24. Install cap screws and tighten working from the center of
the casing to each end, to the torque values in
section
. If any cap screws
require replacement, use only parts with equal or greater
tensile strength. See
25. Rotate shaft by hand to check that it turns freely.
26. Push the stuffing box bushings (63) to the rear of the stuffing
boxes.
27. The stuffing box is not packed from the factory, it should be
packed prior to startup according to the guide below.
28. Clean the stuffing box.
29. Check that the packing rings are of proper cross-section and
length.
30. Stagger the joints 90° apart.
31. The rings should butt tightly, but not overlap at the joints.
32. Tamp down the individual packing rings, but not too tightly,
as this may result in burning the packing and scoring the shaft
or shaft sleeve.
33. Where compatible, lightly lubricate the inner and outer packing
diameter with a suitable lubricant. When a lantern ring is
required, make sure that sufficient packing is inserted below
the lantern ring so that the bypass line intersects the packing
container bore adjacent to the lantern ring and is not blocked
by the packing.
34. Replace the water seal piping.
The pipe supplying sealing liquid should be fitted
tightly so that no air enters. If the pumped liquid is
dirty or gritty, clean sealing liquid should be piped to
the stuffing box in order to prevent damage to the
packing and shaft sleeves.
Clear sealing liquid is also required if the stuffing
box materials are not completely compatible with the
pumped liquid. The sealing liquid should be at a
pressure sufficient to ensure a flow of clean liquid into
the pump, but not so high as to require excessive
tightening of the packing.
35. Insert two packing rings, lantern ring (29), if provided, and three
packing rings. Insert each ring separately, and stagger the
joints of successive rings 90°.
36. Insert the packing glands (17), and set the gland bolt
nuts finger tight.
The stuffing box gland must not be too tight during
startup in order to let sufficient liquid lubricate the
shaft and the packing.
37. Rotate shaft by hand to check that it turns freely.
38. Replace all drain plugs if removed during disassembly.
39. Re-lubricate the bearings. See section
40. Make sure that the pump shaft spins freely.
22
English (US)
