ASTM D3483-05(2009)
(Test Method)Standard Test Methods for Accumulated Deposition in a Steam Generator Tube
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: Sections Test Method A—Mechanical removal by scraper or vibrating tool-removed deposit weight method7 to 16 Test Method B—Chemical removal by solvent-tube weight loss method17 to 27 Test 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 user’s 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.
7.1 This test method covers the ...
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Designation: D3483 − 05(Reapproved 2009)
Standard Test Methods for
Accumulated Deposition in a Steam Generator Tube
This standard is issued under the fixed designation D3483; 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 In Method A the choice exists, either to choose to remove the
deposition from the groove if it is visually determined to be
1.1 These test methods cover the determination of the
more heavily deposited, or to remove equally over the grooves
weight per unit area of waterside deposits on heat-transfer
and lands. It is important that it be understood what choices
surfaces of steam generator tubes. The following test methods
were made and that the report reflect the choices made when
are included:
using Test Method A on rifled steam generator tubes.
Sections
Test MethodA—Mechanical removal by 7 to 16
1.7 There are some steam generator tubes where it is
scraper or vibrating tool-removed deposit
apparent that half of the tube is exposed to the flame from the
weight method
external appearance, this side is typically called the fireside or
Test Method B—Chemical removal by solvent- 17 to 27
tube weight loss method
hot side. The other half of the tube is not exposed to the flame
Test Method C—Mechanical removal by glass- 28 to 37
from the external appearance is typically called the casing side
bead blasting-tube weight loss method
or cold side. These test methods also require that the tube be
1.2 Test Method A is a procedure applicable to deposits
split in half, so the tube is generally split along these lines. On
ranging from 16 to 76 g/ft . This method allows the discre-
these tubes it is generally found that more internal deposition
tionary selection of the area on the tube to be sampled. The
exists on the fireside or hot side. Some users of these methods
removed deposit allows for further chemical analysis.
will determine the deposition only on side where it appears
1.3 Test Method B is a method applicable to deposits
visually that more deposition exists. Some users will determine
ranging from 28 to 73 g/ft . The method averages out the
the deposition on both sides and report the results separately
heavier and lighter deposited areas. The solvent solution
and some will average the two results. It is important that the
produced allows for further chemical analysis.
user of the data be aware of the choices made and that the
report of the results be specific.
1.4 Test Method C is a procedure applicable to deposits
ranging from 17 to 88 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 removed deposit does
be regarded as the standard. The values given in parentheses
not allow for further chemical analysis.
are for information only.
1.5 Thesetestmethodshavebeengenerallyevaluatedonthe 1.9 This standard does not purport to address the safety
types of waterside deposits generally found on heat-transfer concerns, if any, associated with its use. It is the responsibility
surfaces of steam generator tubes. It is the user’s responsibility of the user of this standard to establish appropriate safety and
to ensure the validity of these test methods for other types of health practices and determine the applicability of regulatory
deposits or high temperature scale. limitations prior to use.
1.6 These methods are sometimes used for accumulated
2. Referenced Documents
deposition in rifled steam generator tubes. Experience has
2.1 ASTM Standards:
shown that there is a significant difference in the deposition in
D887 Practices for Sampling Water-Formed Deposits
the grooves and on the lands on some rifled steam generator
D1129 Terminology Relating to Water
tubes.The grooves have been shown to hold more deposit.Test
D1193 Specification for Reagent Water
Method B and Test Method C will average out this difference.
D2777 Practice for Determination of Precision and Bias of
Applicable Test Methods of Committee D19 on Water
G1 Practice for Preparing, Cleaning, and Evaluating Corro-
These test methods are under the jurisdiction of ASTM Committee D19 on
sion Test Specimens
Water and are 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. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved May 1, 2009. Published June 2009. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1975. Last previous edition approved in 2005 as D3483–83 (2005). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/D3483-05R09. the ASTM website.
Copyright ©ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA19428-2959. United States
D3483 − 05 (2009)
2.2 Other Documents: of sample should be 24 to 36 in., but allow an extra 12 in. on
NACE StandardTM0199-99, Item No. 21236, StandardTest each end if the sample is cut out by torch.
Method for Measuring Deposit Mass Loading (“Deposit
6.4 After the tube sample is removed, provide suitable
Weight Density”) Values for Boiler Tubes by the Glass-
identification, showing location in the boiler, orientation of
Bead-Blasting Technique
tube, and the hot and cold sides of the tube in accordance with
NACE International Publication 7H100, Item No.
