Watson-Marlow Bredel 265 - Manual (Page 18)

DESCRIPTION
18
4.4 Pump hose
4.4.1 General
The pump hose is made of special rubbers, reinforced
with nylon cords and is constructed as follows:
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 color code.
Natural Rubber*
Always the first choice hose. A highly dynamic material,
which has excellent abrasion resistance and
mechanical strength, and is generally resistant to
diluted acids and alcohols.
Max. liquid temperature 80 °C (175 °F).
Min. temperature -20 °C (-5 °F).
Nitrile rubber*
A highly abrasion proof and wear resistant material that
is generally resistant to oils, fats, alkaline, and
detergents. Suitable for a wide range of food handling
and meets FDA and 3A standards.
Max. liquid temperature 80 °C (175 °F).
Min. temperature -10 °C (15 °F).
B C
A
Hose type Material Color code
NR Natural rubber Purple
NBR Nitrile rubber Yellow
EPDM EPDM Red
CSM CSM Blue