PaintSquare.com


The First Word in Protective & Marine Coatings

A Product of Technology Publishing / PaintSquare
JPCL | PaintSquare News | Durability + Design | Paint BidTracker

Resource Guide Extreme Temperatures

Problem Solving Forum

| More

September 5 - September 11, 2011

Is it necessary to holiday test the interior lining in the vapor phase (roof) of water storage tanks after coating?



More items for Quality Control


Selected Answers

From Lee Edelman of Independant on September 5, 2011:
Usually, a holiday test is done below the overflow level, unless the specification calls for the roof section to be holiday tested. I recommend testing the roof section after a cure test is completed. Holiday testing will help to extend the life of the coating system. Care should be taken when testing the roof section. Usually, there are faying surfaces, spot welds, or seams not sealed. Depending on the type of tank, these surfaces will cause the holiday detector to go off. A visual inspection before holiday testing will let the inspector know where these areas are.

From Gunnar Ackx of SCICON worldwide bvba on September 6, 2011:
Because of the (economic) consequences of having to take  a storage tank out of service for inspection and/or maintenance, I believe it is warranted for ANY immersion-service tank lining to be holiday-tested 100%, including the vapor phase, which is often MORE aggressive than the immersion service itself.


Only if the vapor phase is confirmed to be non-corrosive (or nitrogen blanketed), then maybe no testing is required, but in all other cases, I would definitely holiday-test the vapor phase as well.

Actually, the vapor phase and the bottom of the tank are the areas where most corrosion occurs, so also make sure that you look at the "design" of the storage tank to make sure that it allows for proper coating application (steel dressing, accessibility, crevices, etc.).

Of course, the above is only the tip of the proverbial iceberg, as I consider (qualitative) tank lining to be a specialty art within the coating profession.

Please sign in to submit your answer this question    

Tagged categories: Tank interiors


Current PSF Question | Submit a PSF Question | Full PSF Archive

Elcometer, Inc.
New Elcometer 456 Coating Thickness Gauge

Best In Class Just Got Better. Technologically Intelligent And Robust. Marvelous Design And Durability. An Earth-Shattering Revolution In Coating Inspection.


KTA-Tator, Inc. - Corporate Office
KTA-TATOR LABORATORY SERVICES

• Coating failure analysis
• Independent
  comparative testing
• Accelerated
  weathering testing
• Toxic metals testing
• A2LA Accredited
800-245-6379


DeFelsko Corporation
PosiTector Dew Point Meter

Measures and records
environmental conditions
during surface prep and
painting. 4 Models
Available – Standard
or Advanced features,
Built-in or Separate probe.


DRYCO
DEHUMIDIFICATION FOR
ANY SIZE PROJECT!

Temporary climate control equipment. Dehumidifiers,
Heaters, A/C, Power, More…
Toll Free: 866-379-2600


Mitsubishi Gas Chemical America
Performance Amine 1,3-BAC

A highly reactive cycloaliphatic diamine offering superior performance. Reasonable cost and curing efficacy makes it suitable for all types of epoxy resin applications.


Sherwin-Williams
Heat-FLex® Hi-Temp 1200

Improved Corrosion
Resistance
Enhanced Durability
Faster Shop Throughput


Hempel (USA) Inc.
HEMPEL PROTECTIVE COATINGS

Efficient systems and high quality products to reduce your maintenance costs. Visit Hempel Protective for more information.

 
 
 
Technology Publishing

The Technology Publishing Network

The Journal of Protective Coatings & Linings (JPCL) PaintSquare
Durability + Design Paint BidTracker JPCL Europe

 
EXPLORE:      JPCL   |   PaintSquare News   |   Interact   |   Buying Guides   |   Webinars   |   Resources   |   Classifieds
REGISTER AND SUBSCRIBE:      Free PaintSquare Registration   |   Subscribe to JPCL   |   Subscribe to PaintSquare News
MORE:      About PaintSquare.com   |   Privacy policy   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us
 

© Copyright 2000-2014, Technology Publishing / PaintSquare, All rights reserved
2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951; Tel 1-412-431-8300; Fax 1-412-431-5428; E-mail webmaster@paintsquare.com