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Stuffing Box Design and Installation of Compression Packings. The importance of packing glands correctly cannot be over-emphasised. Many packing failures are due to incorrect installation of the packing. The following steps have been devised to ensure effective installation of packings on pumps and valves. Sealing Products.
The stuffing box is a packing assembly or a shaft seal that is used as a sealing device to prevent leakages of air or water or steam from rotating or sliding shaft. They are mostly used in the pump to prevent fluid leakage.
The stuffing box is an annular space around the stem where packing rings are inserted for stem sealing. The stuffing box may contain one or more lantern rings, which are hollow rings placed between packing rings for different purposes, such as cooling the packing rings by separating them.
With a more thorough understanding of the interrelation of stuffing box pressures, rubbing speeds, and leakage temperatures, improved water-cooled stuffing boxes have been built for temperatures up to 200°C (400°F), and stuffing box pressures up to 35 bar (500 psig), without pressure-reducing breakdowns or labyrinths.
Selection Criteria. There are three major criteria to packing selection: pH level of the fluid being pumped, fluid temperature, and shaft speed. Why these three? Packing is designed to expand radially against the shaft and stufing box to create a compression seal that will control prod-uct leakage and prevent the loss of valuable process fluids.
Strictly, the term “stuffing box” is related to the packed box shaft seal, long the principal device used to seal a pump’s casing where the shaft passes through it. Although the number and variety of devices used for this purpose has increased...
For a suitable design of valves distinct characteristics of packings for stuffing boxes are required, describing the deformation, relaxation, friction, and tightness behaviour. These characteristics are defined and the testing procedures for their experimental determination are developed.
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