Flowserve DMX - Manual (Page 32)

DMX/DMXD/DMXH/DMXDH USER INSTRUCTIONS ENGLISH 85392728 - 10/09
Page 32 of 60
The unit must not be operated unless
coupling guard is bolted in place. Failure to
observe this could result in injury to operating
personnel.
When pump is equipped with manifolded
vent and drain lines, each line must be equipped
with an individual valve to prevent any liquid from
a high pressure line flowing into a low pressure
line. These valves must be kept in the closed
position during pump operation.
Observe extreme caution when venting
and/or draining hazardous liquids. Wear
protective clothing in the presence of caustic,
corrosive, volatile, flammable, or hot liquids. Do
not breathe toxic vapors. Do not allow sparking,
flames, or hot surfacing in vicinity of the
equipment.
The pump should not be operated
outside of the design speed range.
a) Never operate the pump with suction valve
closed.
b) Never operate pump unless it is filled with liquid
and vented.
c) Never operate the pump unless a liquid source is
available.
d) Never operate the pump without proper
lubrication.
5.8.1
Operating checks
In the interest of operator safety, the
unit must not be operated above or below the
nameplate conditions. Such operation could result in
unit failure causing injury to operating personnel.
Operation at low flows results in pump
power heating the liquid. A bypass may be required
to prevent vaporization and subsequent pump
damage. Mechanical damage may result from
continuous operation at flows less than the minimum
flow specified in the section 10.4 Customer Data
Sheet.
Immediately after start-up, and frequently during
running, check the following:
a) Check suction and discharge pressure gauges.
b) Check pressure gauges on each side of suction
strainer.
c) Check for excessive leakage.
d) Check for unusual noises.
e) Check lubrication system.
f) Check for adequate flow of cooling liquids.
g) After unit has been operated a sufficient length of
time to reach normal operating temperature and
condition, the unit is to be shut down and a
“HOT” coupling alignment check must be made.
(Refer to shaft /coupling alignment procedure).
Operation of the unit without appropriate
lubrication can result in overheating of the
bearings, bearing failures, pump seizures and
actual breakdown of the equipment, exposing
operating personnel to injury.
5.9 Stopping and shutdown
If motor driven, de-energize driver circuit. If turbine
driven, stop turbine-driven pumps by manually
tripping the overspeed trip.
If pump stops abruptly when driver is shut
down, investigate for pump binding. Take necessary
remedial action before restarting pump.
If pump is subjected to freezing
temperatures, the pump must be drained of liquid to
prevent damage to pump.
a) Close the pump suction and discharge valve.
b) Close valve in bypass line.
c) Drain the pump.
d) Turn off the auxiliary oil pump and cooling liquid
when supplied.
5.10 Hydraulic, mechanical and electrical
duty
These pumps are furnished for a particular service
condition. Changes in the operating system design
may affect the pump’s performance adversely. This is