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Surface cleanliness has been measured visually for the past 30 years using SSPC –VIS- 1 (ISO 8501-1) reference photographs. This method, while recognized as the industry standard, does have its disadvantages. It is deemed a subjective measurement rather than objective and is vulnerable to human error.
Surface cleanliness has been measured visually for the past 30 years using SSPC –VIS- 1 (ISO 8501-1) reference photographs. This method, while recognized as the industry standard, does have its disadvantages. It is deemed a subjective measurement rather than objective and is vulnerable to human error. This can be from experience level of the user to the condition of the visual reference chart itself; this often causes difficulties between operators, quality control and inspection personnel. There is also a great deal of external conditions that can affect the desired results wishing to be obtained, such as artificial light conditions and proximity of where the measurement is taking place.
Modern design, manufacturing and field-testing specifications include surface profile and adhesion testing on the assumption that they are linked to long term corrosion prevention. There are a number of careful studies, dating back decades, that find no link between measurements of adhesion and (undercutting) corrosion performance, but other studies do, and the concept remains intuitively appealing and widely assumed.
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With more stringent silica regulations being enforced, wet abrasive blasting is becoming more prevalent in the industry. We investigated the viability of wet abrasive blasting as compared to the more commonly used dry abrasive blast. One added benefit of wet abrasive blasting is the removal of soluble salts in addition to providing the specified profile.
When a coating disbonds from a structure and prevents cathodic protection (CP) from reaching the metal surface, this is known as “shielding” behavior by the coating. Shielding is a serious issue that has been a contributing cause for several pipeline failures, and expensive replacement programs. There are many factors (Soil resistance, holidays, coating resistance, etc.) that determine whether the coating will behave this way. Federal regulations for transmission gas pipelines require the use of a non-shielding coating.