Pump Inspection. Dismantle the pump and inspect thoroughly each year
according to the following schedule:
Remove and examine all valves, valves seats, and springs.
Reface valves and valve seats as necessary and replace worn or defective parts.
Remove all old packing and repack.
Check the pump and driver alignment.
Check the plunger or rod for scoring or grooving.
Clean the interior and exterior surfaces. Paint the interior with
suitable underwater paint or protective coating. Paint the exterior.
Sludge Pumps. Two types of sludge pumps, reciprocating and
progressive cavity, are discussed here. Maintain centrifugal-type sludge pumps
according to the procedures previously presented for centrifugal-type pumps. Modify
the procedures listed to conform to manufacturers' manuals. For lubrication
requirements of all sludge pumps, consult the manufacturer's manual.
Packing Procedures for Reciprocating Sludge Pumps
Daily, or more frequently if necessary, check the sight-feed oil cup,
if one is provided for lubrication between the plunger and the stuffing box. Add a squirt
of oil around the plunger as often as necessary.
At varying intervals, renew the packing when no takeup is left on
the packing-gland bolts.
Remove the old packing, and clean the cylinder and piston
walls. Place new packing in the cylinder and tamp each ring into place. Be sure that
the packing ring joints are staggered.
To break the packing, run the pump for a few minutes with
the sludge line closed and the valve covers open.
Turn down the gland nuts, no more than is necessary, to
keep sludge from getting past the packing. Be sure all packing-gland nuts are
tightened uniformly. When chevron-type packing is used, make sure that the nuts
holding the packing gland are only finger tight to prevent ruining the packing and
scoring the plunger.