Issue
Are stainless steel pockets suitable for use in seawater/saltwater applications?
Product Line
Field Devices.
Environment
STR Sensor.
Cause
Customer asking if stainless steel pockets are suitable for use in seawater/saltwater applications. Please note that the answer would need to cover both static (stationary) water and flowing water in the pipe, because seawater/saltwater has different effects on metals depending on whether it is moving or not.
Resolution
Highest corrosion class is Class III for stainless steel, which seems not suitable for intended application.
| ISO 12944 | Impact | Interior | Exterior |
| C1 | Very low | Heated buildings with clean air, such as offices, shops, schools, hotels, etc. | None |
| C2 | Low | Buildings not heated, where condensation may occur, such as warehouses and sports halls. | Atmosphere with low pollution. For example in the country. |
| C3 | Middle | Buildings for production with high atmospheric humidity and some air pollution such as food manufacturers, breweries, dairies and laundries. | Urban and industrial areas, moderate sulphur dioxide pollution. Coastal areas with low salt content. |
| C4 | High | Chemical manufacturers, swimming baths and ship- and boatyards by the sea. | Industrial areas and coastal areas with moderate salt impact. |
| C5-I | Very high - Industry |
Buildings or areas with almost permanent condensation and with high pollution. | Industrial areas with high humidity and aggressive atmosphere. |
| C5-M | Very high | Buildings or areas with almost permanent condensation and with high pollution. | Industrial areas with high humidity and aggressive atmosphere. |
