76，advantages of bimetallic full capacity tank ceiling structure - doer equipment
classification：forum publishtime：2019-09-17 14:26:21
advantages of bimetallic full capacity tank ceiling structure
the design calculation of the inner tank body of the full capacity tank is calculated according to the relevant chapters of api620-2014. the inner tank barrel is used to contain lng liquid, the inner tank bottom plate is composed of bow ring plate and middle plate, and the inner tank hanging plate is used to support the cold insulation material of the ceiling. four pressure balancing holes are set on the ceiling deck to balance the gas phase pressure of internal and external tanks. the bottom plate of the outer tank is composed of an arched ring plate and a middle plate, and the top of the outer tank is a spherical vault.
① the full capacity tank structure ensures that in case of leakage of the inner tank, the thermal angle protection system of the outer tank can effectively store some lng liquid, and the evaporated gas is discharged through the vent pipeline.
② the full capacity tank structure has the minimum fire separation and high land utilization rate according to the specification requirements.
③ the internal positive pressure and interlayer vacuum load need not be considered in the design of the inner tank. in case of overpressure or vacuum accident, the inner tank will not be affected, and the safety is higher.
④ the pipe compensation in the interlayer does not need to be considered for the connection of ceiling structure. for the inner tank with dome structure, both ends of the pipeline are fixedly connected with the inner tank and the outer tank respectively, while for the suspended ceiling tank, only one end of the pipeline is fixed on the top of the outer tank, and the other end can expand and contract freely.
⑤ the interlayer of the storage tank stores lng evaporated gas without interlayer nitrogen sealing system, which can save supporting valves and daily operation costs, and the operation and control system is simpler.
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