Configuring automatic health scores for pumps 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.
When Reliability factors of pumps 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.
|Before you begin||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.|
|Inadequate NPSH margin may affect pump head, noise, and vibration — all leading to reduced pump service life and higher costs.|
|Labyrinth oil seal advantages 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.|
Monroe Country Study Results Inthe Monroe County Water Authority MCWA in Rochester, NY, began a pilot study to test the impact of removing the 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. In addition, some pumps are designated for potable water service, and many of these will require a NSF-certified coating.
In both of these cases, coatings can be used to enhance performance and provide extended reliability where rough sand cast finishes are present and provide potable water compliant contact surfaces for the life of the pump. Are you considering refurbishing your pumps?
Our experienced team is on call to help. Contact us for a Plant Visit or email our Ask the Expert desk.Scroll Pumps offer clean and predictable performance Current scroll technology and tip seal design are factors that work together to provide low base pressure, and a gradual increase in base pressure over the service life.
Emschergenossenschaft wanted pumps that would deliver reliability over the long term and economical operation that would deliver energy efficiency. Given that the complete system has a designed lifespan of years, it is impossible to predict with total accuracy the many factors that will affect the performance of the pumping system so far ahead.
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. 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. information on the sensitivity of the reliability to various factors in the building operations such as, rate at which tenancy changes occur, monitoring of valves and back up batteries, maintenance procedure etc.
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.