About spherical tanks

Bottom inlet pipe, outlet pipe as well, level gauge interface, drain pipe, pressure point, temperature point. Upper vapor phase outlet pipe, vent pipe, safety valve interface, vapor phase end of level gauge, pressure point, temperature point

At the bottom are: the inlet and outlet pipes (for feeding and discharging material), including those for reflux; currently, there is only one pipe for material entry and exit at the bottom of the tank. There is also a water removal pipe (used to remove water and impurities from within the tank). Additionally, there are instrument connections for measuring pressure, temperature, and liquid level. At the top are: an exhaust pipe, a vapor equilibrium pipe (used to balance the pressure across various storage tanks), and safety valve connections (usually two in number); when the pressure in the tank exceeds the set value, the safety valves activate to release pressure back to acceptable levels, after which they reset automatically, thus providing safety protection. There are also instrument connections for pressure, temperature, and liquid level. The tank has manholes both at the top and at the bottom.

There is also a nitrogen line, used to replace the gas inside the tank; it is generally used at the time of initial operation

Generally, the spherical tank should have as few opening nozzles as possible; at the bottom there are lines for material inlet and outlet (one shared line for two-way flow) as well as a water separation line (since water has a higher density than liquid hydrocarbons, it is separated from the bottom of the tank). The instruments located at the bottom typically include on-site thermometers and temperature transmitters； The top of the spherical tank is equipped with a vent port, which is connected to a vent manifold. Two safety valves, a vapor connection line, and a manual vent line are all connected to this vent manifold. The instruments located at the top include on-site pressure gauges, pressure transmitters, and servo level gauges. In addition, there is one manhole at each of the upper and lower levels of the spherical tank (an opening is made in the manhole at the water cut level, positioning it at the lowest point of the spherical tank)

Now, generally, there are tuning fork switches with openings at the top and bottom

Are you working in the oil refining field? I have a question: In a customer’s liquefied petroleum gas storage tank, the outlets of the two safety valves are connected together without any reduction in diameter. Is this in compliance with the standards?

There is usually also a on-site discharge pipeline at the top of the spherical tank. It is also the thinnest one.

The storage tank pipelines for different materials also vary

The outlet pipeline just needs to be thick enough; generally, there is only one vent line.