Xylem G&L A-C 8100 Series, Инструкция по эксплуатации

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6.4.2 Packed stuffing box maintenance
Check or instruction Explanation/comment
When starting a pump with fiber packing for
the first time, make sure that the packing is
slightly loose without causing an air leak. As
the pump runs in, gradually tighten the
gland bolts evenly.
Never draw the gland to the point where the packing is compressed
too tightly and no leakage occurs. This will burn the packing, score
the shaft sleeve, and prevent circulation of the liquid that cools the
packing.
Turn the rotating element by hand. The stuffing box is improperly packed or adjusted if friction in the box
prevents turning the rotating element by hand. A properly operated
stuffing box runs lukewarm with a slow drip of sealing liquid.
After the pump has been in operation for
some time and the packing is completely run
in, check that the stuffing box leaks at the rate
of 40–60 drops per minute.
This indicates proper packing, shaft sleeve lubrication, and cooling.
NOTICE:
Eccentricity of the shaft or sleeve through the packing can result in
excess leakage. Make sure that the parts are properly centered.
Check the packing frequently and replace as
service indicates.
Six months is a reasonable expected life, depending on operating
conditions. Use a packing tool in order to remove all old packing
from the stuffing box. Never reuse old packing or add new rings to
old packing. Clean the stuffing box thoroughly before you install new
packing.
Check the condition of the shaft or sleeve for
possible scoring or eccentricity and make
replacements as necessary.
—
When placing new, non-asbestos packing
into the stuffing box, open the molded rings
sideways and push the joints into the stuffing
box first. Then install the rings one at a time,
making sure to seat each ring firmly. Stagger
the joints at a 90° rotation from each
preceding joint.
—
6.5 Cleaning without dismantling the pump
A short section of pipe so designed that it can be readily dropped out of the line can be
installed adjacent to the suction flange. With this arrangement, any matter clogging the
impeller is accessible by removing the pipe section.
If the pump cannot be freed of clogging after the above methods have been tried,
dismantle the unit as previously described to locate the trouble.
6.6 Disassembly
6.6.1 Disassembly precautions
This manual clearly identifies accepted methods for disassembling units. These methods
must be adhered to.
WARNING:
• Make sure that the pump is isolated from the system and that pressure is relieved
before you disassemble the pump, remove plugs, open vent or drain valves, or
disconnect the piping.
• Always disconnect and lock out power to the driver before you perform any installation
or maintenance tasks. Failure to disconnect and lock out driver power will result in
serious physical injury.
• Crush hazard. The unit and the components can be heavy. Use proper lifting methods
and wear steel-toed shoes at all times.
6 Maintenance
G&L Pumps Series A-C 8100 Base Mounted Centrifugal Pump INSTRUCTION MANUAL 31