This is a short monograph on the appearance of a rusty surface cleaned with water blasting (hydroblasting) (waterjetting).monograph Grey Steel profile under corrosion 2017-07-31
The 2016 WJTA-IMCA is a two day filled meeting with practical talks and demos. The registration is $30 (one day) to $45 (2 day). The WJTA_IMCA features a panel discussion on the Future of the Industry which includes contractors, owners, and equipment manufacturers :
Jim Ashmead, E.I. DuPont
Rawlin Brown, StoneAge, Inc.
Bradley Coble, PSC
Andrew DeBusk, DeBusk Service Group
Terry Gomes, Terydon, Inc.
John Hodges, Evergreen Industrial Services
Liam Kearney, J. Hvidtved Larsen US, INc.
Gary Noto, HydroChem LLC
Click on this link to get further information.
For 30 years, I have received questions about the quality of water that should be used for removal of coatings. How much dissolved material or minerals gets left on the surface? Just recently after an hour long webinar to 200 people, the question was “What should the quality of the water be?”
Among the first comments which I received on the WJ standards documents came from Singapore: The complaint was that we didn’t advocate cleaning with brackish or filtered seawater.” Just recently in 2015, a Sherwin Williams representative talked about the methodology in Brazil where WJ was being used for primary surface preparation, and not just potable water. However, I also received call in the mid 190’s where contractors said that they could tell the difference of quality of water between municipality sources. The better the quality of water, the better the removal, and the less flash rust.
As a task group leader for NACE and SSPC, the task groups finally defined surface preparation water. Surface Preparation water is water of sufficient purity and quality that it does not prevent the surface being cleaned from achieving the WJ-1 degree of surface cleanliness or nonvisible contaminant criteria when contained in the procurement documents. SP water should not contain sediments or other impurities that are destructive to the proper functioning of the cleaning equipment.
The following is a monograph on
The Quality of Water to be used in Surface Preparation and to Protect the Pumps.
EVALUATION OF 20,000 PSI WATER JETTING FOR SURFACE PREPARATION OF STEEL PRIOR TO COATING OR RECOATING
This is the original white paper monograph which is the basis for removal of paint and coating system by high pressure waterjet cleaning HP-WJ. Prepared by Lydia M. Frenzel; Dr. Robert De Angelis, and Dr. John B. Bates, 1983
At the time, 20,000 psi (140 mPa) was the upper limit on the cleaning equipment. Click on the link to download the pdf paper.