API MPMS 14.3.2 2016 pdf free download

API MPMS 14.3.2 2016 pdf free download.Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids— Concentric, Square-edged Orifice Meters Part 2: Specification and Installation Requirements.
1.2 Construction and Installation Requirements This document outlines the various design parameters that shall be considered when designing metering facilities using orifice meters. The mechanical tolerances found in this document encompass a wide range of orifice diameter ratios for which experimental results are available. For all existing installations, the decision to upgrade to meet the requirements of this standard shall be at the discretion of the parties involved. The parties should be cognizant that if a meter installation is not upgraded to meet this standard, measurement bias errors may exist due to inadequate flow conditioning and upstream straight pipe lengths. Use of the calculation procedures and techniques shown in the API MPMS Ch.14.3.1/AGA Report No. 3, Part 1 and API MPMS Ch.14.3.3/AGA Report No. 3, Part 3, with existing equipment is recommended, since these represent significant improvements over the previous methods. The uncertainty levels for flow measurement using existing equipment may be different from those quoted in API MPMS Chapter 14.3.1/AGA Report No. 3, Part 1. Use of orifice meters at the extremes of their diameter ratio (β r ) ranges should be avoided whenever possible. Good metering design and practice tend to be somewhat conservative. This means that the use of the tightest tolerances in the mid-diameter ratio (β r ) ranges would have the highest probability of producing the best measurement. An indication of this is found in the section on uncertainty in API MPMS Chapter 14.3.1/AGA Report No. 3, Part 1. This standard is based on β r between 0.10 and 0.75. Minimum uncertainty of the orifice plate coefficient of discharge (C d ) is achieved with β r between 0.2 and 0.6 and orifice bore diameters greater than or equal to 0.45 inch. Diameter ratios and orifice bore diameters outside of this range may be used; the user should consult the uncertainty section in API MPMS Chapter 14.3.1/AGA Report No. 3, Part 1 for limitations.
3.1.10 meter tube The straight sections of pipe, including all segments that are integral to the orifice plate holder, upstream and downstream of the orifice plate, as specified in 5.1. 3.1.11 meter tube internal diameter (D) The inside diameter of the upstream section of the meter tube computed at flowing temperature (T f ), as specified in 1.6.3 of API MPMS Ch.14.3.1/AGA Report No. 3, Part 1. The calculated meter tube internal diameter (D) is used in the diameter ratio and Reynolds number equations. 3.1.12 published meter tube internal diameter (D i ) The inside diameter as published in standard handbooks for engineers. This internal diameter is used for determining the required meter run length in Table 7, Table 8a, and Table 8b. 3.1.13 measured meter tube internal diameter (D m ) The average inside diameter of the upstream section of the meter tube measured 1 in. upstream of the adjacent face of the orifice plate and at the temperature of the meter tube (T m ) at the time of internal diameter measurements, as specified in 5.1.2. 3.1.14 reference meter tube internal diameter (D r ) The inside diameter of the upstream section of the meter tube calculated at the reference temperature (T r ), as specified in 5.1.2. The reference meter tube internal diameter is the certified meter tube internal diameter. 3.1.15 orifice plate A thin square-edged plate with a machined circular bore, concentric with the meter tube ID, when installed. 3.1.16 orifice plate bore diameter (d) The internal diameter of the orifice plate measuring aperture (bore) computed at flowing temperature (T f ), as specified in 1.6.2 in API MPMS Ch.14.3.1/AGA Report No. 3, Part 1. The calculated orifice plate bore diameter (d) is used in the flow equation for the determination of flow rate.