Watson-Marlow Bredel 265 - Manual (Page 26)

INSTALLATION
26
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
pipework to allow fluid isolation and drainage
from the pump during maintenance. Following
these recommendations will help minimize
process fluid exposure to maintenance
personnel.
•
Make sure that the maximum forces on the
flanges are not exceeded. The permissible
loads are given in the following table.
F2
F1
F3
Maximum permissible loads [lbf] on the pump
flange
Force Bredel 265 Bredel 280 Bredel 2100
F1 315 450 450
F2 67 90 90
F3 157 225 225