7 tube life – Watson-Marlow 700 series User Manual
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ATEX Directive: Watson-Marlow 700 series pumpheads User Manual
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For each application it is strongly recommended that tube life should be determined
by trials, prior to installation in a hazardous environment. If this is not possible, or
if there is any doubt in terms of tube life then the following hazards should be rec-
ognised before installing a pump in a potentially explosive atmosphere:
Chemical reaction between pumped fluid and pump materials - the
materials of construction are listed in Section 10
Pumped fluid can be ignited by surface temperature of rollers - all
Watson Marlow’s ATEX equipment has been rated as T4 (mean-
ing that even under worst-case operating conditions the maximum
surface temperature will not exceed 135C)
Factors influencing tube life
Normal tube fatigue - dependent on tube size and material
Incorrect tube loading - see 701R manual (PB0230) for guidance
Excess working pressure - see Section 4 “Operating parameters”
Chemical incompatibility - a table of tubing compatibility can be
found on http://www.watson-marlow.com/wmb-gb/p-chem-a.htm.
Immersion kits are available from Watson-Marlow for testing.
7 Tube life
A number of factors contribute to the life of the tubing: