ASTM D1066-06
(Practice)Standard Practice for Sampling Steam
Standard Practice for Sampling Steam
SIGNIFICANCE AND USE
It is essential to sample steam representatively in order to determine the amount of all impurities (dissolved chemicals, solid particles, chemicals absorbed on solid particles, water droplets) in it (1).3 An accurate measure of the purity of steam provides information, which may be used to determine whether the purity of the steam is within necessary limits to prevent damage or deterioration (corrosion, solid particle erosion, flow-accelerated corrosion, and deposit buildup) of downstream equipment, such as turbines. Impurities in the steam may be derived from boiler water carryover, inefficient steam separators, natural salt solubility in the steam and other factors. The most commonly specified and analyzed parameters are sodium, silica, iron, copper, and cation conductivity.
SCOPE
1.1 This practice covers the sampling of saturated and superheated steam. It is applicable to steam produced in fossil fired and nuclear boilers or by any other process means that is at a pressure sufficiently above atmospheric to establish the flow of a representative sample. It is also applicable to steam at lower and subatmospheric pressures for which means must be provided to establish representative flow.
1.2 For information on specialized sampling equipment, tests or methods of analysis, reference should be made to the Annual Book of ASTM Standards, Vols 11.01 and 11.02, relating to water.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
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An American National Standard
Designation:D1066–06
Standard Practice for
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Sampling Steam
This standard is issued under the fixed designation D1066; 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 D3370 Practices for Sampling Water from Closed Conduits
D5540 Practice for Flow Control and Temperature Control
1.1 This practice covers the sampling of saturated and
for On-Line Water Sampling and Analysis
superheated steam. It is applicable to steam produced in fossil
fired and nuclear boilers or by any other process means that is
3. Terminology
at a pressure sufficiently above atmospheric to establish the
3.1 Definitions:
flow of a representative sample. It is also applicable to steam at
3.1.1 For definitions of terms used in this practice, refer to
lower and subatmospheric pressures for which means must be
definitions given in Practice D1129.
provided to establish representative flow.
3.2 Definitions of Terms Specific to This Standard:
1.2 For information on specialized sampling equipment,
3.2.1 isokinetic sampling (representative sampling)—a con-
tests or methods of analysis, reference should be made to the
dition wherein the sample entering the port (tip) of the
Annual Book of ASTM Standards, Vols 11.01 and 11.02,
sampling nozzle has the same as the velocity vector (velocity
relating to water.
and direction) as the stream being sampled. Isokinetic sam-
1.3 The values stated in SI units are to be regarded as
pling ensures a representative sample of dissolved chemicals,
standard. The values given in parentheses are for information
solids, particles, chemicals absorbed on solid particles, and in
only.
the case of saturated and wet steam, water droplets are
1.4 This standard does not purport to address all of the
obtained.
safety concerns, if any, associated with its use. It is the
3.2.2 sample cooler—a small heat exchanger designed to
responsibility of the user of this standard to establish appro-
provide cooling/condensing of small process sampling streams
priate safety and health practices and determine the applica-
of water or steam.
bility of regulatory limitations prior to use.
3.2.3 sampling—the withdrawal of a representative portion
2. Referenced Documents of the steam flowing in the boiler drum lead or pipeline by
2
means of a sampling nozzle and the delivery of this portion of
2.1 ASTM Standards:
steam in a representative manner for analysis.
A269 Specification for Seamless and Welded Austenitic
3.2.4 saturated steam—a vapor whose temperature corre-
Stainless Steel Tubing for General Service
sponds to the boiling water temperature at the particular
A335/A335M Specification for Seamless Ferritic Alloy-
existing pressure.
Steel Pipe for High-Temperature Service
3.2.5 superheated steam—a vapor whose temperature is
D1129 Terminology Relating to Water
above the boiling water temperature at the particular existing
D1192 Guide for Equipment for SamplingWater and Steam
3 pressure.
in Closed Conduits
4. Summary of Practice
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This practice is under the jurisdiction ofASTM Committee D19 on Water, and
4.1 This practice describes the apparatus, design concepts
is the direct responsibility of Subcommittee D19.03 on Sampling Water and
and procedures to be used in extracting and transporting
Water-Formed Deposits, Analysis of Water for Power Generation and Process Use,
samples of saturated and superheated steam. Extraction nozzle
On-Line Water Analysis, and Surveillance of Water.
Current edition approved Dec. 15, 2006. Published January 2007. Originally
selection and application, line sizing, condensing requirements
approved in 1949. Last previous edition approved in 2001 as D1066 – 97 (2001).
and optimization of flow rates are all described. Condensed
DOI: 10.1520/D1066-06.
2 steam samples should be handled in accordance with Practices
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
D3370 and D5540, and Guide D1192.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3
Withdrawn. The last approved version of this historical standard is referenced
on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D1066–06
FIG. 1 Effect of Nono-Isokinetic Sampling
5. Significance and Use provide adequate turbulent flow to ensure transport of most
particulates and ionic components. More recent studies (2,3)
5.1 It is essential to sample steam represe
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