- 338, 3rd Floor, Krish Arcade,
Nr. Adani Circle Ring Road,Ramol, Ahemdabad.
Technical Information
Why Surface Preparation?
Corrosion is a big menace to the economy of the country. The loss due to corrosion has flosses have been estimated approximately of 25,000 crores rupees per year due to the impact of corrosion according to the News letter NACE, India
Complexity of Corrosion Process
Annual Losses Due to Corrosion |
|
|---|---|
| Power Plants | Rs.5000 Crore |
| Chemical & Petrochemical | Rs.7000 Crore |
| Navy & Shipping | Rs.8000 Crore |
| Oil Drilling & Offshore Activity | Rs.8000 Crore |
| Oil/Gas Distributon | Rs.8000 Crore |
| Aircraft & Aerospace | Rs.3000 Crore |
| Infrastructure | Rs.5000 Crore |
| Miscellaneous | Rs.6000 Crore |
Total (3% GNP) Rs.50,000 Crore
Classification of Enviroment as per IOS Standerds |
|
|---|---|
| C1 | Mild Environment with low Humidity |
| C2 | Low RH & Condensation |
| C3 | Urban Industrial with SO2 |
| C4 | Industrial & Coastal - Chemical Plants |
| C5-1 | Industrial Zone With High RH |
| C5-M | Marine Offshore With High Salinity |
Qualities in Surface Preparations
| Description | Swedish SIS 05 5900 | American SSPC-SP | International ISO-8501-1 |
|---|---|---|---|
| White Metal | Sa 3 | SSPC-SP 5 | Sa 3 |
| Near White Metal | Sa 2 1/2 | SSPC-SP10 | Sa 2 1/2 |
| Commercial Blast | S2 | SSPC - SP 6 | SAa 2 |
| Brush-off blast | Sa 1 | SSPC - SP 7 | Sa 1 |
Initial Condition Of Steels Per ISo 8501-01
| Rust Grade | Pictorial Example | Description |
|---|---|---|
| A |
|
Steel Coveres completely with adherent mill scale and with if any rust |
| B |
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Steel surface which has begun to rust and from which the mill scale has begun to flake |
| C |
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Steel surface on which the mill scale has rusted away or from which it can be scrapped, but with little pitting visible to the naked eye |
| D |
|
Steel surface on which the mill scale has rusted away and on which considerable pitting is visible to the naked eye |
Pictorial example of surface preparation according to ISO 8501-01
| Cleaning Standard | A | B | C | D |
|---|---|---|---|---|
| Sa 1-Brush Of Blast | Not Applicable |
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| Sa 2-Commercial Blast | Not Applicable |
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| Sa 2.5-Near white metal |
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| Sa 3 – white metal |
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