Which is better, above ground LPG tank or underground LPG tank?

Which is better, above ground LPG tank or underground LPG tank?
We all know that there are two types of lpg tanks: above-ground LPG tanks and underground LPG tanks, so which one should we choose?
 1. Land use
Nowadays, the price of land is soaring, it can be said that an inch of land is an inch of gold. According to the regulations of the "Code for Design of Urban Gas", if one meets the two requirements: the volume of a single storage tank does not exceed 50 cubic meters, and the total capacity does not exceed 400 cubic meters, LPG buried tanks The distance from the wall can be reduced by half compared to the ground tank, and many other safety distances can also be reduced. Therefore, if your total capacity is less than 400 cubic meters, choosing LPG buried tanks can save land area. For example, if you also build two liquefied gas stations of 50 cubic meters and one 20 cubic meters, with a total capacity of 120 cubic meters, if it is For above-ground tanks, about 5 acres of land are needed, but if LPG tanks are buried in the ground, only more than 3 acres of land is needed.
 2. Cost
The underground LPG tank has one more DN450 manhole than the ground tank in structural design, so the price of the pure storage tank will also be more expensive than the LPG ground tank; in addition, the LPG underground tank is buried underground, in order to avoid The surface of the tank body is corroded by the soil, and each storage tank must be treated with anti-corrosion, and the foundation of the storage tank must be underground about 4 meters above the ground. The surface of the buried tank should be filled with sand with a thickness of at least 400 mm. The installation operation is also more complicated than the above-ground tank, the workload is larger, and the installation cost will also increase. Therefore, if your land is relatively spacious, the amount of work to choose above-ground tanks will be much smaller.
 3. Safety
 Most users are more concerned about this issue. Which one is safer, LPG above ground tank or liquefied gas buried tank? Because the design and installation of the liquefied gas station have been reviewed and supervised by the special inspection institute, fire protection, environmental protection, meteorology, technical supervision bureau and other departments, the illegal construction projects will not pass. After the entire pipeline is installed, air tightness test and non-destructive testing will be done. Other monitoring equipment such as liquefied gas concentration alarm and emergency cut-off system must also be installed in the gas station. Therefore, as long as the user operates and operates according to the regulations, there is no big difference in safety, and it is relatively safe.