Category Archives: Lomakin Effect

Case Study: Upgrade Your Pumps for Reduced Steam Consumption

A major unit at a petrochemical facility in Asia recently upgraded a Byron Jackson boiler feed pump with Vespel® CR-6100 non-metallic wear rings. This pump is driven by a single stage steam turbine. The objective of the upgrade was to reduce steam consumption.

The case wear rings in the 9 stage pump were upgraded to Vespel® CR-6100 , along with the center and throttle bushings. Using the non-metallic composite Vespel® CR-6100 allowed a reduction in the wear ring clearance. All components were fabricated with the Boulden PERF-Seal® design, which helps the pump achieve higher efficiency and improved stability compared to conventional smooth bore wear rings.

Benefits of Updating Case Wear Rings to Composite Materials

After the upgrade, plant personnel measured steam consumption assuming the same pump operating conditions as before the upgrade. The results were the following:

  • Total efficiency improvement of nearly 5%.
  • As the customer operates pump for 140 days per year, steam savings are $26,000 per year.
  • Radial vibration after the upgrade was significantly reduced by nearly 50%.

Because of the success of this upgrade project, the site is considering upgrading many more high-energy pumps with Vespel® CR-6100 and the PERF-Seal® design.

Vespel® CR-6100 case wear rings in a 9 stage pump

 

 

 

 

 

 

 

 

 

 

 

Higher efficiency and lower vibration are typical benefits of an upgrade to Vespel® CR-6100 and the PERF-Seal® design.

If you have a high energy pump, whether a charge pump, boiler feed water pump, or product shipping pump, consider upgrading the wear components during your next repair. You can save a ton of money and make the pump run better. Contact Boulden to discuss your application. If you have a pump currently in your shop or arriving soon, we have the material you need in stock and can deliver what you need quickly.

Save Money on Your Next BB3 Pump Overhaul

How to re-use the worn wear rings for better performance

Axially split, between bearings multi-stage pumps (API Type BB3) are used for some of the most important services in the hydrocarbon processing industry–charge pumps, boiler feed pumps, and product shipping/pipeline pumps.

The repair of these pumps is a great opportunity to upgrade with Vespel® CR-6100 or Boulden B-Series composite wear rings. In many situations, this will also be the most cost-effective way to rebuild the pump.

Cost of Repair
The reason these pumps offer a great value upgrade is because the case rings in axially split pumps can generally be re-used as holders for composite “inserts” as shown in figure 1.

This method of repair saves the cost of purchasing new case rings, or machining full rings with milled features. All of the work can be done on a lathe at the time of repair. First, you machine the inside bores of the existing case rings, throttle bushing, and center bushing. Then, you make the Vespel® CR-6100 inserts, press them in, and then final machine the parts to reduced clearance. This will increase the Lomakin Effect and efficiency of the pump.

Complete the remaining elements of the overhaul as you normally would. When the pump goes back into service, it should be easier to operate, more efficient, and more reliable.

Final Thoughts

If you have a BB3 pump coming through your shop for overhaul, consider upgrading to composite wear parts. Boulden can help you engineer the upgrade to Vespel® CR-6100 or Boulden B-Series and the patented Boulden PERF-Seal® design to ensure long-term reliable success. Contact us today. We have the material you need in stock.

Helpful Links:

Boulden Installation Guide for Vespel® CR-6100

Standard Stock Sizes of Vespel® CR-6100

Amine Stripping Pump Case Study

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