Accession Number:

ADA454092

Title:

Adaption of Japanese Prefabrication Priming Procedure to U.S. Shipbuilding Methodology Task 3-79-1

Descriptive Note:

Corporate Author:

AVONDALE SHIPYARDS INC NEW ORLEANS LA

Report Date:

1987-08-01

Pagination or Media Count:

69.0

Abstract:

The U.S. and Japanese Marine shipbuilding coating practices currently involve the application of a reconstruction primer to blast cleaned steel prior to fabrication. After fabrication, the Japanese incorporate this primer into the protective coating system after minimal cleaning Steel Structures Painting Council SSPC-SP3 , Power Tool Cleaning . In contrast, the U.S, removes this primer by blast cleaning in accordance with Steel Structures Painting Council SSPC-lQ, Near-White Slast Cleaning followed by the application of a new inorganic zinc primer and the remainder of the coating system. The result is an escalation in the U.S. costs of coating application as compared with the Japanese methodology. If the Japanese approach provides adequate performance, a significant cost savings would result. In order to investigate this, Avondale Shipyards acting on behalf of the Maritime Administration under the National Shipbuilding Kesearch Program authorized KTA-Tator, Inc. to undertake a laboratory study to investigate the performance of six selected Marine coatings applied according to the U.S. and Japanese methodologies. Products from two Japanese suppliers and two U.S. suppliers were used. In general the results of four accelerated weathering tests six-month 1500 salt water immersion, cycled pressurized immersion at 80 psi head pressure, alternating uVheatimmersion cycling, and salt fog exposure show the U.S. methodology provides better performance in some cases, while the Japanese approach provides better performance in other. Overall, it appears that the Japanese methodology should be strongly considered for U.S. use.

Subject Categories:

  • Marine Engineering
  • Solvents, Cleaners and Abrasives

Distribution Statement:

APPROVED FOR PUBLIC RELEASE