Production interruption filtered out at paper mill

John Morfield engineers have cured problems with the raw water inlet supply to restore uninterrupted production at a large UK paper mill. The mill began to experience problems when the makeup of the inlet water was altered to meet improved environmental standards. Water demand for the mill that manufactures disposable paper products from recycled materials is 11000 litres per minute for production machinery that runs continuously 24 hrs a day 7 days a week.

To reduce overall water capacity the production team added recycled water from the effluent treatment plant to the main raw water inlet source, in line with upgraded environmental guidelines. As a result a certain amount of debris from the production and effluent treatment processes was being re-introduced and began to overload the inlet filters. This precipitated excessive mechanical back-washing which at times was still unable to prevent the filter from blocking completely.

On such occasions the mill engineers had to bypass the inlet filter causing contaminated water to reach the production machinery leading to problems with blocked spray nozzles and premature blockage of filtration equipment in these critical areas. This was leading to lost production whilst the plant was shut down for cleaning. John Morfield engineers recommended re-placing the existing filter system with a Cross 200 installation fitted with 75 micron filter coils in eight individual pods.

The system 2000 is a modular design that is custom built to meet the exact operating criteria of each application. The requisite number of filter pods each containing seven patented zero gravity stainless steel filter coils is fitted to a manifold to meet the maximum operating flow and pressure. Because each filter pod is backwashed individually under PLC sequential control forward flow through the filter is never interrupted and there is no need to oversize the filter.

After the filter system was installed the mill engineers reported that the problems had been completely cured enabling production at the mill to return to normal and the threat of unplanned outages has been removed.