© 2012 delmar, cengage learning chapter 9 safety permit systems
TRANSCRIPT
© 2012 Delmar, Cengage Learning
Chapter 9Safety Permit Systems
© 2012 Delmar, Cengage Learning
Types of Permits
• Each plant has its own permitting system.
• Three permits common in the industry:• The control of hazardous energy• Confined space entry• Hot work
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Hot Work Permits
• Hot work is any maintenance procedure that produces a spark or excessive heat, or requires welding or burning.
© 2012 Delmar, Cengage LearningFigure 9-1 Example of a Hot Work Permit
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Confined Space Entry
• A confined space is defined as a space large enough so a person can enter, has restricted entry, and is not designed for continuous occupancy.
• Additional permits are required for hot work, cold work, opening/blinding, or energy isolation inside the enclosed space.
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Figure 9-3 Confined Space Entry
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Confined Space Entry Team
• The team is composed of an entry supervisor, a standby or attendant, and an entrant.
• Each member of the team will have specific training prior to performing confined space work.
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Control of Hazardous Energy• The purpose of the hazardous energy
standard is to protect employees from the hazards associated with the accidental release of uncontrolled energy.
• The are seven basic forms of energy in the industry: electrical, pneumatic, hydraulic, compressed gas and liquids, gravity, and spring tension.
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Figure 9-4 Lockout/Tagout Permit
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Six Steps for Locking Out Equipment
• Prepare for shut down• Shut down of the equipment• Isolation of equipment• Application of lockout/tagout devices to
breakers and disconnect switches, valves, and energy-isolating devices.
• Control of stored energy• Verification step
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Figure 9-5 Pump-around System
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Opening or Blinding Permits
• The purpose of the opening or blinding permits to limit accidents through improved communications and structured guidelines for removing blinds, installing blinds, or opening vessels, lines, and equipment.
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Figure 9-6 Opening or Blinding Permit
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Figure 9-7 Opening or Blinding a Vessel
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Routine Maintenance Permits
• The routine maintenance permit system is designed to prevent accidents by improving communications between process technicians and the mechanical craftsperson doing the mechanical work.
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Figure 9-8 Example of a Routine Maintenance Permit