![]() DOT or TC) must be carefully reviewed for compliance and selection of the visual examination method appropriate for the cylinder undergoing requalification. Pertinent regulations for the specification of cylinder being requalified (e.g. Some specification cylinders operating in certain gas services may be requalified exclusively by a visual examination. The exam may be both internal and external or, in some cases, external only. In fact, most cylinders are rejected because of a finding during a visual examination. Visual examination of a cylinder is a part of any requalification process and should be performed before applying pressure. DOT Specification cylinders must have a Requalifier Identification Number (RIN) issued by DOT upon the recommendation of an Independent Inspection Agency (IIA). ![]() ![]() Whether domestic or international, persons requalifying U.S. Regulatory approval of the test facility, personnel and equipment is required for cylinder requalification. This article will explain the varied methods and reasons for selecting a particular method. But, in most cases, DOT regulations or special permits issued by governing bodies will offer choices. (NOTE: Throughout this article the word cylinders includes tubes, unless specifically noted.) For some specification cylinders, there will be only one approved method. First and foremost is the specification of the cylinder or tube that is being tested. The choice of requalification method will be based on a variety of factors, including cylinder specification, gas service and purity level, authorized requalification cycle, location, turnaround time, and price. What tests do I need done to get my cylinders and tubes requalified?Ī. Government Printing Office, Washington, DC 20401. Requalification means the completion of a visual inspection and/or the test(s) required to be performed on a cylinder to determine its suitability for continued service.” Code of Federal Regulations, Title 49 (Transportation) Part 180, Section 180.203, Definitions, Superintendent of Documents, U.S. Categories Blog, Compressed Gas, Compressed Natural Gas, Equipment, Regulations, Requalification, Resources, Safety, Tube TrailerĪ.
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