Commissioning And Operation; Commissioning - Andritz SD 39 Série Instructions De Service

Series SD 39
3.4.2 Suction Pipe
• The maximum flow rate is 2 m/s (when pumping the maxi-
mum capacity).
• Do not fit a row of quarter bends on different levels.
• The pipe should be laid at an inclined angle to the pump (at
least 1 %).
• The pipework must be completely vented and sealed.
• Provide a separate suction pipe for each pump.
• When operating the pump in suction mode without a foot
valve, provide a vacuum installation.
• Ensure that air pockets are not formed in the suction pipe.
• Minimum submergence (1):
Hm = v²/2g+0.1
Hm = minimum submergence
v = flow rate when pumping maximum capacity
g = local gravitational constant = 9.81 m/s²
• The distance from the floor of the container (2) must be at
least half the diameter of the pipe.
3.4.3 Inlet pipe
22
suction pipe
Instructions for laying the suction branch
• Should be laid as the suction pipe but with the pipe at an an-
gle sloping away from the pump (at least 1 %).
• Fit a return flow stop before the pump.
3.4.4 Discharge pipe
• Lay piping at an angle sloping upwards.
• Maximum flow rate 2.5 m/s (note the fall in meters).
• Ensure that the piping is free of tight spots.
• The pipes must be laid so that the danger of deposits blocking
other pumps is avoided.
• Flange and piping must be designed in accordance with the
maximum pressure.
• Avoid air pockets and vent high points if necessary.
• Differing pipe diameters cause variations in flow rate and
therefore need to be avoided.
• Install a sluice valve and return flow stop in order to prevent
pressure surges at a sudden stop of pump set (for example,
if the set experiences a sudden power loss).
3.4.5 Pressure tests
• Observe the relevant directives.
• Adhere to permitted nominal pressure levels for individual
components.
3.4.6 Auxiliary pipe connections
Sealing and flushing media:
• Connect the pipes.
• Install a regulating valve and a magnet valve (closed without
current).
• Blocking and flushing pressure must be at least 0.5 bar above
the maximum pressure of the pump.
• Set the amounts of blocking and flushing media with the reg-
ulating valve.
Quench media:
• Discharge media without pressure into the quench chamber.
• When using pumps which are fitted with a dual-action me-
chanical seal in tandem arrangement then fit the quench con-
tainer approx. 1.5 m above the mechanical seal.

4. Commissioning and operation

4.1

Commissioning

Before switching on the pump ensure that the following points
have been checked and carried out:
• Check the alignment between pump and motor when operat-
ing horizontal pumps with flexible coupling (see para. 3.3.2).
• Check that the fastening bolts of pump and motor are secure.
• Check that the installation of the pump ensures easy access
to the functional controls.
4.1.1 Bearings
4.1.1.1 Grease lubrication
See para. 5.2.1.1.
4.1.1.2 Oil lubrication
• Delivery with filled bearing housing: Check that the oil level
(1) reaches the middle of the oil level display glass (2). Re-
move the vent stops (3) if required and top up with oil before
inlet pipe
replacing them.