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API 12R1-2021 pdf free download

API 12R1-2021 pdf free download.Installation, Operation, Maintenance, Inspection, and Repair of Tanks in Production Service.
1 Scope 1.1 This standard provides the minimum requirements to install, operate, maintain, inspect, repair, and reconstruct both new and existing tanks used in petroleum production service in a manner that includes best practices for tank facility safety, security, and environmental protection. 1.2 Tanks in refneries, petrochemical plants, marketing bulk plants, and pipeline storage facilities operated by carriers are not within the scope of this standard. 1.3 This standard is intended primarily for application to tanks fabricated to API Specifcations 12B, 12D, 12F, and 12P which are employed in onshore productions services but may be applied to other tanks and services at the discretion of the Owner/Operator. 1.4 Annex G of this standard contains specifc safety information applicable to tanks. For additional safety information, see other publications referenced within this standard. 1.5 The schematic drawings included in this standard are examples of some features described in the standard. Lease automatic custody transfer (LACT) operations are covered in the API Manual of Petroleum Measurement Standards. NOTE A bullet (•) at the beginning of a paragraph indicates that there is an expressed decision or action recommended or required to be addressed by or on behalf of the Owner/Operator. The Purchaser’s responsibility is not limited to these decisions or actions alone. When such decisions and actions are taken, they are to be specifed in documents such as requisitions, change orders, data sheets, and drawings. 2 Normative References The following referenced 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. API Specifcation 12B, Bolted Tanks for Storage of Production Liquids
4? Production? Tank? and? Facility? Design 4.1 Setting of New or Relocated Tanks 4.1.1 The location of tanks should be selected after considering operational needs, carrier requirements, prevailing winds, environmental, and safety conditions, and all local, state, and federal regulations governing such locations. 4.1.2 Tank spacing must comply with applicable local, state, and federal regulations. Requirements are to be included within the scope of work specifed by the Owner/Operator. Tanks should be located in a straight line as shown in Annex F, Figure F.1. The minimum shell-to-shell spacing between tanks shall be 910 mm (3 ft) for personnel access, with spacing adjusted as needed to maintain clearance for piping or other obstruction (see 4.1.3). 4.1.3 If tanks are installed with pipeline connections facing one another, sufcient space shall be provided between tanks to allow safe inspection and operation of valves and other appurtenances. Personnel access to all piping connections for operations, inspection, and maintenance shall be considered in the design. Annex F, Figure F.2 shows examples of small, shop-welded tanks with foundation and connection confgurations. Annex F, Figure F.3A, and Figure F.3B show examples of battery installations with piping confgurations with diked frewalls used. The requirements for barriers, valves, drains, and vents shown in these fgures are defned in more detail in the remainder of this standard. 4.2 Design for Spill Prevention and Containment 4.2.1 Aboveground storage tank facility spill prevention and containment must comply with applicable local, state, and federal regulations, and those requirements are to be included within the scope of work specifed by the Owner/Operator. 4.2.2 A Release Prevention Barrier shall be used for new installations.
4.2.3 Dikes or frewalls shall be constructed as secondary containment to contain not less than the volume of the largest tank enclosed plus at least 10 percent additional tank volume or as required by local regulations (for emergency release containment). The secondary containment area shall be sufciently impervious and be sloped so as to drain any water away from tanks and shall be kept cleared of any accumulations of combustible material, oil, basic sediment, and water. 4.2.4 At the option of the Owner/Operator, a pipe drain may be provided at the lowest point of the secondary containment area to permit draining accumulations of storm water. This pipe drain shall have a locked-closed valve outside the drainage area to ensure proper containment and control of fuids other than storm water. Retained storm water shall be inspected for any oil or produced water contamination prior to any disposal (drainage) process. Facility design provisions shall address control of other substances, such as saltwater, oil, and basic sediment to prevent being spilled within the diked area. 4.2.5 The foundation of a tank shall be designed and installed to: a) support the tank so that it shall remain vertical with a tolerance of plus or minus 2 degrees, b) elevate the tank to drain rainwater away from the base of the foundation and bottom of the tank. 4.2.6 The foundation subgrade shall be well-graded, compacted soil. The subgrade shall be raised at the center of the tank foundation to facilitate drainage toward the perimeter. Surface drainage shall be provided and sloped away from the tank. NOTE See API Standard 650, Annex B for foundation considerations and API 650, Annex I for examples of subgrade protection.

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