Watson-Marlow Bredel 265 - Manual (Page 24)

INSTALLATION
24
•
For the flexible hoses select compatible
materials and ensure the installation is suited
for the design pressure of the system.
•
Keep the delivery and suction lines as short and
direct as possible.
•
Prevent any possibilities of exceeding the
maximum working pressure of the hose pump.
Refer to §
11.1.1 . If necessary fit a pressure
relief valve.
•
Consult your Bredel representative for
recommendations on mounting pulsation
dampening devices. A pulsation dampener and/
or inlet pulse accumulator may be necessary if
the relative density and and pump speed is high
and the line lengths are long.
•
The self-priming and positive displacement
nature of peristaltic pumps means that valves
are not required. If for whatever reason valves
are fitted into the system, they must have a
straight fluid path and cause minimum
restriction to flow in the pumping circuit. Note
that the presence of check valves directly in the
process stream may increase pulsation and
negatively impact hose life.
•
For the ease of hose changing and some
pulsation suppression, it is recommended to
use a segment of flexible hose between the
pump flange and hard piping of the suction and/
or discharge line. A segment of three quarters
(3/4) of the pump hose length for the flexible
pipe work is recommended. Bredel also
recommends installing an isolation valve and
pipe-drain in the suction and discharge
CAUTION
Consider the maximum permissible work-
ing pressure on the discharge side.
Exceeding the maximum working pressure
may lead to serious damage to the pump.