Gland Packings - Durable Enclosures For Dynamic Sealing , Chemical Resistance And High Thermal Stability

Good
chemical resistance to fluid contained
Should
not get effected by the temperature of
application

Should
be reasonably compressible and have a good
resilience

Should
retain the self lubricants

Should
not effect the shaft

Should
not contaminate the fluid being contained

The
clearance between shaft and neck-bush at the
bottom end of the stuffing box. The maximum
normal clearance is 0.25mm.

Concentricity
of shaft with stuffing box bore.

Straightness
of shaft (run-out)- not to exceed 0.5mm. Clock
gauge reading

Condition
of shaft surface in packing area-no excessive
grooves, scores or pitting

Pump
Bearings--wear can induce shaft "whip"
which can be harmful to packings.

Ensure
that all the old packing is removed and the
stuffing box is clean and free from foreign
matter.

Always
re-pack with new packing

Select
correct size of packing to fit the stuffing box dimensions

Wrap
packing on the shaft and cut into rings of
correct size

Fit
each packing individually by tamping or with
split sleeves

Stagger
joints in consecutive packing rings
Fit
gland follower and check that the shaft rotates
freely

Tighten
gland nuts evenly with spanner until the package
"drags" when turning the shaft
by hand.

Valves-pressurize
the stuffing box and if necessary re-adjust the
gland nuts evenly until a leak-free seal is
obtained.

Pumps-Slacken
the gland nuts back and re-tighten to finger
tight, to such an extent that the shaft still
rotates freely.