Watson-Marlow DuCoNite 25 - Manual (Page 18)

DESCRIPTION
18
4.4 Pump hose
4.4.1 General
A: Outer extruded layer made of natural rubber
B: Four nylon reinforcement layers
C: Inner extruded liner
The pump hose liner material should be chemically
resistant with the product to be pumped. Dependent on
the specific requirements of your application a
corresponding pump hose must be selected. For each
pump model various hose types are available.
The material of the inner liner of the pump hose
determines the hose type. Each hose type is marked by
a unique colour code.
The Bredel pump hoses have been carefully machined,
therefore there are 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 a
too high load of the pump and pump hose,
which may result in a reduction of the life of the
pump hose and bearings.
Hose type Material Colour code
NR Natural rubber Purple
NBR Nitrile rubber Yellow
EPDM EPDM Red
CSM CSM Blue
Consult your Bredel representative for
more detailed information about the chemi-
cal and temperature resistance of pump
hoses.