API Spec 11N:1994 pdf download

12-16-2022 comment

API Spec 11N:1994 pdf download.Specification for Lease Automatic Custody Transfer (LACT) Equipment
1 Scope
1.1 COVERAGE This specifcation describes optimum requirements fr assemblies designed fr the unattended automatic custody transfr (ACT) of liquid hydrocarbons, such as crude oil and condensate, at rates below 11,000 U.S. barrels (1750m 3 ) per 24-hour day, in field applications at less than 500 psig (3447 kPa) operating pressure. 1.2 One flow diagram illustating acceptable locations fr the charging pump, custody transfr liquid meter, monitor probe, sampling system, piping, valves and contols is pre­ sented in Fig. L 1.3 Although this specifcation depicts only one flow dia­ gram, it is recognized that other component arrangements are possible. Any design that meets the requirements of this specifcation is acceptable by agreement between user and fbricator. 1.4 Appendix A contains specifcation data sheets fr a standard API LACT Unit. Two identical data sheets are shown, one with U.S. Customary units and the other with metric units. 1.5 Required ACT system elements not described in this specifcation include the surge tank, electrical power and in­ strument gas supply, signals to start and stop the pump, con­ necting piping and valves. 1.6 Compliance with the provisions of this specifcation may result in an approach to accuracy or may establish saf­ guards not necessary under all conditions. By agreement be­ tween the user and fbricator, non mandatory portions of this specifcation may be waived. 1. 7 The compulsory verb frm shall has been used where a deviation fom the requirements may adversely afect the satisfctory operation of a system designed fr optimum op­ eration under typical producing conditions. 1.8 This specifcation presents the concurrence of the in­ dustry on current system requirements for ACT. There is equipment now in the design or feld-proving stage that may further improve the art of ACT. Such developments are en­ couraged and every efort should be made to expedit their reduction to practice and standardization.
Metering Viscous Hydrocarbons, (Redesig­ nated Chapter 6.7, API Manual of Petoleum Measurement Standards). Recommended practice fr design, installation, operation and proving of meters and meter accessories fr measurement of viscous hydrocarbons. Measurement of Petrleum Liquid Hydrcar­ bons by Positive Displacement Meter (ANSI Zl l.170-1971, ISO DIS2714-1971). Cov­ ers installation and calibration of meters and meter provers, meter-proving procedures, and meter performance. Also includes a section on operation and maintenance of metering sys­ tems, and over 100 terms and defnitions re­ lated to meter work. Lease Automatic Custody Trnsfer (ANSI Zll.249-1969), (Redesignated Chapter 6.1, API Manual of Petroleum Measurement Stan­ dards). Prepared as a general guide fr the de­ sign, installation, and operation of LACT systems for liquid hydrocarbons. The general­ ized design requirements contained in the standard indicate minimum criteria and condi­ tions required fr acceptable measurement ac­ curacy and fil-saf and security requirements.

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