T31 SERIES
General Instructions
CLOSE COUPLED PUMPS
FLEXIBLE COUPLED PUMPS
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, re-
generative turbine pumps should operate
satisfactorily for many years. Because of
the high differential pressures expected
in a regenerative turbine pump, close
running clearances are used to reduce
internal losses. Abrasive particles, even
microscopic ones in high enough concen-
trations can open up the close clearances
between internal cavities. 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 ship-
ment, inspect the equipment for damage
or missing components. Check the ship-
ping manifest and report any damage or
shortage to the Transportation Compa-
ny’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 described in
1A, recrated and stored in a dry loca-
tion. Standard shipping containers are
not suitable for outdoor 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 in-
hibitor solution, some of which will remain
inside the pump upon receipt. If units are
fl ushed out prior to storage, this inhibitor
will be removed and proper care must
be taken to prevent product deterioration
from improper storage.
For storage beyond 30 days, a corrosion
inhibiting protective fl uid should be added
to the internal pump cavities. Fluids used
in the pump should be selected for com-
patibility with pump materials. This is very
important when optional seal and gasket
materials have been used. Protective
caps on the inlet and outlets should also
be used. Caps alone are not suffi cient
protection.
1C Placing Stored Pumps Into
Service
Special care must be taken when placing
stored pumps into service. First clean
the outside and fl ush out the inside with
a process compatible fl uid. 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, fi ll the pump
with a process compatible fl uid and try
again in a few hours.
If this fails, loosen only the pump cover
thru bolts clamping the assembly togeth-
er, one full turn, no more. Fill the pump
with fl uid. 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
retightening the thru bolts to their original
positions.
If the unit still won’t turn over, DO NOT
apply further force. Refer to the Disas-
sembly/Reassembly Instructions 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 connecting the motor.
Note the correct rotation and wiring
diagrams on the assembly. Make sure
the motor rotation 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 judgement has been used in
selecting all the materials in the pump
for compatibility with process fl uids,
actual conditions sometimes vary from
original expectations. Also, typical
material selection charts do not consider
all the temperature, pressure, and fl uid
variables. The customer’s engineer
should be consulted for fi nal judgement
on the best materials for critical process
applications.
1D3 Valves
The fi rst valve to be considered for a re-
generative 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 ris-
ing along with a pressure increase) a
relief valve can be effectively used to
limit horsepower. This is helpful when
a non-overloading motor is specifi ed. It
can be of critical importance if the system
fl ow rate can vary widely. There are
almost no circumstances where a fl ow
modulating valve will work successfully in
a regenerative turbine pumping system.
The steep pumping characteristic, typical
of these pumps, produces very large
pressure changes with small variations
in fl ow rate. As a result, the modulat-
ing fl ow from the valve introduces sharp
pressure shock waves that shorten pump
life and may cause damage in other
pieces of equipment in the system.
If a shutoff valve is necessary in the
suction line, use a gate, ball, butterfl y,
or other full port valve. Globe or other
fl ow restricting valves can in some cases
reduce pump fl ow or increase chances of
cavitation.
A swing check valve is recommended
in the suction line even when the pump
inlet is only slightly higher than the fl uid
source. It should be the same size as the
pump inlet or sized based on reasonable
fl uid friction losses.
A foot valve is recommended when
lifting fl uid from a sump. This will save
wear and tear on any pump, even those
equipped with self priming equipment.
A Y-Strainer is recommended immedi-
ately ahead of the pump on any newly
constructed system. This is advisable
due to the probability that foreign material
large enough to damage pump clearanc-
es may remain even though the piping
has been fl ushed.
Valves in the outlet piping of a regenera-
tive turbine pump should always be open
1.
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