Practices D887.
24206, Evaluation of Boiler Tube Deposit Mass Loading
(Deposit Weight Density) Methodology TEST METHOD A—MECHANICAL REMOVAL BY
SCRAPER OR VIBRATING TOOL
3. Terminology
7. Scope
3.1 Definitions—For definitions of terms used in this test
method, refer to Terminology D1129.
7.1 This test method covers the determination of accumu-
lated deposition in a steam generator tube by the mechanical
4. Significance and Use
removal of the deposit by scraper or vibrating tool, the
4.1 The weight per unit area measurement is an indication collection and weighing of the dry deposit. This collected
deposit is then available for further chemical analysis, if
of the relative cleanliness or dirtiness of the boiler. It is used to
determine the effectiveness of the boiler chemical treatment desired. The method also allows for discretionary removal of
the deposit from the tube in areas of the most interest.
program and to determine the need for chemically cleaning the
boiler systems.Allowing the internal deposition to accumulate
8. Summary of Test Method
unchecked will likely lead to boiler tube failures by mecha-
nisms of under deposit corrosion and tube metal overheating.
8.1 The tube is split and the area to be tested is determined
after examination; usually the area judged to be most heavily
5. Reagents and Materials
deposited. The deposits are removed mechanically by scraping
5.1 Purity of Reagents—Reagent grade chemicals shall be or vibrating from a measured area. The collected deposit is
used in all tests. Unless otherwise indicated, it is intended that weighed and the result is usually reported as grams of deposit
allregentsshallconformtothespecificationsoftheCommittee
per square foot of boiler tube surface.
on Analytical Reagents of the American Chemical Society.
9. Interferences
Other grades may be used, provided it is first ascertained that
the reagent is of sufficiently high purity to permit its use
9.1 There are no interferences, only errors in collecting the
without lessening the accuracy of the determination.
deposit, removing sufficient deposit, not removing base metal,
determination of the sample weight and the sampled area.
5.2 Purity of Water—Unless otherwise indicated, references
to water shall be understood to mean reagent water conforming
10. Apparatus
to Specification D1193, Type 4.
10.1 Cutting Tool or Torch, for removing a suitable portion
6. Sampling
of the boiler tube.
6.1 Select a tube section likely to have the heaviest deposit.
10.2 Tube Cutter.
Experience has shown that deposit accumulation is usually
10.3 Tube End Sealers, to protect the sample until the
heaviest on tube surfaces that receive the highest heat transfer.
determination can be made.
Representative areas of especially high heat transfer are:
10.4 Milling Machine or Band Saw, to separate the tube into
6.1.1 The center of the division wall at the top burner
halves by longitudinal sectioning (dry cut).
elevation in a boiler with a division panel wall where firing
occurs on opposite sides.
10.5 Magnet, to remove cutting metal chips from the
6.1.2 Thesidewallnearthetopburnerelevation,atabout ⁄3
deposited material.
furnace depth from the burner wall, in a boiler without a
10.6 Scraping Tool, for removal of less adherent deposits.
division wall.
Scraper material of construction needs to be of sufficient
6.1.3 Other high heat transfer areas in a more complex
hardness as not to contaminate the deposit sample.
boiler design as indicated by the boiler manufacturer.
10.7 Vise, sometimes is used to crimp tube to remove brittle
6.2 Areas in the boiler where impaired circulation is sus-
deposits.
pected may also be sampled.
10.8 Vibrating Tool, to remove more adherent deposits. A
6.3 The optimal tube removal method is by dry cutting. No
small head should be available for use within pits.
oil or water is to be used in the tube cutting process.The length
10.9 Oven, for drying deposits.
10.10 Analytical Balance, for weighing deposits.
Reagent Chemicals, American Chemical Society Specifications , American
Chemical Society, Washington, DC. For suggestions on the testing of reagents not
listed by the American Chemical Society, see Analar Standards for Laboratory 11. Procedure
Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
11.1 Split the tube sample taken in Section 6 in halves
and National Formulary, U.S. Pharmaceutical Convention, Inc. (USPC), Rockville,
MD. longitudinally, separating the hot side from the cold side if the
D3483 − 05 (2009)
distinction is apparent from the external surface or from 12. Calculation
labeling. Be careful to disturb the internal deposit as little as
12.1 Determine the weight of accumulated deposits per unit
possible. Carefully remove all cutting fragments from the
area, by dividing the removed deposit weight by the measured
deposit with the magnet.
area.
