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ASTM D807-14

Standard Practice for Assessing the Tendency of Industrial Boiler Waters to Cause Embrittlement (USBM Embrittlement Detector Method)

Automaticky přeložený název:

Standardní praxe pro posouzení tendenci průmyslových kotlů Waters způsobit křehnutí (USBM Zkřehnutí detektor Method)

NORMA vydána dne 1.1.2014

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Informace o normě:

Označení normy: ASTM D807-14
Poznámka: NEPLATNÁ
Datum vydání normy: 1.1.2014
Kód zboží: NS-39352
Počet stran: 6
Přibližná hmotnost: 18 g (0.04 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM

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Kategorie - podobné normy:

Bojlery a výměníky tepla

Anotace textu normy ASTM D807-14 :

Keywords:
boiler water, cracking, detector, embrittlement, intercrystalline, ICS Number Code 27.060.30 (Boilers and heat exchangers)

Doplňující informace

Significance and Use

5.1 Embrittlement is a form of intercrystalline cracking that is associated with the exposure of boiler steel to a combination of physical and chemical factors. For embrittlement of boiler metal to occur, the metal must be under stress, it must be at the site of a leak, and it must be exposed to the concentrated boiler water. In addition, the boiler water must be embrittling in nature. The precise chemical causes of the embrittling nature of some waters are not well understood. Experience has shown that certain waters exhibit an embrittling characteristic while others do not.

5.2 Because embrittlement is a form of cracking, it is nearly impossible to detect in an operating boiler until a failure has occurred. In general, cracking failures tend to be sudden, and often with serious consequences. This practice offers a way to determine whether a particular water is embrittling or not. It also makes it possible to determine if specific treatment actions have rendered the water nonembrittling.

1. Scope

1.1 This practice,³ known as the embrittlement-detector method, covers the apparatus and procedure for determining the embrittling or nonembrittling characteristics of the water in an operating boiler. The interpretation of the results shall be restricted to the limits set forth in 8.6.

1.2 The effectiveness of treatment to prevent cracking, as well as an indication of whether an unsafe condition exists, are shown by this practice. Such treatments are evaluated in terms of method specimen resistance to failure.

1.3 The practice may be applied to embrittlement resistance testing of steels other than boiler plate, provided that a duplicate, unexposed specimen does not crack when bent 90° on a 2-in. (51-mm) radius.

1.4 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.

1.5 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.

2. Referenced Documents

A108-24	Standard Specification for Steel Bar, Carbon and Alloy, Cold-Finished
E1351-01(2020)	Standard Practice for Production and Evaluation of Field Metallographic Replicas
E883-11(2017)	Standard Guide for Reflected-Light Photomicrography
E3-11(2017)	Standard Guide for Preparation of Metallographic Specimens
D1193-06(2018)	Standard Specification for Reagent Water
D1129-13(2020)e2	Standard Terminology Relating to Water (Includes all amendments and changes 2/14/2024).
A515/A515M-17(2022)	Standard Specification for Pressure Vessel Plates, Carbon Steel, for Intermediate- and Higher-Temperature Service