# The Simple Pressure Vessels (Safety) Regulations 2016, Paragraph 17: Experimental method


Wall thickness must be so determined as to enable the vessels to resist at ambient temperature a pressure equal to at least five times the maximum working pressure, with a permanent circumferential deformation factor of no more than 1%.

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Source: https://www.legislation.gov.uk/uksi/2016/1092/schedule/1/paragraph/17 (the official version)
Page: https://openlegislation.uk/simple-pressure-vessels-safety-regulations-2016/schedule-1/paragraph-17
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.