Viking Pump TSM280: Duralobe (Discontinued) - Manual (Page 16)

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3.3 System Design.
3.3.1 System Design and Installation.
When incorporating any pump into a system it is considered good practice to
minimize piping runs and the number of pipe fittings (tees, unions, bends etc.)
and restrictions. Particular care should be taken in designing the suction line,
which should be as short and straight as possible with a minimum of pipe
fittings to minimize restricting product flow to the pump. The following should
be considered at the design stage of any system:
i) Be sure ample room is provided around the pump to allow for:
a) Access to the pump and drive for routine inspection and
maintenance, i.e. to replenish pump or drive lubricant or to
remove pump front cover and rotors.
b) Ventilation of the drive to prevent over heating.
ii) The pump must not be used to support piping. All piping to and from
the pump unit must be independently supported. Failure to observe
this may distort the pump head components or assembly and cause
serious consequential damage to the pump.
iii) Valves should be provided adjacent to the pump suction and discharge
connections to allow the pump to be isolated from the system for
routine inspection and maintenance.
iv) Rotary lobe pumps are of the positive displacement type and therefore
an overload protection device must be provided. This can take the form
of:
a) A pressure relief valve integral with the pump where available and
suited to the application, refer to section 3.8.
b) An in-line pressure relief system, i.e. external to the pump.
c) Incorporation of a torque limiting device in the drive system.
d) Rupture disc incorporated in the discharge piping.
Where pump rotation and hence flow is to be reversed during normal
operation, the overload device must be capable of protection for both
directions of rotation/flow. The Duralobe
® integral relief valves are described
in section 3.8 and are designed to operate under such conditions.
WARNING