Blasting on coated surface

[Syahar1975]

Dear experts,

We need to full blast (remove the existing shop prime 40 micron DFT) to get SSPC 10 standard.

The question is : is there any rule of thumb on how many percent garnet consumption to be added comparing to blasting on bare metal. Let say for bare metal we consume 20 Kg of garnet/M2 to get SSPC 10 standard. How much garnet do we need If we blast the shop primed surface to get SSPC 10?

Syah

 

[TugboatEng]

It really varies a lot based on the thickness of the coating and how soft it is. Soft/resilient coatings are very difficult to remove by blasting. The operator will generate much variance as well. Maybe you can work out a deal with your supplier where they must buy back unused media. The company providing the media may also be able to provide some kind of estimate.