Significance and Use
5.1 The goal of sampling is to obtain for analysis a portion of the whole that is representative. The most critical factors are the selection of sampling areas and number of samples, the method used for sampling, and the maintenance of the integrity of the sample prior to analysis. Analysis of water-formed deposits should give valuable information concerning cycle system chemistry, component corrosion, erosion, the failure mechanism, the need for chemical cleaning, the method of chemical cleaning, localized cycle corrosion, boiler carryover, flow patterns in a turbine, and the rate of radiation build-up. Some sources of water-formed deposits are cycle corrosion products, make-up water contaminants, and condenser cooling water contaminants.
1.1 These practices cover the sampling of water-formed deposits for chemical, physical, biological, or radiological analysis. The practices cover both field and laboratory sampling. It also defines the various types of deposits. The following practices are included:
Practice A—Sampling Water-Formed Deposits From Tubing
of Steam Generators and Heat Exchangers
8 to 10
Practice B—Sampling Water-Formed Deposits From Steam
11 to 14
1.2 The general procedures of selection and removal of deposits given here can be applied to a variety of surfaces that are subject to water-formed deposits. However, the investigator must resort to his individual experience and judgment in applying these procedures to his specific problem.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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. See Section 7, 9.8, 22.214.171.124, and 9.14 for specific hazards statements.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D512 Test Methods for Chloride Ion In Water
D934 Practices for Identification of Crystalline Compounds in Water-Formed Deposits By X-Ray Diffraction
D1129 Terminology Relating to Water
D1193 Specification for Reagent Water
D1245 Practice for Examination of Water-Formed Deposits by Chemical Microscopy
D1293 Test Methods for pH of Water
D2331 Practices for Preparation and Preliminary Testing of Water-Formed Deposits
D2332 Practice for Analysis of Water-Formed Deposits by Wavelength-Dispersive X-Ray Fluorescence
D3483 Test Methods for Accumulated Deposition in a Steam Generator Tube
D4412 Test Methods for Sulfate-Reducing Bacteria in Water and Water-Formed Deposits
ICS Number Code 13.060.30 (Sewage water)
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Citing ASTM Standards
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