
36 Practical Centrifugal Pumps
Packing properties can be enhanced by including other special materials during braiding
of the packings, to handle contaminants, acids, alkalis, temperature, speed, and other
factors. For example, a material called as Aramid can enhance the mechanical properties
of the packing. This helps in prevention of extrusion of packing and withstands slurries
and abrasives in liquids.
2.6 Seal housing/mechanical seals
The stuffing boxes described above have many disadvantages and these include:
• A persistent leakage and loss of product if the shaft surface is not smooth.
• If the gland is too tightened, the shaft/sleev ...