API St 1631-2010 pdf download.Interior Lining and Periodic Inspection of Underground Storage Tanks.
1 General 1.1 SCOPE This standard provides minimum recommendations for the interior lining of existing steel and Þberglass reinforced plas- tic underground tanks and periodic inspection of steel under- ground tanks used for the storage of petroleum-based motor fuels and middle distillates. These recommendations include procedures to be followed and operating conditions to be maintained by contractors, workers and engineers preparing, inspecting, testing and lining the interiors of existing under- ground storage tanks. Requirements for vapor-freeing tanks, removing sediment and cleaning interior surfaces of steel and Þberglass tanks as well as guidelines to identify tanks that are suitable for lining, are also included. All work associated with the interior lining and periodic inspection of underground storage tanks shall be accomplished in accordance with appli- cable federal, state, and local regulations, including applica- ble environmental and safety requirements. 1.2 APPLICABILITY The methods described in this standard are applicable to steel and Þberglass-reinforced plastic tanks used for the stor- age of petroleum-based motor fuels and middle distillates. The procedures are applicable to tanks installed in typical retail service station outlets but may also be used for tanks installed at other types of facilities. 1.3 EPA TECHNICAL STANDARDS The U.S. Environmental Protection Agency (EPA) issued its Technical Standards and Corrective Action Requirements for Owners and Operators of Underground Storage Tanks (UST) (herein referred to as ÒTechnical StandardsÓ) in 1988. These regulations can be found in the Code of Federal Regu- lations at 40 CFR Part 280. In addition, legislation and regu- lations on all aspects of underground storage tank management have been developed by state and local jurisdic- tions that may have requirements other than those speciÞed in the EPA Technical Standards.
2 References 2.1 GENERAL The following government regulations and standards and industry and consensus standards, codes, and publications ref- erenced herein* provide information related to safe entry, vapor freeing, ventilation, cleaning, lining and inspection of underground petroleum storage tanks. While this standard is intended to be consistent with applicable codes and standards in effect at the time of publication, the most recent edition of each regulation, code, standard or publication that is applica- ble, should be consulted, as appropriate, to assure compliance.
3.2 DEFINITIONS 3.2.1 air supplied respirators: A respirator that pro- vides a supply of safe breathing air from a tank (either a self contained breathing apparatus portable tank or an air line sup- ply tank) or from a source of fresh air (approved breathing air compressor) not subject to potential contamination. 3.2.2 attendant: A qualiÞed employee stationed outside one or more permit required conÞned spaces who monitors the entrants and who performs all attendantÕs duties in accor- dance with the employerÕs (owner/operator and contractor) permit required conÞned space program. Attendants may also perform the duties of standby personnel when entrants use respiratory protective equipment. 3.2.3 bonding: The joining of metal parts to form an elec- trically conductive path that ensures electrical continuity and has the capacity to safely conduct any current likely to be generated. (See alternate deÞnition, Ò bond Ó). 126.96.36.199 bond: The adhesion of the lining to the metal sur- face of the tank. 3.2.4 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.). 3.2.5 combustible gas indicator: An instrument used to sample the atmosphere to indicate if any ßammable (com- bustible) vapors/gases are present, determine the composition of hydrocarbon gas and air mixtures and indicate the concen- tration of vapor/gas present in the atmosphere as a percentage of the lower explosive (ßammable) limit (LEL).