Application of pressurized metal tanks:
Metal pressure tanks are widely used in many industries. Among the most used cases, the following can be mentioned. These include distillation towers, submarines, reactors, autoclaves, oil refineries, etc., and also metal pressure tanks. To store liquefied gases such as ammonia, chlorine, propane, butane and LPG can be mentioned.
Design and construction of metal tanks under pressure:
Metal pressure tanks can be made in any way, but the most common shapes are spherical, conical, and cylindrical tanks, and in the meantime, cylindrical pressure tanks are used more in the industry, and in these types of tanks, tanks It consists of a cylindrical shell and two lenses that are installed at both ends of the shell.
Such tanks can be designed and produced based on different standards, but the most common standard in our country is the ASME Boiler and Pressure Vessel Code, or BPVC for short, and the ASME BPVC Section standard for metal pressure vessels. Vlll is used.
The method of making metal tanks under pressure
According to the ASMEVIII (Division 1) standard, the methods of manufacturing metal pressure tanks are classified into the following three categories, which we will briefly explain some of them.
welding
forging
Hard soldering
Welding method in the construction of metal tanks under pressure
In the construction of metal tanks under pressure by welding, there are several methods according to the base metal material, the type of use, the level of sensitivity in the construction of the tank and workshop equipment.
can be used Among them, we can refer to manual electrode welding, MIG welding, sub-powder welding and TIG welding. In this method, after rolling the body of the tank and making its cap, they are welded together.
Forging method in the construction of metal tanks under pressure
The construction of pressure metal tanks by forging method will be applicable for tanks that are in
They do not have longitudinal welds. Also, this method is applicable in low-carbon steels and low-alloy steels.
Materials used to make tanks
In theory, any material with high tensile stress tolerance and suitable tensile properties can be used in the construction of tanks, but ASME BPVC SECTION II manufacturing standards have specified a list of the best materials and their temperature and pressure limits.
Many pressure sources are made of iron, rolled iron sheets that are welded to the lenses and to each other. But this welding may have a negative effect on many properties of rolled iron unless attention is paid before welding.
In addition to proper mechanical strength, the current standards of the world oblige companies to use iron with high impact resistance, and also for environments and fluids that cause corrosion of carbon steel, it is necessary to use materials with the ability Corrosion resistance used.
Some sources under pressure are made of composites, such as carbon fibers, due to the high strength of carbon fiber against tension, these types of metal pressure tanks can be very light, but their construction was very, very difficult.
Metal pressure vessels can be protected with polymers or ceramics to prevent damage, in addition, this coating itself can withstand a large amount of pressure and is a good support for the main layer.
