General Pump LH - Manual (Page 6)

GENERAL PUMP
A member of the Interpump Group
LH SERIES
Page 6
7. GENERAL INFORMATION ABOUT PUMP
USE
The LH pump has been designed to pump fresh filtered
water at room temperature. LHZ and LHN special stainless
steel versions are also available for critical fluids.
7.1 Water temperature
Water temperature is critical for the pump life, the higher it
is, the more likely it is to create cavitation, resulting in
premature seal and valve failures.
Below is the temperature chart
and relevant limitations:
<104oF
Water is considered to be at room
temperature.
from
104oF
to
140oF
feed the plunger pump with a centrifugal
pump supplying at least twice the plunger
pump volume at 30 to 45 PSI
reduce pump rated RPM by 30% to 50%
Make sure the crankshaft turns as
indicated by the arrows located neat the
drive shaft projection
>140oF
standard pump not suitable, contact our
Customer service Department
7.2 Max flow and pressure ratings
The performance data indicated in the catalog and on the
rating plate refer to the maximum performance of the
pump. The use of the pump below the rated performances
does not allow the drop in power absorbed to be balanced
by altering the pressure or volume of the pump above its
maximum value.
7.3 Lowest operating RPM
The lowest operating speed of the crankshaft for all
LH’s (all versions) is 350 RPM
8. CONNECTIONS AND PLUGS
LH pumps are provided with (Fig. 3):
1 - 2 inlet ports IN Ø 3”.
Suction line connection to any of the two inlet ports
is acceptable, the port not being used should be
sealed with the correct plug.
2 - 2 outlet ports OUT Ø 1.4”.
3 - 1 hole DRAIN provided underneath the crankcase
and designed to drain out the water leakage of the
pressure packings. This hole must always be left
open (see paragraph 10.3, Fig 7, page 9).