It’s a fact, any pump part that comes in contact with an abrasive slurry will inevitably wear out and need replacing. However, if your pump is currently wearing through parts at an obscene and unacceptable rate, it doesn’t mean it’s something you need to just accept as the status quo. Proper material selection is essential for extending pump longevity and with almost a century of material expertise at our fingertips, Wilfley can help maximize the wear life of your pumps.
One of the worst nightmares for a production manager is when a key piece of machinery fails and you’re forced stop production and lose critical time and money. Something as dreaded as this only needs to happen once to keep you up at night worrying until the root cause has been found and preventative measures have been put in place to ensure it doesn’t happen again. Wilfley recently had the opportunity to ease the troubles of a customer in need and hopefully help them sleep a little easier at night.
Material excellence has always been one of the pillars of Wilfley’s success, solidified by a restless focus on operational longevity and optimized value. By contrast, many suppliers focus intently on reducing cost without consideration to increasing value. Unfortunately, a low initial price with increased on going costs favors the supplier, not the user.
One such example of Wilfley’s excellence and operational value is found in a large scale phosphoric acid plant. Conditioned to utilize material of construction based on corrosion resistance alone, a very large producer in Western Asia originally mandated 904L (ASTM A743 Gr CN3M Mod / UNS N08904) for the metallurgy for their cake wash pumps.
Basic Wear Mechanisms of Centrifugal Pumps Built in Stainless Steels
Due to general pump design the solid particles in pump fluid have a small angle of impingement against the wet end components. Therefore, impacting wear has very little effect on the overall deterioration rate of a material. Sliding wear, however, is considerably more harmful because it compounds shear stresses to the normal stresses that are already imposed. This increases the material plastic flow and fracture tendency in the contacting regions of solid particles and pump parts.
The Model A9 heavy duty centrifugal pump is a proven design that provides extended mechanical seal life and maximum uptime and represents the culmination of nearly 90 years of continuous improvement in chemical process handling equipment. A modern descendant of the ground-breaking Model AA released in 1929, the A9 meets or exceeds the requirements of ASME B73.1 specifications, yielding superior results for lowest overall cost and highest uptime. Designed for continuous duty and high specific gravity fluids, it is truly engineered to deliver reliability and longevity for mission critical services.
There is a common misconception in the pump industry that dynamically sealed pumps have higher operating costs due to the extra power required by the expeller. This may appear to be true if you only look at the electricity required to operate the pump but when you look at the bigger picture, it couldn’t be further from the truth.
As the dust settles and the path of product flow is completed upon our new floor, we turn as a team to more focus on what is next; where and how to inform ourselves to provide the platform for confident directives, determining where we must align and adapt, calling for the check to our depths of courage to lead whole-heartedly, and the push into more diversity in a changing, developing market.
Wilfley’s hockey team, White Quail Hockey Club, retains its position of title holder to the Division 2 adult hockey league competition in Lowry, Colorado this month, marking its third trophy in three seasons.
Wilfley heavy duty centrifugal pumps are designed for long life with minimal maintenance. Even so, some pump maintenance is required and should be carried out on a consistent basis. Maintenance procedures and checklists vary by pump model and type, as well as service requirements so the most accurate information and troubleshooting guidelines can be found in your Installation, Operation and Maintenance (IOM) Manual. These critical resources are available in the literature section and through our customer service department.
Maintenance and troubleshooting questions concerning motors, baseplates, couplings, instrumentation, and other accessories manufactured by outside vendors should be directed toward the appropriate vendors’ instruction manual, also available through Wilfley’s customer service department.
In summer, 2014, long-time Wilfley representative, Scheel & Company, began discussing a difficult application with a customer in Kentucky. The customer re-processes activated carbon, requiring a heavy carbon slurry to be pumped from tall holding tanks into their process.
The existing pumps worked well enough hydraulically, but had problems handling the carbon slurry due to the gland packing. The carbon slurry acts on the packing, causing it to harden-up and begin wearing the shaft sleeve. As the sleeve wears, significant leakage occurs, requiring frequent replacement of the sleeve and packing, and associated downtime, labor, etc.
Most importantly, the leaking carbon slurry is an environmental hazard, requiring the customer to capture, treat, and account for all leakage. The photo below shows the area under the tanks, and the leakage in the containment area.