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Title: Technology Development Plan: Geotechnical survey systems for OTEC (Ocean Thermal Energy Conversion) cold water pipes: Final subcontract report

Abstract

This report provides an overview of current and developing technologies and techniques for performing geotechnical investigations for siting and designing Cold Water Pipes (CWP) for shelf-resting Ocean Thermal Energy Conversion (OTEC) power plants. The geotechnical in situ tools used to measure the required parameters and the equipment/systems used to deploy these tools are identified. The capabilities of these geotechnical tools and deployment systems are compared to the data requirements for the CWP foundation/anchor design, and shortfalls are identified. For the last phase of geotechnical data gathering for design, a drillship will be required to perform soil boring work, to obtain required high-quality sediment samples for laboratory dynamic testing, and to perform deep-penetration in situ tests. To remedy shortfalls and to reduce the future OTEC CWP geotechnical survey costs, it is recommended that a seafloor-resting machine be developed to advance the friction cone penetrometer, and also probably a pressuremeter, to provide geotechnical parameters to shallow subseafloor penetrations on slopes of 35/degree/ and in water depths to 1300 m. 74 refs., 19 figs., 6 tabs.

Authors:
;
Publication Date:
Research Org.:
Solar Energy Research Inst., Golden, CO (USA)
OSTI Identifier:
5855259
Report Number(s):
SERI/STR-253-3485
ON: DE89000899
DOE Contract Number:
AC02-83CH10093
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; OCEAN THERMAL POWER PLANTS; SITE CHARACTERIZATION; ACOUSTICS; BOREHOLES; DESIGN; ELECTRICAL SURVEYS; HAWAII; OCEAN THERMAL ENERGY CONVERSION; PENETROMETERS; PIPES; PROGRESS REPORT; SAMPLING; SEDIMENTS; SURVEYS; CAVITIES; CONVERSION; DOCUMENT TYPES; ENERGY CONVERSION; FEDERAL REGION IX; GEOPHYSICAL SURVEYS; MEASURING INSTRUMENTS; NORTH AMERICA; POWER PLANTS; SOLAR ENERGY CONVERSION; SOLAR POWER PLANTS; THERMAL POWER PLANTS; USA; 140800* - Solar Energy- Ocean Energy Systems

Citation Formats

Valent, P.J., and Riggins, M. Technology Development Plan: Geotechnical survey systems for OTEC (Ocean Thermal Energy Conversion) cold water pipes: Final subcontract report. United States: N. p., 1989. Web.
Valent, P.J., & Riggins, M. Technology Development Plan: Geotechnical survey systems for OTEC (Ocean Thermal Energy Conversion) cold water pipes: Final subcontract report. United States.
Valent, P.J., and Riggins, M. 1989. "Technology Development Plan: Geotechnical survey systems for OTEC (Ocean Thermal Energy Conversion) cold water pipes: Final subcontract report". United States. doi:.
@article{osti_5855259,
title = {Technology Development Plan: Geotechnical survey systems for OTEC (Ocean Thermal Energy Conversion) cold water pipes: Final subcontract report},
author = {Valent, P.J. and Riggins, M.},
abstractNote = {This report provides an overview of current and developing technologies and techniques for performing geotechnical investigations for siting and designing Cold Water Pipes (CWP) for shelf-resting Ocean Thermal Energy Conversion (OTEC) power plants. The geotechnical in situ tools used to measure the required parameters and the equipment/systems used to deploy these tools are identified. The capabilities of these geotechnical tools and deployment systems are compared to the data requirements for the CWP foundation/anchor design, and shortfalls are identified. For the last phase of geotechnical data gathering for design, a drillship will be required to perform soil boring work, to obtain required high-quality sediment samples for laboratory dynamic testing, and to perform deep-penetration in situ tests. To remedy shortfalls and to reduce the future OTEC CWP geotechnical survey costs, it is recommended that a seafloor-resting machine be developed to advance the friction cone penetrometer, and also probably a pressuremeter, to provide geotechnical parameters to shallow subseafloor penetrations on slopes of 35/degree/ and in water depths to 1300 m. 74 refs., 19 figs., 6 tabs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1989,
month = 4
}

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  • This document presents the plan for validating the ocean systems response codes used in the OTEC community. Ocean systems used here includes the platform, the CWP, and the mooring system. The objectives of the present program are to acquire test data on the response of the ocean system to wave excitation available frequency domain computer codes. If the codes are not fully validated upon comparison of the test data with the calculations, the objectives are to identify discrepancies, establish the range of code usefulness and to recommend improvements. Model tests will be conducted in the OTC model basin with themore » CWP extending into the 30 foot deep pit. This limits the model scale to 1:110. Three types of prototype CWP's will be modeled: rigid, articulated and compliant. Two mooring stiffnesses will be tested based on the Lockheed mooring study. The model platform is a modified version of the APL barge redesigned to improve seakeeping performance. Computer code calculations will be made with the ROTEC and NOAA/DOE frequency domain codes. Standard response parameters will be compared with the test data (stress and motion maxima, significant and RMS magnitudes as well as selected RAO's). Wave drift forces will be estimated and compared to test data.« less
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  • An important step in the development of technology for Ocean Thermal Energy Conversion (OTEC) cold water pipes (CWP) is the at-sea testing and subsequent evaluation of a large-diameter fiberglass-reinforced plastic (FRP) pipe. Focus has been on the CWP since it is the most critical element in any OTEC design. This report presents the results of the second phase of the CWP At-Sea Test Program. During this phase an 8-foot diameter, 400-foot long sandwich wall FRP syntactic foam configuration CWP test article was developed, constructed, deployed and used for data acquisition in the open ocean near Honolulu, Hawaii. This instrumented CWPmore » was suspended from a moored platform for a three-week experiment in April - May, 1983. The CWP represented a scaled version of a 40-megawatt size structure, nominally 30 feet in diameter and 3000 feet long.« less
  • This specification covers the fiberglass reinforced plastic cold water pipe (CWP) system for a 40 MW Ocean Thermal Energy Conversion modular demonstration plant. Included are requirements for materials, workmanship, delivery, assembly, inspection and quality assurance qualifications requirements for the pipe manufacturer and the contractor constructing the CWP system.
  • The overall purpose of this project is the conceptual design of two OTEC commercial plants. This report presents results of task VII: a plan for the development of an OTEC Demonstration Plant including funding, key milestones, fallbacks, etc. Studies include a risk assessment survey, OTEC Demonstration Plant ocean systems requirements, OTEC Demonstration plant power and transmission system requirements, electric utility survey, market assessment, and a demonstration plan. (WHK)