Showing papers on "Submarine pipeline published in 1972"

Offshore pipeline recovery

Abstract: An offshore pipeline is recovered from the bottom of a body of water by introducing gas into one end of the line and pumping liquids from the other end of the pipeline until a section of the line at least sufficiently long to reach to the surface of the body of water has been substantially voided of liquids, and thereafter lifting the end of the pipeline to the water''s surface. This procedure substantially reduces the cost of pipeline recovery operations and has other advantages over methods used in the past.

Method and apparatus for supplying temporary buoyancy to an underwater pipeline

Abstract: Temporary buoyancy is supplied to a submarine pipeline by connecting one or more sections of interconnected thin walled pipe members to a submarine pipeline such that a compressed gas may be supplied to the thin walled members enabling the net weight in water of combined pipes to be controlled to approximately zero. The compressed gas is ultimately replaced by water as a result of manipulations performed at the water surface.

Device for surveying the configuration of an immersed pipe during its laying

Abstract: An apparatus for surveying the configuration of a submarine pipeline during its laying including a carriage carrying depth sensing and distance sensing means and adapted to be rolled along the pipe between the pipe laying ship and the bottom of the body of water. Depth and distance are simultaneously recorded.

Offshore terminal with underwater foundation

Abstract: In an offshore terminal with underwater foundation and underwater pipeline leading from the shore to the foundation, a tower in which a pipe runs up, from the pipeline to connecting facilities at the top; the tower has floatation tanks and is hinged to the foundation for selective erection, whereby the top of the tower projects above the waterline, and for folding down for the tower to lie on the ocean floor. The bottom of the tower when erected, being releasably locked to the foundation.

Submarine Pipeline Support By Marine Sediments

Abstract: An approximate method for determining the initial settlement of a submarine pipeline in cohesive marine soils was derived by use of analogy to theories developed for use with foundations on land. Equations and a graph provide upper and lower limits of the probable range of initial settlement in terms of the submerged weight of a unit length of the pipeline, soil cohesion, and the external pipe diameter. The limitations of soil sampling, the variability of soil cohesion along the route of a pipeline, and the need for experimental and field work on the determination of submarine pipeline settlement are discussed.

Topics in coastal engineering

Abstract: Harbors, development of longshore current formulas, radiation stress, determination of currents along a coast, longshore sand transportation, local coastal accretion, beaches with groins, wave forces on piles, offshore constructions, offshore moorings, submarine pipelines.

Technical Capabilities in Offshore Pipellne Operations to Maximize Safety

Abstract: Reviews the design, construction, and operation of offshore pipelines, with emphasis on steps which are normally taken to maximize safety and thereby to minimize the cost of failures. Offshore pipeline failure experience is reviewed and governmental regulations which govern offshore pipelines are discussed.

Offshore Pipeline Construction Stress Measurement

Abstract: Stresses induced in offshore pipelines were measured during construction of a 24 and a 20-inch pipeline in 200 and 250 feet of water, respectively. Barge motions, pipe tension, and pipe travel relative to the laybarge were recorded simultaneously on the barge. A total of fifteen pipe sections were tested during various sea and current conditions. This paper reviews instrumentation procedures, describes test results and compares results with calculated values. Static stresses and profiles determined from the measurements are compared with the theoretical solutions.

Predicting behavior of suspended pipelines in the sea

Abstract: Describes an analytical procedure permitting the determination of the static and dynamic behavior of pipeline systems suspended below the sea surface. The procedures make it possible to evaluate behavior in either a two or three-dimensional manner. Examples applied to a ball jointed pipeline system are included.