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  A pressure vessel or tank is a closed container designed to hold gases or liquids at a high pressure substantially different from the ambient pressure. Pressure vessels can tolerate pressures above 15 psi. They are designed to hold liquids, gasses and sometimes solids. Many types of pressure vessels are used, and some examples are tankers with hazardous materials and airplanes. Pressure Vessels and tanks are very useful and necessary in a great number of applications and situations. If not handled and maintained properly, pressure vessels can present a number of dangers Most pressure vessels are cylindrical, but they can come in a variety of shapes with open or closed ends. Nitrous oxide, liquid nitrogen or other gasses are usually carried in closed-end vessels. In industrial kitchens or factories, open-ended vessels are typically used. They act, essentially, as pipes that connect two high-pressure areas together. These types of pressure vessels are capable of holding significant pressure moving through them. For additional protection, they typically have reinforced sides. Pressure vessels come in many different shapes and sizes for varying uses. Producers commonly use pressure vessels to move, distribute and transfer potentially harmful gasses such as oxygen. Also, these vessels are used in manufacturing plants to transport and carry flammable liquids, such as gasoline. Another type and use of a pressure vessel is a fire extinguisher. The dangers of pressure vessels are possible when the vessel has a leak or crack. This can lead to an explosion if the crack is big enough for the pressure of the air to weaken the sides of the container. In this situation an accident or large bump can cause the hazardous contents to explode and even start a fire. Also, a leak allows poisonous gas to escape unknowingly causing people to suffocate. Only trained professionals who work with them

A pressure vessel is a closed container or storage tank that is designed to hold materials such as gasses or liquids at high pressures. Some types of pressure vessels include compressed gas storage tanks (air, oxygen, nitrogen tanks, etc.), anhydrous ammonia tanks, hydro pneumatic tanks, autoclaves, hot water storage tanks, chemical reactors and refrigerant vessels. They are designed for operating pressures above 15 pound-force per square inch gauge (psig) and a volume greater than 5 cubic feet or 1 ½ cubic feet in volume with a pressure exceeding 600 psig. The pressure of the contained material is substantially different from the pressure of the surrounding environment, or ambient pressure. The pressure differential presents dangerous circumstances and safety hazards; therefore the need for proper handling is crucial. Care and caution are required to avoid serious safety issues, fatal accidents have occurred in the past during vessel development and operation. Due to the dangerous nature of pressure vessels, legislation has appointed engineering authorities to regulate the pressure vessel design, manufacture, handling and operation. Pressure vessels must be installed, operated and maintained in accordance with standards and codes of the industry. Compliance is absolutely imperative in order to protect the safety and health of workers. Pressure vessels must pass a multitude of inspections. If a pressure vessel is cracked or damaged it creates number of health and safety hazards. When pressure vessels fail, it is usually catastrophic, releasing large amounts of energy and contents. Some possible reactions are high-speed projectiles or a shock wave of the vessel contents. Suffocations, poisonings, fires and explosions are also possible. These situations can have devastating consequences and the potential dangers are extensive. Inspections help prevent such accidents from happening, but proper maintenance between inspections is equally as important. Proper knowledge of local and federal mandates for pressure vessels is