ASTM D6502-10(2022) PDF
Standard Test Method for Measurement of On-line Integrated Samples of Low Level Suspended Solids and Ionic Solids in Process Water by X-Ray Fluorescence (XRF)
Standard Test Method for Measurement of On-line Integrated Samples of Low Level Suspended Solids and Ionic Solids in Process Water by X-Ray Fluorescence (XRF)
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 6
- Дата публикации:
- 1 ноября 2022 г.
- Издание:
- D6502
- ICS:
- 13.060.50
SIGNIFICANCE AND USE 5.1 Corrosion products, in the form of particulate and dissolved metals, in the steam and water circuits of electricity generating plants are of great concern to power plant operators. Aside from indicating the extent of corrosion occurring in the plant, the presence of corrosion products has deleterious effects on plant integrity and efficiency. Deposited corrosion products provide sites at which chemicals, which are innocuous at low levels, may concentrate to corrosive levels and initiate under-deposit corrosion. Also, corrosion products in feedwater enter the steam generating components where deposition on heat transfer surfaces reduces the overall efficiency of the plant. 5.2 Most plants perform some type of corrosion product monitoring. The most common method is to sample for long time periods, up to several days, after which laboratory analysis of the collected sample gives the average corrosion product level over the collection time period. This methodology is referred to as integrated sampling. With the more frequent measurements in the on-line monitor, a time profile of corrosion product transport is obtained. Transient high corrosion product levels can be detected and measured, which cannot be accomplished with integrated sampling techniques. With this newly available data, plant operators may begin to correlate periods of high corrosion product levels with controllable plant operating events. In this way, operators may make more informed operational decisions with respect to corrosion product generation and transport. SCOPE 1.1 This test method covers the operation, calibration, and data interpretation for an on-line corrosion product (metals) monitoring system. The monitoring system is based on x-ray fluorescence (XRF) analysis of metals contained on membrane filters (for suspended solids) or resin membranes (for ionic solids). Since the XRF detector is sensitive to a range of emission energy, this test method is applicable to simultaneous monitoring of the concentration levels of several metals including titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, mercury, lead, and others in a flowing sample. A detection limit below 1 ppb can be achieved for most metals. 1.2 This test method includes a description of the equipment comprising the on-line metals monitoring system, as well as, operational procedures and system specifications. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Abstract
Overview
ASTM D6502-10(2022) is a recognized standard test method developed by ASTM International for the measurement of on-line integrated samples of low-level suspended solids and ionic solids in process water using X-Ray Fluorescence (XRF). This method is essential in industries such as electricity generation, where monitoring of corrosion products-both particulate and dissolved metals-in steam and water circuits is critical for plant efficiency, safety, and regulatory compliance. The standard details procedures for on-line, real-time analysis, supporting proactive management of water quality and corrosion control.
Key Topics
- On-line Integrated Sampling: Describes the collection of water samples using membrane filters for suspended solids and resin membranes for ionic solids, accumulating metals over defined periods.
- X-Ray Fluorescence (XRF) Analysis: Utilizes XRF spectroscopy to identify and quantify a wide range of metals (including iron, nickel, copper, zinc, lead, and more) with detection limits below 1 ppb for most elements.
- System Configuration: Covers requirements for the on-line monitoring system, including x-ray probe, flow cell, filter chamber, flow totalizer, valve switching system, and data acquisition.
- Calibration and Quality Control: Outlines procedures to ensure accuracy, including preparation and use of membrane filter standards, calibration curves, and periodic calibration checks.
- Data Interpretation and Reporting: Guides users on converting raw measurements to concentration values (ppb), recording mass, sample volume, and real-time reporting.
- Precision and Sensitivity: Discusses factors affecting detection limit, including accumulation time and flow rate, as well as methods for assessing precision and reliability of results.
Applications
The ASTM D6502-10(2022) standard is primarily applied in:
- Power Generation Facilities: Monitoring and management of corrosion products in steam and water systems-crucial for protecting heat transfer surfaces and maintaining plant efficiency and longevity.
- Water Quality Assurance: On-line continuous monitoring enables rapid detection of spikes in particulate or dissolved metal concentrations, providing timely information to operators.
- Corrosion Studies: Supports detailed analysis and profiling of corrosion product transport, enabling correlation with specific operational events and process optimization strategies.
- Process Control in Industrial Water Streams: Suitable wherever low-level monitoring of metals is necessary, such as in high-purity water processing, chemical manufacturing, and nuclear plant feedwater circuits.
Using on-line XRF monitoring offers practical advantages over traditional integrated sampling, including:
- Early detection of transient events that can lead to under-deposit corrosion.
- Reduction in manual sampling and laboratory analysis turnaround times.
- Improved data-driven decision-making for plant operation and maintenance.
Related Standards
For comprehensive water analysis and process water monitoring, the following ASTM standards are commonly referenced alongside ASTM D6502-10(2022):
- ASTM D1066 - Practice for Sampling Steam
- ASTM D1129 - Terminology Relating to Water
- ASTM D2777 - Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water
- ASTM D3370 - Practices for Sampling Water from Flowing Process Streams
- ASTM D3864 - Guide for On-Line Monitoring Systems for Water Analysis
- ASTM D4453 - Practice for Handling of High Purity Water Samples
- ASTM D5540 - Practice for Flow Control and Temperature Control for On-Line Water Sampling and Analysis
- ASTM D6301 - Practice for Collection of On-Line Composite Samples of Suspended Solids and Ionic Solids in Process Water
Keywords: X-ray fluorescence, XRF, online water monitoring, corrosion products, suspended solids, ionic solids, metals analysis, process water quality, ASTM standards, power plant water systems.
By implementing ASTM D6502-10(2022), organizations benefit from improved water quality management, proactive corrosion control, and compliance with international best practices in industrial water systems.
Технические детали
- Технический комитет
- D19 - Water
- SKU
- ASTM D6502-10(2022)
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