Custody Transfer Temperature Measurement API MPMS …

1 Custody Transfer Temperature Measurement API MPMS Chapter 7 Temperature Measurement Standards Overview Presented at 2012 API Asia Conference and Expo March 6-8, 2012. Dr. William J. Schmidt, II. Director Commercial Measurement & Loss Control ConocoPhillips Company Agenda API Committee on Measurement Quality (COMQ). Introduction To Temperature Measurement Custody Transfer Requirements Temperature Measurement Standards (API MPMS Chapter 7). Mercury-In-Glass Thermometers Summary Questions & Answers (Q&A). 2. API Committee on Measurement Quality 3.

2 API Committee on Measurement Quality As a subcommittee of the Committee on Petroleum Measurement (COPM), COMQ. develops, approves, and maintains standards pertaining to Measurement quality of hydrocarbons, including: Temperature Determination, MPMS Chapter 7. Sampling, MPMS Chapter 8. Density Determination, MPMS Chapter 9. Sediment & Water Determination, MPMS Chapter 10. Physical Properties, MPMS Chapter 11. Truck Gathering, MPMS Chapter 18. Joint committee with ASTM International through ASTM Committee D02 as COMQ provides representation on the International Organization for Standardization (ISO) Technical Committee (TC) 28 - Subcommittee (SC) 6, Bulk Cargo Transfer , Accountability, Inspection and Reconciliation.

3 4. Introduction To Temperature Measurement 5. Introduction to Temperature Measurement Crude oil and petroleum products are typically sold based on fluid properties at Standard ( Reference ) Temperature and Pressure conditions. Temperature has the most significant effect on the accurate determination of liquid quantities when correcting to Standard Conditions (Volumetric Correction Factor). Therefore: The most accurate means for Temperature Measurement should be used for these Custody Transfer applications. Introduction to Temperature Measurement Contracts reference standards to be used in Custody Transfer , which specify Temperature Measurement equipment, location, and required accuracy.

4 Regulatory agencies also reference the same standards for use in determining royalties, taxes, and regulatory compliance. Buyers and Sellers negotiate the appropriate standards to be used in the development of contracts for Custody Transfer . Introduction to Temperature Measurement Temperature Measurement standards are written for: Fluids under static conditions. Fluids under dynamic conditions. Standards cover Temperature Measurement for: Selection of equipment types and equipment usage. Volumetric Custody Temperature Measurement .

5 Calibration of volumetric Measurement devices. Calibration of other Temperature Measurement devices. Use in quality analysis (QA). Custody Transfer Requirements 9. Custody Transfer Requirements Static liquid hydrocarbon Temperature Measurement Static vessels: Storage tanks, gathering tanks. Ships, tankers, and barges. Tank cars and rail cars Can provers. Dynamic liquid hydrocarbon Temperature Measurement Dynamic vessels: Pipes. Pipe Provers. Custody Transfer Requirements Static and dynamic Temperature Measurement Objective: find average Temperature representative of bulk.

6 Manual method: Mercury-In-Glass Thermometers (MIGTs). Portable Electronic Thermometers (PETs). Automatic method: Fixed electronic sensors Automatic Tank Thermometer elements (ATTs). Custody Transfer Requirements Performance of Temperature Measurement (Accuracy). determined by a variety of standards: Calculation standard (API MPMS Chapter 12). Density determination standards (API MPMS Chapter 9). Sediment and Water determination standards (API MPMS Chapter 10). Proving standards (API MPMS Chapter 5). Tank gauging standard (API MPMS Chapter 3).

7 Tank calibration standard (API MPMS Chapter 2). Metering standards (API MPMS Chapter 5). Gathering standard (API MPMS Chapter 18). Temperature Measurement Standards 13. Temperature Measurement Standards Currently, MPMS Chapter 7 contains all Temperature Measurement information organized as sections in one document. Equipment and apparatus. Static Temperature Measurement . Dynamic Temperature Measurement . Calibration, Verification, and Inspection. Ongoing effort to reorganize current document into stand-alone standards: Section 1 Liquid-In-Glass Thermometers.

8 Section 2 Portable Electronic Thermometers (PETs). Section 3 Fixed Automatic Tank Systems (PUBLISHED 9/2011). Section 4 Dynamic Temperature Measurement . 14. Temperature Measurement Standards Equipment and apparatus section. Fixed automatic tank thermometers. Portable electronic thermometers (PETs). Glass thermometers. Electronic Temperature devices. Thermowells. Data Collection, transmission, receiving equipment. Temperature Measurement Standards ASTM Thermometers ASTM. Name Thermometer Range Length (inches) Graduation Accuracy ASTM tank 58F-80 - 30 F to +120 F 12 1 F F.

9 ASTM tank 97F-80 0 F to 120 F 12 1 F F. ASTM tank 59F-80 0 F to180 F 12 1 F F. ASTM tank 98F-80 60 F to180 F 12 1 F F. ASTM tank 60F-80 170 F to 500 F 12 2 F F. Angle-stem Suitable range 12a 1 F F. Tank thermometerb 20 F to 220 F 12 1 F F. Note: Except for the angle-stem thermometer, all thermometers listed in this table are the total-immersion type. Portable Electronic Thermometer Specifications Minimum Graduation Accuracy Range of Required Accuracy F F 0 200 F. F > 200 F. C C 0 100 C. C > 100 C. Note 1: The specifications in this table represent minimum acceptable accuracy for portable electronic thermometers used for Custody Transfer .

10 Thermometers with better accuracy are available and may be specified by mutual agreement. Note 2: PETs shall be provided with displays that provide a resolution of C or F or better. Temperature Measurement Standards Static Temperature determination section. Ambient Temperature . Timing of Temperature Measurement . Fixed automatic tank thermometers. Portable electronic thermometers. Mercury-in-glass thermometers. Temperature Measurement Standards Comparison of Recommended Immersion Times for PETs and Woodback Cup-Case Assemblies -------------------------------------- Recommended Immersion Times (minutes) ---------------------------------------- ------ Electronic Thermometer ------------------------------ Woodback Cup-Case Assembly --------------------------------------- When Temperature Differential < C (< 5 F).