10.1 DIAGNOSIS OF DIAPHRAGM FAILURE
The following guide provides some potential causes of diaphragm failure; it is based upon visual
observation of the diaphragm. Careful observation of both the pump and the surrounding
system is necessary for proper diagnosis. This is only a guide and may not include all potential
causal factors.
Puncture, surface wear, or physical
damage
Abrasives or solids in the process stream
Foreign object in process or hydraulic system
Extrusion and/or failure to the front
(towards the process end)
Extended time under poor suction conditions, can include
inadequate NPSH, closed valves, clogged strainers or
filters, obstructed piping
Malfunctioning HPV
Extrusion and/or failure to the rear
(towards the hydraulic end)
HPV filter screen clogged
High (excessive) suction pressure
Discharge pressure above maximum limit
Leaking (damaged) discharge check valve
Change in surface characteristics, color,
smoothness
Chemical incompatibility with the product
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