I would also have to consider the ORIENTATION of the piggybacked line coupled with the equivalent diameter (the sum of the large diameter pipeline, small diameter pipeline and gap between the pipelines)in determining the hydrodynamic forces due to waves and currents
Hello,
I am thinking of the best approach on carrying out on-bottom stability of a 4-inch gas lift line being piggybacked by a 12-inch main pipeline:
-Analyzing just the stability of the 12-inch main line (ignoring the piggybacked line) or
- calculating the equv. WT of both lines , then using...
Hello,
I am thinking of the best approach on carrying out on-bottom stability of a 4-inch gas lift line being piggybacked by a 12-inch main pipeline:
-Analyzing just the stability of the 12-inch main line (ignoring the piggybacked line) or
- calculating the equv. WT of both lines , then using...
Hello Everyone,
I have not actually gotten my hands on the latest API 5L Specification for Line Pipe, 5th Edition and was wondering if anyone has done a detailed comparison between these two revisions (44th and 45th). Please it will be so much appreciated.
Hello,
I am currently making some sensitivity runs on-bottom stability using AGA level 2 for a subsea pipeline , at 20 meter water depth.
However , I am getting a strange result which I can’t explain:
Taking a typical Case;
Current dominant case, with Spectral Peak Period (Tp) = 13.6s...
Hello,
I am currently making some sensitivity runs on-bottom stability using AGA level 2 for a subsea pipeline , at 20 meter water depth.
However , I am getting a strange result which I can’t explain:
Taking a typical Case;
Current dominant case, with Spectral Peak Period (Tp) = 13.6s...
I am carrying our a shore approach design for a 20in gas line. The pipeline will be trenched and backfilled (1 m cover) with sand.
Please I am looking for calculation methods/go-by for assessing the stability of the pipeline/backfill against hydrodynamic forces.
I have just calculated axial friction factor of a pipeline laid on a soft clay based on three parameters; breakout friction, residual friction and remolded friction...Residual friction gave me lowest value while breakout gave me the highest value (Ref OTC 19589 PSI during lateral Buckling and...
Oh yes I have gotten the pressure and temp profile (operating case) ...so I have gotten the temp decay from the inlet to outlet. so am okay using this information.
Also during the hydrotest, how do I get the temp profile because I wasn't given this data by my process team (using PIPEPHASE)? So...
Hi
I am currently working on thermal expansion analysis based on Palmer and Ling theory
for a 75km offshore pipeline.
I want to know if its the DESIGN OR OPERATING TEMPERATURE PROFILE I should use for
my calculations, because my PROCESS team supplied me with just the operation temp profile...
Hi IRstuff
I have tried the "If" Statement but it get a scalar instead of a vector.
Please see the worksheet (page 7) for more clarity http://files.engineering.com/getfile.aspx?folder=969daace-5f83-4f9d-861d-cad27f1bbc33&file=joint_strength.mcd
Hi excognito
Thanks, that was very helpful.
Meanwhile, I have a vector Qf with some values greater than 1 .
How do i write a command to make Qf maximum as 1.
Please see attachedhttp://files.engineering.com/getfile.aspx?folder=59051ed2-95ba-4309-8484-c2ce56da161d&file=Image_2.jpg
I need help writing the statement below on mathCAD
C1= 0.2 when beta is less than or equal to 0.9
C1= -0.2 when beta is equal to 1.0
linearly interpolating values between b=0.9 and b=1.0
( please refer to the attached for further clarification)
Thanks
I will be going for a site visit of an existing offshore platform which is to be linked to another platform (proposed) via a bridge connection.
Please does anyone have a typical verification checklist from a structural point of view?
I will be going for a site visit of an existing offshore platform which is to be linked to another platform (proposed) via a bridge connection.
Please does anyone have a typical verification checklist from a structural point of view?
