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7. OPERATING INSTRUCTIONS
7.1 MEASURES TO BE TAKEN PRIOR TO START-UP
The unit may be put into operation by specialized personnel.
Using the pump submerged in fluids or in a particularly aggressive or explosive/flammable environment is prohibited
unless it has been prepared ahead of time by the supplier for this purpose.
Use gloves and eye protection as required by the lubricant safety data sheet.
DO NOT use lubricants that are aggressive to NBR gaskets. If you are unsure, contact the Dropsa S.p.A technical office
for a detailed list of recommended lubricants.
Never ignore health hazards and always follow sanitary regulations.
Always use suitable piping for the operating pressure.
Check the integrity of the pump;
Check the lubricant level in the reservoir (min/max indication on the reservoir), in case of low level, proceed as
described in Section
7.3 Filling the reservoir
;
Ensure that the pump operates at operating temperature and that the pipelines are free of any air bubbles;
Check the correct connection of electrical devices.
To determine the maximum operating pressure, it is necessary to know the pressure drop of the pipeline connected to the
pumping elements.
As an example, the following diagram shows the pressure drop of the delivery pipeline flow by unit length depending on
the operating temperature and for a particular type of lubricant (in this case NLGI 00 grease with 160cSt base oil and
NLGI2 grease with a 180 cSt base oil)
Depending on these variables to achieve a proper supply to the delivery point, it is always necessary to ensure that the
pipeline pressure loss plus the pressure required at the lubrication point does not exceed the maximum pressure supplied
for pump delivery.
The maximum pressures corresponding to the delivery point of the pumping element, taking into consideration the most
severe operating conditions are as follows, taking the toughest operating conditions into consideration:
1÷12 pumping elements = 80 bar (1160 psi)
13÷24 pumping elements = 50 bar (725 psi)
25÷36 pumping elements = 35 bar (507 psi)
