Per-Cleaning
Painting

Pre-Cleaning:
All surfaces must be cleaned to remove
   OIL, grease, old paint, dirt and other
   contamination.
Large quantities of oil, grease, eureka,
   Royal Rust Coat will be physically removed by
   scrapping using scrappers,putty knives or
   Chisels.
All remaining OIL, grease, loose paint or
   other contamination must be removed by
   application of a biodegradable water based
   surfactant type cleaner approved by the
   manufacturer of the coating being applied
   followed by low pressure fresh water
   cleaner.
 
Surface Preparation:
Surface should be prepared in accordance with the recommendations of the paint
   coating specifications and product data sheets.
When tested surfaces are shown to contain more than 10 Ug/cm2 of Chlorides, this
   surface shall be high pressure water cleaned (HPWC) with clean fresh water and
   any recommended additives as per the data sheet.
Checking the salt and Chloride content on the surface using salt detection kit #
   134 Elcometer, Chlorides content on the cleaned surfaces should not exceed 7
   Ug/cm2.
Cleaned surfaces may have to be washed with the freshwater / de-chloride wash
   solution more than once until this limit of Chlorides is reached.
Since most of our surfaces are subjected to aggressive and severe conditions, the
   blasting standard required and which will be achieved is Sa - 2.5  (NACE 2/sspc - sp
   10 - 63), or (ISO 8501 - 1 Sa - 2 1/2) "near white" blasting cleaning using Garnet
   as an abrasive with 20/40 to 30/60 mesh size - No recycle , "Clemco" American
   made blasters, 200 lit capacity, with remote control and breathing apparatus are
   going to be used.
Surface profile 2 - 4 mills RMS is to be obtained - Elcometer 123 surface profile
   gauge to be used.
Weld seams, metal silvers, sharp edges, weld spatters will be removed, using power
   tools to provide a uniform, non-polished surface. Sharp edges to be rounded by
   grinding to approx. 2mm radius, as paint coatings tend to run away from sharp
   edges, resulting in thin coating and reduced protection. The usage of power wire
   impact tools, power wire brushes, power wire sanders should physically kept very
   limited because it may lead to the smoothening and polishing of the metal surface
   and finally destroying the surface profile - peaks and valleys - that will reduce the
   key for the subsequent paint coating.
Blasted surfaces shall be coated with one coat of primer during the same day that
   blasting was done and before any visible deterioration occurs.
If before painting the surfaces become contaminated in anyway or oxidation has
   occurred, surface preparation is to be repeated.
All abrasive and dust from blasting operation shall be removed from surfaces before
   painting application, by brushing and sweeping.


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