english 
Yes, the installation of double - wall fuel tanks has several special requirements. Here are the details:
- Location selection: Double - wall fuel tanks should be installed in a well - ventilated area to prevent the accumulation of fuel - vapor. The site should be flat and solid to ensure the stability of the tank. In addition, it should be away from sources of heat, sparks, and direct sunlight to reduce the risk of fire and explosion. For example, in a gas station, the tank is usually installed in an underground pit with good ventilation to meet safety requirements.
- Foundation construction: A proper foundation is crucial. The foundation needs to be able to bear the weight of the full tank. Usually, a concrete foundation is poured, and its size and strength should be designed according to the size and weight of the fuel tank. The surface of the foundation should be level to ensure close contact with the bottom of the tank to avoid stress concentration.
- Connection and piping: The connections between the double - wall fuel tank and the piping system must be leak - proof. High - quality flange connections or welded connections are often used. Before installation, the piping should be inspected for any damage or blockage. The slope of the piping should be designed appropriately to ensure the smooth flow of fuel and to prevent fuel from remaining in the piping.
- Leak detection system: Double - wall fuel tanks are usually equipped with a leak - detection system. This system should be installed and connected correctly during installation. The sensor of the leak - detection system should be placed in the interstitial space between the two walls of the tank to detect any fuel leakage in a timely manner. Regular testing and calibration of the leak - detection system are also required to ensure its normal operation.
- Safety accessories: Installation of safety accessories such as pressure - relief valves, flame arresters, and level gauges is necessary. These accessories should be installed in accordance with the manufacturer's instructions to ensure the safe operation of the fuel tank. For example, the pressure - relief valve should be set to open at a specific pressure to prevent the tank from being damaged due to excessive pressure