CEN/TC 262/WG 10 - Corrosion likelihood

This European Standard gives a review of influencing factors on the corrosion likelihood of metallic components (pipes, tanks, vessels, heat exchangers, pumps etc.) in water circulation systems in buildings.
The water circulation systems considered are:
   heating systems (up to 110 °C service water temperature);
   cooling and chilling systems;
which are filled with potable water or water of similar composition according to the Directive 98/83/EC.
NOTE 1   Sanitary hot water systems with a re-circulation loop are not considered in this European Standard as they are not really closed system, because the water is continually renewed. The corrosion likelihood of these systems is discussed in EN 12502 Parts 1 to 5 [1],  [2],  [3],  [4],  [5].
NOTE 2   Cooling systems with open atmospheric towers are not considered in this European Standard because fresh water is generally added to the system periodically to compensate for losses by evaporation or blow-down.
NOTE 3   Heating systems in buildings, connected to district heating systems without an intervening heat exchanger, are not considered in this European Standard. However, local heating systems, where several buildings are heated by one boiler plant, are included.

This document reviews the influencing factors for the corrosion likelihood of bare unalloyed or low alloyed ferrous materials (mild steels and cast irons) used as tubes, tanks and equipment in water distribution and storage systems, except for water intended for human consumption.
NOTE   See EN 12502-1.

This document gives a review of influencing factors of the corrosion likelihood of copper and copper alloys used as tubes, tanks and equipment in water distribution and storage systems as defined in EN 12502-1.

This document gives a review of influencing factors of the corrosion likelihood of stainless steels used as tubes, tanks and equipment in water distribution and storage systems as defined in EN 12502-1.

This document gives a review of influencing factors of the corrosion likelihood of hot dip galvanized steel and cast iron, used as tubes, tanks and equipment, unalloyed and low alloy ferrous materials in water distribution and storage systems as defined in EN 12502-1.

This document gives guidance for the assessment of the corrosion likelihood of metallic materials in water distribution and storage systems, as a result of corrosion on the water-side.
NOTE   This document lists the different types of corrosion and describes in general terms the factors influencing corrosion likelihood.
Water distribution and storage systems considered in this document are used for waters intended for human consumption according to EC directive 98/83/EEC and for waters of similar chemical composition.
This document does not cover systems that convey the following types of water.
-   sea water;
-   brackish water;
-   geothermal water;
-   sewage water;
-   swimming pool water;
-   open cooling tower water;
-   recirculating heating and cooling water;
-   demineralized water.
Parts 2 to 5 of this document cover the factors influencing the corrosion likelihood for copper and copper alloys, hot-dip galvanized ferrous materials, stainless steels and cast iron, unalloyed and low alloyed steels in detail.
This document does not cover lead.

This part of prEN 12501 deals with the assessment of the corrosion load in soil for low-alloyed and non-alloyed ferrous materials in direct contact with soil. Corrosion protection systems and their performance are not covered by this standard but by specific products standards.
This part of the standard deals with the case of new structures to be buried and gives information for existing structures.

This standard provides a basis for assessing the corrosion likelihood in soil of buried metallic structures. These structures include for example pipelines, metal sheathed cables, storage tanks, sheet pilings, tower support anchors, culverts and earth reinforcement. Metallic materials covered by the standard are steel, cast iron and stainless steel, as well as copper, lead, aluminium, zinc and their alloys. These metallic materials may be uncoated or coated with other metallic materials.

This EN establishes a classification system for the corrosivity of atmospheric environments. It: - defines corrosivity categories of the atmospheric environments taking into account ISO 9223; - describes the determination of corrosivity based on assessment of mass loss of standard specimens after the first year of exposure; - can be used to estimate the corrosivity of an environment based on knowledge of local conditions or of specific data that characterize the local conditions, where it is not possible to make an experimental determination.