38 Flushed seal
before starting up the pump, connect the flushing hole in the seal area to the flushing liquid line with a pressure of at least 2 bar. Ensure
before starting the pump and during operation that there is a constant flow of flushing liquid in the seal. Flushing ensures that the liquid
will be diluted in the seal area to allow the seal to operate under the best possible conditions. When the pump is stopped, and will not be
restarted again for some days, empty the pump as described in paragraph 6 and wash it completely through the upper priming cover
(fig.9)
14.10 The seal overheats
The pump does not prime (see paragraphs 15.1 and 15.9)
14.11 The elastomer portions of the flexible coupling wear out quickly
Check that the pump is correctly aligned as described in paragraph 11
15 RESIDUAL RISKS
Residual risks are those which cannot be eliminated through the pump design:
- knocks
- anomalous pressure rises
- misuse
- manoeuvring errors in the vicinity of the pump
16 REPAIRS
Before carrying out repairs on the pump it is essential to:
- turn off the mains power (follow the directions in paragraph 14)
- close the gate valves on the suction and discharge sides of the pump
- if the pumped liquid is hot, wait until the pump has cooled down to ambient temperature
- if the pumped liquid is hazardous, follow the safety procedures for handling hazardous liquids
- empty the pump casing as described in paragraph 8
- remove and clean any residues of the pumped liquid
17 DISASSEMBLY
17.1 Removing the pump from the system
Carry out the instructions in paragraph 17
- remove the nuts of the suction and discharge flanges
- remove the bolts which fix the pump to the base plate
- slip the pump out of the flexible coupling (if fitted) or remove it from the electric motor
- before lifting the pump with appropriate lifting devices, check the weight of the pump
18 ASSEMBLY
18.1 Mounting the pump in the system
- lift the pump using suitable lifting devices
- position the pump on the base plate
- reconnect to the flexible coupling or electric motor
- check the alignment as described in paragraph 11
- fix the pump to the base plate
- connect the pump to the pipework
- remount any coupling guards fitted
19 SPARE PARTS
To ensure that the pump continues to operate well as time goes on, it is advisable, when ordering the pump, to acquire the spare parts
recommended for the first maintenance operation:
mechanical seal
impeller
wear plate
set of gaskets
check valve
self-locking impeller nut
19.1 Ordering spare parts
To order spare parts, specify the following:
- type of pump
- serial number of the pump
- reference number and description of the part as shown in the exploded drawing
20 DISPOSAL
- Do not abandon in the environment
- Metal parts can be recycled as scrap
- Grease and oil must be recovered and stored as prescribed by the relevant legislation for disposal by approved agencies
- Elastomer gaskets must be removed and disposed of in an approved waste disposal unit.
12
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