Make Your Vertical Pump Shaft Bearings Last Longer

DuPont™ Vespel CR-6100 resists seizing, can run dry, has high impact resistance, and a low wear rate for a long life under a wide range of process conditions. Vertically Suspended Pumps Vertically suspended pump types (API types VS1-VS7) use long, flexible shafts which are supported by a series of product-lubricated shaft bearings. Vespel® CR-6100 is a Read the full article…

The Final Installation Steps: Length and Clearance

Setting the final dimensions of your DuPont™ Vespel CR-6100 component Review We have discussed how to measure your pump, prepare the metal parts, and establish the press fit for your Vespel® CR-6100 installation. The final two dimensions you need to establish are the part length and the clearance. The Part Length Vespel® CR-6100 has an extremely Read the full article…

The Interference Fit – Setting the interference fit value for DuPont™ Vespel CR-6100

The interference fit value for DuPont™ Vespel CR-6100 Review We have discussed how to measure your pumps and prepare the metal parts. The next step is to machine the DuPont™ Vespel® CR-6100 part to have the correct dimensions. Remember, Vespel® CR-6100 is used for stationary wear parts like wear rings, throttle bushings, and vertical pump shaft Read the full article…

Prepping Your Metal Parts

Prepare your pump parts for an upgrade to DuPont™ Vespel CR-6100 Review on Pump Parts and upgrading to Vespel CR-6100 The National Geographic Channel used to run a show called Doomsday Preppers where survivalist families would prepare for apocalyptic disasters and societal collapse. Although that sounds like a lot of fun, at Boulden, we are more concerned Read the full article…

Measuring Your Pump

Which information is needed in order to upgrade your pump to DuPont™ Vespel® CR-6100? Review Using Vespel® CR-6100 wear parts with reduced clearance can help your pumps be more reliable, efficient, and easier to operate. Which measurements and which process data do we need to assemble for the upgrade? Dimensions Needed for a Quote Let’s start with the Read the full article…

When to Reduce the Clearance in Your Pump with DuPont™ Vespel® CR-6100

The industry “rule of thumb” says to reduce the wear ring clearance by 50%, but this isn’t always true. Vespel® CR-6100 Upgrade Review When you upgrade your pumps to Vespel® CR-6100, there are two steps: Eliminate the metal-to-metal contact points in the pump Reduce the running clearance (of the wear rings and throttle bushings) However, Read the full article…

Upgrade to DuPont™ Vespel® CR-6100: 100%

There is great satisfaction in doing a job all the way. 100% In South Africa, when you make a statement that someone agrees with, they say “100 %”–similar to how other English speakers say “absolutely.” With that in mind, we want the pumps upgraded to Vespel® CR-6100 to be upgraded 100% whenever possible.   Review Read the full article…

Useful Links for using DuPont™ Vespel® CR-6100

Tools to help you improve your pump operability, reliability, and efficiency 20 Years of  Vespel® CR-6100 Our favorite material recently passed a milestone. The first pump ever fitted with Vespel® CR-6100 was upgraded 20 years ago in November 1997.   The first pump was a vertically suspended condensate pump at a refinery in California. The pump Read the full article…

Case Study: DuPont™ Vespel® CR-6100 in 3MW Boiler Feed Water Pump with PERF-Seal™ design.

Better operability, reliability, and efficiency The PERF-Seal™ A while back, we introduced the PERF-Seal™ design for center bushings, throttle bushings, and pump wear rings.   Below you can see the center bushing and case wear rings of a 2-stage pump which was upgraded to Vespel® CR-6100 with the PERF-Seal™ design The holes drilled in the PERF-Seal™ create a turbulence Read the full article…

The Effect of Wear Ring Clearance on NPSHR

Recommended reading from the 32nd Pump Users Symposium, 2016 A Short Break In recent weeks, we have discussed how an upgrade to composite wear rings allows you to avoid pump seizure, and therefore reduce the wear ring clearance in your pump. This reduction in clearance increases the Lomakin Effect in the pump and improves pump efficiency. One thing we Read the full article…