Verification 09 : Verification. Refers to the whole process of checking the PTW system through daily monitoring to periodic audits and reviews to ensure the system continues to function as intended
International Association of Oil & Gas Producers OGP and International Association of Geophysical Contractors, Guidelines on Permit to Work (P.T.W.) Systems (Report No. 6.29/189 Jan 1993), London, UK 1999. http://www.ogp.org.uk/pubs/189.pdf, (Hlth, Sfty and Envir Mgt Sys - Brit) {772}