Watson-Marlow 620RA - Manual (Page 6)

ATEX: Watson-Marlow 620RA, 620REA and 620RE4A pumpheads User Manual 6
7 Tube life
A number of factors contribute to the life of the tubing:
Factors influencing tube life
Normal tube fatigue - dependent on tube size and material
Incorrect tube loading - see 620R, 620RE and 620RE4 manual (m-620r-gb-01) 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.
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
recognised 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.