5 Assembly and installation
20
CVP High-Pressure Centrifugal Pump
5.3 Pipelines
Determine the nominal widths of the pipelines,
taking the local conditions into account. To
keep flow losses to a minimum, avoid sudden
constrictions and sharp bends. Route pipelines
free of tension and pressure tight. Install them
in a way that prevents forces and torques be-
ing transferred to the pump. Never use the
pump as an anchor point for the pipeline.
Fit the suction pipe rising to the pump and the
inlet pipe declining to the pump, in order to
prevent the formation of air bubbles. Support
the pipes immediately before the pump, and
connect without tension. Ensure that the
weight of the pipes does not strain the pump. If
using short pipes, the nominal widths must be
at least equal to those of the pump connec-
tions. If using long pipelines, determine the
cost-effective nominal width on a case-by-case
basis.
Taper pieces to larger nominal widths should
have an extending angle of approx. 8° to pre-
vent increased pressure losses. Install check
valves and shut-off devices depending on the
type of system and pump (
à
Figure 8, pg 20).
Take appropriate measures to compensate
any expansions of the pipelines caused by
temperature influences, in order to avoid
straining the pump with forces and torques.
CAUTION
Before commissioning new systems, the
tanks, pipelines and connections must be
thoroughly cleaned, flushed and blown
through. Welding beads, scales and other
contaminations often only fall off after a
longer period of time. Ensure that they are
kept away from the pump by fitting a
strainer in the suction pipe.
Figure 8: Functional and operating elements
Key:
1
Centrifugal pump
2*
Foot valve with suction/inlet strainer
3*
Suction pipe
4*
Inlet pipe
5*
Shut-off valve
6*
Pressure gauge
7*
Delivery pipe
8*
Check valve
9*
Control fitting
10*
Pressure gauge
* not included in delivery
Summary of Contents for CVP 423
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