12
caught and thrown by the rotating parts when the pump is started.
Bolt the coupling guard securely into place, checking to assure that it
is not contacting any parts that will rotate when the pump is started.
OPERATING
WARNING:
Before starting the unit, see that all personnel are a safe distance
away from all possible hazards, that all sub-systems are connected
and operating, that all debris has been removed, that the shaft cou-
pling guard is securely in place, and that the pump is full of liquid.
Do not operate this pump at shut-off (no flow) as an explosion may
result. This can occur with any liquid, even “cold water”. Personal
injury, death, equipment damage, and/or loss of product
(pumpage) is likely to occur. If your system is operated where it is
possible for all outlets of the discharge from the pump to be closed
while the pump is still operating, a modification of the system needs
to be made to assure a continual flow of pumpage through the
pump. NOTE: Some people have a belief that a bypass line from the
discharge side of the pump to the suction side of the pump will
relieve this problem, this is “NOT TRUE”; DO NOT ATTEMPT THIS.
WARNING:
Do not operate a pump at a low flow condition, unless provision has
been made to prevent dangerous heat build up within the pump
casing. The liquid in the pump will heat up and this may result in
high pressure in the pump in a short time. Such pressure may result
in a rupture of the pressure-containing parts and cause severe haz-
ard to personnel and/or damage to the system.
A centrifugal pump should never be run without liquid In the casing.
Extensive damage may result, particularly to the mechanical seal or
compression packing. When the pump is equipped with a mechani-
cal seal, vent the pump seal chamber through the seal connection to
provide lubrica tion to the mechanical seal faces.
A centrifugal pump should be started with the suction valve open
and the discharge valve opened a slight amount.
As soon as the pump is up to speed, the discharge valve must be
opened slowly. A centrifugal pump cannot be operated with dis-
charge valve closed without heating up dangerously. During the first
several minutes of operating watch the pump carefully for overheat-
ing, vibration, and other abnormal conditions. If trouble develops,
stop pump at once and correct the problem.
These points must be checked after pump installation and before
starting up the pump.
1) Read instruction manual thoroughly and understand it.
2) Review pump order head sheet for the service rating of the
pump and any special features.
3) Check all piping connections making certain that they are both
tight and in the proper places. All piping includes seal, cooling,
or heating piping.
4) Make sure that the baseplate has been properly installed.
5) Check the electrical or steam line connections to the driver.
6) Break the coupling by removing the coupling spacer and bump
the motor starting button to check motor rotation. Operating the
pump in reverse rotation may cause extensive damage. If driver
rotation is correct, replace the coupling spacer. If not, connect
the wiring for proper rotation and recheck.
7) Check coupling for proper alignment. Realign if neces sary.
8) If pump seal chamber is packed, check to be sure that gland
stud nuts are pulled up only finger tight and that the gland is not
cocked.
9) Rotate the pump shaft by hand to be sure there is no
binding or rubbing within the pump or driver. Correct any diffi-
culties at once.
10) Check to see that the pump is properly lubricated.
11) Remove all dirt, waste, tools, and construction debris from the
area.
12) Check to see that the coupling guard is securely in place.
PUMP START UP CHECK LIST
To avoid prolonged down time and facilitate rapid repair of dam-
aged pump parts, Dean recommends that the pump user maintain a
minimum stock of spare parts. If the pump service is critical or the
pump parts are of special materials, spare parts stock is even more
important to the user. Such spares inventory may extend from a
spare mechanical seal or seal parts through complete casing back
cover-impeller-bear ing housing assemblies prepared for immediate
insertion in the pump casing. Consult your Dean representative who
will assist you in selecting your spares stock.
ORDERING SPARE PARTS
Spare part orders will be handled with a minimum delay if the fol-
lowing information is furnished by the customer with the order:
1) Give the pump serial number and size. These may be found on the
pump name plate. The serial number is also stamped on the suc-
tion flange or the top edge of the bearing housing front flange.
2) Give the part name, part number, and material of part. These
should agree with the standard parts list.
3) Give the quantity of each part required.
4) Give complete shipping instructions.
SPARE PARTS
To Next Page
Loading...
