When we talk about the efficiency of a machine, we are basically referring to its capability to convert one form of energy to another. How well the machine does it becomes its efficiency. Coming to our central topic of discussion, centrifugal pumps are highly effective and efficient and are thus in great demand.
When you introduce solids and increased temperatures or speed into a pumping system, pump performance can deteriorate even more quickly. It also avoids lengthy delays due to lead times from pump manufacturers. Monroe Country Study Results Inthe Monroe County Water Authority MCWA in Rochester, NY, began a pilot study to test the impact of removing Reliability factors of pumps corrosion and tuberculation from three horizontal split case pumps and then applying protective coating to the restored surfaces.
The results of the study surprised even the most skeptical staff members: The study, which was conducted in independent steps, showed: The combination of sandblasting and the application of protective coatings were a major factor in bringing the pump back to expected performance levels.
Sandblasting alone contributed on average a 4. However, after several months this declined. Pumps that were both sandblasted and coated effectively matched the gains provided by mechanical restoration and retained performance for a longer period of time compared to pumps that were simply mechanically restored and sandblasted.
Restoration and Sandblasting Restoration is mechanical in nature. Replacing worn wear rings, bearings, and balancing impellers provides significant gains in performance and efficiency. However, no modifications have dealt with scale and corrosion in the wet end of the pump.
Sandblasting removes tuberculated rust and scale from the pumps hydraulic passages — opening up passages and reducing pipe friction losses. The polymer-based coating provides both corrosion protection and reduction of surface roughness of the otherwise uncoated, wet-end base metal.
Coatings improve the use of energy by reducing frictional losses associated with scale and tuberculation: The applied polymer coating will significantly reduce surface roughness which directly impacts the amount of energy transferred to the fluid by the impeller.
Protective Coatings Choosing the Optimal Coating In selecting a coating, the following factors come into play: Several key factors to consider are: What is the potential for, and impact of, a coating that disintegrates and contaminates the process flow?
This can have many sources: The use of glass or resin coatings can help to increase and maintain a good hydraulic efficiency over a long period of time, and for larger pumps many users specify these coatings as standard.
Sand casting results in a rough surface finish RMS which induce frictional losses and can accelerate erosion eddies.A Pump FMEA Approach to Improve Reliability Centered Maintenance Procedure: The Case of Centrifugal Pumps in Onshore Industry A. AZADEH *, V. EBRAHIMIPOUR, P. BAVAR reliability of the system by maximizing the equipment availability, and consequently the system performance is improved.
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 and July ) and bearing lubrication (Feb.
and Aug. ), which are under the control of the pump user. 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.
While it is true that sealless magnetic drive pumps feature fewer leak paths and their components boast higher reliability than traditional sealed pump designs, the reluctance some engineers have toward acceptance of this proven technology is the legacy of a handful of early historical failures.
Marcia, a reliability engineer at a regional water supplier, is responsible for ensuring the reliability of all pumps that provide water to customers in the region.
Marcia conducts a condition assessment of the pumps every three years and manually records the results. She wants the condition of the. Reliability Issues – Centrifugal Slurry Pumps Introduction Pumps were probably the first machine ever developed, and are now the second most common machine in use around the world, out-numbered only by the electric motor.