Line Opening References:
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OSHA Hazard Information Bulletin – Chemical Exposure from Industrial Valve and Piping Systems
https://www.osha.gov/dts/hib/hib_data/hib19960514.html
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OSHA 29CFR1910.147 The Control of Hazardous Energy (lockout/tagout)
https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=9804
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UK Health & Safety Executive: OCE 12 Breaking Containment – Hydrocarbon Lines
http://www.hse.gov.uk/pubns/guidance/oce12.pdf
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UK Health & Safety Executive: OCE 11 Breaking Containment – Non-hydrocarbon Lines
http://www.hse.gov.uk/pubns/guidance/oce11.pdf
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CSB Safety Bulletin “Removal of Hazardous Material from Piping Systems” July 5, 2004
http://www.csb.gov/assets/1/19/PipeOpeningBulletin.pdf
General Guidance on Permit to Work
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UK Health & Safety Executive: Guidance on Permit to Work Systems
http://www.hse.gov.uk/pUbns/priced/hsg250.pdf
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International Association of Oil and Gas Producers: Guidance on Permit to Work Systems
http://www.ogp.org.uk/pubs/189.pdf
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Norwegian O&G Association - Recommended Guidelines for a Common Model for Work Permits