These kind of tanks are installed underground. In this case the tanks should tolerate not only weight of inside fluid but the static (Such as soil weight) and dynamic (such as traffic load). There is not a need for pumping for inserting the fluid to inside the tank but for discharging, normally, there is a need to use suitable pump. The power and specification of this pump should calculated so the required amount of fluid can be discharge in a considered period of time.
Just like aboveground PE tanks there is no any limitation on design and construct of inlets, outlets, maintenance entrance and inside divisions of the tank. The calculations for production of these tanks are according to the data such as depth of installation, traffic load amount, compaction of backfilling, ground level water, and soil type of the ground and backfilling which is provided by the customer.
Usually, these tanks install in parking, roads, highways, parks, airports, and industrial factories. So, these tanks do not occupy any place aboveground.
One of the main advantage of the PE tanks is its resistance against acid, bases, and other chemical materials. PE do not have any reaction with most of the chemical materials. So, it’s very useful for storing chemical materials inside the factories.
One another advantage of these tanks is possibility of changing the location tank after installation. By excavating the surrounding area of the tank and discharging the inside liquid, its possible to change the location and send to new location for installation.