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1994 PipelineSafety Task Force
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1994 PipelineSafety Task Force
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5/9/2014 1:06:07 PM
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There are no "after installation on going" inspections specified in Code 30 or the <br />Uniform Fire Code. <br />Above GroUnd Storage Tanks Come in a Variety of Designs (from Fire Protection <br />Handbook, 19fi9 Edition) <br />♦ Atmospheric - tanks for pressures of 0 to .5 per square inch. <br />♦ Low pressure tanks - pressures .5 to 15 pounds per square inch. <br />♦ Pressure tanks - pressure above 15 pounds per square inch. <br />Pressure type tanks and pressure vessels are used normalfy for vapor conservatio� for <br />liquids having high vapor pressures. <br />Four Different Types of Tanks <br />1. Ordinary cone roof #ank. <br />2. Floating roof tank - roof moves up and down with level changes. <br />3. Lifter roof tank -#iquid sea�ed roof moves up and down with voEume of vapor. <br />4. Vapor roof tank - has a flexible diaphragm at the tank's roof and moves with <br />vapor volume changes. <br />The probability of a fire in an approved tank is much less than a fire in an ordinary <br />building_ Where tanks are adjacent #o a building, the fire in the building exposes the <br />tanks more often than the tanks expose t�e buildings. <br />A major factor in fires involving storage tanks has been either the fatlure of the piping or <br />ti�e valves controlling the tanks (corrosion problems). <br />Floating roof tanks provide maximum fire safety for above ground use; thus they are <br />permitted to be located closer to a property line than other types of tanks. Expfosions <br />can occur when the floa#ing roof tanks are near empty and a flammable vapor is <br />created. <br />Cathodic Protection <br />Cathodic protection, as mandated by federaf regulation, is a method of mitigating <br />external pipeline corrosion which is defined as the eroding of a metal pipe by <br />electrochemical action. When naturalty occurring electricity enters the metal (cathode), <br />metaf will be consumed where a current ieaves the metal (anode). This reaction can be <br />inhibited by electricaify energizing the pipe (cathode) and placing high silicon casi iran <br />or pieces of graphite in remote ground beds (anodes) in electricaf contact with the pipe. <br />Thus, the iron or graphite will be corroded, no# the pipe. Another method is to <br />electricaiiy connect the pipe with a metal higher in the electro-motive force series. The <br />5-5 <br />
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