Gardner Denver PZG – 7” Operating And Service Manual - page 8
15-600 Page 3
loads. For these smaller loads the lifting devices
should be fastened to the lifting attachments normally
built into the individual motor, engine, pump or
transmission/torque converter, or their separate
support skids.
When lifting subassembled components, for example
a suction stabilizer attached to suction piping or a
discharge pulsation dampener attached to a strainer
cross and piping, use special lifting slings designed to
safely support the combined weight of the
components. If a crane or hoist is being used to lift
large components or assemblies, one or more
persons should assist the operator from the ground
with guide lines attached to the equipment being
moved to properly position it and prevent uncontrolled
movement.
When you start to lift a pump, package unit,
subassemblies or individual components and you
observe the equipment is tilting, or appears
unbalanced, lower the equipment and adjust the lifting
device to eliminate these improper lifting conditions
before proceeding to move the equipment.
It is poor practice and dangerous to allow the
equipment to pass over or close to your body or
limbs. Be prepared to move quickly out of danger if
equipment starts to fall, slip or move unexpectedly
toward you.
PRESSURIZED PUMP SYSTEMS
DANGER
Fluids under high pressure can
possess sufficient energy to cause
personal injury, death and/or
equipment damage either through
direct contact with escaping fluid
streams or by contact with loose
objects the pressurized fluid propels.
Operating a pump against a blocked or restricted
discharge line can produce excessive pressures in
the entire discharge system, which can damage or
burst discharge system components.
DANGER
Never operate a pump without a
properly sized pressure relief valve
located in the flowing discharge line
immediately adjacent to the pump
discharge connection.
The relief valve should be placed in the flowing
discharge line and not at the opposite end of the
discharge manifold in a dead end connection. The
dead end may become clogged with solid material
carried in the fluid, which could prevent proper relief
valve operation.
DANGER
Never place a shut-off valve or any
other component between the pump
discharge connection and the pressure
relief valve.
Make sure the pressure relief valve is installed so any
pressurized relief discharge from the valve is directed
away from possible contact with people or equipment.
The relief valve must be set to relieve at a pressure
equal to or below the maximum pressure values
shown on the pump data plate. However, if a
component is used in the discharge system with a
lower rated pressure capability than that listed on the
pump data plate, the pressure relief valve must be set
to relief valve must be set to relieve at a pressure
equal to or below the rated capability of the lowest
rated component.
Before starting the pump every time, check to
insure:
•
The pressure relief valve is in good operating
condition and has been set to the proper relief
pressure.
•
Any pipe line used to direct pressurized relief flow to
another location, such as a collecting tank, is not
blocked.
•
The discharge system is not blocked and all the
discharge line valves are open.
Check all fluid end discharge system components
including pipe, connections, elbows, threads,
fasteners, hoses, etc., at least once every six
months to confirm their structural adequacy. With
time, wear, corrosion and fatigue can reduce the
strength of all components. Magnetic iron and steel
components should be checked with magnetic particle
or dye penetrate crack detection equipment.
Nonmagnetic materials should be checked for cracks
with dye penetrants. All metallic components should
also be visually checked during these inspections for
signs of corrosion. If a component shows evidence of
cracking or loss of material due to corrosion it must be
replaced with a new part.
Continually monitor suction and discharge hose
assemblies when the pump is operating for leakage,
kinking, abrasion, corrosion or any other signs of wear
or damage.