Watson-Marlow Bredel 265 - Manual (Page 35)

OPERATION
35
7.4 Hose failure
The hose in a peristaltic pump has to withstand many
load cycles of considerable magnitude. The repetitive
stress cycles will deteriorate the hose and will
eventually cause hose failure. The hose life strongly
depends on the operating condition, process fluid and
hose material. The end-user should be aware of this
and accept the need for regular hose replacement.
A hose failure will result in direct contact between the
pump lubricant and the pumped medium. In general,
this will not cause a hazardous situation as the Bredel
Genuine Hose Lubricant is harmless (FDA approved),
but it will result in additional downtime since the pump
needs to be cleaned prior to new hose installation.
These consequences can be avoided by preventive
hose replacement. The moment for preventive
maintenance depends on the particular application and
use of the hose. The end-user needs to find out the
moment for preventive maintenance.
7.5 Fluid leakage
The Bredel pump series uses lubricated shoes to
compress the hose. This means the pumphead must be
filled with a sufficient amount of lubricant during
operation. This lubricant is contained in the pump
WARNING
Exceptions to this general rule are when
the pumped product is either a strong oxi-
dizer or a strong acid. These products
should be avoided as they can cause
unwanted chemical reactions with the
Bredel Genuine Hose Lubricant and a
hazardous situation may arise. In such
cases an alternative lubricant should be
used. Contact your Bredel representative
for more details.