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Weigh System Cuts Plant Commissioning Time

The initial calibration of weighing equipment in process plants often presents a major problem. And even when a plant is in production regular checks to ensure the equipment remains accurate can prove time consuming and dangerous. But a system said to overcome these problems has been developed by Setpoint Ltd, London, and in a recent installation for the British Steel Corporation, the time taken to calibrate a multihopper weighing system was less than onetenth of the time taken to calibrate a similar system by traditional methods. Process plants use a large number and variety of weighing devices. A modern steelworks, for example, will have up to 50 separate weighing points with capacities of up to 600 ronnes. The initial calibration of this weighing equipment presents a major problem, because certified weights have to be provided and manhandled on to the various weighing machines. When the plant is in production it is a lengthy and often hazardous task to check that weigh systems remain accurate and serviceable an operation which can only be carried out during a shutdown. The Setpoint equipment loads each weighing machine by hydraulic jacks and measures the applied force by loadcells, whose calibration has been certified by the National Physical Laboratory. The equipment is taken from location to location so that everything is calibrated to the same standard. Immediately after this initial calibration, a permanent hydraulic member and measuring loadcell is linked in place of the portable calibration set.