February 20 - February 26, 2012
Some painting specifications call for the use of “Best Effort” in relation to blasting. How does one determine “Best Effort?”
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Erik Andreassen of CFPS on
March 26, 2012:
The term "Best Effort" is not a specification. Reject this terminology used by obviously someone who has little or no knowledge of our industry.
Christian Favennec of DCNS on
February 19, 2012:
According to my experience, best effort is never enough and is a subjective criteria. If you receive a specification where it is asked to perform "best effort,", you have to translate it in not subjective criteria that can be measured on field.
Criterias for degrees of blasting are defined in normalisation standards and correspond to level of cleanliness before painting (SSPC or ISO standards, for example). The degree of blasting depends on the kind of project (new building or maintenance), the environment, and the performance you want to reach.
The level of cleanliness before painting must always be associated with other criterias, for example: - Level of cleanliness: Sa 2 1/2 according to ISO 8501-1;
- Level of soluble salts : 3 µg/Cm²; according to ISO 8502-6 and 8502-9;
- Roughness: medium grit according to ISO 8503-1.
With these crierias, you can well perform your job according to not subjective results and pronounce the reception of the job before going on in the process of painting.
M Ehab of North Valley on
March 21, 2012:
Best Efforts have no physical meaning. The safer method is to follow Paint Data Sheet Surface Preparation Recommendations. If not available, blast to ISO Sa 2.5 (SSPC-SP 10/NACE #2 or similar grades). In case of HPFW. Hand/Power Cleaning ISO St2/St3 (SSPC SP-2/SP-3) if primer is a surface-tolerant coating.
Jim Brown of Corrosion Prevention on
February 21, 2012:
When conditions prevent an inspector from reaching, seeing or touching an area, the criteria of "best effort" will exist. The facility owner knows of the condition before and thus lists it in the RFP.
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