A UST referred to as an Underground Storage Tank System is a storage system in which a tank and any underground piping is connected to the tank that has minimum 10 percent of its combined volume underground.
Until the mid-1980s, most of the USTs were made of bare steel, which corroded over time, resulting in the leakage of UST contents into the environment. A leaking underground storage system is really dangerous and can affect health and environment negatively, including the potential for fire and explosion.
Leak prevention is achieved by ensuring that underground petroleum storage systems have been adequately designed, installed, operated and maintained which is particularly important for installations located in sensitive environments, such as places in which loss of containment can result in serious environmental damage.
It is a must for the Owners and operators of UPSSs to ensure that all new UPSSs are designed to mitigate risk and effectively contain products such that they do not pose an environmental hazard.
The UPSS designer should certify the following points:
They are suitably qualified and experienced in UPSS design
The UPSS design conforms with the equipment selection measures of section and the design complies with the specific requirements of the Dangerous Goods (Storage and Handling) Regulations 2012, including provision of stable foundations and support, and protection against corrosion and stress.
UPSS equipment selection
Another important point to be taken into consideration is the UPSS equipment selection. Practicable measures for pollution prevention are used that include secondary containment of both tanks and piping, as well as the implementation and maintenance of a leak detection system. Not only thus, as per the standards and guidance Groundwater monitoring bores also need to be installed at sensitive sites.
Next important factor is the correct installation which helps maintain the integrity of new systems.
There are various points that needs to be complied with are :
• the requirements of the UPSS designer • the equipment manufacturer’s instructions
• the specifications contained in AS1940–1993, The Storage and Handling of Flammable Combustible Liquids, Standards Association of Australia
• the methods and specifications contained in RP001, Recommended practices for installation of underground liquid storage systems, PICA, where relevant.
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