LPG and Its Storage Tanks

LPG AND ITS STORAGE TANKS

Liquefied Petroleum Gases (LPG) is a flammable mixture of hydrocarbon gases which is produced through two processes, natural gas processing and petroleum refining processes. It’s a gas at standard temperature and pressure but compressible to a transportable liquid. Commonly used as a fuel for engines, oxy-gas torches, stoves, residential uses, etc. Some hydrocarbons found in LPG include propane, butane and others. Generally stored and transported in steel cylinders as a liquid with a vapor space above the liquid.

Commercially available propane fuel (LPG) is not pure because, the exact proportion of this combination varies by country, depending on international prices, availability of components and especially, on the climatic conditions that favor LPG with higher butane content in warmer regions and propane in cold areas. In Mexico, for example, gas labeled “LPG” may consist of 60% propane and 40% butane. Typically in the United States and Canada, it is primarily propane (at least 90%) with the rest being other gases.

USES

Has several uses in various sectors including domestic fuel, industrial fuel, refrigeration, auto-gas and improvised explosive devices. That is; locomotives, buses, forklifts, ice resurfacing machines, heating and cooking recreational vehicles, electrical generation, blow-torches for soldering or brazing, etc.

    • LPG is highly combustible and has other characteristics that make it hazardous to handle.
    • LPG will spread readily at ground level, and may infiltrate, for example, sewage or water systems in urban areas, generating a risk of wide‐scale explosion
    • Components of LPG such as butanes and isobutanes may also be used as a blendstock for gasoline to improve fuel combustion performance
    • LPG is loaded into pressurized bottles or canisters it can be readily transported and used with little further need for infrastructure.
    • Transport refilled and empty cylinders
    • LPG is a clean and an efficient fuel, with a relatively low carbon footprint and contains few or no contaminants

BULK STORAGE TANKS
(SPHERICAL & BULLET MOULD TANKS)

LPG are be stored in pressure vessels and these containers are either cylindrical, horizontal or spherical. They are designed and manufactured according to some global codes or standards, example is the American Society of Mechanical Engineers (ASME)
These vessels are fitted with pressure relief valves, such that when subjected to exterior heating sources, they will vent LPGs to the atmosphere or a flare stack. In general, tanks are designed so that the product will vent faster than pressure can build to dangerous levels.