Application (if not specified under others) | Surface preparation | Coating system | Minimum DFT μm |
Carbon steel with maximum operating temperature < 120 °C | Cleanliness: | 1 coat zinc rich primer: | 60 |
· Structural steel | ISO 8501-1 Sa 2½ | Minimum number of coats: 3 | |
· Exteriors of equipment, vessels, piping and valves (not insulated) | Roughness: ISO 8503 – Grade Medium G (50 μm to 85 μm, Ry5) | Minimum DFT of complete coating system: | 280 |
NOTE 1 If the second coat is not applied immediately after a zinc rich primer has cured, or if the primer is exposed to humid or outdoor conditions prior to application of the second coat, a tie-coat/sealer shall be applied on top of the primer immediately after the primer has cured to prevent oxidation of the zinc. This tie-coat/sealer shall either be of a thickness below 50 μm or prequalified as a part of the coating system. | |||
NOTE 2 When this coating system is used for accessible deck areas, a non-skid aggregate shall be added to the second last coat. Prior to applying the coating where the non-skid aggregates are added, the primer and the succeeding coat(s) shall be applied to a minimum DFT of 175 μm and fully cured. | |||
NOTE 3 Chalking rating 1 (see Table 1) or better should be preferred for externally exposed surfaces. | |||
NOTE 4 For the splash zone area, the coating system shall also fulfill the pre-qualification requirements for coating system no. 7 | |||
NOTE 5 Zinc rich primer shall be in accordance with ISO 12944-5. | |||
NOTE 6 Specialized coating systems with at least two coats and without zinc rich primers, may be selected for particularly exposed areas on installations provided the coating system is pre-qualified in accordance with 10.1, the coating thickness is ≥ 1000 mm DFT and provided relevant successful field experience is documented. |
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Tel: +39 0332 730 102
Fax: +39 0332 746 446
E-mail: info@metalsystemsrl.com
PEC: metalsystemsrl1@legalmail.it
Via Rovera 42/A 21026 Gavirate (Va)