Figure 6-19.Packing installation procedures-Continued.
prevent leakage but must also do this without causing
excessive friction and undue wear of the moving part.
Although most packing has definite lubricating
qualities of its own, lubrication is enhanced by
permitting small amounts of liquid or steam to leak
past or through the packing. If the pump is used for
corrosive or abrasive fluids, then some other form of
lubricant, such as grease or oil, must be fed to the
packing through external means.
compression of the packing around the joint is
controlled by hand-adjusted gland nuts.
Packing usually takes the form of coils, rings, or
spirals. The packing is inserted into a stuffing box
fitted around the sliding or rotating joint. The
The selection of the proper type of packing for a
pump is important. There is no general-purpose or all-
purpose packing. The specific type of packing that
must be used depends on several factors, such as
whether the packing seals a rotating or sliding joint and
the type of liquid handled by the pump. In any event,
you do not have to select the packing. Locally
prepared guides and manufacturers instructions
specify what type of packing material to use. Upon
receipt of the packing, note its condition and the use