Watson-Marlow APEX10 - Manual (Page 18)

DESCRIPTION
18
4.4 Pump hose
4.4.1 General
A Extruded outer layer made of natural rubber
B Two nylon reinforcement layers
C Extruded inner liner
The pump hose liner material should be chemically
resistant to the product being pumped. For each pump
model various hose types are available. Choose the
most appropriate for your application.
The material of the inner liner of the pump hose
determines the hose type. Each hose type is marked by
a unique colour code.
Bredel pump hoses have been carefully machined to
achieve minimum tolerances in wall thickness. It is very
important to guarantee the correct compression of the
pump hose, because:
•
When the compression is too high, it creates an
excessive load on the pump and pump hose,
which may reduce the life of the pump hose and
bearings.
•
When the compression is too low, it cuts
capacity and causes backflow. Backflow
reduces the life of the pump hose.
B C
A
Hose type Material Colour code
NR Natural rubber Purple
NBR Nitrile rubber Yellow
F-NBR Nitrile rubber Yellow
EPDM EPDM Red
CSM CSM Blue
Consult your Bredel representative for
more detailed information about the
chemical and temperature resistance of
pump hoses.