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Dumper redesign cuts vibration risk

PLANT - Operators can use new hi-tip safely for five hours a day, says plant maker TCP

ESSEX plant manufacturer TCP has claimed its redesigned hi-tip dumper reduces exposure to hand-arm vibration.

The firm, which manufactures a range of plant including dumpers and crushers, said an operative can use the dumper for more than five hours a day.

The firm warned contractors that hi-tip dumpers were a potential source of HAV that had so far been overlooked.

The firm has housed the engine of its HiT500 on elastomeric dampers to cut down the primary source of vibration.

Sales director David Tetchner said: 'We came up with a bespoke compound to mount the engine on, which effectively isolates the system and cuts vibrations and sound. We couldn't use rubber mountings because rubber is degraded by diesel.' The firm called in consultant Acoustic Associates to test the vibration output.

The results showed the worst case 'vector sum' output was 6.2 m/sec/sec.

At this level employers would need to implement a monitoring regime after 1 hr 18 mins, but an employee would not have to stop work until five hours of exposure was reached.

Mr Tetchner said: 'When we researched it we discovered that the typical usage was only two hours a day.' He added: 'Our smallest tracked crusher was also tested, since it is pushed by hand.

It provided a vector sum reading of 5.8 m/sec/sec. But, since it is generally moved into place then left, requiring around 15 minutes' use a day, it is well within the exposure limits.' Mr Tetchner said TCP's dumper testing regime was a response to demands from end-users looking to provide vibration exposure risk assessments for all machines on site.

He said: 'It is the type of product that people overlook at their peril. We need the credibility of independent testing but, as far as we know, we are the only ones doing it for dumpers.'