ABSTRACT
Hang Fire: An unplanned delayed ring of explosives after the initiation attempt-various causes. Hanging Wall Block: The body of rock that lies above an inclined fault plane. Hang Rods: Suspending sucker rods in the derrick from rod hangers. HAP: Hazardous air pollutant. Harbor Dues: Various local charges against all seagoing vessels entering a harbor, to cover maintenance of channel depths, buoys, lights, etc.; not all harbors assess this charge. Hard Aground: A vessel that has gone aground and is incapable of re¤oating under her own power. Also referred to as hard and fast. Hardness (Metal): Measure of the resistance encountered in pressing a steel ball into the metal. Hardness (Mineral): The resistance of a mineral to scratching. Determined by the Mohs scale. Hardness (Water): Ion content of water. Hardpan: The relatively hard layer of soil just below ground surface. Hard Shut-In: To close in a ¤owing well with the BOP with the choke line closed. Hard Water: Water with a high mineral content. Hatch: The opening on a tank. HAZ: See Heat-affected zone. Hazard: (1) A condition or object that has the potential to cause harm risk is the probability of an event happening times the impact of its occurrence on operations. (Impact is the effect on conditions or people if the hazard is realized (occurs) in practice and potential is the likelihood that the impact will occur.) (2) An unsafe condition, which, if not eliminated or controlled, may cause injury, illness, or death. Hazard Communication: Employee “right-to-know” legislation requires employers to inform employees (pretreatment inspectors) of the possible health effects resulting from contact with hazardous substances. At locations where this legislation is in force, employers must provide employees with information regarding any hazardous substances, which they might be exposed to under normal work conditions or reasonably foreseeable emergency conditions resulting from workplace conditions. OSHA’s Hazard Communication Standard (HCS) (Title 29 CFR Part 1910.1200) is the federal regulation and state statutes are called Worker Right-to-Know Laws. Also see “Community Right-to-Know” and “SARA.” Hazard Communication Program: A written plan to manage the hazards associated with the use of chemicals in the workplace. Hazardous Chemical: A substance that may harm the worker either physically (e.g., re, explosion) or chemically (e.g., toxic, corrosive). HAZID/HAZOP: HAZard IDentication/HAZard and OPerability analysis systematic design review methods to identify and address hazards to ensure that the necessary safety measures to eliminate or mitigate hazards are incorporated in the design and operation of the unit.
