Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.
solids coating or a lining, what you get today is what you get tomorrow. When you are applying a 63 or 83% solid lining, the difference in solid content will evapo- rate and you will have to come back the next day to compensate for the material that is not there anymore. The greatest advantage of the 100%
A sometimes even four coats. A
Repairing underground closed blowdown lines
inorganic zinc silicate. Lately we have observed leaks from these lines at a number of locations in the unit. A few of the locations that were excavated showed external corrosion and grooving, so ap- parently it is a case of external corrosion. Can someone share experiences
Q
to go. If not, repair the existing damaged XQXM ,M\MZUQVM IVa ZMO]TI\WZa ZMY]QZM- ments for the repair project. Apply an underground protective coating to the repaired areas. Consider installing ca- thodic protection (CP) on the pipe for
A NACE International, Vol. 51, No. 4 April 2012 MATERIALS PERFORMANCE 41
regarding the method/philosophy for repairing such leaky lines in a running ]VQ\ WN I ZMÅVMZa' .]Z\PMZ _W]TL KWV^MV- tional hot-wrapped coating improve the [MZ^QKM TQNM IVL ZMTQIJQTQ\a WN []KP TQVM['
.QZ[\ LM\MZUQVM \PM VI\]ZM IVL extent of the corrosion damage. If too much pipe is damaged, then replacement may be the way
We have an under- ground network of car- bon steel closed blow- down lines coated with
solids coatings and linings is that you are able, in most cases, to reach your recom- mended thickness in just one application.
I used to work with a coating that, when applied at 30 mils (0.76 mm) thick, required three coats \W ZMIKP \PM ÅVIT ,.< WN
UQT[#
When we talk about 100% solids vs. 63 or 83% of solids, we are talking about two different ani- mals. When you apply a 100%
M`\MVLML KWZZW[QWV KWV\ZWT .QVITTa LM- velop a corrosion control program for your steel structures subject to corrosion. A protective dielectric coating and a
CP system are very effective and eco- nomical methods of service life extension for buried steel pipe. NACE International is a very good source of information, as well as other operators in your industry.
Blasting in desalination plant evaporators
Q
I just returned from a site where evaporators in a desalination plant are being blast-cleaned
Continued on page 43