Case Studies
Improving Gland Packing Performance in Recirculating Water Pumps
Challenge
Background
At an oil refinery, the gland packing was causing several issues, and the customer wanted to convert to a mechanical seal. However, the high installation cost and the need for external flushing led them to consider an alternative solution.
- Packing overheating
- Excessive leakage
- Frequent gland adjustment
Root Cause
- The same number of packing rings were installed before and after the lantern ring
- High surface speed (8.8 m/s)
- Poor water quality caused scale buildup
Packing Arrangement (Before Improvement): 6 packing rings with self-flushing.
Solution
Equal packing rings on both sides of the lantern ring caused pressure buildup, blocking seal water flow and reducing lubrication, which led to overheating. A restriction bushing was installed at the back of the stuffing box, and the packing was upgraded to a high-speed, slurry-resistant type.
Recommended Products
Chesterton 14K Restrictor Bushing
- Prevents contaminant ingress
- Extends packing life
Durable carbon fiber packing with high sealing performance
Self-lubricating, carbon fiber-reinforced packing for high-speed applications
Chesterton Gland Packing 477-1.
Results
Customer Feedback
Five years after implementing this solution across five units, the following improvements were observed:
Conventional Method
Packing required replacement twice per year, with overhauls every three years.
Total cost over 5 years (5 units): ¥5,500,000
Improved Method
No packing replacements were required over 5 years. Gland adjustments were minimal, and no overhauls were needed.
Costs were limited to initial packing purchase and installation.
Total cost over 5 years (5 units): ¥1,975,000
Cost Savings
¥3,525,000 reduction in maintenance costs
Proposed Solution: Combination of Chesterton Restriction Bushing 14K, Gland Packing 477-1, and 1400R.
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. Chesterton product range includes mechanical seals, packing and gaskets, industrial lubricants and coatings.
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