An air compressor is a device that converts power produced from an electrical, gas or diesel engine to compressed air that is released in quick bursts. Air compressors are used to run pneumatic tools, hobby and craft tools, car repair and industrial and construction applications. There are two main questions to ask in order to determine the type and size of the compressor needed to do the job:
1) Purpose
2) Power source
1. Purpose Determines CFM, PSI and Tank Size:
Knowing how an air compressor will be used is the most important question to answer because of its many uses. A compressor used in the home for hobbies or filling tires, balls, kiddie pools and other things around the house will require a small, portable model while a compressor used in manufacturing facilities is much more powerful and may be stationary.
The main purpose for compressors used in the home is to run pneumatic tools. These tools are more powerful, lighter in weight and will last longer than electric tools. The pneumatic tool’s air flow requirements are measured in cubic feet per minute (CFM). Nail guns and staple guns require less CFM than grinders and sprayers.
To determine the size of the compressor needed, add up the total CFM of all the pneumatic tools to be used at the same time and multiply that number by 20 percent. The compressor should deliver more CFM than what’s required.
While most pneumatic tools operate at 90 PSI (pound per square inch), some operate at a lower level PSI while others such as a sander or polisher operate at higher levels. Determine the highest PSI tool used and choose the compressor accordingly.
Tank size will determine how long the compressor can run without depleting the air. Tank size is commonly listed in gallons. If the compressor is used for only short bursts, a six gallon tank is sufficient. For longer, more concentrated usage, a 7 – 30 gallon tank is appropriate. For tools used for longer periods of time such as sanders, an even larger tank of 30 – 60 gallons is needed.
2. Power Source
Choosing a compressor powered by electricity will limit its portability since an electrical source is necessary. Electric air compressors are best used at home in a garage or workshop. Smaller compressors with less than a 30 gallon tank generally run on a home’s 120 volt, 15 amp source of power. Any compressor larger than 30 gallons needs more power to operate, or a 240 volt, single-phase power source.
A compressor powered by gasoline or diesel fuel can be used anywhere which makes this type of compressor suitable for construction and other outdoor use.
This article discussed the two main questions to ask when considering a compressor: the purpose which will determine the CFM, PSI and tank size and the power source to determine portability. In order to customise the choice of a compressor even more, the noise level, design (determines storage options) and maintenance are factors in choosing the correct compressor for the job.
Company Profile:
Screwfix is the UK’s largest direct and online supplier of trade tools, accessories and hardware products. With over 30 years’ experience in the industry, we despatch tens of thousands of parcels every week for next day and weekend delivery to tradesmen, handymen and serious DIY enthusiasts all over the UK.
To view the full range of air compressors from Screwfix customers can visit our website here – http://www.screwfix.com/c/tools/compressors-air-tools/cat830698.
