Oil Storage Tank Regulations Flashcards

What is the maximum amount of oil that can be stored domestically in a single above-ground tank under typical Building Regulations?

Answer: 3,500 litres

Building Regulations typically apply to domestic oil tanks up to 3,500 litres. Tanks above this capacity may require additional permissions and must comply with the Control of Pollution (Oil Storage) Regulations.

What is the purpose of an anti-siphon valve on an oil tank outlet?

Answer: To prevent the oil draining from the tank through gravity if the supply line is broken

An anti-siphon valve (or anti-siphon device) prevents the tank's contents from siphoning out through a broken or disconnected supply line when the tank is positioned above the burner. This prevents environmental contamination and fire risk.

What colour should an oil storage tank ideally be, and why?

Answer: A light colour such as green or grey to reduce solar heat gain

Light-coloured tanks (green, grey, or light stone) reflect sunlight, reducing solar heat gain which can cause thermal expansion and fuel loss through the vent. Dark tanks absorb heat and can cause more rapid fuel degradation.

What is the responsibility of the oil delivery driver regarding overfilling?

Answer: They must monitor the fill process and stop before the tank is overfilled

The delivery driver has a legal duty of care to prevent overfilling. They should check the tank gauge, use the whistle vent or electronic alarm, and remain by the fill point during the entire delivery to stop the pump if needed.

Under the Oil Storage Regulations, what is the trigger point for mandatory secondary containment in domestic properties in England?

Answer: Tanks over 2,500 litres in specified locations, or any tank where there is a pollution risk

In England, domestic oil storage requires secondary containment where the tank is over 2,500 litres or where there is a risk of oil reaching controlled waters. Building Regulations also impose bunding requirements based on location and risk.

How should rainwater be removed from a bunded tank area?

Answer: Manually, after checking it is not contaminated with oil — never through an automatic drain

Rainwater must be manually removed from bunds after checking it is not contaminated with oil. Automatic drains or permanently open valves are not permitted as they would defeat the purpose of the bund if they allowed oil to escape.