
Although this series of compressors can usually be operated on single-phase circuits, power ratings outside this range may require three-phase wiring to be built in your shop.
If considering a piston compressor, look for quality characteristics:
• Cast iron crankcase and cylinder.
• Aluminum connecting rod.
•Tapered Roller Bearings.
• Stainless steel reed valve.
• Fan flywheel (for better cooling and less moisture accumulation).
• The oil sight glass monitors the oil level.
• Pressurized refueling system.
• Low oil cut-off switch.
Single or double (reciprocating)
If you plan to install a piston (reciprocating) compressor, consider using a two-stage unit for shop floor use. The two-stage compressor begins to compress the air in the low pressure cylinder. The air then passes through the cooling coil to the second high pressure cylinder. In other words, the air is compressed in two progressive stages. The result is higher pressure and motor life compared to single stage compressors. Two-stage compressors are typically used for pressure ranges of 125 psi or higher. The two-stage compressor will use an intercooler system (usually a coil) to reduce moisture build-up between the two cylinders.