API RP 49:2001 pdf download

API RP 49:2001 pdf download.Recommended Practice for Drilling and Well Servicing Operations Involving Hydrogen Sulfide.
3.2 DEFINITIONS
For the purposes of this standard, the following definitions are applicable.
3.2.1 acceptable ceiling concentration (ACC): The
designated level of an air contaminant to which an employee may be exposed at any time during an 8-hour shift, except for a time period and up to a concentration not exceeding the “acceptable maximum peak above the acceptable ceiling concentration for an 8-hour shift”.
3.2.2 action levels: The levels at which the possibility of hydrogen sulfide atmospheric concentrations greater than 10 ppm or sulfur dioxide atmospheric concentrations greater than 2 ppm may bc encountered.
3.2.3 breathing zone: Generally, a hemisphere forward of the shoulders with a radius of 6 in. to 9 in.
3.2.4 continuous hydrogen sulfide monitoring equipment: Equipment capable of continuously measuring and displaying the concentration of hydrogen sulfide in ambient air.
3.2.5 enclosed facility: A three-dimensional space enclosed by more than 2/3 of the possible projected plane surface and of sufficient size to allow the entry of personnel. For a typical building, this would require that more than 2/3 of the walls, ceiling, and floor be present. Refer to API RP 500 and RP 505.
3.2.6 essential personnel: Those individuals required to provide proper and prudent safe operations activities and those required to etTect control of the hazardous hydrogen sulfide or sulfur dioxide conditions.
3.2.7 gas detection instrument: An assembly of electrical, mechanical, and chemical components designed to sense and respond continuously to the presence of chemical gases in atmospheric mixtures.
3.2.8 hydrogen sulfide: Chemical formula is H2S. A flammable, toxic gas that is heavier than air and sometimes found in fluids encountered in oil and gas producing and gas processing operations.
3.2.9 immediately dangerous to life and health (IDLH): An atmospheric concentration of any toxic, corrosive, or asphyxiant substance that poses an immediate threat to life or would cause irreversible or delayed adverse health effects or would interfere with an individual’s ability to escape from a dangerous atmosphere. The ACGIH has established 300 ppm or greater of H,S as an IDLH exposure.
3.2.10 inadequately ventilated: Ventilation (natural or artificial) that is not sufficient to prevent the accumulation of significant quantities of toxic or inert gases such that a hazard is created.
3.2.11 length-of-stain detector: A specially designed pump and colorimetric indicator tube detector (length-ofstain), with a supply of detector tubes, that operates by using the pump to pull a known volume of air or gas through a detector tube. The tubes contain chemical reagents that are designed to detect the presence and display the concentration of specific gases or vapors in the sample. The length of the resultant color band in the tube indicates an instantaneous quantitative concentration of the specific chemical in the sample.
3.2.12 permissible exposure limit (PEL): TWA concentrations that must not be exceeded during any 8-hour work shift of a 40-hour work week. PELs are subject to change.
3.2.13 shall: Indicates the “recommended practice(s)” has universal applicability to that specific activity.
3.2.14 shelter-in-place: The concept of providing the public protection from exposure to toxic gas or vapor releases to the environment by having residents stay indoors until emergency evacuators arrive or the emergency is over.
3.2.15 short term exposure limit (STEL): A 15- minute TWA exposure that should not be exceeded at any time during a workday.
3.2.16 should: Denotes a “recommended practice(s)” 1) where a safe comparable alternative practice(s) is available; 2) that may be impractical under certain circumstances; or 3) that may be unnecessary under certain circumstances.
3.2.17 special operations: any service performed on or in a well other than the normal drilling or service operations that are accomplished in their entirety by a drilling or servicing rig.
3.2.18 sulfur dioxide: Chemical formula is SO.. A toxic product of combustion of hydrogen sulfide, normally heavier than air.
CAUTION: Inhalation at certain concentrations can lead to injury or death. Refer to Appendix B.
3.2.19 temporary safe haven: Refer to “shelter-inplace” (3.2.14).