Dura 65
11 | Page
Version 1.0v-05/2021
© Verder International B.V
5.3 Planning the Pipes
5.3.1 Specifying Supports and Flange
Connections
1. When planning pipe runs take every possible
operating condition into account:
– Cold/warm medium
– Empty/full
– Unpressurized/pressurized
– Positional change of the flanges
2. Ensure that the pipe supports are designed to
accommodate any movement from environmental
or pressure imposed forces.
5.3.2 Specifying Nominal Diameters
Keep the flow resistance in the pipes as low as possi
-
ble. Pipe work immediately connected to both inlet and
outlet port of the pump should be straight runs for at
least 1 metre.
Ensure that nominal pipe diameter is at least 1.5 times
nominal pump-hose diameter to reduce pulsation.
5.3.3 Specifying Pipe Lengths
1. Keep pipe work as short and direct as possible.
2. To allow easy access when changing hoses, include
a short, removable section adjacent to the port
flanges.
5.3.4 Optimizing Cross-Section of Pipe
Work
1. Avoid bending radii of less than 10r (r - the radii of nominal
piping).
2. Avoid abrupt changes of cross-section along the piping.
5.3.5 Providing Safety and Control Devices
(recommended)
Making provisions for isolating and shutting off pipes
For maintenance and repair work.
u
Provide shut-off valves in the suction and discharge lines.
Allowing safe removal of product
u
Include drainage taps in suction and discharge lines at the
lowest point.
5.3.6 Solids Size
Large solids can potentially damage the pump, for a spe
-
cific solids size refer to (
g
Appendix A).
For solids larger than mentioned in the table, we advise
filtering before entering the pump
Do’s
Don’ts
1. Short pipe run to
suction side
Long pipe run to suction
side
2. Reduced Joints/Bends
Multiple Joints/Bends
3. Connecting pipe with
diameter 1.5 times pump
hose diameter
Pipe ID 1.5 times hose ID
Connecting pipe with
smaller than pump hose
diameter
Pipe ID < pump hose ID
4. Pulsation damper
connected close
to the pump
Pulsation Damper
Bellows
Pulsation damper
connected away from
pump
10% loss in damper efficiency
for every meter
Table 4 Do’s and Don’ts
