However, safe as this gas is, there are still ways of misusing it. Overfilling remains one of the most common culprits, even though the increasing use of Overfill Prevention Devices is reducing this trend. There are still plenty of non-OPD tanks in the field, and as OPD tanks become the rule rather than the exception, the chance of overfilling a conventional tank due to operator inattention decreases considerably.

By design, approximately 20% of the interior space in all propane tanks, OPD and otherwise, is reserved for expansion to safely accommodate the 1.5% increase in volume that propane experiences for every 10 degree Fahrenheit temperature increases. In an overfilled tank, insufficient space may remain as the propane warms up, expelling gas and/or liquid forcefully through the safety relief valve.

Because this venting is unpredictable and could occur in hazardous location, it is essential that the tank be refilled properly. Many portable tanks are equipped with fixed level gauges that can be used to determine safe fill levels. However, weighing the tank is still the most accurate method, eliminating any chance of error that might be caused by replacing the original fixed level gauge with one designed for a different tank size or shape. Note that the float-type gauges normally used for determining the amount of propane in the tank are neither reliable nor accurate enough to be used for determining safe fill levels.

Also, bear in mind that the OPD is intended to provide supplemental protection against tank overfilling, not to serve as the sole means of overfill prevention. The presence of an OPD doesn’t relieve the refiller from the duty of determining the tank’s proper fill volume, either by weight or by using the fixed level gauge.

The next most common hazard is caused by storing, transporting or repairing propane tanks in enclosed areas. In addition to living areas, this also includes enclosed garages, storage sheds and passenger vehicles.

There are plenty of other propane safety tips, ranging from the subtle to the obvious:

Always store and transport unused tanks with the service valve closed and plugged.

Regularly inspect “pigtails” and other flexible hoses for signs of cracks or abrasion. Replace them before they become old enough to develop leaks.

Never use a flame to check for propane leaks. Approved leak detectors are available; in a pinch, soapy water can be substituted.

Never use pliers or a wrench to close the service valve or fixed level gauge. If hand tightening or a screwdriver won’t suffice, repair is in order.

Make certain that tanks are secured in place before any trip, and only transport or operate them in their intended positions. Never lay an upright cylinder on its side because it could expose the safety relief valve to liquid propane.

When first using a refilled tank, slowly open the valve all the way, listening to the regulator. A continuous hiss may indicate a leak somewhere in the system.

Many propane regulators have a “right side up” orientation that must be observed to prevent malfunctions, which could result in dangerously high or low pressures being delivered to appliances.

RV propane tanks should be located in unlocked compartments, except in situations where contact with children is likely. During an emergency, this allows anyone to quickly shut off the propane, even if the RV’s owner isn’t present.

Because propane is heavier than air, any propane alarm should be installed near the floor. This helps minimize its response time.

To reduce the chance of accidentally opening the service valve before removing a POL fitting , it is common practice to leave the valve a small fraction of a turn short of fully open whenever the tank is in use. This removes any doubt as to whether the valve is fully open or closed, requiring several complete turns to close it.

Always shut off the propane before driving through tunnels, before moving the RV indoors for service or storage, or before transporting it in an enclosed ferry compartment.

When refilling tanks installed in vehicles, a temporary ground clip should be connected to the tank for the duration of the filling process, to eliminate sparks caused by static electricity.

Never use a cylinder if it shows signs of dents, gouges, bulges, fire damage, corrosion, leakage, excessive rust or other forms of external damage.

If you smell propane gas, follow these emergency steps:

Put out smoking materials and other open flames.

Don’t operate electric switches, light matches or use a phone. Any spark or flame in the area could ignite the gas.

Immediately get everyone out of the RV, vehicle or other enclosed area.

Close all gas tank or cylinder supply valves.

Do not re-enter the area. Use a neighbor’s telephone to call a trained propane service person and/or the fire department.

Let the service person or firefighters check for propane gas leaks. Have them air out the area before you return.

Have properly trained propane service people repair any leak, then check and relight pilot lights for you.