Section
E41•T41
Page 502
Dated
June 2016
97-4622-01-588
E41•T41 SERIES
HORIZONTAL CLOSE COUPLED PUMPS
VERTICAL FLANGE MOUNTED CLOSE COUPLED PUMPS
FLEXIBLE COUPLED PUMPS
1.
General Instructions
A.
Inspection of Equipment
B.
Storage
C.
Placing Stored Pumps Into
Service
D.
Application Considerations
E.
Recommended Spare Parts
When properly installed and given
reasonable care and maintenance,
regenerative turbine pumps should
operate satisfactorily for many years.
Because of the high differential pres-
sures expected in a regenerative
turbine pump, close running clear-
ances are used to reduce internal
losses. Abrasive particles, even
microscopic ones, in high enough
concentrations, can open up the
close clearances between internal
components. For critical services it
is recommended that you keep an
identical pump for stand-by use.
1A Inspection of Equipment
Immediately upon receipt of the
shipment, inspect the equipment for
damage or missing components.
Check the shipping manifest and
report any damage or shortage to
the Transportation Company’s local
agent. Inspect the crate and any
wrapping material before discarding.
Parts or accessories are sometimes
wrapped individually or fastened to
the skid.
Put the instructions that came with
the shipment in a safe place where
they will be available to those who
will be using them for installation and
service.
1B Storage
If the pump is to be stored before
use, it should be inspected as de-
scribed in 1A, re-crated and stored
in a dry location. Standard shipping
containers are not suitable for out-
door storage. In some areas, it may
be necessary to cover the pump’s
exterior surface with oil or other rust
inhibiting coating. All units are tested
at the factory with a water/corrosion
inhibitor solution, some of which will
remain inside the pump upon receipt.
If units are flushed out prior to stor
-
age, this inhibitor will be removed
and proper care must be taken to
prevent product deterioration from
improper storage.
For storage beyond 30 days, a corro-
sion inhibiting protective fluid should
be added to the internal pump cavi-
ties. Fluids used in the pump should
be selected for compatibility with
pump materials. This is very impor-
tant when optional seal and gasket
materials have been used. Protective
caps on the inlet and outlets should
also be used. Caps alone are not suf-
ficient protection.
1C Placing Stored Pumps Into
Service
Special care must be taken when
placing stored pumps into service.
First clean the outside and flush out
the inside with a process compatible
fluid. Try to turn the pump using the
coupling or shaft. On close coupled
units, access to the shaft is between
the pump and motor. A vise grip or
other plier type gripping device may
be used directly on the shaft. Apply-
ing torque to the motor fan blades
is not recommended. If the impeller
does not break loose immediately, fill
the pump with a process compatible
fluid and try again in a few hours.
If this fails, loosen only the pump cov-
er thru bolts clamping the assembly
together, one full turn, no more. Fill
the pump with fluid. Apply torque,
50 foot pounds maximum, to the
shaft. The pump should turn before
50 foot pounds is reached. If you
are successful at breaking loose the
unit, continue turning the pump while
re-tightening the thru bolts to their
original positions.
If the unit still won’t turn over, DO
NOT apply further force. Refer to the
Disassembly/Reassembly Instruc-
tions in Section 5 to determine the
cause of the problem.
1D Application Considerations
1D1 Electrical Wiring
All electrical equipment and wiring
should conform to local and National
Electrical Codes. Use the motor
manufacturer’s instructions for con-
necting the motor. Note the correct
rotation and wiring diagrams on the
assembly. Make sure the motor rota-
tion and speed matches that required
for the pump.
When making electrical
connections to motors provided with
threaded stud electrical terminals, the
recommended torque should be 13-16
inch-lbs. Applying torque in excess of
this range may cause damage.
1D2 Construction Materials
While it is reasonable to assume
that good judgment has been used
in selecting all the materials in the
pump for compatibility with process
fluids, actual conditions sometimes
vary from original specifications.
Also, typical material selection charts
do not consider all the temperature,
pressure, and fluid variables. The
customer’s engineer should be
consulted for final judgment on the
best materials for critical process
applications.
1D3 Valves
The first valve to be considered for a
regenerative turbine pumping system
might be a pressure relief valve.
Because this type of pump has a
horsepower requirement similar to
that of a positive displacement pump
(constantly rising hp along with pres-
sure increases) a relief valve can be
effectively used to limit horsepower.
This is helpful when a non-overload-
ing motor is specified. It can be
of critical importance if the system
flow rate can vary widely. There are
almost no circumstances where a
flow modulating valve will work suc
-
cessfully in a regenerative turbine
pumping system. The steep pump-
ing characteristic, typical of these
pumps, produces very large pressure
changes with small variations in flow
rate. As a result, the modulating flow
from the valve introduces sharp pres-
sure shock waves that shorten pump
life and may cause damage to other
pieces of equipment in the system.
A swing check valve is recommended
in the suction line even when the
pump inlet is only slightly higher than
