Incidental Storage of Used Oil in Alberta
Vehicle and heavy equipment service shops and processing plants often have used lubricating oil as a by-product of their business. Environmental impairment and the risk of fire have heightened the awareness of used oil storage in recent years. The Alberta Fire Code sets the standards for installation, operation and removal of storage tanks and related piping. The Fire Code mandates that used oil be stored in conformance with the requirements for combustible liquids. Storage tanks for used oil can be located underground, aboveground or inside buildings.
If a new tank is to be installed underground it must be double-walled and meet a ULC Standard. Underground piping must also be double-walled. The valve where product is removed from must be equipped with a liquid-tight containment box and a suction tube that extends to near the bottom of the tank. The product removal company is required to hook up their suction system to a camlock fitting on the tank pipe. This requirement prevents a stinger from being dropped to the bottom of the tank which may result in tank-bottom damage or product spillage around the pump-out valve. Underground systems must have some way of detecting a leak from underground storage tanks and piping. The customary method of achieving monthly monitoring is by use of observation or monitoring wells strategically located around the tanks. If used oil is piped underground to the tank, the well(s) can be located in the pipe trench. Depending on the porosity of the native soil, a very short pipe run may be monitored by way of a single well located close to the tank between the tank and the wall of the building. Whenever monitoring wells are used for detecting leaks the fugitive product or its vapors must be able to travel to the collection point at the bottom of the well.
Aboveground Storage of Used Oil
The environmental risk of storing petroleum products below ground has resulted in a trend to the use of aboveground systems. The Fire Code requires that all aboveground tanks have secondary containment. There are two styles of secondary containment. The conventional form of secondary containment utilizes a single-walled tank placed inside of a barrier of sufficient height to contain the spill. An impermeable liner is often used on the floor of the dike. New installations typically employ a contained tank assembly where the secondary containment is attached to the primary storage tank. Small used oil tanks can be located very close to a building (0.5 meters if less than 5,000 liters capacity and zero if tank capacity is less than 2,500 liters). If oil is 'pushed' from inside a shop to an outside aboveground tank, an overfill prevention device or warning system should be installed to prevent the tank from being overfilled. As with underground tanks, all aboveground used oil tanks must have a suction tube for removing product.
Used oil tanks may be installed indoors as long as there is adequate drainage control which would prevent spills from reaching a sewer system and not create a fire hazard. As with all tank applications, the tank must be constructed to an appropriate ULC standard. The tank must be vented to the outside and be equipped with proper emergency venting.
Approvals are Necessary Prior to the Installation
Every storage tank installation requires pre-approval from the Authority Having Jurisdiction. Please refer to the PTMAA website to determine the Authority Having Jurisdiction for your area or call the PTMAA office for more information. The AFC mandates that a professional engineer design all aboveground tank installations. As an Authority Having Jurisdiction, the PTMAA requires a completed permit application and three sets of engineered drawings stamped by a professional engineer licensed to practice in Alberta be submitted to our office. A Fire Code Variance to not have an engineer prepare drawings is available. To qualify for the Variance:
- individual tanks are not greater than 8,000 liters,
- the total storage capacity of the installation does not exceed 20,000 liters,
- the tank(s) are outdoors,
- all parts of the tank system are aboveground and visible to inspection, and
- a Small Tank Application is submitted.