PaintSquare.com


The First Word in Protective & Marine Coatings

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

Bridge Coating Systems: Selecting and Sourcing

Paint and Coatings Industry News

Main News Page


Guidelines on RH Levels for Coating Work Relaxed by Navy; Savings Expected

Wednesday, July 14, 2010

Comment | More

A project team of the National Shipbuilding Research Program (NSRP) has determined that higher relative-humidity conditions can be allowed in certain situations during surface-preparation and coating operations.

The determination will contribute to cost savings for tank-painting work performed during Navy ship construction and repair, the project team has concluded. Changes in a NAVSEA standard on relative humidity in such painting programs will take effect in the fiscal-year 2011 version of NAVSEA Standard Item (NSI) 009-32

The project team conducted a review of the technical basis for a current Navy requirement for relative humidity conditions for painting work in a shipboard tank or void space. In such projects, NAVSEA NSI 009-32 requires maintenance of relative humidity at a maximum of 50% from the start of surface preparation to cure of the topcoat. The standard “can be a significant cost driver in tank painting work performed during ship construction and repair,” the NSRP team stated in an announcement on its review and conclusions.

The project team conducted a review of the technical background of the current requirement, as well as literature and data from paint manufacturers. Then, working with NAVSEA and industry partners, the team developed proposals for solutions that relax the requirement in situations where the cost is high and the technical risk is insignificant.

The project team, led by Elzly Corp. for the NSRP Surface Preparation and Coatings Panel, explored a number of concepts to reduce the cost of this requirement while maintaining the high quality required by the Navy. As a result of the project, the requirement to maintain 50% relative humidity was relaxed to the less stringent 85% maximum relative humidity requirement for the following four situations:

• Recoating chain lockers and Collection, Holding and Transfer (CHT) tanks;

• Components painted in a shop for later installation in a tank;

• Small areas of “touch-up” work; and

• The period of time between cure-to-touch and full cure.

“The changes will have an immediate impact on the cost to paint Navy tanks where dehumidification is required due to the ambient relative humidity,” the project team said. “In U.S. shipyards, ambient relative humidity is below 50% only about 10% of the time. However, if painting can occur when relative humidity is as high as 85%, most shipyards can paint 80% of the time without dehumidification equipment.”

The panel noted that dehumidifying paint shops to meet the 50% requirement “can require millions of dollars worth of equipment. Allowing surface preparation and painting at 85% relative humidity obviates the need for such equipment and the energy to run it.

“In the drydock, dehumidification equipment results in cost and space constraints. The ability to move dehumidification equipment before touch up and full cure is completed means less equipment is needed for a series of tanks.”

The project Final Report is available for download here.

More information: National Shipbuilding Research Program, email nsrp@aticorp.org.

   

Tagged categories: Marine; Marine Coatings; National Shipbuilding Research Program; Surface preparation

Comment from Carl Mantegna, (7/15/2010, 3:29 PM)

Never apply any immersion coatings if the temperature of the substrate is below the dew point of the ambient air.


Comment Join the Conversation:

Sign in to our community to add your comments.

Hempel (USA) Inc.
HEMPEL PROTECTIVE COATINGS

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


Modern Safety Techniques
Modern Safety Techniques

With our unique LTCat, we can help to provide clean, safe breathing air to your workers. Take a look at our Breathing Air Systems, we supply at least twice as much charcoal as our competitors! Modern


Industrial Vacuum Equipment Corp.
Hurricane Vacuums
& Dust Collectors

Vacuum and dust collector hose, filters and related accessories.
IndustrialVacuum.com


Atlantic Design, Inc.
MORE THAN JUST A SALES PITCH!

Simplicity! Dependability! Safety! We’ve built these features into every cleverly engineered inch of our newest models. It’s all there. 866.Call.ADI


US Minerals
US Minerals -
Black Magnum

With nationwide production and distribution capabilities, U.S. Minerals supplies a complete range of coal slag and other abrasives to meet all of your blasting needs.


Abrasives Inc.
Check our Prices for Blast Abrasives

Faced with higher abrasive costs? We invite you to call & check our rates on Black Magic® coal slag and other quality blast materials. Abrasives Inc. 800-584-7524


LS Industries
LS Blasters: Optimum Steel Cleaning Efficiency

Simplify surface prep with the precise shot control of LS Blasters. Our blast technology delivers optimum coverage and finish. 800-533-8008

 
 
 
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