Flowserve CPXV fitted with Mark 3 ASME hydraulics - Manual (Page 13)

CPXV with Mark 3 ASME hydraulics ENGLISH 71569291 12-14
Page 13 of 44
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3.4.1 Operating limits
Maximum pump ambient temperature: +55 ºC (131 ºF)
where driver is also rated for this ambient.
Maximum pump speed: refer to the nameplate.
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
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 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 and checked as
detailed in section 4.5.5, Final checks.
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.
The sump pump mounting should have concrete or
metal to support it around its edges.
4.3.1 Levelling
The sole plate must be level so that the pump column
hangs vertically; confirmed by inspection. With the
motor removed check the top face of the machined
motor pedestal [3160] is set level to 0.05 mm (0.002 in.)
or 0.2 mm/m (0.0025 in./ft) maximum.
Larger size motors are shipped unfitted. The motor will
need to be fitted after completion of the pump
foundation installation. Turn shaft clockwise by hand to
ensure it is free to turn.