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Pressure Test
Description
The pressure test is a quick, built-in test designed to demonstrate the
pressure-tightness of the system. The test should be used when problems
with small leaks are suspected, or after maintenance of flow-path
components (e.g. pump seals, injection seal) to prove pressure tightness up
to 400 bar. The test involves monitoring the pressure profile as the pump runs
through a predefined pumping sequence. The resulting pressure profile
provides information about the pressure tightness of the system.
The column compartment outlet (or the outlet of the last module before the
detector) is blocked with a blank nut, and then the test is run using isopropyl
alcohol (IPA), while monitoring the pressure profile (using an integrator on
the analog output, or in the plot screen in the ChemStation). The pressure
profile is shown in Figure 8.
Figure 8 Typical Pressure-Test Pressure Profile with IPA
Step 1 The test begins with the initialization of the pump. After initialization,
plunger 1 is at the top of its stroke. Next, the pump begins pumping solvent
Time [minutes]
Pressure
Step 1
Step 2