The minimum design or service pressure of cylinders must comply with which regulations?

The minimum design or service pressure of cylinders is governed by regulations set forth by the Department of Transportation (DOT), specifically found in Title 49 of the Code of Federal Regulations (CFR). This is crucial because the DOT establishes standards for the safe transportation of hazardous materials, including liquefied petroleum gas (LPG). The specifications ensure that cylinders are constructed to withstand the pressures they will encounter during storage and transport, thereby preventing accidents and ensuring the safety of both equipment and personnel.

Title 49 CFR includes detailed requirements for the design, construction, and testing of pressure vessels, which encompass the cylinders used for storing and transporting LPG. Compliance with these regulations is essential for the reliability and safety of cylinders, avoiding issues such as leaks or ruptures that could arise from inadequate design or material deficiencies.

The other titles you mentioned do cover important safety regulations in their respective areas: Title 50 CFR primarily deals with environmental protection, Title 30 CFR focuses on mining safety regulations, and Title 29 CFR addresses occupational health and safety. However, none of these titles specifically outline the regulations pertaining to the design and service pressure of cylinders used for transporting liquefied petroleum gases, which is why Title 49 CFR is the correct reference for this question.