Fuel Delivery access
- The area between the delivery tanker and the filling point of the fuel tank must have adequate clearway
- It should be free of all rubbish, obstacles, machinery, junk, etc. within 3m of the legs, so that the driver can safely move between the truck and the ladder to the fill point.
- The area beneath the fuel storage tank is not to be used as a storage area for equipment or obsolete items
Bund heights and tank distance from the bund wall
- Wall-type bunds at tank storage facilities should be from 0.5 m to 1.5 m high, depending on the required containment capacity and the distance to the tank—the closer the wall to the tank, the higher the wall should be.
- The distance between tanks and bund walls should be at least 1 m. If the bund walls are more than 1 m above the compound floor, consider providing steps or ladders for quick escape.
- For bund walls close to tanks or higher than 1.5 m, the rules applicable for confined spaces may apply.
- If vehicles will need access to the bunded area, consider using ramps, a change in grade, or speed humps to maintain an effective bund height.
Net capacity of the bund
- The net capacity of a bunded compound in a storage facility should be at least 120% of the net capacity of the largest tank. Take into consideration the capacity displaced by other tanks within the same bunded area and any foundations.
- Treat interconnected tanks as a single tank of equivalent total volume for the purposes of the bund design criteria. For flammable liquids, bund capacity should be at least 133% of the net capacity of the largest tank.
- If an automatic fire sprinkler system is installed in or over any bunded tank or drum storage compound, the capacity of the bund should be increased either by a volume equal to the output from the sprinkler system for a period of at least 20 minutes, or to 133% of the capacity of the largest tank, whichever is greater.
- Further guidance on the storage of flammable liquids can be obtained from Australian Standard AS1940–2004 The storage and handling of flammable and combustible liquids
Materials used for bunding
- The bund floor and walls should be built of materials impervious to the contents of any tank or container within the bund.
- It should be of sufficient strength and structural integrity to ensure that it is unlikely to burst or leak in ordinary use, and should not have a damp course.
- The use of un-reinforced materials is not recommended for bund wall construction. The bunded area should be capable of preventing the migration of any spillage or leakage to the surrounding environment. Earthen bunds are not recommended, except where there is no other viable alternative.
- A collection sump should be provided in the bund floor to make it easy to remove accumulated liquids, and the floor should be graded in such a way that liquids collect in the sump.
- ·The sump should not be connected to stormwater or sewer drainage systems—it is only a collection point from which to pump out the liquid; there should not be any access to the stormwater system within the bund.
- Bund drain valves should not be installed, and pump controls should be located outside the bunded area.
- Accumulated liquids resulting from spills or vessel ruptures may be able to be collected and reused on site. However where this is not possible or appropriate, the liquid should be collected and disposed of by an authorised liquid waste contractor
- Rainwater will often evaporate from within an open bund, however if there is no rainwater in the bund after heavy rainfall it may indicate that the bund may not be properly sealed and therefore should be inspected and repaired as appropriate.
- Accumulated rainwater may be contaminated and should not be disposed of to the stormwater drainage system.
Signage & Notices
- Fuel delivery drivers must be able to identify the contents of a tank before filling to ensure the correct fuel is pumped into the right tank.
- All fuel storage tanks are to be labelled with the contents of the tank. The product identification should be clearly placed on the tank so as to be easily read from ground level.
- Additional signage required to be displayed shall include a “DANGER – NO SMOKING, NO NAKED FLAMES” sign prominently displayed around fuel dispensing equipment.
- A fuel tank that is storing flammable liquids must also have correct placarding required by State or Territory legislation covering storage and handling of dangerous goods attached to the tank.