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Old 10-29-2015, 12:32 AM   #221
Northern Spy's Avatar
City: Powell River, BC
Country: Canada
Vessel Name: Northern Spy
Vessel Model: Nordic Tug 26
Join Date: Feb 2012
Posts: 2,317
Repowering with a Tractor Motor

IIRC, your riser is sch40, 316SS. You may ask him or a weld shop to clean, pickle, and passivate the riser. This would not only make it shiny again, but it would enhance the corrosion resistance of it, particularly the heat tint on the welds. Shouldn't take much time or cost much. Material is available at most weld shops, usually 20% nitric acid in a spray or gel, but citric acid is also commonly used.

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