Before revision: References Further reading American Petroleum Institute (API): Safe Hot Tapping Practices in the Petroleum & Petrochemical Industries, API Recommended Practice 2201, 5th edition, July 2003.
After revision: EMPRESAS SUMINISTRADORAS DE ESTE SERVICIO: www.congelatube.eswww.congelatube.esReferences Further reading American Petroleum Institute (API): Safe Hot Tapping Practices in the Petroleum & Petrochemical Industries, API Recommended Practice 2201, 5th edition, July 2003.