Flowserve Durco Mark 3 ISO Frame Mounted - Manual (Page 13)

DURCO MARK 3 ISO FRAME MOUNTED ENGLISH 85392719 12-14
Page 13 of 52
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3.4.2 Energy efficiency operation of pumps
The pump supplied will have been selected from
Flowserve’s extensive product line to have optimum
efficiency for the application. If supplied with an electric
motor then the motor will meet or exceed current
legislation for motor efficiency. However it is the way
the pump is operated which has the greatest impact on
the amount and cost of energy used during the
operating life of the pump. The following are key points
in achieving minimum operating cost for the equipment:

Design the pipe system for minimum friction losses

Ensure that the control system switches off the
pump when not required

In a multi-pump system run the minimum number
of pumps

Try to avoid systems which by-pass excess flow

As far as possible avoid controlling pump flow by
using throttle valves

When commissioned, check that the pump
operates at the duty specified to Flowserve

If it has been found that the pump head and flow
exceed that required, trim the pump impeller
diameter

Ensure that the pump is operating with sufficient
NPSH available

Use variable speed drives for systems that
require variable flow. A VFD for an induction
motor is a particularly effective way of achieving
speed variation and energy/cost reduction

Notes for VFD usage:
o make sure that the motor is compatible with
VFD
o Do not over-speed the pump without
checking the power capability with Flowserve
o On systems with high static head, speed
reduction is limited. Avoid running the pump
at a speed which gives low or zero flow
o Do not run a low speed and flow rate that lets
solids settle out of suspension in the pipework
o Do not use a VFD for a fixed flow requirement;
it will introduce power losses

Select high efficiency motors

If replacing a standard motor with a high
efficiency motor it will run faster and the pump
could take more power. Reduce the impeller
diameter to achieve energy reduction

If the pump system pipework or equipment is
changed or process duty is changed, check that
the pump is still correctly sized

Periodically check that the pipe system has not
become corroded or blocked

Periodically check that the pump is operating at
the flow, head and power expected and that the
efficiency has not reduced with erosion or
corrosion damage
4 INSTALLATION
Equipment operated in hazardous locations
must comply with the relevant explosion protection
regulations. See section 1.6.4, Products used in
potentially explosive atmospheres.
4.1 Location
The pump should be located to allow room for access,
ventilation, maintenance and inspection with ample
headroom for lifting and should be as close as
practicable to the supply of liquid to be pumped. Refer
to the general arrangement drawing for the pump set.
4.2 Part assemblies
On baseplated pump sets the coupling elements are
supplied loose. It is the responsibility of the installer
to ensure that the pump set is finally lined up as
detailed in section 4.5.2, Alignment methods.
4.3 Foundation
There are many methods of installing
pump units to their foundations. The correct method
depends on the size of the pump unit, its location and
noise and vibration limitations. Non-compliance with
the provision of correct foundation and installation
may lead to failure of the pump and, as such, would
be outside the terms of the warranty.
Ensure the following are met:
a) The baseplate should be mounted onto a firm
foundation, either an appropriate thickness of
quality concrete or sturdy steel framework. (It
should NOT be distorted or pulled down onto the
surface of the foundation, but should be
supported to maintain the original alignment.)
b) Install the baseplate onto packing pieces evenly
spaced and adjacent to foundation bolts.
c) Level with shims between baseplate and packing
pieces.