What is the smallest amount of time that an acetylene cylinder can be emptied?

What is the smallest amount of time that an acetylene cylinder can be emptied?

• A. 5 hours
• B. 7 hours
• C. 9 hours
• D. 12 hours

Answer: (B)

Gas cylinders contain a fixed amount of gas, so how long it lasts depends on how quickly you draw gas out through the regulator. For acetylene, there’s a practical maximum continuous withdrawal rate set by safety and regulator design. Using typical values—about 125 cubic feet of acetylene in a full cylinder and a safe maximum withdrawal rate around 18 cubic feet per hour—the math gives roughly seven hours to exhaust the gas. That’s why seven hours is the smallest practical time to empty a full acetylene cylinder under normal, safe usage. If you used a faster rate, you’d exceed safe operating limits; slower rates would extend the time to about nine or twelve hours, or more.

Gas cylinders contain a fixed amount of gas, so how long it lasts depends on how quickly you draw gas out through the regulator. For acetylene, there’s a practical maximum continuous withdrawal rate set by safety and regulator design. Using typical values—about 125 cubic feet of acetylene in a full cylinder and a safe maximum withdrawal rate around 18 cubic feet per hour—the math gives roughly seven hours to exhaust the gas. That’s why seven hours is the smallest practical time to empty a full acetylene cylinder under normal, safe usage. If you used a faster rate, you’d exceed safe operating limits; slower rates would extend the time to about nine or twelve hours, or more.