Posted by: bag_piper
Thermal bowing phenomenon handling in CAESARII - 06/12/14 10:54 PM
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
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