Goulds Pumps 3910 11th ed. - IOM - Manual (Page 24)

5. Running a new or rebuilt pump at slow speeds may not
provide enough flow to adequately flush and cool the
wear ring and seal chamber cover bushing.
6. Pumpage temperatures in excess of 93° C (200° F) will
require warm-up of pump prior to operation. Circulate a
small amount of pumpage through the pump until the
casing temperature is within 56° C (100° F) of the
pumpage temperature and evenly heated.
NOTE: Warm-up rate should not exceed 1.4° C
(2.5° F) per minute.
STARTING PUMP
1. Make sure suction valve and any recirculation or
cooling lines are open.
2. Fully close or partially open discharge valve as
dictated by system conditions.
3. Start driver.
$
CAUTION
Immediately observe pressure gauges. If discharge
pressure is not quickly attained, stop driver, reprime,
and attempt to restart.
4. Slowly open discharge valve until the desired flow is
obtained.
$
! CAUTION
Observe pump for vibration levels, bearing tempera-
ture, and excessive noise. If normal levels are
exceeded, shut down and resolve.
OPERATION
GENERAL CONSIDERATIONS
$
CAUTION
Always vary capacity with regulating valve in the discharge
line. NEVER throttle flow from the suction side.
Driver may overload if the pumpage specific gravity
(density) is greater than originally assumed, or the
rated flow rate is exceeded.
Always operate the pump at or near the rated
conditions to prevent damage resulting from cavitation
or recirculation.
OPERATIONAL CHECKS
$
CAUTION
The following are minimum operational checks for the
pump only. Consult driver and auxiliary equipment
manufacturers’ literature for additional information.
1. On grease lubricated units, remove grease relief plugs
to verify that grease is present. Replace plugs.
2. On pure oil mist lubricated units, remove viewing port
plugs and assure oil mist is flowing properly. Replace
plugs.
3. Check bearing temperatures using a pyrometer or other
accurate temperature measuring device. Monitor
bearing temperature frequently during initial operation
to determine if a bearing problem exists as well as to
establish normal bearing operating temperature.
4. On units equipped with auxiliary piping, assure that
proper flows have been established and that equipment
is operating properly.
5. Establish baseline vibration readings to determine
normal running conditions. If it is determined that the
unit is running rough, consult factory.
6. Monitor all gauges to ensure pump is running at or
near rating and that suction screen (when used) is not
clogged.
OPERATING AT REDUCED
CAPACITY
s
! WARNING
Do NOT operate pump below minimum rated flows or
with discharge valve closed. These conditions may
create an explosive hazard due to vaporization of
pumpage and can quickly lead to pump failure and
physical injury.
24
3910-1
1th IOM 5/08