Selecting the correct packing for your application is often a balancing act between choosing different materials. Aramids are tough and resilient, but have high friction and fret shafts and sleeves. PTFEs are extremely low friction and kind to shafts, but can consolidate and extrude. All of these issues cause a loss of compression, resulting in leakage and requiring packing adjustments.
Chesterton DualPac® 2211 is built to address these issues by combining two complimentary materials into one packing. Using Chesterton’s patented braiding technology, graphite filled ePTFE can be placed against the shaft where it provides superior sealing and low friction. A high strength and resiliency aramid is placed against the stuffing box bore to resist consolidation without shaft wear. Both lab and field tests have shown that DualPac requires fewer gland adjustments, resulting in drastically extended life in severe service applications.
Increased Reliability for Cyanide Pulp Pump
A gold mine sealing a cyanide pulp with 60% solids was running through packing every 3-5 days. After four rings of DualPac 2211 were installed in 4 pumps, the Mean Time Between Failure improved to 25-35 days; Packing savings: Nearly $800/month; Sleeve savings: Over $1,100/month; and the Total annual savings: $23,000+/year.
Trouble-Free Performance for Gypsum Slurry Sealing
In a fertilizer mineral processing operation, attempts to seal abrasive gypsum slurry were difficult. Packing and shaft required replacement every few days. Gypsum material entered the stuffing box and caused pump to leak. Five rings of DualPac 2211 were installed, resulting in: 28+ days of trouble-free performance; Labor savings: $1,000/month; Product loss savings: $4,200+/month; and Total annual savings: Nearly $70,000/year.