162 Practical Centrifugal Pumps
• Total acid number
• Wear particle analysis and wear particle count
• Moisture content.
Most of these tests have to be performed under laboratory conditions. Portable
instruments are now available that enable the user to perform the test on site.
9.1.4 System analysis
A system analysis is a method of determining the system resistance curve of the pump as
depicted in Section 3.6. This can be further used to evaluate the NPSH-a for the pump as in
the installed condition.
A typical system analysis will include the following information, NPSH-a, NPSH-r,
static head, friction loss through the system, and a complete review of the piping
configuration and valves and fittings.
System analysis is often overlook ...