ASTM D6624-2019 Standard Practice for Determining a Flow-Proportioned Average Property Value (FPAPV) for a Collected Batch of Process Stream Material Using Stre.pdf
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1、Designation: D6624 19Standard Practice forDetermining a Flow-Proportioned Average Property Value(FPAPV) for a Collected Batch of Process Stream MaterialUsing Stream Analyzer Data1This standard is issued under the fixed designation D6624; the number immediately following the designation indicates the
2、 year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.INTRODUCTIONThe determination of an average property value that
3、 is representative of a batch of petroleumproduct collected and isolated in a tank or vessel has always been a challenge. Historically, theindustry practice has been to follow the appropriate procedures prescribed in Practices D4057, D5842,or D4177 to extract one sample (or a limited few, taken from
4、 top, middle, and bottom) from the tankor vessel after the content is mixed by any of several means to ensure the material is homogeneousprior to sample extraction. The extracted sample is then sent to a laboratory for analysis. Dependingon the property and its criticality, the average property valu
5、e can also be obtained by independentlyanalyzing each of the top, middle, and bottom samples and the results averaged, or, the three tanksamples are mixed and testing for the property is performed on the mixture.With the introduction of in-line blending and process stream analysis in the 1960s, the
6、potential forreal-time delivery to a pipeline, barge, ship, or tank car compartment was envisioned.To determine the average property value that is representative of a batch of product from a blendor process stream, two approaches have been developed and implemented. One depends on the use ofa compos
7、ite sampler, a vessel into which a sample of the flowing process or blended product streamis introduced at a flow-rate proportional to the flow-rate of the product stream (Practice D4177 orD7453). This sample, collected over the period of time required to generate the batch quantity ofproduct, is th
8、en analyzed using a primary test method in the laboratory. Multiple laboratory analyseson one or more aliquots of composite sample can be averaged to provide a more precise estimate ofthe property value than a single analysis.A second technique utilizes the results produced by on-line, at-line, or i
9、n-line analyticalmeasurement systems that test material from the process or in-line blended stream for the desiredproperty at regular intervals as it flows to a collection tank, pipeline, or shipping compartment. Todetermine the average property value of all the material collected (or shipped) at an
10、y time during theproduction process, a unique real time flow-proportioned averaging technique evolved. By appropriateselection of a production time period or cycle, the average property value for the collected (or shipped)material at any time in the production or shipment cycle is obtained by recurs
11、ively calculating aflow-proportion average using all available property values from the analytical measurement systemand the measured incremental quantity of product flow associated with each cycle. The determinationof this flow-proportioned average property value is the subject of this practice.Cop
12、yright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of Internat
13、ional Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.11. Scope*1.1 This practice covers a technique for calculating aflow-proportioned average property value (FPAPV) for a batchof in-line blended product or process stream mate
14、rial that iscollected over time and isolated in a storage tank or vessel,using a combination of on-line or at-line measurements takenat regular intervals of the property and flow rates.1.2 The FPAPV methodology uses regularly collected on-line or at-line process analyzer measurements, flow, andasses
15、sment of other appropriate process measurements orvalues, to calculate a flow-proportioned average property valuein accordance with flow quantity units of material produced.1.3 When the collecting vessel contains a heel (retainedmaterial prior to receipt of the production batch), both theproperty va
16、lue and quantity of the heel material can bepredetermined and factored into the calculation of the FPAPVfor the new batch.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-
17、priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDeve
18、lopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D3764 Practice for Validation of the Performance of ProcessStream Analyzer SystemsD4057 Practice for Manual Sam
19、pling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD5842 Practice for Sampling and Handling of Fuels forVolatility MeasurementD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMe
20、asurement System PerformanceD7453 Practice for Sampling of Petroleum Products forAnalysis by Process Stream Analyzers and for ProcessStream Analyzer System Validation3. Terminology3.1 Definitions:3.1.1 analysis cycle time, nperiod of time required toproperly obtain and analyze a representative sampl
21、e of theprocess stream material.3.1.2 flow-proportioned average property value (FPAPV),naverage property value of the collected material in the tankor vessel, calculated by using the flow-proportioned averagetechnique described in the practice of all measurements per-formed on aliquots of the materi
22、al while it is flowing into thetank or vessel.3.1.2.1 DiscussionThe term property as used in this prac-tice can be the physical, chemical, or performance propertymeasurements as provided by on-line or at-line analyzersystems.3.1.2.2 DiscussionThe FPAPV can include a propertyvalue contributed by mate
23、rial (commonly referred to as a tankheel) present in the collection tank or vessel before the start ofdelivery of the current process stream material. This propertyvalue can be determined using the on or at-line measurementsystem, or a different measurement system that is suitablybias-corrected to p
24、rovide statistically indistinguishable resultsfrom the on or at-line measurement system.3.1.3 fit-for-use, nproduct, system, or service that is suit-able for its intended use.3.1.4 linearly mixable, adjproperty is deemed to be lin-early mixable in a mass or volume measurement unit if theproperty of
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