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Method of laying offshore pipeline from a reel carrying vessel
| Details |
Inventors: Yenzer, Dennis E.; Cha, John H.; Abramovich, Dan;
Assignee: Santa Fe International Corporation (Orange, CA)
Primary Examiner: Taylor; Dennis L.
Assistant Examiner:
Attorney, Agent or Firm: LeBlanc, Nolan, Shur & Nies
Disclosed are methods and techniques related to the control of pipelaying operations from a self-propelled reel pipelaying vessel. The methods are concerned with (1) controlling pipeline geometry as a function of pipe entry angle into the water and tension on the pipeline; (2) monitoring the excursion of the pipeline outside certain defined limits and controlling the pipeline geometry based on such measured excursions; and (3) compensating for pipeline induced turning moments which would otherwise tend to draw the pipelaying vessel off course and off the predetermined pipeline right of way. |
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DETAILED DESCRIPTION What is claimed is: 1.
A method of laying pipe offshore from a self-propelled reel pipe laying vessel, said vessel having self-propulsion means, a reel for spooling relatively inflexible pipe thereon, pipe handling means for straightening the pipe as it is unspooled and for guiding the straightened pipe into the water at a presettable adjustable pipe exit angle, and means for maintaining the pipe under a predetermined adjustable tension, said method comprising the steps of: setting the pipe handling means to establish a desired pipe exit angle at which the pipeline substantially enters its catenary configuration before exiting the vessel and pipe handling means; and setting the tensioning means to hold the pipe under a predetermined nominal tension in conjunction with the pipe exit angle, to establish a minimum radius of curvature of the pipe in the sag bend region which is greater than the minimum radius to which that pipe may be bent without exceeding its elasticity limits as it is unspooled and paid out from the vessel.
2.
A method according to claim 1, further comprising: setting and maintaining a pipe exit angle and nominal pipeline tension to maintain the allowable working stress in the unsupported length of pipe between the vessel and sea bottom at less than the maximum working stress to which the pipe may be permissibly subjected.
3.
A method according to claim 1, further comprising: setting and maintaining a pipe exit angle and nominal pipeline tension to maintain the allowable working stress in the unsupported length of pipe between the vessel and the sea bottom at not greater than about 85% of the maximum working stress to which the pipe may be permissibly subjected.
4.
A method according to claim 1, 2 or 3, further comprising: setting the tensioning means to hold the pipe under the minimum tension required for a given exit angle to maintain the pipe within maximum allowable pipe stress limits and within maximum allowable residual tension limits for that pipe
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