In some cases a lower flow rate allows to increase the pressure and thus the force of impact (see pressure curve of the pump). That will have a beneficial incidence on the quality of cleaning (quality, time…).  In the majority of the cases it is not advised to reduce the water flow more than 30% because that can influences the perception of the operators and eliminate the saving of time (saving of time = water saving). (see link above: To reduce - To optimize).

If the maximum pressure permitted by the booster is lower than 20 bars, carry out the same procedure and  take into account only the flow rate (without taking account of the pressure) and choose the flow rate of Fitjet nozzle at 20 bars nearest to the one measured.

Advise: if the pressure at the operator level is lower than 20 bars, it can be useful to raise the pressure to 25 bars minimum in order to optimize the cleaning and thus to make substantial savings (quality, time and water savings) with fast investment return. (see link above:  To optimize)

Initially, it necessary to control the flow and the pressure at the operator level. Because of the wear or possible modification of the usual nozzles, it is recommended to realize a control as suggested below.

This control will ensure you to measure the real pressure used and to evaluate the boosters and the distribution network (see link above: To optimize - your pressure equipments)

Reminder: it is important to take into account the pressure at the level of the operator and not at exit of the booster. Indeed the pressure also depends on the length and on the diameter of the distribution network and of the hoses as well as of the number of operators working into simultaneous. It is important to take these measurements when all operators are in action at the same time.

To do the control use a can and a manometer equipped with 2 quick couplings which you must place between the nozzle and the valve or gun.

            1 - Place the manometer before the nozzle and put in pressure.

2 - Check that all operators (even if use of a mobile pump by operator) are in action at the same time in order to take into account the lowest pressure. The pressure can vary according to the number of operators. 

3 - Regulate the pressure by progressive turn of the valves in order to obtain 20 bars. If use of a gun, reduce the pressure by using the valve at the descent of the network or at the exit of mobile pump.

4- Then determine the flow at 20 bars at the exit of nozzle by using the can and a chronometer during 30 seconds minimum (better precision). 

5 - When measurement is made extrapolate the flow in litre per minute. By using the table below choose the with flow rate equal or lower according to the objectives.

PROCEDURE

The determination of the calibration of the nozzle is made according to the criteria you will have chosen.  The different choices are important for the correct operation of cleaning (water saving or/and labour reduction, saving of time for the production, to limit the problems of recruitment, effectiveness and quality of cleaning, to improve the working conditions and to decrease the risks of musculoskeletal disorders …) The descriptions (via link above) will help to determine objectives decided.

MEDIUM PRESSURE INSTALLATION

Patent

International patent n° 1654 070

National patent n° 06 06618

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