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Byron Jackson Process Water Pump Improvements

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Application: Pond Process Water
Pump Details: Byron Jackson 32KXL
Pump Type: Multi-Stage Vertical

Industrial pumps are sometimes repaired or modified by smaller local repair shops that do not have the engineering oversight to ensure that the repairs and modifications meet the original design’s intent. When Hydro received this pump, it was clear that prior modifications that had been performed without engineering review were causing problems.

This pump had been “upgraded” by replacing the upper bearing with an enclosure tube, which was not part of the original design. The lack of that bearing contributed to the instability of the top shaft and may have lead to the pump’s failure.

After fully reverse engineering the pump, Hydro redesigned the existing enclosure tube to incorporate the missing upper bearing. The modification involved machining the enclosure tube into two pieces and joining them together with a coupling and adding a bushing to stabilize the shaft.

Because the spare parts provided were of an older design and no longer fit the pump, Hydro manufactured several parts. These included a new transition piece, diffusers, a new bearing, and suction bell. Moreover, the impeller vane tips were weld-repaired and re-machined, and the impellers were then balanced to 4 W/N. The pump, which was rebuilt to standard specifications and reconstructed using a durable stainless steel, was returned to service successfully.

Learn more about Hydro’s targeted upgrades for the pulp and paper industry here.

Lear more about Hydro’s Scotford service center, the service center that spearheaded this project, here.

Capability Spotlight: Adopt a Higher Standard

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Improving performance and life isn’t always about making big changes to design and operation. Small improvements to the standards and processes that are used during refurbishment and assembly can result in outsized benefits.

Hydro specifies machining and fit-up tolerances that often exceed the required industry standards and are best-in-class for the pump industry. Taking the extra time to meet more stringent tolerances ensures better concentricity and parallelism of critical components, reducing the risk of contact between the rotating and stationary elements during operation. Reducing component contact will result in reduced vibration and reduce the rate of wear for close clearance components. Maintaining design clearances greatly contributes to longer mean-time-between-repairs by providing greater stiffness and damping to the rotating assembly and reducing internal recirculation, which in turn affects performance and efficiency. To learn more about the importance of maintaining design clearances, read our Hydro Learning Hub white paper on the subject.

Another improvement that is standard at Hydro for repairs of multistage barrel (BB5) pumps is a dimensional analysis to identify relative centerlines of all impellers to their respective diffusers. This process and the resulting actions to ensure centerline compatibility at each stage are essential in prolonging equipment life and counteracting latent failure mechanisms.

By adhering to stricter tolerances, requiring robust process documentation, and never cutting corners, Hydro’s rebuild process results in greater reliability and increased mean-time-between-repairs. This level of quality ensures a safer work environment for our end user customers, reduces waste by decreasing the frequency of maintenance cycles, and lowers overall cost of ownership.

Learn more about the importance of axial centerline compatibility in multi-stage pumps in this case study.

Find your local Hydro Service Center and ensure high quality equipment rebuilds.

Innovative Vertical Pump Sealing Solutions

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Upgrade in Action: HydroSeal 

Vertical pumps have reliability and maintenance considerations unique to their design and application. One of these considerations is the pump seal design. Many vertical pumps rely on packing in lieu of mechanical seals. While it is a less sophisticated design, packing has benefits for vertical pumps, including greater ability to handle fluid with particulates, less sensitivity to misalignment, and greater stiffness and damping provided at the seal location. However, packing also has multiple disadvantages, foremost of which is the need to continuously adjust the packing gland to maintain the desired leakage rate and the requirement that some fluid must leak to the atmosphere. The cost associated with replacing worn components in the packing area is another notable drawback.

 

In cases where any of the disadvantages associated with packing or a mechanical seal noticeably impact reliability or the cost of operation, upgrading to a seal casing design is an attractive alternative. This is the decision that a pulp and paper mill in the Southeastern US made when experiencing reliability and environmental concerns in their River Water pump system. Faced with the need to install a new sealing device, they decided that the ability to avoid aboveground leakage and eliminate time-consuming periodic maintenance justified the investment in a vertical pump seal casing.

Read the full case study in World Pumps March/April 2024 edition.

Learn more about Hydro’s Hydro South service center and Hydro’s Engineering Services.

Capability Spotlight: High Capacity Pumps

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From lifting massive weights, to reverse engineering components with expansive surface areas, to troubleshooting vibration in machines susceptible to resonance problems, large vertical pumps have unique challenges. Fortunately, Hydro has cultivated specialized capabilities to meet these challenges.

The first challenge is gathering dimensional data and providing reliable, quality parts supply. Large pumps are expensive to ship off-site and often run without a spare. Being able to capture precision measurements of critical parts on-site reduces both cost and risk. Hydro’s reverse engineering team is experienced in how to efficiently and accurately reverse engineer large components.

The field portion of the reverse engineering process for a large part can usually be accomplished in less than a day. After the measurements are taken, the pump can be returned to service while the model is completed and the part is manufactured.

Taking the initial component data is only the first step in Hydro’s reverse engineering process. Using their experience in the failure modes and upgrades of large pump designs, the reverse engineering team will recommend component upgrades or improved metallurgy to extend the life of the part. Where appropriate, they will also identify methods of refurbishment that can return a large part to reliable service in place of supplying a new component.

Another challenge when working on large pumps is that they require a shop with the appropriate tooling and lifting capacity. It also requires a team dedicated to providing a higher standard of repair. Because vertical pumps are made of several stacked components, maintaining tight tolerances and best-in-class fit-ups is critical for reliable operation. Hydro’s standards are more stringent than those required by any industry body. This translates to longer life, better performance, and safer operation.

Take a tour of Hydro’s Hydro East facility in the Philadelphia metro area, who have a special focus on large vertical pumps.

Introducing: Hydro East from Hydro, Inc. on Vimeo.

 

Learn more about our capabilities that support high capacity vertical pumps or contact us for more information.

Navigating Resonance Challenges

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A Case Study in Diagnostic Testing and Innovative Solutions

Some services are inherently difficult due to factors such as fluid quality or multiple disparate operating points.  These factors are an inherent part of the process and cannot be changed to improve reliability. Harsh applications can be a costly prospect, both in overhaul costs and in the time and labor required for frequent servicing. Many times we become caught in the perception that there is no improvement to be had for these services. A short mean-time-between-failures (MTBF) becomes routine and expected, and maintenance activities and parts procurement are built around this expectation.  

When equipment is sent out for refurbishment, the expectation is that mechanical and hydraulic performance upon reinstallation will be better than what was experienced in the worn condition. This assumption holds true in most cases; however, sometimes unexpected behavior can occur after a pump is remanufactured and reinstalled. While it is easy to jump to the conclusion that these performance changes were caused by errors made during the repair or installation of the equipment, sometimes the problem is more complex and related to latent weaknesses in the design that had lain dormant until refurbishment.

This scenario was experienced by a power utility in the Southeastern US when they ran into significant vibration increases after one of their boiler feed pumps was refurbished by a local repair shop. Concerned by the level of vibration, the utility reached out to Hydro South, who have extensive experience in this application and model. From there, Hydro Reliability Services was called on to collect data on the problematic equipment and use advanced modeling tools to understand the nature of the vibration. The field testing and analysis revealed that pump had been operating with a very small margin between a structural resonance and one of the pump forcing frequencies. Armed with this information, solutions were developed to increase this margin and return to stable operation.

Read the full case study in Pumps & Systems March 2024 edition.

Learn more about Hydro Reliability Services and how they support field testing, vibration troubleshooting, and advanced system studies.