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Document ID (ISN)112345
CIS number 12-0228
Year 2009
Convention or series no. RR 710
Author(s) VÚchot L.N., Hare J.A.
Health and Safety Executive
Title Assessment of the applicability of Dewar tests for screening hazardous waste treatment
Bibliographic information HSE Books, P.O. Box 1999, Sudbury, Suffolk CO10 2WA, United Kingdom, 2009. vi, 77p. Illus. Bibl.ref.
Internet access Assessment_of_the_applicability_[INTERNET_FREE_ACCESS] [in English]
Abstract In the waste treatment sector, the exothermic reaction incompatibility of mixtures is often determined by recording the temperature rise after mixing samples in a beaker. Instead, the use of non-pressurized Dewar vessels has been proposed by some parts of the industry as an improvement, because their cooling rates and heat losses are closer to bulk containers. Temperature rises of between 6-10░C in the Dewar vessel over a period of 10 minutes have been suggested by the industry to indicate an exothermic reaction of concern, with gas bubblers being used to indicate any gas generation. Specialist inspectors have questioned the validity of these test methods for scale-up to large volumes. The objective of this work was therefore to investigate the range of applicability of the proposed technique. It was found, in particular, that the proposed ten-minute timescale could be insufficient to detect a runaway reaction. A number of other limitations to scale-up are discussed.
Descriptors (primary) United Kingdom; exothermic mixtures; exothermic reactions; hazard evaluation; experimental determination; disposal of harmful waste
Descriptors (secondary) reliability; public OSH institutions; glossary; report; description of technique
Document type E - Books, reports, proceedings
Country / State or ProvinceUnited Kingdom
Subject(s) Environmental pollution
Broad subject area(s) Chemical safety
Fires, explosions and major hazards
Browse category(ies) Waste collection and disposal