Page 256 - Root Cause Failure Analysis
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244 Root Cause Failure Analysis
Table 19-2 Common Failure Modes of Rohry-Type, Positive-Displacement Pumps
Source: Integrated Systems, Inc.
such failure is to ensure that proper maintenance is performed regularly on these com-
ponents. It is important to follow the manufacturer’s recommendations for valve mainte-
nance and replacement.
Because of the close tolerances between the pistons and the cylinder walls, reciprocat-
ing pumps cannot tolerate contaminated liquid in their suction-supply system. Many
of the failure modes associated with this type of pump are caused by contamination
(e.g., dirt, grit, and other solids) that enter the suction side of the pump. This problem
can be prevented by the use of well-maintained inlet strainers or filters.
