In this article, we present a series of specifications for the application of coatings in an already determined structure.
By Juan Manuel Álvarez*
Situations arise in which it is necessary to establish specifications for a company or for a particular contract, therefore it must be based on basic and specific information, with which it is possible to establish the required specifications.
In this article we will take as an example the need to establish coating specifications on an already determined structure.
Obviously there are standards that can be selected as a reference to adopt the "within the company" or for the "contract in particular", which would be the most practical and of course would have a quality support that would require compliance. But for our example, we take as a basis that it is required to establish an own specification by cost effect, ease of compliance by process, ease of compliance by measurement, correlation with product recommendations or own design.
The basic information referred to at the beginning of this article refers to the "Tests" that are required to be performed (objective to be met), as well said in the previous article. For our example let's consider the following minimum tests to be performed to estimate the level and time of protection of a coating:
1. Dry film thickness.
3. Film continuity (micro hole detection).
Regarding the three tests mentioned, there are different "Standards" from which one could be selected that is related to the product to be applied, the "Equipment" (utensil or tool with which the procedure is measured or managed to be performed) and the "Technique" (principle on which the equipment required for the test is based).
The specific information that is required to establish the specifications required to adopt the "within the company" or for a "particular contract", correspond to the following:
1. Scheme and protection system (general or by zones, depending on the configuration of the structure and substrate material).
2. Product environment (storage temperatures, mixing, application, drying and service).
3. Application equipment.
4. Application environment (cabin, workshop, field).
5. Periodicity of work for inspection monitoring (by test and location or sampling).
6. Periodicity of maintenance work (repair or replacement of the coating).
7. Periodicity of work for preservation (cleaning of the coating, care – inhibitors, lubricants, packaging).
Once you have the information of the seven items, they must be geared to establish the specifications that you want to meet: if the existing standards are taken as a reference base, for compliance, only the specifications designed in each of the tests can be more restrictive; for which they will result in greater durability, maintainability, repairability; equipment that with the highest reading accuracy can be used, more reliable techniques or better resolution or sensitivity, etc.
It is known to those who have reviewed (procedure or contract, versus, technical data sheets of equipment for example) or evidenced (making measurements and verifying accuracy and deviation) that it does not always correspond as would like in terms of quality.
Final quality that refers to how a product must respond to the protection of a structure against environmental requirements (chemical, physical or mechanical). Only when the specific is taken into account and properly engaged, it will be possible to have a specification that meets expectations and that is strictly complied with in the field, from the operational and from the functional. Therefore, I recommend that you have as a knowledge base, for its applicability, the information contained in the articles of the "Normativity" cycle presented this year in this journal.
The determination of specifications specific to the "within the company" or for a "particular contract", requires the knowledge and experience of the certified inspector who endorses such specifications, and who determines the scope of the standards that are taken as a reference to give the quality supports, such as, for example, the already standardized standards, which, being more restrictive in their design, offer greater or better quality controls to ensure the guidelines that are they expect, and they are directly related to maintenance costs, in particular to corrosion or corrosion control costs.
For the cycle of "Normativity" and in particular for this article I took as a reference the criteria of "Maintenance Management", the indicators of "Reliability Management", and the experience in the field as "Maintenance Inspector", certifications that this server has.
For purposes of extension, applicability, concerns or queries gladly through our editor.
As always I wish you a good aging and many successes in your work.
Note: All the data recorded in the 10 tables taken as an example must be consistent between equipment, technique, method and procedure to be complied with for the design of the quality specification "within a company" or for a "particular contract".
*JUAN MANUEL ÁLVAREZ RODRÍGUEZ
- Designer for Corrosion Control, Certified Coating Inspector, Corrosion Technician and Marine Coating Inspector (NACE International, the Corrosion Society).
- NACE member of the committees Coatings and Linings, Cathodic/Anodic Protection, Corrosion Management, Process Industry—High Temperature, Corrosion Mechanisms, Corrosion Monitoring and Measurement, Economics of Corrosion, Mechanisms of Pitting Corrosion.
- A.S.T.M. member of the committees of corrosion, paints and coatings, fuels, general aviation, adhesives, nondestructive testing and composites.
- ICONTEC (Colombia) member of technical committees in Paints, fuels.
- Certified Instructor ICAO (International Civil Aviation Organization).
- Inspector in Non-Destructive Tests.
- Instructor, lecturer and columnist in Paints and Corrosion.
- Specialist in Metal Structures and Composite Materials.
- www.juancorrosion.com [email protected]
- Advisory Services, Inspections, Training and Contracts for the Control and Prevention of Corrosion