MACHINERY
WATER AUTHORITY HAPPY WITH VENTURI-AERATOR An Australian Water Authority has recently installed a Venturi-Aeration system from Hydro Innovations into a sludge storage tank to add dissolved oxygen, remove nutrients and mix the tank. A Gorman-Rupp Super T Series pump was used with a 30kW motor to “drive” the Venturi-Aerator, and the unit was set up to discharge several metres below the surface. All of the aeration equipment [pump and venturi unit] is located on the outside of the sludge tank, giving operators quick, safe and easy access to the equipment for monitoring. It is also convenient for operators to perform routine maintenance to ensure a long service life for the system. The system works using Bernoulli’s principle, whereby a decrease in pressure is caused by increasing the speed of a fluid. The Gorman-Rupp pumps draws fluid from the tank [or lagoon or basin] to be treated, then discharges it into the VenturiAerator, where a nozzle accelerates it up
saturated with dissolved oxygen. The venturi unit has no moving parts.
to 16 metres per second. This increase in velocity creates a low-pressure area within the Venturi unit, enabling atmospheric air to be drawn into the unit where water and air are mixed under pressure. The effluent is then discharged,
COOL, WASH AND RINSE WITH EXAIR
Venturi-Aerators are available in four sizes [50mm, 75mm, 100mm and 150mm], enabling the delivery of up to 30kg of dissolved oxygen per hour. Multiple units are used where more oxygen is required. For large applications, larger single pumps can be used to pressurise multiple Venturi-aerators. The Water Authority was very
The stainless steel construction of the liquid atomising nozzle adds to its durability and corrosion resistance. Available now from Compressed Air Australia, the FullStream range of nozzles
OCTOBER 2020
Hydro Innovations 02 9898 1800 www.hydroinnovations.com.au
ON OVERHEAD CRANES LOAD LIMITERS
ROPE AND CHAIN CRANES AND HOISTS • Helps reduce the risk of accidents • Protects against overloading of Crane and supporting structures • Quick and easy installation and available for all capacity cranes • Available preset or easily calibrated on site • Helps reduce maintenance costs • Minimizes down time • Automatic reset by reducing the load
The tangential flow of the FullStream is vaneless, which creates wide-open internal features to resist clogging. Distribution is uniform in a round pattern with medium to large droplets, while the right-angle design is compact and can operate up to 100 PSIG liquid pressure.
Liquid is supplied into the body of the nozzle, creating a swirling action within a vortex chamber. This vortex produces the spray pattern when the machined nozzle breaks the liquid surface tension as it exits the orifice and into a controlled spray angle.
Their average dissolved oxygen levels of up to 1.3mg/L are being maintained and ammonia nitrogen and phosphorus levels are less than 1.0mg/L.
REDUCE MAINTENANCE COSTS
New from EXAIR, the ¼ NPT FullStream liquid atomising spray nozzle provides a full cone spray pattern for pressurised liquids. Whether you’re cooling, washing, cleaning, rinsing or even suppressing dust, the FullStream is the solution.
FullStream cone nozzles are particularly effective with liquids containing particulate.
particular in specifying parameters for the system to meet, and rate the unit as delivering good performance, ensuring aerobic conditions are maintained.
are CE compliant and available in a variety of flow rates. The FullStream nozzles complement EXAIR’s large line of 1/8, ¼ and ½ NPT Air Atomising and No Drop Air Atomising spray nozzles, all of which come with EXAIR’s five-year built-to-last warranty. Compressed Air Australia 1300 787 688 www.caasafety.com.au
CONDUCTOR BAR • • • •
Available in steel & copper Quickly and easily installed Supports required only every 1.5m Also available in a compact cluster range
SIDE PULL PREVENTERS / ROPE GUIDE PROTECTOR Prevents side pulling and protects rope guides and drums on most multi-fall cranes & hoist • Prevent dragging of loads • Easily fitted to any crane/hoist • Helps reduce down time
Liftco Industrial Supplies Pty Ltd
(02) 9829 4411 sales@liftco.com.au
www.liftco.com.au
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