API St 1631:2010 pdf download
API St 1631:2010 pdf download.lnterior Lining and Periodic Inspection of Underground Storage Tanks.
3.2.7.1 permit-required confined space: A confined space that meets all three of the confined space requirements and also has one or more of the following four characteristics:
• Contains or has the potential to contain a hazardous atmosphere.
• Contains a material with the potential to engulf an entrant.
• Has an internal configuration such that an entrant could become trapped or asphyxiated by inwardly converging walls or by floors that slope downward, tapering to smaller cross-sections.
• Contains any other recognized serious safety or health hazard.
3.2.7.2 non-permit required confined space: A confined space (a space that meets all three of the confined space characteristics) but has been checked and inspected and its atmosphere has been monitored and it does not have (or does not have the potential to have) any of the characteristics required to be classified as a permit required confined space.
3.2.8 degassing: The process of collecting, oxidizing or treating vapors and gases expelled from an underground tank so as to prevent or reduce the amount of organic volatile compounds released into the atmosphere during vapor freeing operations.
3.2.9 electrical division classification of hazardous (classified) locations: The division classification system is used to designate locations where fire or explosion hazards may exist due to the potential for the presence of flammable gases, vapors or liquids.
Note: These classifications are identical to those defined by NFPA 70, Thc National Electric Code.
3.2.9.1 Class I, Division 1: A location wherein any one of the following conditions applies:
• Ignitable concentrations of flammable gases or vapors exist under normal operating conditions.
• Ignitable concentrations of flammable gases or vapors may exist frequently because of repair or maintenance operations or because of leakage.
• Ignitable concentrations of flammable gases or vapors might he released by breakdown or faulty operation of equipment or processes that might cause electrical equipment to simultaneously fail in such a manner as to become a source of ignition.
3.2.9.2 Group D Location: A division classified location wherein a specific level of protection is required for flammable and combustible liquid vapor or gas that may burn or explode when mixed with air and exposed to a specific ignition source.
3.2.9.3 Group A, B and C Locations: Some petrochemical products require higher levels of protection than Group D, including, hut not limited to. acetylene (Group A), hydrogen (Group B) or ethylene (Group C) (see NFPA 70, Article 500. Hazardous Classified Locations, and NFPA 30, Flammable and Combustible Liquids, for additional information).
3.2.10 electrical zone classification of hazardous (classified) locations: the zone classification system is an alternate system (to division classification) for locations where fire or explosion hazards may exist due to flammable gases. vapors or liquids.
3.2.10.1 Class I, Zone 0 Location: is a location wherein either of the following conditions apply:
• Ignitable concentrations of flammable gases or vapors arc present continuously
• Ignitable concentrations of flammable gases or vapors are present for long periods of time.
3.2.10.2 Class I, Zone 1 Location: is a location wherein any of the following conditions apply:
• A location where ignitable concentrations of flammable gases or vapors are likely to exist under normal operating conditions.
• A location where ignitable concentrations of flammable gases or vapors may exist frequently because of repair or maintenance operations or because of leakage.
• A location where equipment is operated or processes conducted in such a manner that breakdown or faulty operations could result in a release of ignitable concentrations of flammable gases or vapors and simultaneously cause failure of equipment so as to create a source of ignition.
• A location that is adjacent to a Class I, Zone 0 location from which ignitable concentrations of flammable gases or vapors could be communicated unless such communication is prevented by adequate positive pressure ventilation from a source of clean air and eflctive safeguards against ventilation failure are provided.
3.2.11 emergency: Any occurrence or event (including. but not limited to, failure of hazard control or monitoring equipment) internal or external to a confined space, that could endanger entrants or negatively impact on the tank lining operation.
3.2.12 employer: An owner, operator. contractor or subcontractor whose respective employees are performing a task or activity described in this standard.
3.2.12.1 owner/operator: The company or person responsible for the facility in which the tank to be lined is located.
3.2.1 2.2 contractor: A company or person selected and hired by the owner/operator to conduct tank lining operations and activities in accordance with the contract and tank lining.
