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Fail-Safe Requirements for Holding Tube Pressure in an Ultra-High-Temperature Steam Injection System¹

Department of Food Science, North Carolina State University, Raleigh 27650

ABSTRACT

A steam injection system for ultra-high-temperature pasteurization was examined for fail-safe requirements for pressure within the holding tube.

Holding tube temperatures from 80 to 150°C, holding tube pressures from 46.9 to 552 kPa, and differences between holding tube and saturation vapor pressures from 73.6 to 380 kPa were studied. The back pressure valve was controlled to simulate both rapid and gradual pressure failure in the holding tube. Measured were holding tube temperature and pressure and time from failure of holding tube pressure to rejection of the product at the flow diversion valve. The location of the flow diversion valve (upstream and downstream from the vacuum chamber) was of primary importance for establishing fail-safe criteria.

¹ Approved for publication as paper No. 6060 in the Journal Series of the North Carolina Agricultural Research Service. The use of trade names in this publication does not imply endorsement by the North Carolina Agricultural Research Service nor criticism of similar ones not mentioned.