ASTM-D1066 Standard Practice for Sampling Steam

ASTM-D1066 - 2018(E1) EDITION - CURRENT
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Standard Practice for Sampling Steam
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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 standard. The values given in parentheses are mathematical conversions to inch-pound 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

Significance and Use

5.1 It is essential to extract and transport steam in a manner that provides the most representative sample of the process steam in order to accurately 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 that 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 and process heat exchangers. The sources of impurities in the steam can include 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.

Keywords

isokinetic sampling; sample cooler; sampling; sampling nozzles; saturated steam; superheated steam;; ICS Number Code 13.060.30 (Sewage water)

To find similar documents by ASTM Volume:

11.01 (Water (I))

To find similar documents by classification:

13.060.30 (Sewage water Including sewage water disposal and treatment Liquid wastes, see 13.030.20 Drainage systems, see 91.140.80 Sewage systems, see 93.030)

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Document Number

ASTM-D1066-18e1

Revision Level

2018(E1) EDITION

Status

Current

Modification Type

Editorially changed

Publication Date

Dec. 1, 2018

Document Type

Practice

Page Count

6 pages

Committee Number

D19.03