© 2019 Department of Petroleum Resources. All rights reserved Department of Petroleum Resources (DPR) PROCEDURE GUIDE

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2.3.6 Presentation of Results ........................................................................................ 65 
2.4 Calibration of Metal Tapes ...................................................................................... 66 
2.4.1 Accreditation ........................................................................................................ 66 
2.4.2 Principle ............................................................................................................... 66 
2.4.3 Frequency of Calibration ...................................................................................... 66 
2.4.4 Applicable Standard ............................................................................................. 66 
2.4.5 Verification and Calibration ................................................................................. 66 
2.4.6 Presentation of Results ........................................................................................ 66 
2.5 Calibration of Vertical Cylindrical Tanks ................................................................. 66 
2.5.1 Accreditation ........................................................................................................ 66 
2.5.2 Principle ............................................................................................................... 66 
2.5.3 Frequency of Calibration ...................................................................................... 67 
2.5.4 Applicable Standard ............................................................................................. 67 
2.5.5 General Practices ................................................................................................. 67 
2.5.6 Manual Tank Strapping ........................................................................................ 67 
2.5.6.1 Calibration Equipment ...................................................................................... 67 
2.5.6.3 General Consideration ...................................................................................... 68 
2.5.6.3.4 Deadwood ...................................................................................................... 68 
2.5.7 Electro-Optical Distance-Ranging method........................................................... 68 
2.5.7.1 Calibration Equipment/instrument .................................................................. 68 
2.5.7.2 Calibration Procedure ....................................................................................... 68 
2.5.8 Presentation of Result ......................................................................................... 69 
2.5.8.1 Field Data .......................................................................................................... 69 
2.5.8.2 Calibration Chart ............................................................................................... 70 
2.5.9 Optical Reference Line Method (ORLM) .............................................................. 71 
2.5.10 Optical Triangulation Method: .......................................................................... 71 
2.5.11: General Consideration ...................................................................................... 71 
2.6    Calibration of Horizontal Storage Tanks .............................................................. 71