Energy: a mechanical seal consumes 7% a braided packing
Advantages/disadvantages of sealing slurry pumps with mechanical seals
Water saving: a double mechanical seal with API plan 53 can consume 10 gallons a year, a braided packing thousands of gallons of water.
The mechanical seal for pulp with API plan costs about $ 20,000 for 2 "shaft.
A mechanical seal requires skilled labor.