Omega
10
The intersections of NPSH
required
and NPSH
available
are pro-
jected onto the H--Q characteristic, where they indicate the ope-
rating limits (refer to the diagram below). Checking of the
NPSH --related operating limit is not necessary for operating the
pump under design conditions. If system-- related changes oc-
cur, an NPSH check must be carried out. If necessary, consult
the nearest after--sales service c entre.
Q
min
NPSH
required
NPSH
available
6.4.4 Shutdown
Close the shut--off element in the discharge line. If the di-
scharge line is equipped with a check valve, the shut--off ele -
ment may remain open, provided there is back pressure in the
line.
The shut--off element in the suction line must not be clo-
sed when switching off the pump. Switch off the motor,
making sure that the unit runs smoothly down to a standstill.
Depending on the system the pump shall have an adequate af-
ter-- run period -- with the heat source switched off -- to allow the
medium handled to cool down sufficiently to avoid any heat
build--up within the pump.
In the case of prolonged shutdown, the shut--off element in the
suction line has to be closed.
Close the auxiliary connections.
In the event of frost and / or prolonged shutdowns, the pump
must be drained or otherwise protected against freezing.
6.5 Shutdown / Storage / Preservation
Each KSB pump leaves the factory carefully assembled. If com-
missioning is to take place some time after delivery, we recom-
mend that the following measures be taken for pump storage.
6.5.1 Storage of New Pumps
· New pumps are supplied by our factory duly prepared for
storage.
Maximum protection for up to 12 months, if the pump is pro-
perly stored indoors.
· Store the pump in a dry location.
6.5.2 Measures to be Taken for Prolonged Shutdown
1. The pump remains installed; periodic check of opera-
tion
In order to make sure that the pump is always ready for instant
start--up and to prevent the formation of deposits within the
pump and the pump intake area, start up the pump set regularly
once a month or once every 3 month for a short time (approx.
5 minutes) during prolonged shutdown periods. Prior to an ope-
ration check run ensure that there is sufficient liquid available
for operating the pump.
2. The pump is removed from the pipe and stored
Before putting the pump into storage carry out all checks speci -
fied in sections 7.1 to 7.4. Then apply appropriate preservati-
ves:
· Spray--coat the inside wall of the pump c asing, and in p arti-
cular the impeller clearance areas, with a preservative.
Spray the preservative through the suction and discharge
nozzles. It is advisable to c lose the nozzles (for ex. with pla -
stic caps or similar).
6.6 Returning to Service after Storage
Before returning the pump to service carry out all checks and
maintenance work specified in sections 5.1 and 5.2.
In addition, the instructions laid down in section 6.1
”Commissioning” and section 6.4.3 ”Operating limits”
must be observed.
Upon completion of the work, all safety--related and pro-
tective equipment must be properly refitted and / or re-
activated before starting the pump set.
7 Maintenance / Repair
7.1 General Instructions
The operator is responsible for ensuring that all maintenance,
inspection and installation work is carried out by authorized,
duly qualified staff who are thouroughly familiar with these ope-
rating instructions.
A regular maintenance schedule will help avoid expensive re -
pairs and contribute to trouble--free, reliable operation of the
pump with a minimum of maintenance expenditure and work.
Work on the pump and the motor must only be car-
ried out with the e lectrical connections disconnec-
ted. Make sure that the pump set cannot be switched on ac-
cidentally (danger of life!).
Pumps handling liquids posing health hazards must be
decontaminated. When draining the medium see to it
that there is no risk to persons or the environment. All relevant
laws must be adhered to (danger of life!).
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