11.2 Examine and photograph the internal surfaces, if de-
13. Report
sired. Determine the area to be tested and mark off the
13.1 The results are usually reported as g/ft .
boundaries. This will usually be the area of heaviest deposit
and will be on the hot side section of the tube. A similar area
14. Precision and Bias
can be marked off and tested on the cold side section for
14.1 Practice D2777 is not applicable to this Standard Test
comparison, if desired.
Method because a known and repeatable standard reference
deposit contained within a steam generator tube cannot be
11.3 Carefully, scrape the surface to dislodge and individu-
produced.
ally collect the more easily removable deposits from the
selected area. Complete the deposit removal by brushing or
14.2 Factors that produce errors in mass loss measurement
applying an electric vibrating tool, or both. Dry the removed
include improper balance calibration, loss of removed deposi-
material in an oven at 105°C for 1 hour if it appears to be
tion prior to weighing, incomplete deposition removal, and
hydrated. It is optional to grind the removed deposit suffi-
removal of base metal. Generally, modern analytical balances
ciently to pass through a No. 325 (45-µm) stainless steel sieve
if calibrated and used correctly are not considered to be a
and weigh the screened portion. Record the weight in milli-
significant source of error. The other factors are considered
grams.
more significant.
14.3 The determination of the sample area is likely the least
11.4 Determine the area from which the deposit was re-
precise step with this method, particularly for riffled tubes.
moved, measuring each dimension to the nearest 1 mm. If the
areahasaregularshape,directmeasurementcanbeused.Ifthe
14.4 This method was tested by five laboratories. These
area has an irregular shape, one technique used to determine
collaborative test data were obtained on sections of boiler tube
the area is to trim paper to the pattern of the actual surface that
samples from two specific boilers. For other boiler tube
had deposit removed. Then determine the area by comparing samples, these data may not apply.
the weight of the irregular paper pattern to the weight of a
14.4.1 Precision—An example of the precision obtained on
paper of known area. these specific boiler tubes is shown in Fig. 1
. 16. Keywords
14.4.2 Bias—Bias data could not be determined because of
16.1 boiler; deposit; deposition; rifled; steam generator tube
the lack of a boiler tube containing a known and consistent
deposit. TEST METHOD B—CHEMICAL REMOVAL BY
SOLVENT
14.5 Data for this estimated procedure variance is from
NACE International Publication 7H100, Item No. 24206,
17. Scope
“Evaluation of Boiler Tube Deposit Mass Loading (Deposit
Weight Density) Methodology.”
17.1 This test method covers the determination of accumu-
lated deposition in a steam generator tube by chemical removal
15. Quality Control (QC)
of the deposit and measuring the weight change in the deposit.
This solvent containing the deposit is then available for further
15.1 In order to be certain that analytical values obtained
using this test method are valid and accurate within the chemical analysis, if desired. The method does not allow for
confidencelimitsofthetest,thefollowingQCproceduresmust discretionary removal of the deposit from the tube in areas of
be followed when running the test:
the most interest.
15.2 A method has been shown to determine the optimum
18. Summary of Test Method
length of time or other variable factors concerning the cleaning
procedure, which indicates the optimum point where deposi-
18.1 The deposit that has accumulated in the selected boiler
tionhasbeenremovedbutbasemetalhasnotbeenremoved,as
tube specimen is determined by measuring the weight loss of
showninASTMStandardG1StandardPracticesforPreparing,
the tube sample after deposit removal with inhibited hydro-
Cleaning, and Evaluating Corrosion Test Specimens.
chloric acid. In the event copper plates out on the tube sample
during the cleaning operation, an ammonium persulfate solu-
15.3 Calibration and Calibration Verification:
tion is used to remove the copper pr
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
An American National Standard Designation: D 3483 – 05 (Reapproved 2009)
Designation:D 3483–83 (Reapproved 1999)
Standard Test Methods for
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 (´) indicates an editorial change since the last revision or reapproval.
1. 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. Two The following test methods are given as follows: included:
Sections Test Method A—Mechanical Removal 6to11
Test Method B—Solvent Removal 12 to 18
Test Method A—Mechanical removal by scraper or vibrating 7to16
tool-removed deposit weight method
Test Method B—Chemical removal by solvent-tube weight loss 17 to 27
method
Test Method C—Mechanical removal by glass-bead blasting- 28 to 37
tube weight loss method
1.2Neither test method is normally applicable to fire-tube boilers.
