NACE 3 Finish

To ensure a good bond of the repair sleeve to the pipe, Clock Spring Company L.P. recommends a NACE 3 (NACE #3), or equivalent finish on the pipe surface being repaired with Clock Spring®.

Definition:

Commercial Blast Cleaning

A Commercial Blast Cleaned Surface Finish is defined as one from which all oil, grease, dirt, rust scale and foreign matter have been completely removed from the surface and all rust, mill scale and old paint have been completely removed except for slight shadows, streaks, or discolorations caused by rust stain, mill scale oxides or slight, tight residues of paint or coating that may remain; if the surface is pitted, slight residues of rust or paint may by found in the bottom of pits; at least two-thirds of each square inch of surface area shall be free of all visible residues and the remainder shall be limited to the light discoloration, slight staining or tight residues mentioned above.

Equivalent Power Tool Cleaning

Other related standards include:

• SSPC-SP-3  (Steel  Structures  Painting  Council/The Coatings Society)
• St  3  (Swedish  Standards) Power Tool Cleaning 

Removal of all rust scale, mill scale, loose paint, and loose rust to the degree specified by power wire brushes, power impact tools, power  grinders,  power sanders or  by a  combination  of  these methods. The substrate should have a pronounced metallic sheen and be free of oil, grease, dirt, soil, salts and other contaminants. Surface should not be buffed or polished smooth.