Storage tanks are containers that hold liquids, compressed gases gas tank; or in U. A "pressure vessel", which is not typically labeled or regulated as a storage tank or mediums used for the short- or long-term storage of heat or cold.
The usage of the word tank for reservoirs is uncommon in American English but is moderately common in British English. In other countries, the term tends to refer only to artificial containers. In the USA, storage tanks operate under no or very little pressure, distinguishing them from pressure vessels. Storage tanks are often cylindrical in shape, perpendicular to the ground with flat bottoms, and a fixed flangible or floating roof.
There are usually many environmental regulations applied to the design and operation of storage tanks, often depending on the nature of the fluid contained within. Above-ground storage tanks ASTs differ from underground storage tanks USTs in the kinds of regulations that are applied.
Above ground storage tanks can be used to hold materials such as petroleum, waste matter, water, chemicals, and other hazardous materials, all while meeting strict industry standards and regulations. Reservoirs can be covered, in which case they may be called covered or underground storage tanks or reservoirs.
Covered water tanks are common in urban areas. Storage tanks are available in many shapes: vertical and horizontal cylindrical; open top and closed top; flat bottom, cone bottom, slope bottom and dish bottom. Large tanks tend to be vertical cylindrical, or to have rounded corners transition from vertical side wall to bottom profile, to easier withstand hydraulic hydrostatically induced pressure of contained liquid.
Most container tanks for handling liquids during transportation are designed to handle varying degrees of pressure. A large storage tank is sometimes mounted on a lorry truck or on an articulated lorry trailer, which is then called a tanker. In the U. Quantification of potential emissions for permitting purposes is most often accomplished by applying emission equations published in Chapter 7.
Above Ground Storage Tanks
Since most liquids can spill, evaporate, or seep through even the smallest opening, special consideration must be made for their safe and secure handling. This usually involves building a bunding , or containment dike, around the tank, so that any leakage may be safely contained.
Some storage tanks need a floating roof in addition to or in lieu of the fixed roof and structure. This floating roof rises and falls with the liquid level inside the tank, thereby decreasing the vapor space above the liquid level.
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Floating roofs are considered a safety requirement as well as a pollution prevention measure for many industries including petroleum refining. In the United States, metal tanks in contact with soil and containing petroleum products must be protected from corrosion to prevent escape of the product into the environment. Outside the United States and at some locations in the United States, elevated tank support foundations with a sand bitumen mix finish are often used.
Above Ground Fuel Storage Tanks
These type of foundations keep the tank bottom plates free from water, hence prevent corrosion. Tanks for a particular fluid are chosen according to the flash-point of that substance. Generally in refineries and especially for liquid fuels, there are fixed roof tanks, and floating roof tanks. IFR tanks are used for liquids with low flash-points e.
These tanks are nothing but cone roof tanks with a floating roof inside which travels up and down along with the liquid level. This floating roof traps the vapor from low flash-point fuels. Floating roofs are supported with legs or cables on which they rest. FR tanks do not have a fixed roof it is open in the top and has a floating roof only. Medium flash point liquids such as naphtha, kerosene, diesel, and crude oil are stored in these tanks.
One of the common types found in mining areas is the open roof type tank, usually to store ore slurries. These are the easiest storage tanks to build. Other classifications which can be made for storage tanks are based upon their location in a refinery:. As flash-points of fuels go very low the tanks are usually spherical known as spheres , to store LPG, hydrogen, hexane, nitrogen, oxygen etc.
An atmospheric tank is a container for holding a liquid at atmospheric pressure. API is used for analysis of in-service storage tanks.
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In the case of a liquefied gas such as hydrogen or chlorine , or a compressed gas such as compressed natural gas or MAPP , the storage tank must be made to withstand the sometimes immense pressures exerted by the contents.
These tanks may be called cylinders and, being pressure vessels , are sometimes excluded from the class of "tanks". One form of seasonal thermal energy storage STES is the use of large surface water tanks that are insulated and then covered with earth berms to enable the year-round of solar-thermal heat that is collected primarily in the summer for all-year heating. The thermal storage medium is gravel and water in large, shallow, lined pits that are covered with insulation, soil and grass.
Ice and slush tanks are used for short-term of cold for use in air conditioning, allowing refrigeration equipment to be run at night when electric power is less expensive, yet provide cooling during hot daytime hours. In dairy farming a bulk milk cooling tank is a large storage tank for cooling and holding milk at a cold temperature until it can be picked up by a milk hauler.
It is usually made of stainless steel and used every day to store the raw milk on the farm in good condition. It must be cleaned after each milk collection.
The milk cooling tank can be the property of the farmer or being rented to the farmer by the dairy plant. A septic tank is part of a small scale sewage treatment system often referred to as a septic system.
Septic systems are commonly used to treat wastewater from homes and small businesses in rural and suburban areas. Waste water enters the tank where solids can settle and scum floats.
Anaerobic digestion occurs on the settled solids, reducing the volume of solids. The water released by the system is normally absorbed by the drain field without needing any further treatment.
While not strictly a "storage" tank, mobile tanks share many of the same features of storage tanks. Also, they must be designed to deal with a heavy sloshing load and the risk of collision or other accident.
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Some of these include ocean-going oil tankers and LNG carriers ; railroad tank cars ; and the road and highway traveling tankers. Also included are the holding tanks which are the tanks that store toilet waste on RVs , boats and aircraft.
While steel and concrete remain one of the most popular choices for tanks, glass-reinforced plastic , thermoplastic and polyethylene tanks are increasing in popularity. They offer lower build costs and greater chemical resistance, especially for storage of speciality chemicals. There have been numerous catastrophic failures of storage tanks, one of the most notorious being that which occurred at Boston Massachusetts USA on January 14, The large tank had only been filled eight times when it failed, and resulting wave of molasses killed 21 people in the vicinity.
The Boston molasses disaster was caused by poor design and construction, with a wall too thin to bear repeated loads from the contents. The tank had not been tested before use by filling with water, and was also poorly riveted. There have been many other accidents caused by tanks since then, often caused by faulty welding or by sub-standard steel.
New inventions have at least fixed some of the more common issues around the tanks' seal. If they have been used to hold oil or oil products such as gasoline , the atmosphere in the tanks may be highly explosive as the space fills with hydrocarbons. If new welding operations are started, then sparks can easily ignite the contents, with disastrous results for the welders.
The problem is similar to that of empty bunkers on tanker ships , which are now required to use an inert gas blanket to prevent explosive atmospheres building up from residues.
The word "tank" originally meant "artificial lake" and came from India, perhaps via Portuguese tanque. It may have some connection with:.
From Wikipedia, the free encyclopedia. This article is about a storage tank. For other uses, see Tank disambiguation. Container for liquids or compressed gas.
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BEGINNERS GUIDE TO ABOVEGROUND TANKS
Oxygen and MAPP gas cylinders. Fuel tanks. Several large tanks at an airport. For scale, note concrete highway barriers. Archived from the original on Retrieved European Sustainable Energy Week, Brussels.
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