1.3A comparison of the results obtainable with the two test methods is shown in Fig. 1.
1.4Ascope section is provided in each test method. It is the responsibility of the analyst to determine the acceptability of these
test methods for each situation.
1.5
1.2 Test Method A is a procedure applicable to deposits ranging from 16 to 76 g/ft . 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/ft . 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/ft . 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 user’s 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 andTest Method C will average out this difference. In MethodAthe 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
These test methods are under the jurisdiction ofASTM Committee D-19 D19 on Water and are the direct responsibility of Subcommittee D19.03 on Sampling of Water
and Water-Formed Deposits, Surveillance of Water, and Flow Measurement of Water.
Current edition approved April 29, 1983. Published August 1983. Originally published as D3483–75T. Last previous edition D3483–78.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 May 1, 2009. Published June 2009. Originally approved in 1975. Last previous edition approved in 2005 as D 3483–83 (2005).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 3483 – 05 (2009)
user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations
prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D 887 Practices for Sampling Water-Formed Deposits
D 1129 Terminology Relating to Water
D 1193 Specification for Reagent Water Specification for Reagent Water
D 2777 Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water
G1 Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens
2.2 Other Documents:
NACE Standard TM0199-99, Item No. 21236, Standard Test Method for Measuring Deposit Mass Loading (“Deposit Weight
Density”) Values for Boiler Tubes by the Glass-Bead-Blasting Technique
Annual Book of ASTM Standards, Vol 11.02.
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
D 3483 – 05 (2009)
NACE International Publication 7H100, Item No. 24206, Evaluation of Boiler Tube Deposit Mass Loading (Deposit Weight
Density) Methodology
3. Terminology
3.1 Definitions: —ForFor definitions of terms used in thesethis test methods,method, refer to Terminology D 1129.
4. Significance and Use
4.1The weight per unit area measurement is an indication of the relative cleanliness or dirtiness of the boiler; therefore, it is
important that a tube sample be selected that represents near maximum deposition.
4.1 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.
5. Reagents and Materials
5.1 Purity of Reagents—Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all
regents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society. Other
grades may be used, provided it is first ascertained that the reagent is of sufficiently high purity to permit its use without lessening
the accuracy of the determination.
5.2 Purity of Water—Unless otherwise indicated, references to water shall be understood to mean reagent water conforming to
Specification D 1193, Type 4.
6. Sampling
56.1 Select a tube section likely to have the heaviest deposit. Experience has shown that deposit accumulation is usually
heaviest on tube surfaces that receive the highest heat transfer. Representative areas of especially high absorption heat transfer are:
5.1.1The6.1.1 The center of the division wall at the top burner elevation in a boiler with a division panel wall where firing
occurs on opposite sides.
5.1.2The6.1.2 The side wall near the top burner elevation, at about ⁄3 furnace depth from the burner wall, in a boiler without
a division wall.
5.1.3Other high heat absorption areas in a more complex boiler design as delineated by the boiler manufacture.
5.2Areas in the boiler where impaired circulation is suspected may also be sampled.
5.3After selecting the boiler tube to be sampled, provide suitable identification, showing location in the boiler, the direction of
flow, and the hot and shielded sides in accordance with Practices D887
6.1.3 Other high heat transfer areas in a more complex boiler design as indicated by the boiler manufacturer.
6.2 Areas in the boiler where impaired circulation is suspected may also be sampled.
6.3 The optimal tube removal method is by dry cutting. No oil or water is to be used in the tube cutting process. The length
of sample should be 24 to 36 in., but allow an extra 12 in. on each end if the sample is cut out by torch.
6.4 After the tube sample is removed, provide suitable identification, showing location in the boiler, orientation of tube, and the
hot and cold sides of the tube in accordance with Practices D 887.
5.3.1Removeasufficientportionofthetubetocontainaselected600-mm(24-in)section,allowingatleast300mm(12in.)more
on each side of the sample if a cutting torch is used.
NOTE1—No oil or water is to be used in any mechanical cutting operation.
5.3.2Separate a selected 600-mm (24-in.) section by careful application of an anchored pipe vise and a tube cutter.
