Storage vessels are designed to hold gas at high pressure after it leaves the compressors. Regardless of a CNG station's fueling pattern or dispensing system (slow-fill or fast-fill), gas storage systems can be extremely useful in reducing fill times and ensuring fuel availability at all times.
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Though it is certainly possible to successfully operate a CNG fueling station with a single compressor, in most cases fleets want fueling redundancy, to prevent potential fueling downtime and missed rollouts.
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Within any CNG fueling system, the natural gas compressors are the components that transform ordinary, low-pressure gas into a high-power vehicular fuel.
There are several types of gas compressors, most being classified as Positive Displacement compressors. This category of compressors can be broken down into two main types:
Reciprocating – Includes single-acting and double-acting designs, as well as diaphragm compressors
Rotary – Includes lesser used types such as scroll, screw and liquid ring compressors
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Natural gas enters the CNG equipment from the inlet line (also called a suction line) provided by the local gas utility. The first piece of equipment used in the process of producing CNG is the gas dryer. Pipeline gas often contains moisture and other impurities. Excessive moisture can affect the operation of the CNG compressors and even your vehicles, so it is important to use a dryer to ‘clean’ the gas to provide high quality fuel.
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As discussed in Part 1, gas temperature plays a crucial role in successful CNG fueling. Now we will look at the affects of outdoor temperatures on CNG fills.
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