BS EN ISO 12944-1:2017 download free.Paints and varnishes – Corrosion protection of
steel structures by protective paint systems.
1 Scope
BS EN ISO 12944-1 defines the overall scope of ISO 12944 (all parts). It gives some basic terms and definitions and a general introduction to the other parts of ISO 12944. Furthermore, it indudes a general statement on health, safety and environmental protection, and guidelines for using ISO 12944 (all parts) fora given project.
2 Normative references
The following documents are referred to in the text in such a way that some or all or their content constitutes requirements of BS EN ISO 12944-1. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies,
ISO 4628-1, Paints and varnishes — Evaluation of degradation of coat Irigs — Designation of quantity and size of defects and of intensity of uniform changes in appearance — Part 1: General introduction and designation system
ISO 4628-2, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size of defects, and of intensity of uniform changes in appearance — Part 2: Assessment pf degree of blistering
ISO 4628-3, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size of dcl ects, and of intensity of uniform changes In appearance — Part 3: Assessment of degree of rusting
ISO 46284, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size of defects, and of intensity of uniform changes in appearance — Part 4: Assessment of degree of cracking
ISO 4628-5, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size of defects, and of intensity of uniform changes in appearance — PartS: Assessment of degree of flaking
ISO 12944-2, Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 2: ClassificatIon of environ menu
ISO 12944-3, Paints and varnishes — Corrosion protection of st eel structures by protective paint systems — Part 3: Design considerations
ISO 12944-4. Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 4: 7)’pes of surface and surface preparation
ISO 12944-5, Paints and varnishes — Corrosion protection of steel structures by protect we paint systems — PartS: Protective paint systems
ISO 12944-6. Paints and varnishes — Corrosion protection of steel struct ui-es by prot ective paint systems — Part 6: Laboratory performance test methods
ISO 12944-7. Paints and varnishes — Corrosion protection of steel stru cturer by protective paint systems — Part 7.’ Execution and supervision of paint work
3.8
protective paint system
sum total of the coats (11) of paints (3.6) or related products which are to be apphed or which have been applied to a substrate (3) to provide corrosion (3.2) protection
3.9
substrate
surface to which the coating material is applied or is to be applied
Note 1 to entry: The substrate is considered to be carbon tteel
3.10
spot repair
localized repair (including surface preparation) of deteriorated corrosion (3.2) protection system
3.11
partIal refurbishment
spot repair (i1)) of coating defects followed by surface preparation and application of a minimum of one top coat (3.1) over the whole area
3.12
total refurbishment
total removal of protective paint (3.6) system and application of a new one
3.13
sample area
area on which the propernes ola newly applied coatIng are tested
4 General introduction to the Iso 12944 serIes
4.1 Summary
ISO 12944 (all parts) deals with the corrosion protection of steel structures by protective paint systems.
4.2 Protective functions covered
ISO 12944 (all parts) covers only the corrosion.protectlve function of paint systems. Other protective functions, like protection against
— microorganisms (marine fouling, bacteria, fungi. etc.).
— chemicals (acids, alkalis, organic solvents, gases. etc.).
— mechanical action (abrasion. etc.), and
— fire
are not covered by ISO 12944 (all parts).
4.3 Field of application
4.3.1 OvervIew
The field of application Is characterized by
— the type of structure.
— the type of surface and surface preparation.
— the type of environment,
4,3.7 DurabIlity of the protective paint system
ISO 12944 (all parts) considers four different durability ranges (i.e. low, medium, high. and very high). See 15 and Cbuse S.
The durability range is not a guarantee tlme.
S General considerations and requirements
Si Since the durabehty of a protective system is normally assumed to be shorter than the expected service life of the structure, additional considerations shall be given at the planning and design stage to the possibility of their maintenance or (partial or total) refurbishment,
Sample areas provide guidance on the type of refurbishment and can also be used for the assessment of the visual appearance.
5.2 Structural components which are exposed to corrosion stresses and which are no longer accessible for corrosion protection measures after assembly shall be provided with corrosion protection that will remain effective, and hence ensure the stability of the structure, for the duration of the service life of the structure. If this cannot be achieved by means of protective coating systems, other measures shall be taken (for example, manufacturing components from corrosion.resistant material, designing components so that they are replaceable or the specification of a corrosion allowance),
5.3 The cost-elTectiveness and sustainability of a given corrosion protection system will generally be in direct proportion to the length of time for which effective protection is maintained, since the amount of maintenance or replacement work required during the service life of the structure will be reduced to a minimum.
5.4 The type of environmental conditions (4.14) and the durability of coatings systems (5.5) are the main parameters for selecting the coating systems.
5.5 The level of coating failure before the first major maintenance painting shall be agreed upon by the interested parties and shall be assessed in accordance with ISO 4628-1, ISO 4628-2, ISO 4628-3, ISO 4628-4 and ISO 4628-5. unless otherwise agreed between the interested parties.
For example, the first mafor maintenance painting would normally need to be carried out for reasons of corrosion protection once about 10 % of the coatings have reached Ri 3. as defined in ISO 4628-3. This requirement may be applied to the whole structure or to representative sections as agreed upon between involved parties. which may then be classified separately.
In this document, durability is expressed in terms of four ranges:
— low(L)upto7years;
— medium(M)7yearstolsyears:
— high (H) 15 years to 25 years:
— very high (VH) more than 25 years.
The durability range is not a guarantee time. Durability is a technical consideration/planning parameter that can help the owner setup a maintenance programme. A guarantee time is a consideration that is the legal subject of cbuses in the administrative part of the contract. The guarantee time is usually shorter than the durability range. There are rio rules that link the two periods of time.