TEST METHOD A—MECHANICAL REMOVAL
6.Scope
6.1The mechanical removal test method is preferred when deposition is comparatively heavy and the deposits are relatively easy
to dislodge. The deposit, so removed, may serve as the sample for determining the composition of the material.
TEST METHOD A—MECHANICAL REMOVAL BY SCRAPER OR VIBRATING TOOL
7. Summary of Test Method
7.1A section of the most heavily fouled portion of the sampled tube is selected on a visual basis. After dividing the tube, the
water-formed deposit is removed mechanically from a measured area. The weight of the dry material is reported as milligrams of
Annual Book of ASTM Standards, Vol 11.01.Reagent Chemicals, American Chemical Society Specifications , American Chemical Society, Washington, DC. For
suggestions on the testing of reagents not listed by the American Chemical Society, see Analar Standards for Laboratory Chemicals, BDH Ltd., Poole, Dorset, U.K., and
the United States Pharmacopeia and National Formulary, U.S. Pharmaceutical Convention, Inc. (USPC), Rockville, MD.
D 3483 – 05 (2009)
deposit per square millimetre of boiler tube surface. Scope
7.1 This test method covers the determination of accumulated deposition in a steam generator tube by the mechanical removal
of the deposit by scraper or vibrating tool, the collection and weighing of the dry deposit. This collected deposit is then available
for further chemical analysis, if desired. The method also allows for discretionary removal of the deposit from the tube in areas
of the most interest.
8. Summary of Test Method
8.1 The tube is split and the area to be tested is determined after examination; usually the area judged to be most heavily
deposited.Thedepositsareremovedmechanicallybyscrapingorvibratingfromameasuredarea.Thecollecteddepositisweighed
and the result is usually reported as grams of deposit per square foot of boiler tube surface.
9. Interferences
9.1 There are no interferences, only errors in collecting the deposit, removing sufficient deposit, not removing base metal,
determination of the sample weight and the sampled area.
10. Apparatus
8.1
10.1 Cutting Tool or Torch, removing a suitable portion of boiler tube and a vise for crimping.
NOTE2—Lightly crimping the sample tube in a vise may be effective in removal of very brittle deposits. However, any physical change that the tube
specimen is subjected to may effect any subsequent metallographic examination.
8.2, for removing a suitable portion of the boiler tube.
10.2 Tube Cutter.
8.3
10.3 Tube End Sealers, to protect the sample if the determination is to be made elsewhere than on the site.
8.4Milling Machine (Preferred) or Band Saw, to separate the fireside half of the tube from the shielded half by longitudinal
sectioning (dry cut).
8.5, to protect the sample until the determination can be made.
10.4 Milling Machine or Band Saw , to separate the tube into halves by longitudinal sectioning (dry cut).
10.5 Magnet, to remove metal chips from the deposited material, especially if a band saw is used.
8.6, to remove cutting metal chips from the deposited material.
10.6 Scraping Tool, for removing the less adherent deposits (like a scalpel or a heavy screwdriver, the end of which has been
thinned).
8.7, for removal of less adherent deposits. Scraper material of construction needs to be of suffıcient hardness as not to
contaminate the deposit sample.
10.7 Vise, for removal of brittle deposits.
8.8, sometimes is used to crimp tube to remove brittle deposits.
10.8 Vibrating Tool, to remove more adherent deposits (adeposits. A small head should be available for use within pits).pits.
8.910.9 Oven, for drying the deposits.
8.10, for drying deposits.
10.10 Analytical Balance.
9., for weighing deposits.
11. Procedure
9.1Take the 600-mm (24-in.) tube section obtained in 5.3.2.
9.2Separate (dry cut) the fireside half of the tube longitudinally from the shielded (or casing) half, being careful to affect the
deposit as little as possible. If a band saw is used, carefully remove all fragments of metal with a magnet. Observe closely to be
sure that only metal fragments are removed.
9.3Examine the water-formed deposit (photograph if desired), and select and mark-off the boundaries of the 150-mm (6-in.)
specimen of tubing on the internal fireside that appears to be most heavily fouled and relatively uniform (undiminished by
spalling). Mark a similar area on the internal casing half of the tube for comparison.
9.4Carefully scrape the surface to dislodge and individually collect the more easily removable deposits from between the
boundaries of each sample. Complete the deposit removal by brushing or applying an electric vibrating tool, or both. Dry the
removed material in an oven at 105°C f
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