PA S.p.A.
USER MANUAL FOR WATER-DRIVEN ATEX TANK
CLEANERS
INGLESE
PQ02-A13
Revisione: 09
Del: 01/09/2016
Codice: PQ02-A13
Pagina 5 di 8
2.3. Use & Working
2.3.1 Working & Adjustment
The rotation of the head is achieved, using the same fluid under pressure bound for washing, by means of a
hydrokinetic group set up by a turbine operated by three injectors and a epicycloid reducer; this system
gives a raised torque on exit. We therefore recommend to fit a nozzle protection kit code 25.4822.00 in order
to protect the nozzles from matter. The rotation frequency can be regulated, within the indicated values of
the Technical specifications, by altering the orifice diameter of the three internal injectors (pos.22 exploded
view) of the hydrokinetic group which is always directly proportional of the flow rate as seen from the D3
diagram of this manual.
Pressure changes (at constant flow rate) or water temperature do not modify the rotation frequency value. A
complete washing cycle is carried out after 58 revs of the main axis, considering that a complete washing
cycle is over once the jets have covered an ideal spree and have returned to the starting point. The time for
a complete cycle, directly proportional to rotation frequency, can be obtained from diagram D2 of this
manual. For a perfect washing we recommend at least 3 complete cycles.
The procedures to observe during function concern the process levels and correct running.
2.3.2. Suitable & Non-Suitable Use
Overall utilization: The head can work solely by a continuous flow which fills constantly the body, minus
impurities and air bubbles. The rotation of the head forms a strong trigger source if this should occur with an
empty head. However, the head is operated solely by the water flow and the rotation starts only by a
significant minimum pressure function. If there is a lack of the water flow, the internal members stop. A 3 bar
minimum pressure from the mains guarantees constantly the filling of the head and therefore prevents
eventual void rotations. Install a gauge to verify the mains pressure.
Seeing that during the normal function the trigger sources are firmly immersed in the wash liquid, the head is
appropriate to function even in the case where inflammable fluids are passed internally.
The cleaning liquid should have an ignition temperature of minimum 50K over the maximum exterior
temperature of the appliance's surface where the cleaning liquid is utilized. (T=200°C).
It is forbidden to make substantial modifications to the head (replacement of parts not recognised by
PA spa or assembly variations).
In the other cases of ordinary & extraordinary maintenance and repairs,
refer to the maintenance manual.
In no case is it foreseeable to guarantee the protection from trigger sources for superior strains other than
those maximum permitted (PS
– TS –velocity) considered in the planning stage, in view of the safety
measures adopted.
The Company PA spa declines all responsibility for damage to persons, animals or things derived by an
improper use of the apparatus a/o the non observance of the dispositions contained in the present manual.
2.3.3. Dangerous Areas
Particular attention has to be reserved to any area potentially esplosive around the head and also from the
inside.Do not open the head in areas potentially esplosive and during working. Before opening the head,
disconnect it from the machine and bring it to a safe area.
It is severely forbidden to operate on the tightening components and on the apparatus connections
whilst running and in any case each time it is predictable that the area may contain a potentially
esplosive ambient.
2.3.4. Danger & Possible Risks
Hot surfaces
The heads always present the danger of hot surfaces due to the maximum temperature of 90°C: always
check that the internal fluids and external areas cannot trigger off at such a temperature. The surface
