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DualPac® 2211 Packing Helps Extend Ash Pump Life at Power Plant


Chesterton products – Chesterton DualPac® Packing Technology


A power plant in Bulgaria was struggling with sealing problems in their ash pump. With their original packing and shaft sleeve needing constant maintenance and repair, the customer wanted to achieve at least six months without the need for replacement. Luckily, DualPac® 2211 was up for the challenge!

Products featured in this case study:

A close up of DualPac 2211

DualPac 2211


A power plant in Bulgaria has sealing problems with an ash pump. The existing packing lasts about two weeks due to the abrasive slurry and it needs constant adjustments which, combined with leaking product, resulted in excessive sleeve wear. The shaft sleeve needs replacement every three months. The customer’s goals were to achieve two months of continuous service to support the plant cycle and to achieve at least six months without replacing the sleeve.

Sealing problems with an ash pump

Before Chesterton intervention.


The customer installed DualPac 2211 packing in the configuration shown below.

DualPac 2211 configuration.

DualPac 2211 configuration.


Average MTBF of packing increased to three months. The MTBF of the sleeve increased to 12 months.

Total Savings (less the cost of the product): $1,100 US ($1400 AUD)/month

Total Savings: $13,300 US ($17,200 AUD)/year

Based on the success of the field test and return on investment, the Chesterton representative hopes to standardise DualPac 2211 packing as a seal for all four ash pumps and lime milk pumps in the plant.

The ash pump works fine after installation of the seals

After installation.

About Us


Chesterton® is a world leader in helping process industry companies and manufacturers improve the reliability and efficiency of their rotating, stationary, and fluid power equipment platforms. We are known across a wide range of industries for our award-winning pump and valve sealing solutions, applications expertise, equipment maintenance and wear-prevention products, and knowledgeable hands-on local service​.

® Registered trademark owned by A.W. Chesterton Company

Issued 06/21

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