User Manual
8
of the pipeline stress, and that may affect the normal operation of the pump.
Therefore, no stress on the pump!
2) Check all the pipelines before connect, inside there is no impurity, and then
degrease clean the pipelines according to the pipeline cleaning procedure. Before
the pump body finally installed into the vacuum tank in the process of installation,
also need to carefully check cleaning of the pump body, where inside of the cylinder
and the all the visible inner/outer surface. Purge and clean after properly clean, to
ensure that the working fluid supplied to pump without mechanical impurities.
3) The inlet pipe should be as short as possible, must use vacuum tube to reduce heat
loss if the inlet pipe is more than 3 meters.
4) Reduce the account of tee, valve and elbow as far as possible where at the inlet pipe,
in order to reduce the pressure loss of the inlet pipe. Must install the necessary
pressure gauge, vent valve, filter, vent pipe, etc. Vent pipe must be draw from the
upper part of the pump tank, to ensure the discharge gas successfully from the main
pipeline.
5) Add a draft tube to the liquid discharge port, vent valve and safety valve discharge,
to lead liquid or gas to the security discharge position, draft tube’s diameter should
not be less than 15mm.
8. INLET PRESSURE AND NPSH
Net positive pressure required (liquid height representation) during the pump runtime should
be greater than liquid vapor pressure of the pump inlet, even if the inlet pressure is very high,
the NPSH value will still not enough. NPSH is only the difference value between the actual
liquid pressure and the liquid vapor pressure.
9. DIRECTION OF ROTATION
Check the rotation direction of pump after pre-cooling. If the pressure does not rise normally
after the pump power-on within 5 seconds, cut off the power supply, restart the pump after
exchange the direction of rotation.
The special rolling bearing and motor shaft, which are used for support pump, will be cooled
down and lubricated by the liquid flow through inside the pump, so no longer need any other
form of lubrication.
Technical operators on site must ensure that pump had been submerged in the liquid
absolutely before run the pump, thus guarantee the upper shaft lubrication.
WARNING!
In order to prevent damage to the shaft, the pumped liquid must be clean and