We have one LNG line which we are analysing at -196 Deg design/ -158 Deg Operating and +38 Deg cases. We have applied bowing of 50 Deg . The queries are as under-
1. Whether CAESARII will apply bowing to all three cases ? i.e. the stresses due to bowing will be calculated for all 3 temperatures ?
2. What we find that in EXP case for 38 Deg C the stresses are more than those in -195 Deg temp case . Is this due to bowing ? Even if it is due to bowing , logically , we feel that the stresses in -195 Deg C case should be more than stresses in 38 Deg C case.
3. How bowing stresses are handled ? - Whether CAESARII calculates stresses due to "E*co-eff of thermal expansion*bow temperature" and adds it to stresses due to piping ? Any effect of ratio of liquid level and dia of pipe is taken ? When in a big bore line where piping stresses are already high , even if we model a "TEE sif" without modeling connected piping we find that the line gets overstressed since the stresses are already very high.
Regards,
Godbole