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86 512-81666096120，20000m ³ bog calculation under leakage condition of lng full capacity tank - doer equipment
classification：forum publishtime：2019-11-18 13:33:42
20000m ³ bog calculation under leakage condition of lng full capacity tank
20000m ³ according to gb / t 26978.1-2011 design and construction of on-site assembled vertical cylindrical flat bottomed steel liquefied natural gas storage tank, the leakage of lng full capacity tank can meet the requirements for tank leakage conditions in the specification only when the cylinder plate at the bottom of the inner tank has a hole with a diameter of 20mm. at the same time, in addition to small leakage conditions, bog calculation under a large number of leakage conditions (i.e. leakage caused by tearing failure of inner tank cylinder under internal and external forces) is additionally calculated.
1、 calculation of bog leakage at 20mm hole
1 calculation basis
gb26978.1-2011 design and construction of field assembled vertical cylindrical flat bottomed steel liquefied natural gas storage tanks
2 calculation process
according to gb / t 26978.1-2011 design and construction of field assembled vertical cylindrical flat bottom steel liquefied natural gas storage tank
section 7.2.2 only considers the bog leakage when the cylinder plate at the bottom of the inner tank has a hole with a diameter of 20mm.
design liquid level h 23m
low temperature lng liquid flow rate at leakage hole:
v= h g 2 = 23 9.81 × 2 =20.39m/s;
low temperature lng liquid flow at leakage hole:
q=v × s=21.3 × π × 0.01 2
=6.41 × 10 -3 m ³/ s
=24.08m ³/ h
where s is the area size of 20mm hole, and the unit is m2
converted to gaseous state, i.e. bog leakage caused by 20mm hole q = 24.08 * 1250 = 30100nm ³/ h
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