- Kellogg method is a method to determine the vessel skirt expansion using the average temperature of the skirt. It depend on the skirt thickness, insulation type, skirt length, vessel temperature.
- 2.2 deg C/mm drop mean that for example for a line with 240 deg Ctemperature and 20 deg C instalation temperature, in 100 mm the trunnion will have ambient temperature and will drop no more (by the way, have you noticed that usually the trunnions are not insulated? If the temperature of the trunnion would be as for the line, personal protection insulation should be installed)
Regards,
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Dan