BS EN 12952-12:2003 – Water-tube boilers and auxiliary installations — Part 12: Requirements for boiler feedwater and boiler water quality
1 Scope
This Part of this European Standard applies to all water-tube boilers as defined in EN 12952-1 which are heated by combustion of one or more fuels or by hot gases for the generation of steam and/or hot water.
This Part of this European Standard applies to those components between the feedwater inlet and the steam outlet of the steam generator. The quality of the steam produced is outside the scope of this standard.
This Part of this European Standard aims to ensure that the boiler is able to be operated to minimize risk to personnel,the boiler and associated plant components located near it.
NOTE 1 This part of this European Standard does not aim to achieve optimum economic operation. For certain purposes, it will be more appropriate to optimize the chemical characteristics in order to:
increase the thermal efficiency;
increase the availability and reliability of the plant;
increase steam purity;
reduce the maintenance costs – repair, chemical cleaning, etc.
This Part of this European Standard sets out minimum requirements for the specific types of water to reduce the risk of corrosion, sludge precipitation or formation of deposits which may lead to any damage or other operating problems.
NOTE 2 This Part of this European Standard has been prepared on the assumption that the user of this European Standard possesses a sufficient knowledge of the construction and operation of the boiler as well as an adequate appreciation of water and steam chemistry.
2 Normative references
This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European
Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies (including amendments).
EN 12952-1:2001, Water-tube boilers and auxiliary installations — Part 1: General.
EN ISO 9963-1, Water quality — Determination of alkalinity — Part 1: Determination of total and composite alkalinity (ISO 9963-1:1994).
ISO 5667-1, Water quality — Sampling — Part 1: Guidance on the design of sampling programmes.
ISO 5667-3, Water quality — Sampling — Part 3: Guidance on the preservation and handling of samples.
ISO 5814, Water quality — Determination of dissolved oxygen — Electrochemical probe method.
ISO 6059, Water quality — Determination of the sum of calcium and magnesium — EDTA titrimetric method.
ISO 6332, Water quality — Determination of iron — Spectrometric method using 1,10-phenanthroline.
ISO 6878, Water quality — Spectrometric determination of phosphorus using ammonium molybdate.
ISO 7888, Water quality — Determination of electrical conductivity.
ISO 8245, Water quality — Guidelines for the determination of total organic carbon (TOC) and dissolved organic carbon (DOC).
BS EN 12952-12:2003 – Water-tube boilers and auxiliary installations — Part 12: Requirements for boiler feedwater and boiler water quality