Sand Filter Automatic

New Doosan 22 Tonne Excavator at RH Ovenden Ltd

R H Ovenden Ltd, the materials and waste recycling company based at Aylesham near Canterbury in Kent, has purchased a new Doosan DX225LC crawler excavator from Promac Solutions Ltd, the authorised Doosan dealer for South East England. The reasons for purchasing the new DX225LC excavator include the high productivity, operator comfort, safety and low maintenance offered by the machine. The new DX225LC is based at the Ovenden transfer station at Tilmanstone, where the machine sorts and stockpiles materials such as construction waste, hardcore, concrete, soil, metals and wood brought to the site by customers or in the company’s own fleet of waste trucks and skips.

The excellent working range and lift capacities of the DX225LC contribute to the high productivity offered by the excavator. One of the principal applications for the machine at Ovenden is for sorting, storing and reloading wood waste. With specifications that include a maximum digging reach at ground level of 9.3 m and a maximum dump height of 6.83 m, the DX225LC has the range to work quickly in and around the wood pile, both storing and unloading wood for recycling.

To meet Ovenden’s requirements, Promac Solutions fitted an additional rotation circuit to the DX225LC excavator so that it can operate a grab attachment to handle the wood waste. The machine’s operator, John Faithfull, uses the grab to stockpile the wood waste brought to the transfer station, before using the grab again to reload the wood from the pile into articulated trucks for onward supply to chipboard manufacturers. All of the features on the DX225LC combine to allow Mr Faithfull to fully load one of the articulated trucks in just 25 minutes.

The DX225LC is in continuous operation at the transfer station. When it is not handling the wood waste, the Geith quick hitch on the excavator allows Ovenden to change the grab to a shear attachment for reduction work on the concrete and other construction waste materials stored at the Tilmanstone depot.

With the number of hours the machine works, it is essential that an excavator of this type offers a comfortable, safe and productive environment for the operator and this formed an important part of the purchase decision made by Ovendens. Mr Faithfull has been very impressed with the operator comfort offered by the DX225LC and he says it is a pleasure to work with the machine.

Mr Faithfull is particularly impressed with the spacious cab on the new DX225LC which is fitted with an adjustable suspension seat with headrest and adjustable armrest as standard. He said: “The visibility from the cab is excellent, giving a full view all around the machine and of the tracks. The excavator is also fitted as standard with an on-board camera and the images from the camera are displayed on the control monitor, which gives me a clear view to the rear of the machine for increased safety when manoeuvring and reversing the machine in the tight confines of the depot.

Choice of chemicals for automatic dosing • Chemical Automation and ...

Looking at it this way, the problem with the trichlor is obvious - I would have to drain at least two thirds of my pool just to keep it under 100 (in practice a lot more since the drain and refill is done in stages, not all at once). I've drained and topped nearly 20% earlier this week, and the fresh water needed a lot of heat (the weather is rubbish right now), and messed with my TA, which was stable, but is now up and the pH along with it. So I totally agree that needing lots of dilution is a Bad Thing. The CH of our fill water is 290, so we would get to over 600 in a season using calcium hypochlorite, which seemed a tad high to me. The salesman seemed a bit unfazed by the fact that the CH was starting at 290, and said we wouldn't have a problem. He did say they were looking for pools to trial a new type of cal hypo feeder, which might be on offer for free, so I suppose that's a consideration. The whole TDS thing dates back to the time before CYA was understood. Problems caused by high CYA levels were attributed to TDS, because no one was testing CYA (nor knew what it really did), but testing TDS was common. In effect, TDS was used as a rough proxy for the CYA level. Now that we can test CYA directly, there is no point in measuring TDS, which only has a loose correlation with the CYA level and is not otherwise important. This kind of mistake is very common in the pool industry. Some old rule of thumb (replace water when TDS gets high in order to keep CYA down) gets reinterpreted in a new context (TDS goes up just a little more when using sodium hypochlorite compared to trichlor) to come to a completely incorrect conclusion (sodium hypochlorite requires more water replacement than trichlor).

Congressional edition

Proceedings of the Royal Society of Queensland

Chemical engineers' handbook

The encyclopædia britannica, a dictionary of arts, sciences, literature and general information

Water-supply paper