14.5.4 - Checking the pump flow rate
This is a check of the pump's flow rate curve according to the adjustment, as it is an essential parameter
together with the verification of the working pressure to check the regular operation of the pump and
therefore of the process.
Three measurements are sufficient: adjustment to 100% - 50% - 25%.
• Install a flow rate calibrator at the pump's suction, measure the pumped liquid volume in a certain
period and in normal operating conditions.
• For a constant and precise monitoring of the working process, we recommend installing a flow
meter, electronic is preferable.
14.5.5 - Pressure
• The increase in pressure due to the crystallisation of the pumped product is a very dangerous
phenomenon as it becomes a RESIDUAL RISK factor to be closely monitored. It can obstruct
the discharge pipe and the pressure relief valve shutter rod fitted on the plant, with the potential
breakage of the gaskets between the flanges or joints, causing leaks and the outflow of
substances which can be dangerous and corrosive, and can corrode the dosing pump or parts
of the plant. In these cases, it is also possible to exceed the pressure value that the plant can
withstand.
• The pressure can be checked visually via a pressure gauge located on the plant (see description
example of standard plant accessories) or by an electronic pressure measuring instrument for a
remote and continuous reading from the control room.
• Do not exceed the nominal pressure indicated on the rating plate! Otherwise the pump may
be damaged!
14.6 - Routine maintenance
The table shows the parts subject to greater wear and, therefore, requiring routine maintenance.
Verification is recommended and replacement every 4÷6 months
14.7 - Valve unit cleaning
It is recommended to carry out the procedures in the indicated order after consulting the assembly
drawings.
• Discharge circuit: unscrew the discharge container. Remove the valve seat, the ball and the valve
guide, paying attention to the order it is assembled in.
• Clean the threaded parts of the pump head and the valves of any impurity.
• Clean valve components. If the parts are worn, proceed with replacement.
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