cold zone are generally temporary, and they appear during the come up phase of the retort operation. The temperature should be uniform throughout the product zone and, within an acceptable toleance, equal to the designated process temperature at the end of the come-up time (CUT). The (CUT) is the time, starting at the introduction of the heating medium into the retort, for the retort temperature to attain the specified process temperature.To overcome the inadequate treatment of temperature distribution studies in the literature, the Institute for Thermal Processing Specialists (IFTPS,1995) há formulated specific guidelines, which, with the permission of the Institute, are reproduced here.1. PREOARATION; GENERAL,PROCESSING EQUIPMENT SURVEYIt is important to develop or establish proper documentation during the survey of the processing equipment that will enable a proper evaluation to be made prior to the process of selecting the test retort. Prior to selection of the test retort, a survey should be made of the following:1.1. Steam Supply to the Retorts:1.1.1 Boiler capacity and pressure.1.1.2 Retort header pressure. It is important to ensure that adequate steam pressure and volume is being delivered to the test retort1.1.3 Pipe size and length, valve size and types, from the main steam line to the retort rôm.1.1.4 Size of all connecting steam pipes to the main line noting equipment using steam ( blanchers, exhaust boxes,..)
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