ACI supplies blower units for vacuum excavators
An
Air Control Industries product story
Edited by the Engineeringtalk editorial team
Apr 28, 2009
Air Control Industries (ACI) has supplied special blower units to Doncaster-based Vac-Ex for its mobile vacuum excavators.
Vac-Ex designs and builds mobile vacuum excavators that are said to provide fast and efficient excavation without the risk of damaging buried utility services, such as pipes and cables.
Employing a high-pressure air and a vacuum system, operators of Vac-Ex's Mod-Ex 5000C lorry-mounted excavator are able to excavate and remove hole/trench material in less time than is normally required.
The excavation is left clean for easy access to any utility that might need servicing.
The excavation is performed using an air lance that delivers 180cfm of air at pressures up to 100psi/8bar from an onboard Compair compressor.
Once the earth has been loosened, it is sucked up (wet or dry) via a 125mm/180mm hose and fed into an integral 1.2m3 skip using a vacuum system.
The high-pressure vacuum required to lift the excavated soil is provided by two pairs of special blower units, which have been supplied by ACI.
The blower heads are normally used in ACI's EP10 blower and driven by an electric motor (7.5kW, 11kW or 15kW).
For this application, however, each pair of blowers is belt driven by a dedicated 50hp Lombardini diesel engine.
As there are two separate vacuum units, the level of vacuum can be reduced for light duties, which is more energy efficient than some alternative systems that employ single drive units.
It also allows work to continue if one power unit goes down.
Much of the Mod-Ex 5000C's overall enhanced reliability results from the fact that ACI's blower impeller shafts are mounted on a two-bearing assembly, whereas the previous unit only employed a single bearing.
ACI's dual-bearing configuration serves to reduce stress, which enhances durability and reliability, thereby minimising the risk of downtime and ensuring greater operating efficiency, according to the company.
William Bell, technical director of Vac-Ex, said: 'ACI has been flexible by providing us with just the blower heads, which has avoided the need to provide an electrical power supply.
'The blowers are ideal for our needs and help to keep the Mod-Ex 5000C compact and easy to maintain,' he added.
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