ASTM D5256-00
(Test Method)Standard Test Method for Relative Efficacy of Dynamic Solvent Systems for Dissolving Water-Formed Deposits
Standard Test Method for Relative Efficacy of Dynamic Solvent Systems for Dissolving Water-Formed Deposits
SCOPE
1.1 This test method covers the determination of the relative efficacy of dynamic solvent systems for dissolving water-formed deposits that have been either removed from the underlying material or synthetically prepared, or deposits attached to the underlying material.
1.2 The nature of this test method is such that statements of precision and bias as determined by round robin tests could mislead users of this test method (see Sections 11 and 12). Therefore, no precision and bias statements are made.
1.3 The values stated in SI units are to be regarded as the standard.
1.4 This standard does not purport to address all of the safety problems, 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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An American National Standard
Designation:D5256–00
Standard Test Method for
Relative Efficacy of Dynamic Solvent Systems for
Dissolving Water-Formed Deposits
This standard is issued under the fixed designation D 5256; 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 D 4743 Test Methods for Efficacy of Solvent Systems for
Dissolving Water-Formed Deposits
1.1 This test method covers the determination of the relative
efficacy of dynamic solvent systems for dissolving water-
3. Terminology
formed deposits that have been removed from the underlying
3.1 Definitions:
material or deposits attached to the underlying material.
3.1.1 water-formed deposits—any accumulation of in-
1.2 The nature of this test method is such that statements of
soluble material derived from water or formed by the reaction
precision and bias as determined by round robin tests could
ofwateruponthesurfaceincontactwiththewater.See3.1.1.1.
mislead users of this test method (see Sections 11 and 12).
3.1.1.1 Discussion—Deposits formed from or by water in
Therefore, no precision and bias statements are made.
all its phases may be further classified as scale, sludge,
1.3 The values stated in SI units are to be regarded as the
corrosion products, or biological deposits. The overall compo-
standard.
sition of a deposit or some part of a deposit may be determined
1.4 This standard does not purport to address all of the
by chemical or spectrographic analysis; the constituents actu-
safety concerns, if any, associated with its use. It is the
ally present as chemical substances may be identified by
responsibility of the user of this standard to establish appro-
microscope or x-ray diffraction studies. Organisms may be
priate safety and health practices and determine the applica-
identified by microscopical or biological methods.
bility of regulatory limitations prior to use.
3.1.2 For definitions of other terms used in this test method,
2. Referenced Documents refer to Terminology D 1129 and Test Method D 4743.
3.2 Definitions of Terms Specific to This Standard:
2.1 ASTM Standards:
3.2.1 dynamic solvent system—any closed loop system in
D 887 Practice for Sampling Water-Formed Deposits
which the solvent is in motion across the deposit surface.
D 1129 Terminology Relating to Water
3 3.2.2 single and multiple solvent systems—a single solvent
D 1193 Specification for Reagent Water
systemisaone-solutiontreatment.Amultiplesolventsystemis
D 2331 Practices for Preparation and PreliminaryTesting of
2 a treatment using two or more solutions in sequence.
Water-Formed Deposits
3.2.3 solvent system—specified chemicals or combination
D 2777 Practice for Determination of Precision and Bias of
3 of chemicals, that may include corrosion inhibitors, formulated
Applicable Methods of Committee D-19 on Water
to react with and remove deposits.
D 2790 Methods for Analysis of Solvent Systems Used for
Removal of Water-Formed Deposits
4. Summary of Test Method
D 3263 Test Methods for Corrosivity of Solvent Systems
2 4.1 This test method consists of determining the ability of a
for Removing Water-Formed Deposits
dynamic solvent system to dissolve deposits.
