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RESEARCH PAPERS

J. Energy Resour. Technol. 1980;102(4):181-183. doi:10.1115/1.3227870.

Experimental data on pressure gradients were obtained for gas bubbling through static liquids in various concentric annulus configurations with eight different liquids. Although a definite liquid physical property effect exists, the Gilbert “S” curve gave an adequate representation of the data. A more accurate correlation was developed, together with a physical model that separates hydrostatic and friction components of the pressure gradient.

Commentary by Dr. Valentin Fuster
J. Energy Resour. Technol. 1980;102(4):184-189. doi:10.1115/1.3227871.

A three-dimensional, transversely isotropic yield condition is combined with a plane of weakness to describe the initial yield limit for Green River Shale. This theory is compared to experimental results for two different qualities of oil shale, including true three-dimensional tri-axial stress tests. It is interesting to note that a decrease in the anisotropy of the material with increasing mean stress is predicted by the yield condition and is borne out by the experimental results. For large confining stresses, the material ceases to fail preferentially along the plane of weakness.

Topics: Rivers , Stress , Anisotropy
Commentary by Dr. Valentin Fuster
J. Energy Resour. Technol. 1980;102(4):190-196. doi:10.1115/1.3227872.

A unified three-dimensional formulation of the pipeline or riser problems is developed by following the rod theories. A rigorous singular perturbation technique is used to solve the associated two-dimensional nonlinear problem. The results can be used with a programmable calculator.

Commentary by Dr. Valentin Fuster
J. Energy Resour. Technol. 1980;102(4):197-202. doi:10.1115/1.3227873.

Inertia coefficients for arrays of cylinders, such as might be found in risers or conductor pipes, are determined. The method used is theoretical and does not take into account viscous-related phenomena. Values of the inertia coefficient for individual cylinders in three different geometrical arrays are determined using the method of images. It is shown quite vividly the effect the geometry can have on the individual cylinder values.

Commentary by Dr. Valentin Fuster
J. Energy Resour. Technol. 1980;102(4):203-213. doi:10.1115/1.3227874.

A discrete multi-degree-of-freedom model is used to study the dynamic response of marine riser systems to loads generated by sea waves and currents. A linearization scheme is used to determine an approximate solution for the system response. A variety of studies regarding the effects of system and environmental parameters on the maximum bending stress and the maximum bottom angle are presented.

Commentary by Dr. Valentin Fuster
J. Energy Resour. Technol. 1980;102(4):214-222. doi:10.1115/1.3227875.

This paper attempts to identify the principal parameters that influence the behavior of drilling and production risers and to explain how and why they do so. Clear understanding of these influences enable particular risers to be optimized rapidly without recourse to an inordinate number of computer analyses. The points of greatest concern, to the riser designer, are: stress levels in the main length of riser; angular movement at sea bed (or moment, if the connection is rigid); relative movement at riser/platform connection. The approach used in the paper has been to derive analytical expressions, for simplified riser cases. Conclusions drawn from these expressions have then been checked for validity, by using a dynamic analysis computer program to simulate a wide range of cases.

Commentary by Dr. Valentin Fuster
J. Energy Resour. Technol. 1980;102(4):223-229. doi:10.1115/1.3227876.

The safety of externally pressurized manned diving bells, submersibles and underwater work systems resides in the ability of the system to rise to the surface in case of an emergency. Use of the ASME Boiler and Pressure Vessel Code Section VIII design rules, lead to unacceptably heavy structures, and thus substantially compromise the sought-for safety in underwater manned systems. A recognition on the part of the diving industry of the inherent limitations in using the ASME Boiler and Pressure Vessel Code for design of underwater pressure vessels, motivated the formation of the ASME Safety Code Committee on Pressure Vessels for Human Occupancy (PVHO) in 1974. A subcommittee of the PVHO Safety Code Committee was formed to address the specific problems of external pressure vessel design. The mathematical development which provided the basis for the proposed rules are presented. The restrictions imposed by the External Pressure Subcommittee are also presented.

Commentary by Dr. Valentin Fuster
J. Energy Resour. Technol. 1980;102(4):230-233. doi:10.1115/1.3227877.

Many European refuse incinerators utilize the heat derived from refuse incineration for steam or hot water supply to district-heating systems or to certain industries for generation of electricity, for sludge drying, etc. The design of five typical incinerators with heat recovery is outlined and the value of recovered energy in terms of fuel oil savings is tabulated.

Commentary by Dr. Valentin Fuster
J. Energy Resour. Technol. 1980;102(4):235-241. doi:10.1115/1.3227880.

The introduction covers the historical development of the Imperial Metal Industries Ltd. Power Plant and the psychology behind that development. The investigation into the concept of firing solid waste into boilers is detailed, as well as the final design parameters. Details are given of the performance achieved so far, including the problems that had to be overcome. Finally, the author gives his opinion of advantages to the energy industry and the community.

Commentary by Dr. Valentin Fuster
J. Energy Resour. Technol. 1980;102(4):242-250. doi:10.1115/1.3227884.

In drilling from floating vessels, most operators and drilling contractors specify an allowable lower ball joint angle of 3–5 deg for drilling and 1–3 deg for running casing. Presently, no one uses tension in the drill pipe or casing as a factor in setting allowable ball joint angles. The results of the analysis detailed in this paper show that the allowable ball joint angles in use are justified for well depths less than 5000 ft below the ball joint. However, the allowable angle is too high for continual operation for well depths below the ball joint of 10,000 ft or more. The increased drill pipe or casing tension in deeper wells causes high alternating stresses in the drill pipe and high wear rates where the pipe bears against equipment in the ball joint region. The principal conclusion of this paper is that the allowable lower ball joint angle should not be constant, but should vary with the tension in the drill pipe as the well is being drilled.

Commentary by Dr. Valentin Fuster

DISCUSSIONS

Commentary by Dr. Valentin Fuster
J. Energy Resour. Technol. 1980;102(4):234. doi:10.1115/1.3227879.
FREE TO VIEW
Abstract
Topics: Heat
Commentary by Dr. Valentin Fuster

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