Details:

Alternative Title:
Energy Report: Method for Qualification of Coatings Applied to Wet Surfaces
Creators:
Gui, Feng
Corporate Creators:
Det Norske Veritas, Incorporated
Contributors:
Brossia, C. Sean
Corporate Contributors:
United States. Dept. of Transportation. Pipeline and Hazardous Materials Safety Administration
Subject/TRT Terms:
[+]
Adhesive Strength Performance Tests Pipelines Protective Coatings Relative Humidity Research Hub Testing Equipment Wet Surfaces
Publication/ Report Number:
ENAUS811-806407 08
Resource Type:
Tech Report
Geographical Coverage:
United States
TRIS Online Accession Number:
01642977
Corporate Publisher:
Det Norske Veritas, Incorporated
Abstract:
The field application of a pipeline repair or rehabilitation coating usually cannot wait until ambient conditions become optimal. In a humid environment, water can condense on the pipe surface because the pipe surface is usually cooler than the ambient air. For buried pipelines, the surface temperature is typically 40-60o F, which easily facilitates condensation on the pipe surface. In such situations, although the surfaces are not perfect for coating application, they have to be coated due to the need to backfill the excavation the site and rebury the pipe. To meet the requirements of applying coatings on wet surfaces, several coating manufacturers are producing “wet surface tolerant” products. The wet surface tolerance claim is based on the coating’s ability to displace small amounts of water on the surface during application. This does not address the fundamental problem that the coating must be able to cure, adhere, and maintain integrity when applied to a non-ideal substrate. Evaluation of suitable products by end-users is extremely difficult because it requires complete control of the steel surface during application and cure. The objectives of this work, therefore, were first to develop a testing rig that can simulate the conditions encountered in the field when conducting coating repairs. Coatings were then applied to pipe spool pieces in this testing rig for performance evaluation both in the lab and in the field. Secondly, a methodology was developed to screen and evaluate coating candidates for a specific application. Through this development process, critical parameters that can be used to evaluate the coating performance were identified.
Format:
PDF
Funding:
DTPH56-06-BAA-0001
Collection(s):
US Transportation Collection PHMSA Collection
Main Document Checksum:
[+]
urn:sha256:2eced334ab212b0f3e505f444d99991dbbf4ec9643c1b5541cb444377a5d250e
Download URL:
https://rosap.ntl.bts.gov/view/dot/34523/dot_34523_DS1.pdf
File Type:

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