ASTM-D7278 2011

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D7278-11 Standard Guide for Prediction of Analyzer Sample System Lag Times

Published By	Publication Date	Number of Pages
ASTM	2011	9

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Categories: 17.220.01 - Electricity. Magnetism. General aspects, ASTM

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Description

1.1 This guide covers the application of routine calculations to estimate sample system lag time, in seconds, for gas, liquid, and mixed phase systems.

1.2 This guide considers the sources of lag time from the process sample tap, tap conditioning, sample transport, pre-analysis conditioning and analysis.

1.3 Lag times are estimated based on a prediction of flow characteristics, turbulent, nonturbulent, or laminar, and the corresponding purge requirements.

1.4 Mixed phase systems prevent reliable representative sampling so system lag times should not be used to predict sample representation of the stream.

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Terminology Summary
2	Significance and Use Basic Design Considerations Procedure
3	Keywords X1. EXAMPLE LAG TIME CALCULATIONS
4	FIG. X1.1
5	FIG. X1.2
6	FIG. X1.3
7	FIG. X1.4
8	FIG. X1.5
9	FIG. X1.6

Additional information

Standard Title	D7278-11 Standard Guide for Prediction of Analyzer Sample System Lag Times
Published Code	ASTM
Publication Date	2011
Pages Count	9
ICS Codes	17.220.01 - Electricity. Magnetism. General aspects

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ASTM-D7278 2011

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