Stationary Seabed Systems

Operational stability (moon pool or center well) 

Elements of an offshore in situ testing system. (After Richards, A.F., and Zuldberg, H.M., In-situ determination of the strength of marine soils. In Strength Testing of Marine Sediments, STP 883, Chaney, R.C., and Demars, K.R., eds., American Society for Testing and Materials, Philadelphia, PA, 11-40, 1985. Reprinted with permission. Copyright ASTM.) 

Typical stationary seabed jacking systems utilizing a stabilized drill string are Stingray and Seacalf. 

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There are two basic types of stationary seabed systems (1) fixed and (2) portable systems as shown in Figure 4.7. The systems shown in the figure have penetration capability ranging from about 10 m in very hard soils to more than 50 m in soft soils. Certain types of stationary systems, usually having a penetration capability of less than 15 m, do not have tensioned cables as shown in Figure 4.7, particularly the cable that supports the upper end of the test rods. In such instances, a column supports the test rods (Beard and Lee, 1982). The seabed jacking machine shown in the figure traditionally provides discontinuous penetration and retraction of the cone, piezocone, or vane sensors that may be attached to the lower end of the test rods. Continuous penetration and retraction machines have recently... 

A typical stationary seabed system utilizing a stabilized drill string is the Wison wire-line cone penetrometer. 

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