D 3483 Test Methods for Accumulated Deposition in a
4.2 For the unattached deposits, this test method consists of
Steam Generator Tube
exposing weighed amounts of deposit to the dynamic solvent
systems and determining the weight loss of the exposed
This test method is under the jurisdiction ofASTM Committee D-19 on Water deposit, thereby determining the efficacy of the solvent system.
and is the direct responsibility of Subcommittee D19.03 on Sampling of Water and
4.3 For the attached deposits, the amount and time required
Water-Formed Deposits, Surveillance of Water, and Flow Measurement of Water.
to yield a constant amount of certain loss of interest and the
Current edition approved June 10, 2000. Published July 2000. Originally
amount of deposit not removed determines the relative efficacy
published as D 5256–92. Last previous edition D 5256–92 (1996)
Annual Book of ASTM Standards, Vol 11.02.
of the dynamic solvent system.
Annual Book of ASTM Standards, Vol 11.01.
Discontinued; see 1993 Annual Book of ASTM Standards, Vol 11.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D5256–00
5. Significance and Use
5.1 This test method is useful because the choice of a
solvent system for removing water-formed deposits depends
upon the ability of the dynamic solvent system to dissolve both
unattached and attached deposits.
6. Apparatus
6.1 Common Equipment:
NOTE 1—The equipment listed in this section is basic and serves the
function of this test method. This basic test procedure could be modified
to meet the specific needs of a particular investigation. The test apparatus,
however, must be identified and reported with the results. For comparative
type tests, as described in the procedure, it is important that all tests be run
in an identical manner.
6.2 Unattached or Synthetic Deposit Removal (See Fig. 1
and Fig. 2):
6.2.1 Balance, capable of weighing to the nearest 0.1 mg.
6.2.2 Heating Bath, thermostatically controlled to 6 1°C.
6.2.3 Stirrer, controlled agitation.
A: Stirrer, B: Pressure Control (Gauge, Vent and Relief), C: Temperature Mea-
6.2.4 Temperature Indicator.
surement, D: Temperature Control, E: Heated Autoclave
6.2.5 Reaction Flask, stirred tests are best accomplished in
FIG. 2 High Temperature Test Equipment
round bottom flasks.
6.2.6 Condenser.
6.3 Attached Deposit Removal (See Fig. 3):
6.3.1 Solvent Heater/Solvent Reservoir.
6.3.2 Sample Holder.
6.3.3 Flow Controller.
6.3.4 Sample System (usually with cooler).
6.3.5 Pressure Relief.
6.3.6 Pump.
A: High Point Pressure Relief, B: Pressure Gauge, C: Vent, D: Solvent Addition
Valve, E: Temperature Measurement, F: Flow Measurement, G: Tube Sample
Holder, H: Variable Speed Pump, I: Sample Valve With Integral Cooler, J: Regu-
lated Heat Source
FIG. 3 Dynamic Test Equipment
6.3.7 Flow Meter.
6.3.8 Temperature Controller.
7. Reagents
7.1 Purity of Reagents—All solvent materials such as acids,
A: Condenser, B: Temperature Measurement, C: Stirrer, D: Heated Reaction
Flask
inhibitors, and other additives shall be of the grade normally
FIG. 1 Low Temperature Test Equipment employed in chemical cleaning practices for the removal of
D5256–00
water-formed deposits. Unless otherwise indicated, it is in- 9.3.1 Establish accumulated deposition in accordance with
tended that all chemicals shall conform to the specifications of Test Methods D 3483 on a portion of the sample adjacent to
theCommitteeonAnalyticalReagentsoftheAmericanChemi- and representative of the section to be tested below.
cal Society, where such specifications are available. 9.3.2 The ratio of the weight of attached deposit on the test
7.2 Purity of Water— Unless otherwise indicated references specimen to test apparatus volume must be recorded and
to water shall be understood to mean reagent water conforming should be appropriate for the application (see Note 5).
to Type II of Specification D 1193.
NOTE 5—Due to the constraints imposed by the solvent circulation
system, the solvent volume/deposit weight ratio on attached deposits is
8. Sampling
often larger than desired. This excess capacity can be partially compen-
8.1 Collect and preserve the sample in accordance with
sated by reducing the concentration of the active components of the
solvent. However, in all cases the actual cleaning operation should be
Practices D 887 (see Note 2).
designed and controlled according to the accepted
...
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