Enviro-spray™ water truck systems
Enviro-spray™ was specifically developed to be a plug and play system that optimises the use of limited water supplies while still maintaining the dust control barrier required by regulations. The user interface has been simplified by replacing the old dial type control with a user-friendly up-down push button control, foot pedal stop-start switch and LCD display. The Enviro-spray™ push button control sets the water flow rate, road speed and spot spray distances while constantly measuring the water level, filter condition and motor condition. The system can be preset to have default water flow rates, road speed settings and spot spray distances so that the operator may simply select road speed, spot spray or both and drive while the Enviro-spray™ system takes control. It will stop and start the water flow at intersections and automatically adjusts the water flow rate as the machine speeds up and slows down while also stopping and starting to provide the set wet and dry distances.
Night time dust control has always been a daunting task for operators as they could not see the spray while driving and constantly had to adjust the flow control dial as they sped up and slowed down. The Enviro-spray™ road speed control has changed the face of night time dust control by giving the operator the confidence to preset the system to suit the conditions prior to driving and have confidence that the Enviro-spray™ system will do the job.
Enviro-spray™ also converted the first response capability of a standard water truck to a new level giving a water throw distance in excess of 70-meters with an automatic foam injection system adjusting the foam to suit the desired water rate, this increases the efficiency of the limited foam supply. The Enviro-spray™ foam injection system also allows the use of multiple outlets so that foam may be simultaneously supplied to all water cannons, fire hose reel and Excavator backup systems giving the system the ability to become the hub of the fire fighting response.
Maintenance was also kept top of mind in developing the Enviro-spray™ system and this has been optimised by the use of separate modules for each key component, oversize filtration and with conditional indicators giving feedback to the operator. Each key control valve used in the Enviro-spray™ system has its own set of pressure test points and pressure gauge together with manual overrides so that diagnostics can be performed using these test points while following the simple diagnostic tree on the door of the control valve box. The system can be manually overridden if required to allow maintenance to be scheduled at a convenient time.
Connection of the Enviro-spray™ hydraulics involves fitting the Enviro-spray™ soft start sequence valve in the line from the hoist pump pressure filter and connecting the return line from the Enviro-spray™ water pump module to the original hoist valve. There is no loss of brake cooling and the soft start sequence valve prevents the usual shock load when starting the water system since there is adequate pressure to cause the water pump to slowly rotate while unloaded. The Enviro-spray™ system also drops the average running pressure of the hoist pump to below 70-bar (1000-psi) in place of the 175-bar (2500-psi) seen with flow control systems and this significantly reduces the wear on the hoist pump and removes the overheating problem commonly associated with water truck hydraulics. The filtration system fitted to the Enviro-spray™ water pump module works as a full flow kidney system filtering the hydraulic oil to 20-micron.
The basic system consists of a hydraulic pressure sequence valve and water pump module with an electric control system to provide all the basic features such as water rate proportional to road speed, fixed flow rate independent of engine speed and a positive start and stop spot spray with adjustable wet/dry distances. Options such as Enviro-spray™ foam injection, spray head controls, water cannon controls and water level monitoring can all be added to realise the full potential of the Enviro-spray™ system and are simply fitted and plugged into the control system.
The backbone of the system is the large variable motor that controls the speed of the water pump and replaces the complex and troublesome flow control valves that overheat the system and limit the power available.
The control system utilises closed loop technology to set the water rate and thus has made it possible to enhance operator control with features such as, water rate proportional to road speed, fixed rate independent on engine speed and positive start and stop spot spray with adjustable wet/dry distances.
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Enviro-Spray ™ Total water control system.