Construction Safety Advisory

Hoisting Propane Cylinders

 

Case History

Two 100-pound propane cylinders were to be hoisted from the ground to the roof of a multi-storey apartment building. The cylinders were laid horizontally on a hoisting platform that had a barrier edge around its perimeter.

As the platform with the two cylinders was being hoisted, a loose tagline attached to the base got tangled and caught, causing the platform to tip. The cylinders rolled to the edge, the perimeter barrier couldn't stop them, and they fell about 100 feet to the ground.

One of the cylinders split open on impact, releasing a cloud of propane that was ignited by a nearby electrical transformer. An explosion and fire resulted. The second cylinder was engulfed in the fire and exploded shortly afterwards.

Although no one was injured or killed, there was extensive damage to property caused by the explosions and ensuing 150-foot fireball.

Code and Regulation

CSA B149.2-00 ­ The Propane Storage and Handling Code

• Section 5.1.7 ­ "The relief valve shall have direct communication at all times with the vapour space of the cylinder."
• Section 5.6.5 ­ "Any cylinder being transported shall be secured to prevent damage. It shall be transported in a position so that the cylinder relief valve is in direct communication with the vapour space of the cylinder at all times."

Construction Regulation (Ontario Regulation 213/91)

• Section 122 (2) ­ "No cylinder of compressed gas used in welding and cutting shall be dropped, hoisted by sling or magnets or transported or stored in a horizontal position."
• Section 42 (1) ­ "A storage cylinder for compressed gas shall be secured in an upright position."

Recommendations When hoisting propane cylinders, always use a sturdy cradle or basket that allows the cylinders to be secured and maintained in an upright position. The hoisting platform must be designed so that each cylinder being hoisted can be adequately secured to it in an upright position. The platform must also be designed to safely support the greatest possible load to which it may be subjected.

Construction Safety Association of Ontario

21 Voyager Court South, Etobicoke, Ontario M9W 5M7

Tel: (416) 674-2726

Fax: (416) 674-8866

1-800-781-2726

www.csao.org

info@csao.org