Spark Test A technique used for confirming the integrity of the protective coating on a steel underground composite tank, prior to the tank’s installation. See also Composite tank and Holiday. By rhys|2014-10-22T19:03:08+00:00October 22nd, 2014|Comments Off on Spark Test Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkXingEmail About the Author: rhys