Which statement is true about the DOT-4BA240 cylinder designation?

• A. The 240 refers to diameter
• B. The 240 refers to service pressure
• C. The 240 refers to length
• D. The 240 refers to color code

Answer: (B)

In this cylinder designation, the number at the end shows the service pressure the cylinder is designed to withstand. The 240 indicates a service pressure of 240 psi. This rating reflects the maximum pressure the cylinder can safely contain during normal use. It is not related to the cylinder’s diameter, its length, or its color code. Temperature affects the actual gas pressure inside a propane cylinder, which is why regulators are used to deliver gas at a safe, usable pressure to appliances.