Plant Services - August 2008 - (Page 36) EfficiEncy Compressors out of the receiver. If more air flows out than in, the air expands into the piping distribution system and the internal pressure decreases. Conversely, if the air flow into the receiver exceeds the outflow, the delivered air increases the pressure in the piping distribution Pressure changes in the storage vesLube AD.qxp 4/29/2008 of air into and system. Monitoring the outlet pressure sel are based on the flow 4:19 PM Page 1 Vs = ΔP x Vf/Pa where Vs = the stored volume ΔP = change in pressure Pa = atmospheric pressure Vf = the vessel’s fixed volume are precisely tuned to your needs and your type of compressor. Specialized 100% synthetic lubricants for Rotary Screw, Reciprocating, Centrifugal, Vacuum Pump and Turbine. Summit synthetic lubricants are manufactured from the highest quality PAO, Ester and PAG synthetic basestocks. These superior base fluids, coupled with Summit’s unique additive technology, assures our customer that they are getting the best lubricants for their compressors. Summit synthetic lubricants provide an effective alternative to OEM lubricants. Summit synthetics are engineered for specific applications. Higher Performance features: • Selection of viscosity grades • Low pour point • High viscosity index • Excellent water demulsibility • Enhanced oxidative stability • Extremely high and low range of operating temperature • Eliminates sludge and varnish • Extended service life • Higher product purity • High flash point • NSF H1 and Kosher approved lubricants for most applications Call Summit today for a distributor near you. Compressor Lubricants Summit Industrial Products and controlling the release of the air from storage by means of an intermediate pressure/flow control produces a stable reference point for balancing the system. The results: • A reliable, stable compressed air source for production purposes. • Fewer compressed air-related problems and work stoppages. • Energy savings from optimizing system efficiency. An unanticipated compressor shutdown usually dictates the minimum amount of storage. To prevent serious production interruptions while the standby compressor starts, comes on line and begins to contribute air, storage must sustain the system. The required amount of storage, therefore, depends on the compressor capacity and how much pressure degradation can be tolerated before production begins to shut down. If, for example, the standby compressor takes 30 seconds to begin filling in for a failed 100 hp compressor rated at 500 scfm, and atmospheric pressure is 14.5 psia, the storage requirement is 250 cf (500 scfm x 1 min./60 sec. x 30 sec.). If the storage pressure is allowed to degrade 15 psi during those 30 seconds, the receiver capacity would be: Vf = (Vs x Pa /ΔP) x 7.481 gal/cf Where Vf = Receiver volume Vs = 250 cf Pa = 14.5 psia ΔP = 15 psi In other words, a fixed volume of 1,870 gal (250 x 14.5/15 x 7.481) will release 250 scf while dropping 15 psi in pressure. If the storage pressure is allowed to degrade only 5 psi during the 30 seconds, the receiver capacity would be 5,500 gal (250 x 14.5/5 x 7.481). These examples clearly demonstrate the relevance of the allowable pressure change. Demand surges that cause flow spikes also influence the storage requirement. Evaluate them to determine if additional storage is needed either in the comAugust 2008 1.800.749.5823 P.O. Box 131359 • Tyler, TX 75713 www.klsummit.com ISO 9001:2000 Registered 36 www.PLANTSERVICES.com http://www.klsummit.com http://www.klsummit.com http://www.PLANTSERVICES.com
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