API MPMS 7.4 2018 pdf free download

API MPMS 7.4 2018 pdf free download.Manual of Petroleum Measurement Standards Chapter 7—Temperature Determination Section 4—Dynamic Temperature Measurement.
1 Scope This standard describes methods, equipment, installation, and operating procedures for the proper determination of the temperature of hydrocarbon liquids under dynamic conditions in custody transfer applications. This standard describes the accuracy requirement and the calibration of the temperature measurement equipment. This standard does not cover dynamic temperature measurement of refrigerated, light hydrocarbon fluids or cryogenic liquids. 2 Normative References The following standards and other industry publications contain provisions that, through reference in this text, constitute provisions of this standard. All standards are subject to revision, and parties to agreements based on this standard are encouraged to use the most recent editions of the standards indicated below: API Manual of Petroleum Measurement Standards (MPMS) — Chapter 1, Terms and Definitions, http://chapter1.api.org — Chapter 4 (All Relevant Sections), Proving Systems — Chapter 5 (All Relevant Sections), Metering Systems — Chapter 6 (All Relevant Sections), Metering Assemblies — Chapter 7.1, Liquid in Glass Thermometers — Chapter 12.2, Calculation of Liquid Petroleum Quantities Using Dynamic Measurement Methods — Chapter 21.2, Electronic Liquid Volume Measurement Using Positive Displacement and Turbine Meters API Recommended Practice 500, Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I Division 1 and Division 2 API Recommended Practice 2003, Protection Against Ignitions Arising Out of Static, Lighting, and Stray Currents ASME 1 ASME PTC 19.3TW_2016, American National Standard for Thermowells ASTM 2 — ASTM E1, Standard Specification for ASTM Thermometers — ASTM E77, Standard Test Method for Inspection and Verification of Liquid-in-glass Thermometers 3 Terms and Definitions 3.1 digital thermometer (DCT) (referred to as Digital Thermometers) An electronic device (per ASTM E2877) consisting of a digital display and associated temperature sensing probe. 3.2 temperature sensor A temperature sensor is one part of a thermometer in which some physical change occurs with temperature and converts this change into a value on a scale, (e.g. the scale on a liquid-in-glass thermometer, a digital device that displays a unit of measure). 3.3 resistance temperature detector (RTD) A temperature measuring device that operates on the principle of a change in electrical resistance in wire as a function of temperature. 3.4 temperature transmitter A device that converts the temperature measured by the sensor(s) to electrical or electronic signal, and transmits the signal to a remote or local display. 4 Acronyms API American Petroleum Institute ASTM American Society for Testing and Materials
5.3 Equipment Precautions All temperature equipment shall be suited for the electrical classification for its location of use. They shall conform to applicable sections of the National (UL, FM, FCC, NEC, etc.) electrical safety standards or International (IMO, IEC, IACS, CENELEC, ISO, etc.) electrical safety standards. All equipment shall be maintained in a safe operating condition and manufacturers’ maintenance instructions should be complied with. All of the temperature equipment shall be capable of withstanding the design conditions for pressure, temperature, operation, and the environment. All equipment shall be designed for electromagnetic compatibility (EMC), complying with user requirements and other proper standards, which means that the equipment shall neither interfere with nor be affected by interference from other equipment. Refer to IACS Unified Requirements E10—Test Specification for Type Approval for specific tests and requirements. The equipment shall be designed with the capability to operate under variation in power source voltage according to class environmental requirements, e.g. IACS Unified Requirements E10—Test Specification for Type Approval. 6 Equipment and Design Requirements 6.1 General The following should be considered when selecting a temperature device to be used for temperature determination under dynamic conditions: a) Accuracy requirements b) Response time c) Temperature measurement range of operation d) Ambient conditions e) Resolution of the temperature device to meet the discrimination for the intended application f) Safety of operation g) Compatibility with substances being measured The selection of dynamic temperature measurement equipment and its design requirements depend on the application. Example applications include its use in prover calibration, meter proving, or calculation of the gross standard volume.