Final answer:
The expiration date for cylinder recertification is not typically found on the DOT cylinder's protective collar. This collar includes important information such as cylinder ID, test dates, test pressure, serial number, and manufacturer details, but not the expiration date of when the cylinder must be requalified.
Step-by-step explanation:
The information not found on the protective collar of a DOT cylinder is the expiration date of the cylinder's certification for use. The Department of Transportation (DOT) requires certain information to be displayed on the protective collar, but this does not typically include the date when the cylinder is no longer certified for use without reinspection or requalification.
The protective collar of a DOT (Department of Transportation) cylinder contains various important details but does not typically include the expiration date for when the cylinder needs to be recertified or requalified. Mandated information that can be found includes the cylinder identification, test dates, original test pressure, serial number, and manufacturer details. Additionally, it may list special notes or warnings pertinent to the cylinder's use, handling, or storage requirements.
Regulations per the DOT specify that the protective collar should contain information necessary to identify and verify the cylinder's compliance with DOT standards. This includes a specification number which informs users of the cylinder's type, followed by a serial number that uniquely identifies each cylinder. Next, a DOT mark signifies approval by the Department of Transportation, followed by test dates which mark the time of the last test or requalification of the cylinder in the form of month and year. Manufacturer details, such as the name or symbol of the maker, are also present.