Keeping the presses rolling at temperature
15 Jan 2000
Crane Heatex has recently completed the installation of an eight-stream temperature control system for a Berstorff calender line at a vinyl film production mill.
As part of the system, a total of 14 separate heat exchangers is used to adjust the temperature of the heat transfer medium. A combination of shell and tube and plate designs was selected, depending on individual output requirements of each stream.
The 30bar high pressure, hot water system can operate at temperatures between 9 - 205 degreesC and each of the eight streams - four calender rolls, one embosser and three streams supplying multi-roll stretching units - can be controlled to +/-1degC.
In the absence of original design data and thermal loadings, Crane undertook a detailed investigation into system control, failure mode, maintenance, `on-the-fly' repair, minimum energy usage, installation, safety and operator training. The end result was an agreed specification, from which Crane designed, manufactured, installed and commissioned the whole system. This consists of a dedicated heater, cooler, pump and controller for each main calender roll, together with the whole control system and ancillary equipment.
In addition, Crane also supplied a 27bar dual fuel steam generator as a skid-mounted package complete with flue, heat recovery, water softeners and blowdown.
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