|MadSci Network: Engineering|
Your question was a little puzzling. Are your plans to build storage? Building storage for this material is best left to the experts. As far as concrete, there are many grades. Also, there are numerous techniques in designing storage devices. Hydrogen containment within concrete usually consists of steel walls which you haven't mentioned, nor the tank wall dimension. Under these conditions, it is virtually impossible to provide KiSSGS data. So maybe a little background may help you with specifications on your theoretical tank design and compressor and refrigeration and .... Compressing hydrogen is similar to compressing natural gas, though as hydrogen is less dense the compressors need better seals. Hydrogen is normally compressed to between 200 and 250 bar for storage in cylindrical tanks of up to 50 litres. These tanks may be made from aluminium or carbon/graphite compounds. If the compressed hydrogen is to be used on a larger scale then pressures of 500-600 bar may be employed, though some of the largest compressed hydrogen tanks in the world (about 15,000 cu-m) use pressures of only 12-16 bar. In order to reduce the volume required to store a useful amount of hydrogen, liquefaction may be employed. Since hydrogen does not liquefy until it reaches -253°C (20 degrees above absolute zero), the process is both long and energy intensive. Selection of the proper materials of construction for cryogenic service is one of the most important considerations. Of primary concern is how the material will perform at cryogenic temperatures. Fracture mechanics involving such properties as notch toughness, ductility, critical flaw sizes, specific heat, coefficients of thermal expansion and thermal conductivity at cryogenic temperatures, as well as the usual strength and elastic properties of the material, must be studied. The cryogenic industry recognized the need to study the subject of fracture mechanics as it applies to materials of construction for cryogenic service. CB&I, was one of the principal participants to study the properties of 9 percent nickel. Proper materials and techniques need be selected to meet requirements for cryogenic storage. MATERIALS FOR LOW-TEMPERATURE TANKS (DOWN THROUGH -60F) ALLOWABLE STRESS (PSI) Material.....Pressure Designations.Storage Number.......(ASME) psi(kg/cm2) A516-55.......13,700 (963) A16-60........15,000 (1055) A516-65.......16,250 (1140) A516-70.......17,500 (1230) A537 Grade 1..17,500 (1230) A537 Grade 2..20,000 (1405) A737 Grade B..17,500 (1230) Cryogenic Materials (THROUGH -450°F) Stainless....18,750 Aluminum.....6,250 to 10,000 5%-9%Nickel....23,750
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