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…

7 Rules for Using Vespel® CR-6100

We just completed our series on upgrading pumps with DuPont™ Vespel® CR-6100, getting into details on how to upgrade various horizontal and vertical pump types. We discussed reducing the clearance of the wear rings, upgrading throttle bushings with the PERF-Seal design, and upgrading vertically suspended pump shaft bearings. Today, let’s try to condense it all down into Read the full article…

Upgrading Pumps With Composite Wear Components Part: 10

Part 10: Vertically Suspended Pump Installation Tips Review We have discussed how upgrading your pumps with Vespel® CR-6100 helps to eliminate pump seizures, allowing you to reduce wear ring clearance, which improves pump efficiency and improves pump reliability by increasing the Lomakin Effect in the pump. Quality repair and installation practices are an essential counterpart Read the full article…

Upgrading Pumps With Composite Wear Components Part: 9

Part 9: Vertically Suspended Pumps with Separate Discharge (API Type VS4) Review Last week, we looked at vertically suspended pumps with the discharge through the column. This week, we take a look at vertically suspended pumps with a separate discharge (API Type VS4). Vertically suspended pumps with separate discharge are generally used for sump pumps Read the full article…

Upgrading Pumps With Composite Wear Components Part: 8

Part 8: Vertically Suspended Pumps (API Types VS1–3, VS6, VS7) Review To date, we have addressed how to install DuPont™ Vespel® CR-6100 into the various horizontal pump types to eliminate metal-to-metal contact points in the pump and minimize the risk of pump seizure. This allows a reduction of clearance which improves efficiency and rotor stability. This segment will discuss Read the full article…

Upgrading Pumps With Composite Wear Components Part: 7

Part 7: Between Bearings, Radially Split Pumps (API Types BB2, BB4, and BB5) Review DuPont™ Vespel® CR-6100 is a composite material which is used for the stationary wear parts of your pump and can be used in nearly all process chemicals from cryogenic temperatures to 500 F (260 C). The upgrade to Vespel® CR-6100 wear parts Read the full article…