Improving pump reliability over the past ten years, pump users have made progress toward improving pump reliability much of it came from total quality (tq) initiatives where tools such as root-cause failure analysis, statistical analysis techniques, and a heightened awareness were used. A pump fmea approach to improve reliability centered maintenance procedure: the case of centrifugal pumps in onshore industry a azadeh , v ebrahimipour, p bavar. The pump was designed to operate for a long time, and the user operated and maintained the pump in a manner that resulted in a half-century of trouble-free operation in the overall equation for reliable pump life expectancy, almost every factor is dependent on the end user—specifically, how the pump is operated and maintained. Pump ed 101 centrifugal pump efficiency – what, how, why & when etc) also affect pump efficiency, but the impeller and volute have the greatest influence lets start our investigation of centrifugal pump efficiency with the impeller double the speed and the head increases by a factor of four if you keep speed constant, the same.
10 steps to pump reliability - part 2 now let’s review steps 6-10 and finalize your journey to improve your pump reliability two major factors that determine pump system efficiency are where the pump is running on the pump curve relative to best efficiency point (bep) and what type of control system is used to control the pump. The overall efficiency of a centrifugal pump is simply the ratio of the water (output) power to the shaft (input) power and is illustrated by the equation below η = p w / p s where η is efficiency, p w is the water power, and p s is the shaft power. Hydraulic efficiency is the largest factor that decides the overall efficiency of the pump when you want to achieve optimum performance and reliability in a centrifugal pump, you must operate the pump close to its bep (best efficiency point) the bep is the most stable and suitable operating point for a centrifugal pump.
Pump reliability factors ~ sizing factors: • a 100 hp electric motor on a 50hp load will work and run smooth and cool and only use 50 hp of energy (still not recommended) • a 100 gpm pump on a 50 gpm demand is a bad bet pump will run rough, hot and waste energy pumps need to. The noria, for instance, is an ancient pump thought to be the world’s first sophisticated machine environment and nutrition, lifestyle choices and, of course, genetic predisposition these factors can be metaphorically compared to factors that influence machine life the system reliability is increased to 99% due to the redundancy. Reliability engineering deals with the longevity and dependability of parts, products and systems more poignantly, it is about controlling risk reliability engineering incorporates a wide variety of analytical techniques designed to help engineers understand the failure modes and patterns of these parts, products and systems. 10 steps to pump reliability - part 2 pumping against a partially closed valve is a terribly inefficient way to control pump output with these factors in mind, pumping system efficiency should be continuously monitored to ensure process demands are met at the lowest possible cost 8 track lifecycle history.
Mechanical: many of the pump mechanical factors/components that impact pump reliability are predetermined by the pump model and size, but the pump user can select certain critical factors such as the mechanical seal (may 2010 and july 2011) and bearing lubrication (feb 2008 and aug 2010), which are under the control of the pump user. The scope of pump reliability february 21, 2015 4303 7 share proper bearing storage, handling and installation, as well as the initial bearing housing and assembly cleanliness are factors the pump manufacturer or the repair shop can control general lubrication cleanliness, control of bearing housing contamination and monitoring of the. Reliability factors are useful for making a decision on what configuration would be best when other factors are equal or not as significant as reliable operation simply meeting a design head and flow does not necessarily mean that the pump is at its most reliable configuration.
A pump reliability coefficient value of 000 means absence of reliability where as reliability coefficient value of 100 means perfect reliability an acceptable reliability coefficient must not be less than 090, as less than this value indicates inadequate reliability of pumps. When you want to achieve optimum performance and reliability in a centrifugal pump, you must operate the pump close to its bep (best efficiency point) the bep is the most stable and suitable operating point for a centrifugal pump at best efficiency point, the hydrodynamic unbalanced load of the centrifugal pump is at its minimum. The right instrumentation can help improve pump reliability and reduce risks a petrochemical operation may have thousands of pumps and associated pumping systems they are vital systems that consume a great deal of energy, and are expensive to rebuild or replace.
4 pump selection guide model 3180 / 3185 paper stock / process all customer requirements were considered in this line of paper stock / process pumps: excellent hydraulic coverage, high efficiency, extreme ease of maintenance, and mechanical reliability the model 3185 pump furnished with iso or jis flange drilling, metric fasteners, dimensions. A thorough treatment of pump reliability encompasses nearly the entire life cycle of the equipment, including selection, design, specifications, manufacture, inspection and testing, shipment and storage, installation, commissioning, operation and maintenance. The pumps system is composed by two centrifugal pumps disposed in parallel, one pump is operating and the other pump is waiting to be demanded the system for the reliability analysis is called “stand-by redundancy” type 1 of 2, just one pump is in operating mode and the other pump is waiting for failure of the first pump.
Reliability coefficient for pumps is a number between 0 to 1, indicating reliability of a pump from lowest 0 to highest value of 1. Reliability is key for safety ethylene oxide is a hazardous fluid requiring instrumentation to detect conditions that risk plant and personnel for example, the “dead headed” overheating of ethylene oxide in a pump can lead to violent decomposition. Establish a pump management program establish a configuration management process note: steps 1 through 5 were discussed in the october/november 2012 issue of uptime magazine 6 stock the right parts one of the easiest and fastest ways to improve pump reliability is to use parts that meet the manufacturer’s original specifications.