Flowserve HED Worthington - Manual (Page 33)

HED/HED-DS USER INSTRUCTIONS ENGLISH 85392695 – 06/14
Page 33 of 64
5.8 Normal Start Up
The starting procedure to be followed for normal start
up is the same as that for initial starting with the
exception that Step (i) section 5.6 "CHECK
ROTATION" does not have to be repeated as long as
driver systems have not been changed since last
pump operation.
5.9 Stopping the pump
a) Shut down driver.
The pump should be shut
down rapidly to protect the internal wearing
parts which are lubricated by the liquid being
pumped.
If pump stops abruptly when driver is
shut down, investigate for pump binding. Take
necessary remedial action before restarting
pump.
b) Close the pump discharge valve, while the
suction valve normally remains open.
c) Close valve in bypass line and closed whenever
possible, switch off flushing and/or cooling liquid
supplies.
d) If pump is subjected to freezing
temperatures the pump must be drained of
liquid to prevent damage to the pump. For
pumping hot liquid or fluid subject to
crystallize, the flush supply must be
maintained on completion of pumping, to
avoid seals damage.
In some installations the use of a check
valve is not feasible due to the creation of pressure
surges or water hammer as a result of the sudden
closing of the valve under high discharge pressure. In
such cases the discharge valve should be closed
slowly prior to stopping the driver to eliminate the
possibility of water hammer.
5.10 Hydraulic, mechanical and
electrical duty
This product has been supplied to meet the
performance specifications of your purchase order,
however it is understood that during the life of the
product these may change. The notes on section 3.4
may help the user decide how to evaluate the
implications of any change. If in doubt contact your
nearest Flowserve office.
6 MAINTENANCE
6.1 General
It is the plant operator's responsibility to ensure
that all maintenance, inspection and assembly work
is carried out by authorized and qualified personnel
who have adequately familiarized themselves with
the subject matter by studying this manual in detail.
(See also section 1.6)
Oil and grease leaks may make the ground
slippery. Machine maintenance must always
begin and finish by cleaning the ground and the
exterior of the machine.
If platforms, stairs and guard rails are required for
maintenance, they must be placed for easy access to
areas where maintenance and inspection are to be
carried out. The positioning of these accessories
must not limit access or hinder the lifting of the part to
be serviced.
When air or compressed inert gas is used in the
maintenance process, the operator and anyone in the
vicinity must be careful and have the appropriate
protection.
Do not spray air or compressed inert gas on skin.
Do not direct an air or gas jet towards other people.
Never use air or compressed inert gas to clean
clothes.
Before working on the pump, take measures to
prevent an uncontrolled start. Put a warning board on
the starting device with the words: "Machine under
repair: do not start".
With electric drive equipment, lock the main switch
open and withdraw any fuses. Put a warning board
on the fuse box or main switch with the words:
"Machine under repair: do not connect".
Before attempting any inspection or
repair on the pump, the driver controls must be in the
"off" position, locked and tagged to prevent injury to
personnel performing service on the pump.
Before attempting to disassemble pump, pump
must be isolated from system, by closing suction and
discharge system valves, drained of liquid and
cooled, if pump is handling hot liquid.