Pentax HP Manual Del Usuario página 57

5. WORKING AND USAGE
SEAL
- Mechanical seal (Fig. 34).
During the early stages of running, there might be a slight leak from the
mating faces of the seal while it is bedding in.
If any leak persists it should be investigated, as the mechanical seal has
a con- trolled axial load which cannot be adjusted.
- Gland packing seal (Fig.35)
To ensure correct operation and long life, the gland packing seal nut
should be adjusted correctly.
ATTENTION!
All adjustments must be made when the pump is stationary.
The gland packing seal nuts should be adjusted so that there is a slight
leak from each seal.
This will ensure that the rope seal surfaces are lubricated and
cooled.
The leakage rate from each gland packing, is a function of pump size and
pack- ing box pressure.
Before the first start, back off gland nuts slightly to ensure that the leakage
rate is high. When the pump has reached it's rated speed, re-tighten the
gland nuts to reduce the leakage rate to give a slight, but continuous leak.
Periodically, check the leakage rate from the gland seals and adjust if neces-
sary.
Replace gland packings when the leakage rate is too high and all adjustments
is taken up.
MOTOR INPUT POWER
When the pump is running at full flow condition, ie, end of curve perform-
ance, the electric motor current drain and power must not exceed the values
stated on the label.
MIN.FLOW
ATTENTION!
Long term operation of a pump with a closed outlet valve, ie, zero flow will
cause overheating and result in pump damage.
The minimum acceptable flow for our range of pumps, is 20% of the flow at
maximum efficiency.
Gland packing seal
OK
22
Mechanical seal
Fig.34
Gland packing
?