Inspection of coating on steel structures
If you use a certified paint inspector, you ensure that the corrosion protecting coating on your steel structure is well performed and stays intact and effective for a long time.
Similarly, if your request is assessment of the state of existing coating and subsequent repair painting, we can assist you in obtaining the optimal process and quality.
Protect your steel structure against corrosionWind turbines, bridges and other structures of steel are exposed to wind and weather that make them corrode and reduce their service life. Paint and galvanization are used to protect steel surfaces against corrosion attacks, but if these coatings are not applied correctly, the protection is not effective.
Your paint inspector can inspect and approve the painting during the process. During the inspection, we identify and point out possible flaws and deficiencies in order for the surface provider to correct them immediately. Thus, we ensure good protection of your structure.
It is also far more economic to correct flaws and deficiencies during the production process than to repair them later on. Especially for the offshore sector where certain parts of the structures often are impossible to repair on-site, thus entailing a risk of a reduced service life.
Examples of flaws and deficiencies are:
- Too low paint film thickness and/or zinc coating
- Too high salt concentrations on steel surfaces
- Insufficient roughness of steel surface after sand blasting
- Dry spray where the paint does not form a coherent paint film before drying
- Insufficient cleaning of oil contamination on the surface
- Wrongly mixed paint, or storing too cold or too hot
- Too high humidity under paint application
- Dirt in the paint
- Badly performed stripe coating so that the paint does not enter hard-to-get-at areas
- Pinholes or blisters in the hardened paint.
Intact and correctly applied paintingThe paint inspection already starts during the preparation work where for instance we check the steel structure for sharp edges, which can be difficult to cover with sufficiently thick coats, and surface flaws, which can impede effective cleaning by sand blasting. The quantity of salts on the surface is also checked, as too high levels may lead to blisters in the paint later.
After blasting the paint inspector checks that the surface is clean, and that the roughness is adequate to ensure good adherence.
Temperature and relative humidity before, under and after application also have an impact on the durability of the coating. Therefore, the climate is checked several times during the process. This is particularly important when the coating takes place outdoor, or in other places where the climate cannot be controlled.
A coating is typically built of more layers of paint including e.g. a zinc or aluminium-rich priming. Between each layer and after the last layer, we check that the film thickness is correct, and that the coating has been applied without flaws, which may cause deterioration of its capability to protect the structure.
A coating only protects as long as it is intact and adheres to the steel surface, and therefore we check the adherence properties of the fully hardened coating – often on test plates produced for the occasion.
Good inspection ensures that your surface provider has performed his job correctly without deficiencies and has followed the specifications leaving your steel structure – regardless whether it is a wind turbine, a bridge, a tank or something else – optimally protected against deterioration by corrosion.
Certified and professional inspectionFORCE Technology’s inspectors are all FROSIO-certified (NS 476) and independent ensuring impartial and professional inspection of your coating.
The inspections are as starting point based on relevant norms and standards for coating, for instance DS/EN ISO 12944, DS/EN ISO 1461 and NORSOK M-501 and the requirements you have stated for the coating work in your specifications.
With a third party inspection of the work, you ensure durable and lasting protection against corrosion.
Contact us if you have any questions regarding paint inspection or need to have your paintwork inspected.
- Article: Offshore windfarms - successful corrosion protection combined with effective quality management
- Product sheet: When were you last inside the wind turbine?
- Brochure: Surface treatment - Consultancy and inspection
- Brochure: Maritime services (pdf)
- Brochure: Oil & Gas Offshore Services (pdf)
- Brochure: Wind Energy Services (pdf)
- Paper: EUROCORR 2014 Durability of coating repair systems for offshore services (pdf)
Consultancy on specification for coating
Selecting an effective coating ensures a proper protection of your steel construction
Organisation and planning of operation and maintenance procedures
Avoid downtime and unexpected repair by organising and planning your maintenance.
Materials selection and corrosion protection
Select the correct materials and optimal corrosion protection to get the best conditions for keeping the functionality...