ASSESSING THE IMPACT OF MEASUREMENT UNCERTAINTY IN CUSTODY TRANSFER TO THE DEVELOPMENT OF OIL & GAS INDUSTRY IN TANZANIA

Ishigita Lucas Shunashu, Respickius Casmir

Abstract


This paper examined the best practise in custody transfer for oil and gas to supporting the development of economy and energy industry, as well as achieving competitiveness in the national and international energy market. The research examined and compared the performance as well as economic efficiently of both manual tank gauging (static tank measurement) and fiscal metering system (dynamic measurement) for oil and gas custody transfer. Tank inventory custody transfer namely Manual Tank Gauging (MTG) and Automatic Tank Gauging (ATG) as well as the Fiscal metering system were all studied. The performances of both tank inventory or tank gauging and fiscal metering system in custody transfer were established by evaluating their respective measurement uncertainty budgets. Both methods were experimentally tested by using field data which were collected from the petroleum products shore tanks and pipeline. Whilst the advantages of fiscal metering system over the imperial manual tank gauging were assessed using measurement uncertainty, and its effect on accounting the accuracy, the product loses the environment and worker’s safety. The results obtained from this study proves that the uses fiscal metering system (FMS) in custody transfer has minimum measurement uncertainty compared to tank gauging, and that FMS has better accuracy five times other than the manual tank gauging (MTG). Therefore, this paper recommends FMS as an effective method in course of transfer of oil and gas from ship to shore tank, from lease tank to ship, from shore tank to rail/road tankers.

Keywords


Custody transfer, measurement uncertainty, oil and gas, fiscal metering, tank gauging, energy industry and economy

Full Text:

PDF

References


AGA-7. (1996). [American Gas Association] AGA 7, Turbine Gas Flow meter.

AGA-8. (2003). Compressibility Factors of Natural and Other Related Hydrocarbon Gases.

AGA Report No 9. (2007). Measurment of Gas by Multipath Ultrasonic Meters., (Second Editon), 16.

API-10.3. (2007). Determination of Water and Sediment in Crude Oil by the Centrifuge Method (Laboratory Procedure), c(April 2004), 33–50.

API-18.2. (2005). API MPMS Chapter 18 . 2 Custody Transfer of Crude Oil from Lease Tanks Using Alternative Measurement Methods.

API-MPMS. (2014). API Manual for Petroleum Measurement Standard, Chapter 3., 49–71.

Aramco. (2013). Custody Measurement Manual for Static Measurement.

Ash, S. (2014). MEASUREMENT ACCURACY AND SOURCES OF ERROR IN TANK GAUGING, m(4), 325–329.

Bernard Spilsbury & Herman Hofstede. (2016). Uncertainties in Shore Tank Measurement.

Bush, D., Sales, F. P., & Neots, S. (1995). Tank gauging : what is it and how is it applied ?, 28(August), 173–175.

Chunovkina, A. G. (2000). Measurement error , Measurement Uncertaunty and Measurand Uncertainty, 43(7), 19–23.

Emerson. (2016). Best Practices for Custody Transfer, using API MPMS 18.2.

Emerson. (2017). The Engineer ’ s Guide to Tank Gauging, 45.

EMPIR 2018. (2018). Traceability of automatic level gauges in fuel reservoirs for legal metrology purposes, 1–3.

EURAMET. (2012). Guidelines on the determination of uncertainty in gravimetric volume calibration, c.

Flexim. (2016). Technical specification FLUXUS ® G801 Ultrasonic gas flowmeters for permanent installation in

How to cite this paper: Ishigita Lucas Shunashu and Dr. Respickius Casmir (2020), Paper Title: Assessing the Impact of

Measurement Uncertainty in Custody Transfer to the Development of Oil & Gas Industry in Tanzania. Business

Education Journal (BEJ), Volume IV, Issue I, 11 Pages. www.cbe.ac.tz/bej

hazardous areas, 1–33.

Frøysa, K. (2001). Hand Book for Uncertainty Calculation, Ultrasonic Fiscal Gas Metering Stations.

GIIGNL. (2010). LNG Custody Transfer Handbook.

Gupta, P. (2017). IMPROVING MEASUREMENT UNCERTAINTY TRANSFER MEASUREMENT.

IEA. (2019). World Energy Outlook 2019, 451.

ISO-5168. (2005). Measurement of fluid flow — Procedures for the evaluation of uncertainties, 3.

ISO-6976. (2016). Natural gas-Calculation of calorific value, density, relative density and Webbe indices from compressibility, 2016.

Justervesenet, H. K., Vsl, P. L., & Justervesenet, T. M. (2011). EMRP 2009 Metrology for Liquefied Natural Gas ( LNG ) ENG03 LNG Evaluation uncertainty in transferred LNG volume, (November).

Odina, G., & Cko, A. (2012). Calibration of Tape Measures with Small Measurement Uncertainty, 187–196. https://doi.org/10.2507/daaam.scibook.2012.16

OIML R85. (2001). Tank Gauging Standards, (281), 1–5.

OIML R85. (2008). Automatic level gauges for measuring the level of liquid in stationary storage tanks Part, 2008, 1–49.

Rosemount. (2017). Rosemount TM 3051 Pressure Transmitter, (May).

Upp, E. L., & LaNasa, P. J. (2014). Fluid Flow Measurement: A Practical Guide to Accurate Flow Measurement. Engineering, 275. https://doi.org/10.1016/0955-5986(90)90020-8

Viana, F., George, D. L., Ph.D., Owston, R. A., Supak, K. R., Hawley, A. G., & Ufford, A. (2012). Production verification enhancement, (18), 17. https://doi.org/M1JPC00026


Refbacks

  • There are currently no refbacks.


Copyright (c) 2020 Business Education Journal