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API RP 49-2001 pdf free download

API RP 49-2001 pdf free download.Recommended Practice for Drilling and Well Servicing Operations Involving Hydrogen Sulfide.
0 Introduction The petroleum industry, through many years of research and operating experience, has developed guidelines and stan- dards for safe operations under conditions involving hydro- gen sulÞde. Continuing industry efforts, which include planning, prudent selection and layout of equipment, prudent selection of materials, operating and emergency procedures, specialized safety equipment, and appropriate personnel training, have contributed to successful and safe operations. Effective response to emergencies requires prior planning. Good engineering practice (engineering and administrative controls) dictates that operations systems be designed to min- imize exposure of personnel and the public to hydrogen sul- Þde and sulfur dioxide. 1 Scope Recommendations set forth in this publication apply to oil and gas well drilling and servicing operations involving hydrogen sulÞde. These operations include well drilling, completion, servicing, workover, downhole maintenance, and plug and abandonment procedures conducted with hydrogen sulÞde present in the ßuids being handled. Coverage of this publication is applicable to operations conÞned to the original wellbore or original total depth and applies to the selection of materials for installation or use in the well and in the well drilling or servicing operation(s). The presence of hydrogen sulÞde in these operations also presents the possibility of exposure to sulfur dioxide from the combustion of hydrogen sulÞde. Refer to Section 4 for applicability of this standard. This standard addresses personnel training, personnel pro- tective equipment, contingency planning and emergency pro- cedures, classiÞcation of locations, materials and equipment, operations, rig practices, special operations, offshore opera- tions, characteristics of hydrogen sulÞde and sulfur dioxide, and evaluation and selection of hydrogen sulÞde monitoring equipment.
3.2.9 immediately dangerous to life and health (IDLH): An atmospheric concentration of any toxic, corro- sive, or asphyxiant substance that poses an immediate threat to life or would cause irreversible or delayed adverse health effects or would interfere with an individualÕs ability to escape from a dangerous atmosphere. The ACGIH has estab- lished 300 ppm or greater of H 2 S as an IDLH exposure. 3.2.10 inadequately ventilated: Ventilation (natural or artiÞcial) that is not sufÞcient to prevent the accumulation of signiÞcant 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-of- stain), with a supply of detector tubes, that operates by using the pump to pull a known volume of air or gas through a detec- tor tube. The tubes contain chemical reagents that are designed to detect the presence and display the concentration of speciÞc gases or vapors in the sample. The length of the resultant color band in the tube indicates an instantaneous quantitative con- centration of the speciÞc chemical in the sample. 3.2.12 permissible exposure limit (PEL): TWA con- centrations 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 Òrecommended practice(s)Ó has universal applicability to that speciÞc 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 Òrecommended practice(s)Ó 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.

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