Deep Water Single Point Mooring Design
Abstract
This report presents the results of a feasibility study of single point mooring (SPM) systems for the Mobile Offshore Base, a very large semi- submerged platform, in up to 10,000 ft (3000 m) water depth. The MOB will use the mooring in mild environments. Three moorings were investigated; Single Catenary Leg Mooring (SCLM), Multi-Catenary Anchor Leg Mooring (MCALM), and Catenary and Single Anchor Leg Mooring (CASALM). A force-deflection analysis computer program was written to analyze the CASALM and then adapted for the other moorings. Maximum mooring forces were predicted with the MOB in various sea states. The SLCM appears to be the most feasible mooring for the MOB. It can moor the MOB in sea state 3 without thruster assist, it is relatively inexpensive, and it is easy to install. The SCLM may consist of only a short chain attached to the MOB, a polyester rope extending down almost to the sea floor A vertical uplift anchor might be used to further limit the motions of the MOB. This report includes: Derivation of equations; Mooring computer program, description of program, and user's guide; Information on high holding, vertical uplift resisting anchors; and Information on synthetic fiber rope for deep water mooring
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 10, 1997
- Accession Number
- ADA286939
Entities
People
- Henry A. Mckenna
- John F. Flory