The choice of re-qualification testing method for portable cylinders is based on a variety of factors. In most cases, DOT regulations offer choices.
This 5 part article discusses the different choices when it comes to re-qualification testing methods for portable cylinders. Each part will identify the type of re-qualification testing method and provide a brief description of each. These choices include such methodologies as:
- Visual Examination Method
- Hydrostatic Testing Methods
- Water jacket method
- Direct expansion method
- Proof pressure method
- Acoustic Emission Method
- Ultrasonic Examination Methods
- Automated ultrasonic examination
- Hand-held ultrasonic examination
- Other Test Methods
Part 1 addresses the Visual Examination Method, Part 2 will address Hydrostatic Testing Methods, Part 3 will address Acoustic Emission Method, Part 4 will address Ultrasonic Examination Methods and Part 5 will address Other Test Methods.
Visual Examination Method for re-qualifying portable cylinders
Visual examination of a cylinder is a part of any re-qualification process and should be performed before applying pressure. In fact, most cylinders are rejected because of a finding during a visual examination. The exam may be both internal and external or, in some cases, external only. Some specification cylinders operating in certain gas services may be re-qualified exclusively by a visual examination. Pertinent regulations for the specification of cylinder being re-qualified must be carefully reviewed for compliance and selection of the visual examination method appropriate for the cylinder undergoing re-qualification.
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Jay L Harman’s DOT Hydrostatic Testing and Ultrasonic Examination facility and equipment meet all NFPA requirements for the hydrostatic testing and Ultrasonic Examination of compressed gas cylinders and portable fire extinguisher cylinders.
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