Standard Test Methods for Accumulated Deposition in a Steam Generator Tube

SIGNIFICANCE AND USE
The weight per unit area measurement is an indication of the relative cleanliness or dirtiness of the boiler. It is used to determine the effectiveness of the boiler chemical treatment program and to determine the need for chemically cleaning the boiler systems. Allowing the internal deposition to accumulate unchecked will likely lead to boiler tube failures by mechanisms of under deposit corrosion and tube metal overheating.
SCOPE
1.1 These test methods cover the determination of the weight per unit area of waterside deposits on heat-transfer surfaces of steam generator tubes. The following test methods are included:SectionsTest Method A-Mechanical removal by scraper or vibrating tool-removed deposit weight method7 to 16Test Method B-Chemical removal by solvent-tube weight loss method17 to 27Test Method C-Mechanical removal by glass-bead blasting-tube weight loss method28 to 37
1.2 Test Method A is a procedure applicable to deposits ranging from 16 to 76 g/ft2. This method allows the discretionary selection of the area on the tube to be sampled. The removed deposit allows for further chemical analysis.
1.3 Test Method B is a method applicable to deposits ranging from 28 to 73 g/ft2. The method averages out the heavier and lighter deposited areas. The solvent solution produced allows for further chemical analysis.
1.4 Test Method C is a procedure applicable to deposits ranging from 17 to 88 g/ft2. The method averages out the heavier and lighter deposited areas. The removed deposit does not allow for further chemical analysis.
1.5 These test methods have been generally evaluated on the types of waterside deposits generally found on heat-transfer surfaces of steam generator tubes. It is the users responsibility to ensure the validity of these test methods for other types of deposits or high temperature scale.
1.6 These methods are sometimes used for accumulated deposition in rifled steam generator tubes. Experience has shown that there is a significant difference in the deposition in the grooves and on the lands on some rifled steam generator tubes. The grooves have been shown to hold more deposit. Test Method B and Test Method C will average out this difference. In Method A the choice exists, either to choose to remove the deposition from the groove if it is visually determined to be more heavily deposited, or to remove equally over the grooves and lands. It is important that it be understood what choices were made and that the report reflect the choices made when using Test Method A on rifled steam generator tubes.
1.7 There are some steam generator tubes where it is apparent that half of the tube is exposed to the flame from the external appearance, this side is typically called the fireside or hot side. The other half of the tube is not exposed to the flame from the external appearance is typically called the casing side or cold side. These test methods also require that the tube be split in half, so the tube is generally split along these lines. On these tubes it is generally found that more internal deposition exists on the fireside or hot side. Some users of these methods will determine the deposition only on side where it appears visually that more deposition exists. Some users will determine the deposition on both sides and report the results separately and some will average the two results. It is important that the user of the data be aware of the choices made and that the report of the results be specific.
1.8 The values stated in either SI or inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.9 This standard does not purport to address 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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Historical
Publication Date
31-May-2005
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ASTM D3483-05 - Standard Test Methods for Accumulated Deposition in a Steam Generator Tube
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D3483–05
Standard Test Methods for
1
Accumulated Deposition in a Steam Generator Tube
This standard is issued under the fixed designation D 3483; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope were made and that the report reflect the choices made when
using Test Method A on rifled steam generator tubes.
1.1 These test methods cover the determination of the
1.7 There are some steam generator tubes where it is
weight per unit area of waterside deposits on heat-transfer
apparent that half of the tube is exposed to the flame from the
surfaces of steam generator tubes. The following test methods
external appearance, this side is typically called the fireside or
are included:
hot side. The other half of the tube is not exposed to the flame
Sections
from the external appearance is typically called the casing side
Test MethodA—Mechanical removal by scraper or vibrating 7to16
tool-removed deposit weight method
or cold side. These test methods also require that the tube be
Test Method B—Chemical removal by solvent-tube weight loss 17 to 27
split in half, so the tube is generally split along these lines. On
method
these tubes it is generally found that more internal deposition
Test Method C—Mechanical removal by glass-bead blasting- 28 to 37
tube weight loss method
exists on the fireside or hot side. Some users of these methods
will determine the deposition only on side where it appears
1.2 Test Method A is a procedure applicable to deposits
2
visually that more deposition exists. Some users will determine
ranging from 16 to 76 g/ft . This method allows the discre-
the deposition on both sides and report the results separately
tionary selection of the area on the tube to be sampled. The
and some will average the two results. It is important that the
removed deposit allows for further chemical analysis.
user of the data be aware of the choices made and that the
1.3 Test Method B is a method applicable to deposits
2
report of the results be specific.
ranging from 28 to 73 g/ft . The method averages out the
1.8 The values stated in either SI or inch-pound units are to
heavier and lighter deposited areas. The solvent solution
be regarded as the standard. The values given in parentheses
produced allows for further chemical analysis.
are for information only.
1.4 Test Method C is a procedure applicable to deposits
2
1.9 This standard does not purport to address the safety
ranging from 17 to 88 g/ft . The method averages out the
concerns, if any, associated with its use. It is the responsibility
heavier and lighter deposited areas. The removed deposit does
of the user of this standard to establish appropriate safety and
not allow for further chemical analysis.
health practices and determine the applicability of regulatory
1.5 Thesetestmethodshavebeengenerallyevaluatedonthe
limitations prior to use.
types of waterside deposits generally found on heat-transfer
surfaces of steam generator tubes. It is the user’s responsibility
2. Referenced Documents
to ensure the validity of these test methods for other types of
2
2.1 ASTM Standards:
deposits or high temperature scale.
D 887 Practices for Sampling Water-Formed Deposits
1.6 These methods are sometimes used for accumulated
D 1129 Terminology Relating to Water
deposition in rifled steam generator tubes. Experience has
D 1193 Specification for Reagent Water
shown that there is a significant difference in the deposition in
G1 Practice for Preparing, Cleaning, and Evaluating Cor-
the grooves and on the lands on some rifled steam generator
rosion Test Specimens
tubes.The grooves have been shown to hold more deposit.Test
2.2 Other Documents:
Method B and Test Method C will average out this difference.
NACE Standard TM0199-99, Item No. 21236, Standard
In Method A the choice exists, either to choose to remove the
Test Method for Measuring Deposit Mass Loading (“De-
deposition from the groove if it is visually determined to be
posit Weight Density”) Values for Boiler Tubes by the
more heavily deposited, or to remove equally over the grooves
Glass-Bead-Blasting Technique
and lands. It is important that it be understood what choices
NACE International Publication 7H100, Item No.
1
These test methods are under the jurisdiction of ASTM Committee D19 on
Water and are the direct responsibility of Subcommittee D19.03 on Sampling of
2
Water and Water-Formed Deposits, Analysis of Water for Power Generation and For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Process Use, On-Line Water Analysis, and Surveillance of Water. contact ASTM Customer Service at
...

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