WHEN INSTALLING USED PIPE IN A LIQUID TRANSPORTATION PIPELINE FOR A HAZARDOUS SUBSTANCE, WHAT PERCENT OF THE OLD GIRTH WELDS MUST BE GIVEN A NON DESTRUCTIVE TEST

WHEN INSTALLING USED PIPE IN A LIQUID TRANSPORTATION PIPELINE FOR A HAZARDOUS SUBSTANCE, WHAT PERCENT OF THE OLD GIRTH WELDS MUST BE GIVEN A NON DESTRUCTIVE TEST