KSB CHTRa, Инструкция по установке и эксплуатации

Страница: 60 / 116

6 Commissioning/Start-up/Shutdown
60 of 116
CHTRa
CAUTION
Off-design operating data
Damage to the pump set by cavitation!
▷
The minimum discharge head of 150 m must not be underrun, except in the
start-up and stopping phase.
▷
The minimum speed of n = 1000 min
-1
may only be underrun in the start-up and
stopping phase.
▷ The minimum speed (< 5 s) must be reached quickly.
NOTE
Should warning signals or problems occur during starting or trial run, proceed as
described in the chapter "Trouble-shooting"
6.3.3.1 Pump set with electric motor
1. Switch the drive on as described in the manufacturer’s product literature.
2. For pump set with variable speed coupling:
- The motor is running; due to the scoop tube position, the pump is operating at
a minimum speed of n = 1000 rpm or a minimum head of H
min
= 150 m.
- Switch on the cooling water (if applicable).
- Adjust the pump to minimum flow by changing the scoop tube position.
3. Check the temperature and smooth running of the bearings. Observe the
information given in "Interlock criteria for rolling element and plain bearings
and permissible vibrations at the bearing housings".
4. Check the pump pressures and differential pressures.
5. Monitor the minimum flow valve to make sure it works (hydrodynamic noise).
6. Check the mechanical seal. Mechanical seals must not drip.
7. Slowly open the shut-off valve of the discharge line until it is completely open.
When starting against an open shut-off valve in the discharge line, consider the
higher power input required.
8. Continuously monitor the pump set’s operating behaviour.
9. For mechanical seals with circulation cooling:
- If a magnetic separator is available, check whether the temperature of the
circulation liquid remains constant after its commissioning/start-up.
- If a continuous venting system is not available, vent the mechanical seal circuit.
6.3.3.2 Turbine-driven pump set
CAUTION
Blocking of rotor
Damage to the rotor!
▷ In the event of a turning gear failure and pump standstill (n = 0 rpm), the pump
has to cool down until the pump casing temperature is ≤ 60
℃ before it is
returned to service.
1. If a pump is primed with a fluid which has a temperature greater than 60° C, let
the pump casing cool down to 60° C.
2. Switch on the turning gear, if any, and observe the turbine manufacturer’s
instructions on starting of the pump set.
3. If pre-warming is provided, open the valve in the pre-warming line.
4. Switch on the cooling water (if applicable).