Air Compressors

Durham Geo Slope Indicator can supply air compressors for all types of environmental applications. From 3/4 HP oil-less designs for groundwater sampling up to 15 HP models for remediation projects. Selecting the optimum air compressor system will ensure efficient operation and reduce the need for maintenance and repairs. A correctly sized, good-quality air compressor will provide years of trouble-free operation.

Two factors need to be considered when selecting the optimum size and type of compressor, air volume and pressure. The air volume required is usually expressed as CFM (cubic feet per minute). This is the actual volume of air delivered by the compressor as measured when discharged to the atmosphere at a set pressure. Once the CFM requirements have been determined the compressor can be selected. It is important to allow for a 50% duty cycle for the compressor to prevent the system from cycling continuously. (See Tech Tip Below)

A compressor will turn approximately 7 cubic feet of ambient air into 1 cubic foot of compressed air. The net result is seven times as much moisture and contamination inside the compressor receiver and airlines. The compression process will also increase the ambient temperature of the air inside the receiver. Air compressors can generate over 20 gallons of water in an 8-hour operating period. If not removed, the moisture and contaminants can cause premature failure of the airlines and pumping equipment. Compressors should therefore include the following accessories: an aftercooler, a receiver auto-drain, and, depending on the climatic conditions where the compressor will be used, an air dryer.

An after-cooler will reduce the temperature of the compressed air. This will result in the water vapor condensing into droplets which will collect in the bottom of the receiver. An auto drain fitted to the receiver will open automatically, allowing the water to drain.

Air dryers should be used when the compressor is operated in freezing or high-humidity conditions.

Please refer to the ordering information tab below before making your selection.