Wall Thickness Design
Wall Thickness Design
(OP)
I am doing wall thickness calculation for subsea pipeline based on DNV-F-101 spreadsheet. In the spreadsheet, I am stuck as I don't know the values that I should fill for the following parameters:
M F =Static moment due to curvature in the pipe
S F =Static effective axial force
M E =Environmental moment from vessel motions and hydro dynamic forces
S E = Environmental effective axial from vessel motions and hydro dynamic forces
εF & εE = functional and environmental strain respectively.
I have seen a reference document for 6" and P= 861 PSI pipeline, in that spread-sheet following values have been filled:
M F =empty
S F =empty
M E =54.32 (based on experiment it is 0.85 SMYS)
S E = 170(based on experiment it is 0.10 SMYS)
εF & εE = 0 & 0.15
Can anyone explain it to me how can I find out these values for 8" pipeline and design Pressure = 1600 PSI and temp = 77 deg C.? Any help would be greatly appreciated.
Thanks.
M F =Static moment due to curvature in the pipe
S F =Static effective axial force
M E =Environmental moment from vessel motions and hydro dynamic forces
S E = Environmental effective axial from vessel motions and hydro dynamic forces
εF & εE = functional and environmental strain respectively.
I have seen a reference document for 6" and P= 861 PSI pipeline, in that spread-sheet following values have been filled:
M F =empty
S F =empty
M E =54.32 (based on experiment it is 0.85 SMYS)
S E = 170(based on experiment it is 0.10 SMYS)
εF & εE = 0 & 0.15
Can anyone explain it to me how can I find out these values for 8" pipeline and design Pressure = 1600 PSI and temp = 77 deg C.? Any help would be greatly appreciated.
Thanks.





RE: Wall Thickness Design
1) Pressure containment (buresting)
2) Local buckling - external over pressure only (system collapse)
3) Propagation buckling
In general local buckling - combined loading criteria should be checked in other assessments (i.e. free spans, upheaval/lateral buckling, installation)
What you have pointed out are functional and environmental loads required only for local buckling-combined loading criteria, and their value shall be calculated via either a FEM or manually.
Sincerely,
Amir Naghashan
RE: Wall Thickness Design
Not trying to be negative but if you are trying to use a "spreadsheet" or any other form of calculation/software then you should have a grasp of the Codal requirements and the software/spreadsheet before tackling. Just filling in numbers is not the corrct approach. I suggest you refer to someone with more competency in the type of calculation you are attempting to undertake.
RE: Wall Thickness Design