“Our existing manufacturing facility can produce 400 machines annually and plans are on for further expansion in the coming years,” says Girish Dixit, Head - Engineering & Design, Wirtgen India. In a freewheeling chat, Girish speaks about the industry trends.
Tell us about the range offered in compaction equipment and also their unique features? Wirtgen India offers Hamm-11T soil compactor, 9T asphalt compactors and 24T pneumatic tyre rollers (PTR) for the Indian market. Hamm compactors come with German design and technology mainly featuring excellent operator comfort and safety. The equipment are powered by a fuel-efficient and highly durable water-cooled engine.
Hamm is the technology leader in compaction which has been awarded many design prizes for its latest innovations. Recently, it was awarded iF-Gold award 2010 also called the Design Oscar for new HD+ series of asphalt compactor. The GRW 280, rubber-wheeled rollers received the iF Design award 2010.
Higher quality level of the components used in Hamm compactors increases the durability of the equipment. Better serviceability and reduced maintenance frequency with less fuel consumption results in the lower operating cost of the equipment.
What is the existing manufacturing capacity for these product lines? Our existing manufacturing facility can produce 400 machines annually and plans are on for further expansion in the coming years.
What is the rental scenario for these products? Currently, Wirtgen India is not in the rental market and is only selling the new equipment in the retail and corporate segments, rental companies.
Are these products compliant with the Bharat stage III emission norms? Yes, the equipment built after April 2011 will comply with Bharat stage III emission norms.
How do you look at the replacement/ repowering market for the units sold which are not complying with Bharat stage III norms? As per the regulations, no replacement/re-powering is required for the units built with Bharat stage II norms.
Why vibratory compactors over static ones and what is the vibration effect in compaction over the static loading? Vibratory compactors develop dynamic force in addition to the static load and total applied force is the sum of dynamic force and the static weight of the machine. For example, Hamm 11T soil compactor generates 24T dynamic force and with 6.8T static weight at the drum will induce 30.8 tonne load on the ground. The advantage of using 11T vibratory soil compactor versus 30 tonne static compactor is evident from this.
The vibratory compactor with drum vibrating at higher amplitude will result in compacting the higher lift thickness and achieving the required density compared with the static roller. In the static roller, the linear load is not uniform over the width of the machine (one front roller and two rear rollers) which results in uneven mat finish. In the vibratory compactors, the linear load is uniform along the width of the drum.
To what extent do soil conditions determine the selection of compactors? Could you tell us the reasons? Type of soil and conditions like moisture content decides the achievable density within the required number of passes. It is important to select the suitable compactor which will develop the required force to achieve the density with lesser number of passes on the appropriate lift thickness.
What determines the maximum achievable density? Density depends on the soil characteristics (type of soil) and optimum moisture content (OMC) present in the soil. Generally, 95 to 100 per cent density can be achieved with 11T soil compactors on the appropriate lift thickness.