ASTM D6301-21

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Designation: D6301 − 13 D6301 − 21
Standard Practice for
Collection of On-Line Composite Samples of Suspended
Solids and Ionic Solids in Process Water
This standard is issued under the fixed designation D6301; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This practice is applicable for sampling condensed steam or water, such as boiler feedwater, for the collection of suspended
solids and (optional) ionic solids using a 0.45-μm membrane filter (suspended solids) and ion exchange media (ionic solids). As
the major suspended component found in most boiler feedwaters is some form of corrosion product from the preboiler system, the
device used for this practice is commonly called a corrosion product sampler.
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 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.
2. Referenced Documents
2.1 ASTM Standards:
D1066 Practice for Sampling Steam
D1129 Terminology Relating to Water
D1193 Specification for Reagent Water
D1971 Practices for Digestion of Water Samples for Determination of Metals by Flame Atomic Absorption, Graphite Furnace
Atomic Absorption, Plasma Emission Spectroscopy, or Plasma Mass Spectrometry
D2332 Practice for Analysis of Water-Formed Deposits by Wavelength-Dispersive X-Ray Fluorescence
D2777 Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water
D3370 Practices for Sampling Water from Flowing Process Streams
D3864 Guide for On-Line Monitoring Systems for Water Analysis
3. Terminology
3.1 Definitions—Definitions: For definitions of terms used in this practice, refer to Terminology D1129.
This practice is under the jurisdiction of ASTM Committee D19 on Water and is the direct responsibility of Subcommittee D19.03 on Sampling Water and Water-Formed
Deposits, Analysis of Water for Power Generation and Process Use, On-Line Water Analysis, and Surveillance of Water.
Current edition approved July 15, 2013Dec. 1, 2021. Published August 2013December 2021. Originally approved in 1998. Last previous edition approved in 20082013
as D6301 – 08.D6301 – 13. DOI: 10.1520/D6301-13.10.1520/D6301-21.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
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D6301 − 21
3.1.1 For definitions of terms used in this standard, refer to Terminology D1129.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 corrosion product sampler, n—a device used to collect integrated samples of suspended solids and (as an option) ionic solids.
3.2.1.1 Discussion—
It consists of a flow totalizer that accurately measures the amount of sample passing through the device and a 0.45-μm pore size
membrane filter. Adding a second filter for ion exchange resin impregnated membranes allows for collecting ionic solids.
3.2.2 ionic solids, n—includes all matter that will pass through a 0.45-μm pore size filter and may be captured on anion, or cation
ion exchange membranes, or both.
3.2.3 suspended solids, n—includes all matter that is removed by a 0.45-μm pore size filter.
4. Summary of Practice
4.1 A typical sampling apparatus, or corrosion product sampler, is used to obtain integrated, representative samples of suspended
solids and ionic solids using a 0.45-μm membrane filter and ion exchange membranes. The sampling is accomplished at system
operating pressure or after pressure reduction, and sample temperature of ≤50°C. The practice utilizes a modified stainless steel
high pressure filter housing to accommodate a 47-mm diameter filter (for suspended solids) and if desired, ion exchange
membranes (for ionic solids). The sample collection system (corrosion product sampler) is designed and operated specifically for
quantitative collection of suspended solids and ionic solids. An important feature of the sampler is the flow totalizer, which
accurately determines the total volume of sample that has passed through the sampler, regardless of changes in flowrate or pressure
during the collection period. Control and pressure reducing valves and metering devices are downstream of the filter housing to
eliminate the possible contribution of suspended solids and ionic solids from these components to the sample stream. Additional
flow may bypass the filter housing, so that flows within the sample lines are maintained within required range (see Guide D3864).
If a single sampling point is not representative due to lack of homogeneity in the process fluid (the water being sampled), multiple
point sampling may be required.
5. Significance and Use
5.1 The transport of any suspended solids or corrosion products from the preboiler cycle has been shown to be detrimental to all
types of steam generating equipment. Corrosion product transport as low as 10 ppb can have significant impact on steam generators
performance.
5.2 Deposited corrosion products on PWR pressurized water reactor (PWR) steam generator tubes can reduce heat transfer, and,
if the deposit is sufficiently thick, can provide a local area for impurities in the bulk water to concentrate, resulting in a corrosive
environment. In BWR boiling water reactor (BWR) plants, the transport of corrosion products can cause fuel failure, out of core
radiation problems from activation reactions, and other material related problems.
5.3 In fossil plants, the transport of corrosion products can reduce heat transfer in the boilers leading to tube failures from
overheating. The removal of these corrosion products by chemical cleaning is expensive and potentially harmful to the boiler tubes.
5.4 Normally, grab samples are not sensitive enough to detect changes in the level of corrosion product transport. Also, system
transients may be missed by only taking grab samples. An integrated sample over time will increase the sensitivity for detecting
the corrosion products and provide a better understanding of the total corrosion product transport to steam generators.
6. Interferences
6.1 The ion exchange capacity may be exceeded if an excessive volume of sample is passed through the ion exchange media.
6.2 The removal efficiency of the ion exchange media is flowrate and matrix dependent and could show variations from lot to lot.
6.3 Sample temperature greater than 50°C may have deleterious effects on the ion exchange media.
6.4 The corrosion products collected on the 0.45-μm filter may be loose so care should be taken to prevent loss of sample.
D6301 − 21
FIG. 1 Simplified Flow Diagram for Corrosion Product Sampler
D6301 − 21
6.5 Due to settling, or deposition, or both, in sampling lines with low velocity, flow in sampling lines must be turbulent and
maintained at a velocity of 1.8 m/s (6 ft/s) (see also Practices D3370).
7. Apparatus
7.1 Sample heat exchanger, made of such material that full system pressure can be maintained within the coil, and of such capacity
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