API 1604 2021 pdf download

API 1604 2021 pdf download.Closure of Underground Petroleum Storage Tanks.
1 Scope 1.1 Scope This recommended practice covers procedures for the closure in place, removal, storage, and of-site disposal of underground storage tank (UST) systems that have contained petroleum liquids. In general, it outlines requirements, procedures, and operating conditions to be followed by contractors, engineers, and other individuals who may be involved in these practices. While this recommended practice specifcally addresses underground petroleum storage tank systems at service station facilities, the principles outlined may be applied to similar systems used at other petroleum storage facilities. In addition, the principles may be applied to specialized chemicals not specifcally addressed by this recommended practice, taking into account the appropriate diferences in physical, chemical, and human and environmental efects that may be hazardous. 1.2? UST? Systems,? as? Defned? by? Federal? Regulations Under applicable federal regulations, including 40 CFR Part 280, a UST system consists of the UST and the connected underground piping, underground ancillary equipment, and containment system, if any. The procedures outlined in this recommended practice can be applied to all portions of an UST system. 1.3? If? Tank? Entry? is? Required The procedures outlined in this recommended practice should be performed without entering the tank. If tank entry is required, the procedures outlined in NFPA 326, API Standard 2015, API Recommended Practice 1631, and API Publication 2217A should be followed (see also 29 CFR Part 1910.146 regarding “Permit required confned space”). 2? Normative? References The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any addenda) applies. 3? Terms? and? Defnitions For the purposes of this document, the following defnitions apply. 3.1 approved Acceptable to the authority having jurisdiction. 3.2 authority having jurisdiction (AHJ) An organization, ofce, or individual responsible for enforcing the requirements of a code or standard, or for approving equipment, materials, an installation, or a procedure. 3.3 change of service Conversion of the UST to storage of a non-regulated substance. 3.4 clean (cleaning) The removal of all product, vapor, sludge, and residue from a tank, and washing, rinsing, and drying a tank so that no product or residue remains on any tank surfaces (shell, bottom, piping, appurtenances, etc.). 3.5 combustible? gas? indicator An instrument used to sample the atmosphere to indicate if any fammable (combustible) vapors/gases are present; determine the composition of hydrocarbon gas and air mixtures; and indicate the concentration of vapor/ gas present in the atmosphere as a percentage of the lower explosive (fammable) limit (LEL). 3.6 degassing The process of collecting, oxidizing, or treating vapors and gases expelled from an underground tank to prevent or reduce the amount of organic volatile compounds released into the atmosphere during vapor-freeing operations. 3.7 empty (emptied) A tank that has no (standing) product remaining in the tank and is ready for vapor freeing and cleaning. 3.8 explosive? (fammable)? range The range of concentrations of fammable vapor-in-air, between the lower explosive (fammable) limit (LEL) and the upper explosive (fammable) limit (UEL), that will propagate fame if ignited.
4? Compliance? with? Regulations? and? Safety? Considerations 4.1? Compliance? with? Regulations? and? Standards 4.1.1 The closure in place, removal, storage, and of-site disposal of UST systems that have contained fammable or combustible fuids shall be accomplished in accordance with federal, state, and local requirements, this recommended practice, and accepted safety standards. 4.1.2 Before initiating work, the authority having jurisdiction (AHJ) should be notifed and consulted concerning applicable regulatory and permit requirements. 4.1.3 All applicable permits shall be obtained prior to beginning any work. Certifed or licensed contractors may be required in some states. Consult the AHJ for contractor requirements. Contractors, subcontractors, and their employees responsible for tank closure in place or removal shall be familiar with the following: a) all applicable safety rules and regulations, including OSHA’s Occupational Safety and Health Standards (Title 29 CFR Part 1910); b) the use of equipment and procedures for testing and vapor-freeing tanks; c) the handling and disposal of the types of wastes likely to be encountered; and d) the applicable sections of the publications referenced in Section 2. 4.2 Special Precautions During UST removal or closure in place, workers may be exposed to petroleum hydrocarbon liquids, vapors, or wastes. The precautions in 4.2.1 and 4.2.2 should be observed by all individuals engaged in the procedures discussed in this recommended practice. 4.2.1? Toxicity? Considerations? for? Petroleum? Substances 4.2.1.1 General All personnel involved in the work shall be aware of appropriate health and safety precautions. When high concentrations of petroleum hydrocarbon vapors are inhaled, symptoms of intoxication may result. These symptoms, ranging from dizziness to excitement or unconsciousness, are similar to those produced by alcohol or anesthetic gases. If such efects occur, the individual shall be removed to fresh air.