API RP 2217A-2017 pdf download.Safe Work in Inert Confined Spaces in the Petroleum and Petrochemical Industries.
3.9 immediately dangerous to life or health IDLH Inert atmospheres are considered to be “IDLH” as total loss of respiratory protection in an inert atmosphere can cause virtually immediate impairment and result in rapid asphyxiation. 3.10 inert entry Entry into an inert confined space starts as soon as any part of the entrant’s body breaks the plane of an opening into the space and triggers the need for rescue capability. “Inert entry” includes all activities within the inert confined space. 3.11 inerting The displacement of the atmosphere in a permit required confined space by a non-combustible gas (such as nitrogen) to such an extent that the resulting atmosphere is noncombustible or non-toxic. 3.12 lower flammable limit LFL The lowest volume concentration of a gas or vapor that when mixed with air and exposed to a source of ignition will result in a fire or explosion. In popular terms, a mixture containing a percentage of flammable gas or vapor below the LFL is considered to be too lean to burn. 3.13 safety data sheet SDS Written or printed information that provides data on physical properties, safety, fire, and health hazards for a particular chemical, mixture, or substance and is prepared in accordance with applicable regulatory requirements. 3.14 oxygen-deficient atmosphere An atmosphere in which the oxygen content is below that needed for normal human function without impairment. 3.15 entry permit An entry permit is a written or printed document provided by the authorizing entity to allow and control entry into and work within an inert confined space. 3.16 pyrophoric A material (e.g. iron sulfide, certain catalysts, or certain carbonaceous materials) that, when exposed to air, can spontaneously oxidize and heat, providing a source of ignition if a flammable vapor/air mixture is present. 3.17 risk The probability that a substance or situation will produce harm under specified conditions.
3.19 risk-based analysis Systematic use of available information to determine how often specified events may occur and the magnitude of their consequences. 3.20 upper flammable limit UFL The maximum concentration of a flammable vapor in air (or other oxidant) above which propagation of flame does not occur on contact with an ignition source. In popular terms, a mixture containing a percentage of flammable vapor above the UFL is too rich to burn. 4 CLSM 1 Management Systems and Organization Processes, programs, procedures, organization, and planning to support the effective execution of inert entry work (owner/operator and/or contractor) are required for safe and successful inert entry projects. All personnel must be trained, qualified, and competent to perform assigned tasks. 4.1 Requirements It is a joint responsibility for the owner/operator and contractor to meet the requirements for safe inert confined space entry and work, which include but are not limited to the following. a) The owner/operator identifies approved programs, procedures, permits, forms, and checklists required to conduct inert entry operations safely. b) Methods are established to track and ensure effective transition/communication of the applicable confined space program, the inert entry plan requirements, and job status through the course of work execution. This includes the consistent use of permits, danger tags, warning labels, and other visual cues to help reduce the likelihood of miscommunication across shifts. c) Identify the approved testing equipment, methods, calibration, and recordkeeping requirements, in accordance with manufacturer’s instructions, to be completed for the equipment d) Incorporate in the selection criteria for inert entry Contractor Companies their capability to satisfy the operating company’s requirements, including evidence of the capability to satisfy the CLSMs and associated safeguards identified in this document. e) Experienced (trained and qualified) personnel must be available to at considers