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0 0 SAFE WORK PRACTICES FOR CONTRACTORS WORKING AT RETAIL PETROLEUMICONVENIENCE FACILITIES 39 • A full evaluation of the hazards. • Removal of combustible materials that are not part of the fueling system. • Issuing a Hot Work permit(see multi-permit form,Appendix B.3). • The presence of a fire watch. The requirements ofNFPA 51B are herein incorporated by reference.Please see section 4 above for more information about eval- uating Hot Work hazards. 13.2 THE FIRE TRIANGLE(FUEL, OXYGEN, IGNITION SOURCE) Three components shall be present at the same time to produce the Fire Triangle chain reaction that is fire: Oxygen Hest • Enough oxygen to sustain combustion, • Enough heat to provide an ignition source, m• • Some sort of fuel or combustible material,and This is called the Fire Triangle.Remove any of the three pieces of the triangle.or 40-1 Fuel otherwise disrupt the chain reaction and a fire cannot occur. 13.3 REQUIREMENTS FOR AND DUTIES OF THE FIRE WATCH 13.3.1 Requirement for a Fire Watch A Fire Watch is required for all Hot Work.The Fire Watch shall assist Hot Work activities by providing fire protection,air moni- toring,and being constantly aware for fire hazards.As a minimum,one 20-pound or two 10-pound ABC dry chemical fire extin- guishers shall be available for immediate use. The work supervisor is responsible for assigning a Fire Watch when Hot Work is within 35 feet of a potential combustible or flammable vapor source.The Fire Watch shall be trained in the proper use of a fire extinguisher.The supervisor shall review the duties with the Fire Watch before the fire watch begins or when any conditions change or new hazards are recognized during the fire watch 13.3.2 Duties of a Fire Watch • Understanding the location and nature of the Hot Work. • Remain in the area while the work is being performed and remain in constant communication range with person(s)doing the Hot Work. • Have a fire extinguisher available and ready for use if necessary. • The Fire Watch is authorized to stop the Hot Work whenever work conditions become unsafe or if the work description on the permit is exceeded.The supervisor shall be notified for any"stop work"situation. See Hot Work Appendix A.4 for detailed duties of the Fire Watch. 13.4 HOT WORK PERMIT WRITING 13.4.1 Duties of the Hot Work Permit Writer The person who writes the Hot Work Permit is responsible for determining if acceptable working conditions exist. The permit writer is responsible for the following duties: • Shall know the hazards of the specific Hot Work task. • Shall know the locations and properties of all flammable and combustible materials.MSDS are good resources for deter- mining the properties of these materials. • Shall communicate effectively with operators of the site and other contractors or personnel who may be affected by the Hot Work. • Shall verify by checking that the permit is complete,including testing and specified equipment in place,before endorsing the permit. • Terminate the permit when the work is complete,or when conditions not allowed under the permit arise.