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https://ehssafetynewsamerica.com/2015/03/26/csb-releases-new-safety-video-entitled-shock-to-the-system-offering-key-lessons-for-preventing-hydraulic-shock-in-ammonia-refrigeration-systems/
"CSB Releases New Safety Video Entitled “Shock to the System” Offering Key Lessons for Preventing Hydraulic Shock in Ammonia Refrigeration Systems"