Free flooding of subsea pipeline
Free flooding of subsea pipeline
(OP)
I have a problem to calculate a free flooding of offshore subsea pipeline. I would like to calculate it with as minimum aproximations as possible.The calculation is not so simple since the pressure in pipeline is changing as the pipeline is filled with water. The concept is to fill the pipeline from one side (deeper side)and to have a check valve at the other side.
Any equation for a start or a spreadsheet?
Thanks in advance,
udaveu
Any equation for a start or a spreadsheet?
Thanks in advance,
udaveu





RE: Free flooding of subsea pipeline
Contents:
What will the pipeline contain at the time it is flooded? Such as natural gas, crude oil, gas and oil?
Internal Pressures:
What will be the pipeline's internal pressure profile at the time the valve opens?
External Pressures:
What is the pipeline's external pressure profile (depths of the pipeline)?
Temperatures:
Internal product temperature profile.
External ocean temperatures profile.
http://virtualpipeline.spaces.msn.com
RE: Free flooding of subsea pipeline
So, at the begining, before opening, pipeline is full of air and closed so we can consider the pressure is 1 barA. The pipeline will be free flooded by opening a 4" ball valve with sea water. Temperature of water will not make a big impact but we can assume its about 20 deg C. The problem is general, but we can also take the depth 100m and lets say 70 m from another side....
RE: Free flooding of subsea pipeline
You didn't mention the profile. I think its possible that an undulating pipeline profile may trap air at local high points. That air might lock at the high points and not free flow to the exit point. Can you assume there is a continuous constant slope from low to high?
http://virtualpipeline.spaces.msn.com
RE: Free flooding of subsea pipeline
Secondly, I agree your point for a profile but we can assume the continious constant slope of pipeline...
RE: Free flooding of subsea pipeline
http://virtualpipeline.spaces.msn.com
RE: Free flooding of subsea pipeline
RE: Free flooding of subsea pipeline
RE: Free flooding of subsea pipeline
http://virtualpipeline.spaces.msn.com