# The Planning (Hazardous Substances) Regulations 1992, Paragraph 4: Above ambient temperature vessel conditions


A hazardous substance shall only be present at above ambient temperature and at or below its boiling point at 1 bar absolute in a vessel in a vessel area if—
(a) it was present at above ambient temperature and at or below its boiling point at 1 bar absolute in a vessel in that vessel area at any time during the establishment period;
(b) the vessel in which it is present does not have a greater capacity than that specified in column 7 of Table C; and
(c) the pressure at which it is present does not exceed—
(i) atmospheric pressure, if the substance was not present at above atmospheric pressure at above ambient temperature and at or below its boiling point at 1 bar absolute in a vessel in that vessel area at any time during the establishment period; or
(ii) the pressure specified in column 8 of Table C, in any other case.

---
Source: https://www.legislation.gov.uk/uksi/1992/656/schedule/3/paragraph/4 (the official version)
Page: https://openlegislation.uk/planning-hazardous-substances-regulations-1992/schedule-3/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.