V1.4 5 of 22 04/01/2009
When handling high viscosity liquids, the speed of the pump must be reduced and the
size of the lines increased to prevent cavitation.
Note: Pipeline friction increases at a rapid rate with an increase in viscosity. For a given
pump and motor, larger pipelines are necessary to maintain the same pump pressure
when changing from a thin fluid to a thick one.
Most Tuthill C Series pumps are supplied with both ports on the same plane. Pumps with
this type of porting arrangement should always be installed with the ports facing upward
to insure proper priming. If it is necessary to install the pump with the ports pointing to
either side, it is recommended that the top port be the suction port. This will prevent
gravity-induced drainage of fluid through the suction port. When pipes are installed, an
inverted "U" bend should be incorporated into the suction line close to the pump for
priming purposes.
Viewing the pump from the shaft end, the inlet port is on the right for clockwise rotation
and on the left for counter-clockwise rotation. On pumps with built in relief valves, the
adjusting screw of the valve must always be located on the suction side of the pump.
Pumps should be filled with oil at installation and should never be allowed to run dry.
Every pump installation should have a good foundation. Its structure should be
sufficiently strong to hold the pump rigid and to absorb any strain or shock that may be
encountered. The installation should be leveled, checked for proper piping alignment,
and then fastened securely.
Method of Drive
Direct drive through a traditional flexible coupling is recommended. (CC pumps are direct
driven by the motor shaft as an integral part of the pump.) However, do not expect the
flexible coupling to compensate for misalignment. Contact the coupling manufacturer to
determine the maximum amount of misalignment to which the coupling can be subjected.
Model AC, C1B and CC pumps can be driven in either direction of rotation, unless
outfitted with an internal relief valve. All other C Series pumps are directional. Rotation
must be specified at the time of order. The seal chamber communicates with the neutral
zone and therefore the seal/packing is subjected to approximately one half of the
discharge pressure.
All pump and motor units must be properly aligned during assembly and periodically
checked since misalignment may occur later due to abuse or other conditions. Pipe
strain can force the pump and motor shafts out of alignment. Therefore, all piping to the
pump must be properly supported. Do not allow the pump to act as a pipe support.
Provide for proper expansion of pipes when handling hot liquids. Allow pump to reach
operating temperature slowly. Rapid temperature change can result in damage to the
cast iron components.
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