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Description of ASTM-D5462 2013ASTM D5462 - 13Standard Test Method for On-Line Measurement of Low-Level Dissolved Oxygen in WaterActive Standard ASTM D5462 | Developed by Subcommittee: D19.03 Book of Standards Volume: 11.02 ASTM D5462Significance and Use 5.1 DO may be either a corrosive or passivating agent in boiler/steam cycles and is therefore controlled to specific concentrations that are low relative to environmental and wastewater treatment samples. Out-of-specification DO concentrations may cause corrosion in boiler systems, which leads to corrosion fatigue and corrosion productsall detrimental to the life and efficient operation of a steam generator. The efficiency of DO removal from boiler feedwater by mechanical or chemical means, or both, may be monitored by continuously measuring the DO concentration before and after the removal process with on-line instrumentation. DO measurement is also a check for air leakage into the boiler water cycle. 5.2 Guidelines for feedwater to high-pressure boilers with all volatile treatment generally require a feedwater DO concentration below 5 ?g/L ( 3 ) . 5.3 Boiler feedwater with oxygenated treatment is maintained in a range of 50 to 300 ?g/L DO ( 4 ) . 5.4 In microelectronics production, DO can be detrimental in some manufacturing processes, for example, causing undesirable oxidation on silicon wafers. 1. Scope 1.1 This test method covers the on-line determination of dissolved oxygen (DO) in water samples primarily in ranges from 0 to 500 ?g/L (ppb), although higher ranges may be used for calibration. On-line instrumentation is used for continuous measurements of DO in samples that are brought through sample lines and conditioned from high-temperature and high-pressure sources when necessary. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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. For specific hazards statements, see 6.5 .
ASTM Standards D1066 Practice for Sampling Steam D1129 Terminology Relating to Water D1193 Specification for Reagent Water D2777 Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water D3370 Practices for Sampling Water from Closed Conduits D3864 Guide for Continual On-Line Monitoring Systems for Water Analysis Keywords dissolved oxygen; galvanic cell; oxygen; polarographic sensor ; ICS Code ICS Number Code 13.060.50 (Examination of water for chemical substances) DOI: 10.1520/D5462 ASTM International is a member of CrossRef. ASTM D5462The following editions for this book are also available...This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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