API MPMS 2.2D:2003(R2009) pdf download.Manual of Petroleum Measurement Standards Chapter 2—Tank Calibration
The method described in this part of API MPMS Chapter 2 is an alternative to other tank calibration methods such as the strapping method (API MPMS Chapter 2, Section 2A), the optical-reference-line method (API MPMS Chapter 2, Sec- tion 2B) and the optical-triangulation method (API MPMS Chapter 2.2C). The parts of Chapter 2 form part of a series on tank calibra- tion which also includes: Standard 2551, Measurement and Calibration of Horizontal Tanks; Standard 2552, Measure- ment and Calibration of Spheres and Spheroids; Standard 2554, Measurement and Calibration of Tank Cars ; Standard 2555, Liquid Calibration of Tanks; Recommended Practice 2556, Correcting Gauge Tables for Incrustation; MPMS Chapter 7, Calibration of Barge Tanks; MPMS Chapter 2.8A, Calibration of Tanks on Ships and Oceangoing Barges; MPMS Chapter 2.8B, Establishment of the Location of the Reference Gauge Point and the Gauge Height of Tanks on Marine Tank Vessels.
1 Scope
1.1 This part speciÞes a method for the calibration of upright cylindrical tanks having diameters greater than 5 m by means of internal measurements using an electro-optical distance-ranging instrument, and for the subsequent compila- tion of tank capacity tables. This method is known as the internal electro-optical distance-ranging (EODR) method. 1.2 This part of Chapter 2 is not applicable to the calibra- tion of abnormally deformed (e.g. dented) tanks or of noncir- cular tanks. 1.3 This part of Chapter 2 is applicable to tanks tilted by < or = 3 % from the vertical, provided a correction is applied for the measured tilt as described in Chapter 2.2A. 1.4 This part of Chapter 2 is applicable to tanks with cone- up or cone-down bottoms, as well as to tanks with ßat bot- toms.
5 Equipment
5.1 ELECTRO-OPTICAL DISTANCE-RANGING INSTRUMENT
5.1.1 The angular measuring part of the instrument shall have an angular graduation and resolution equal to or better than ± 0.0002 gon*, a repeatability equal to or better than ± 0.0005 gon, and an uncertainty equal to or better than ± 0.001 gon. 2 . 5.1.2 The distance-measuring part of the instrument, used for direct determination of the distances, shall have a gradua- tion and resolution equal to or better than ± 1 mm, a repeat- ability equal to or better than ± 2 mm, and an uncertainty equal to or better than ± 2 mm. 5.2 INSTRUMENT MOUNTING consisting of a tripod which is Þrm and stable. The legs of the tripod shall be held Þrm, and steadied by suitable devices such as magnetic bearers. 5.3 LASER BEAM EMITTER having a low-power laser beam complying with IEC 825, which is either an integral part of the EODR instrument or a separate device. If the laser beam emitter is a separate device, it may be Þtted with a Þber optic light transmitter system and a theodolite telescope eye- piece connection, by which the laser beam may be transmit- ted through a theodolite, or such that it may be Þtted to a theodolite with its axis parallel to the axis of the theodolite. The laser beam may be coincident with the optical axis of the telescope Note 1: The laser beam emitter is used to position target points on the tank shell. 5.4 STADIA a rigid bar, usually 2 m long, such that the graduated length between the two stadia marks remains con- stant to within ± 0.02 mm.
API MPMS 2.2D:2003(R2009) pdf download
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