Uncertainties in the prevention of cryogenic storage overpressure
Large quantities of LNG, LPG, NH3, hydrocarbons etc. (critical temperature below ambient) stored at boiling point/near atmospheric pressure exhibited unpredictably enhanced evaporation/overpressure causing serious incidents. Storage operation models are not fully reliable. Evaporation is liquid mixing patter dependent, and miscalculation may lead to faulty design and operation. Experimental evidence at free convection horizontal boundaries heat transfer is examined under Nusselt-Rayleigh analogy. LNG, exhibits considerable sensitivity areas of applicability of heat transfer coefficients are delineated. Model predictions examined against actual plant data show large discrepancies and evidence for extra safety precautions in vapour withdrawal in relation to the tank design pressure and mixing.
Bibliographic Reference: Paper presented: ESREL 96/PSAM III, Crete (GR) June 24-28, 1996
Availability: Available from (1) as Paper EN 39819 ORA
Record Number: 199611127 / Last updated on: 1996-10-28
Original language: en
Available languages: en