SECTION 6
LOW PRESSURE WATER
May 2003
6-2
05148390c
• High temperature at the booster pump outlet (switch (2).
• If the motor does not run for 2 minutes, the solenoid valve (11) will
shut off. To re-open the valve, press F6.
Note that pressure gages for T series KMT Waterjet pumps are installed
in a frame leg for easy access. Pressure gages provide a qualitative
measure of LP water system performance, while pressure switches on the
T&Q series pumps provide automatic shutdown protection against out of
tolerance conditions.
6.2.1 Normal Operating Condition
During normal operation, the low pressure water system maintains the
following conditions:
• Filter pressure drop (gage reading 4 minus 6) not more than 1 bar (15
psi)
• Booster pump inlet pressure greater than 2 bar (30 psi), (T and Q
series).
• Booster pump discharge pressure gage reading 8.0-8.3 bar (115-120
psi)
• Intensifier LP cutting water supply pressure greater than 4 bar (60
psi), (T and Q series).
• Water at booster pump outlet maintained at less than 128 deg-F.
NOTE
While the intensifier assembly reverses direction, the booster pressure
will fluctuate slightly above and below the normal setting. Pressure
fluctuation greater than 2 bar (30 psi) may indicate inadequate water
supply to unit, or poor booster pump performance.
6.2.2 Operation
The cutting water enters the pump through port “B”. When the
CONTROL POWER-- ON button on the operator control panel is
activated, solenoid valve (11) opens allowing water to flow through filter
assembly (5), then to the inlet of the booster pump (1). The booster
pump increases cutting water supply pressure to 8 bar (120 psi) to
assure proper supply to both intensifier inlet check valves (13).
Pressurized water from the booster pump is supplied to manifold (18).
From this manifold, cutting water is routed to the inlet check valves (13)
of the intensifier. Note that if a redundant intensifier is installed, the
inlet cutting water must be manually disconnected from the inactive
intensifier, then connected to the inlet check valves of the inactive
intensifier.
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