| Sampling Criteria and Procedures for Underwater Inspection of Waterfront Facilities |
DEC 86 |
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| Authors:
R. L. Brackett; NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA
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 | Sampling criteria have been developed for planning and executing an underwater inspection of waterfront structures. The proposed sampling criteria use the scientific approach to sampling, where an estimate of the condition and the extent of required maintenance is obtained, which guarantees that the inspection will gather information that can be analyzed in a manner consistent with standard statistical practices. Data obtained using these criteria can be compared to each other ... |
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| DEVELOPMENT OF A METHODOLOGY FOR UNDERWATER INSPECTION OF STEEL STRUCTURES |
FEB 85 |
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| Authors:
A. S. Birring; A. Smith; R. L. Brackett; SOUTHWEST RESEARCH INST SAN ANTONIO TX
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| an inspection plan for thickness measurement of corroded steel waterfront structures is presented. the plan included identification of candidate inspection systems, evaluation of their performance, and selection of the best system based on technical performance and inspection costs. the benefits of inspection are computed using the selected beam alignment system. (author) |
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| ECONOMIC MODEL TO DETERMINE THE BENEFITS OF INSPECTING STEEL WATERFRONT STRUCTURES |
AUG 83 |
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| Authors:
A. Singh; R. King; R. L. Brackett
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| the objective of the study described in this paper was to determine the economic benefits of using an inspection/repair plan to maintain waterfront structures. the simulation results showed that an inspection/repair plan is economically more beneficial than a replacement plan. (author/ntiac) |
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| Pulse Echo Ultrasonic Techniques for Underwater Inspection of Steel Waterfront Structures |
JUN 1983 |
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| Authors:
R. L. Brackett; L. W. Tucker; R. Erich; NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA
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| Laboratory tests were made to: (1) determine the measurement accuracy using three different methods of acquiring and interpreting the ultrasonic data, (2) identify operator training requirements and optimum information feedback techniques for the diver, and (3) analyze the electrical power transmission characteristics of the ultrasonic system and identify any potential safety hazards to the diver. Due to the problems associated with multiple front surface echoes, digital ultrasonic thickness gages should ... |
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| AUTOMATED INSPECTION OF CORRODED STEEL STRUCTURES |
APR 83 |
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| Authors:
A. Singh; R. Mcclintock; T. W. Rudwick Iii; R. L. Brackett
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| deterioration caused by corrosion of steel can result in catastrophic failures of waterfront facilities and other offshore structures. inspection of corroded steel structures is largely limited to visual examination. however, this is not a reliable nondestructive method for thickness measurement because it is limited to assessing surface damage. a novel ultrasonic concept has been developed and integrated into an automated scanning system. this concept uses a focused ultrasonic transducer centered ... |
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| AN EVALUATION OF PULSE ECHO ULTRASONIC TECHNIQUES FOR UNDERWATER INSPECTION OF STEEL WATERFRONT STRUCTURES |
MAY 81 |
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| Authors:
R. L. Brackett; L. W. Tucker; NAVAL CONSTRUCTION BATTALION CENTER PORT HUENEME CALIF NAVAL SCHOOL
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| the authors discuss ultrasonic testing techniques including the equipment description and an initial laboratory test setup. they also discuss electrical safety in the program, underwater testing, ultrasonic scanner developments, development of an underwater surface mill, together with conclusions and recommendations. emphasis was eventually on investigation of specialized transducer technology and development of techniques to smooth the irregular front surface condition. descriptions are given of work conducted on corrosion pitted steel ... |
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| UNDERWATER INSPECTION OF WATERFRONT FACILITIES |
81 |
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| Authors:
R. L. Brackett
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| more than two-thirds of the waterfront facilities of the naval shore establishment are over 30 years old; most of these facilities have reached or exceeded their original design life, resulting in escalating maintenance and repair costs. the underwater inspection of waterfront facilities is limited at present largely to visual observations. hidden deterioration cannot be identified accurately until it progresses to the point where it is revealed by an abnormal surface ... |
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| Anacapa Island Split Pipe Installation Inspection and Repair, 1978-1979. |
FEB 1980 |
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| Authors:
W. R. Tausig; R. L. Brackett; CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CA
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| The U.S. Navy currently maintains and operates numerous underwater power and signal cables. Most of the these cables utilize split pipe systems to protect the cable from damage in the surf zone and when crossing exposed rocky seafloors. Past experience has shown that the hardware used to install the split pipe system lacks the reliability and maintenance-free operation required for the life of the cables. Based on previous experience with ... |
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| Design and Installation of Nearshore Ocean Cable Protection Systems |
NOV 79 |
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| Authors:
R. L. Brackett; P. J. Valent; J. B. Ciani; R. E. Elliott; L. W. Hallanger; NAVAL FACILITIES ENGINEERING COMMAND WASHINGTON DC CHESAPEAKE DIV
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| This handbook deals with the protection of that portion of an ocean cable system which passes through the nearshore zone. This zone is defined as an indefinite area that extends seaward from the shoreline to well beyond the breaker zone. For the purpose of this work, the outer limit of this zone has been established as the distance from shore at which the water depth is great enough that the ... |
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| Anacapa Island Split Pipe Inspection of June 1977 and April 1978. |
SEP 1978 |
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| Authors:
W. R. Tausig; R. L. Brackett; CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CALIF
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| The U.S. Navy currently maintains and operates numerous underwater power and signal cables. Most of these cables utilize split pipe systems to protect the cable from damage in the surf zone and when crossing exposed rocky seafloors. Past experience has shown that the hardware used to install the split pipe system lacks the reliability and maintenance-free operation required for the life of the cables. Based on previous experience with cable ... |
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| Improved Hardware and Techniques for Maintenance and Repair of Split-Pipe-Protected Cables. |
AUG 1977 |
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| Authors:
R. L. Brackett; W. R. Tausig; CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CALIF
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| The U.S. Navy currently maintains and operates numerous underwater power and signal cables. Most of these cables utilize split pipe systems to protect the cable from damage in the surf zone and when crossing exposed rocky seafloors. Past experience has shown that the hardware used to install the split pipe system lacks the reliability and maintenance-free operation required for the life of these cables. Based on previous experience with cable ... |
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| Development and Evaluation of a Motion Compensating Lift System for Deep Ocean Construction. |
DEC 1975 |
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| Authors:
L. W. Hallanger; R. L. Brackett; CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CALIF
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| A system to raise and lower loads in the deep ocean while providing lift-line tension control and payload motion control was designed, fabricated, and tested. Design parameters included a maximum wet payload weight of 40,000 pounds at a maximum operating depth of 6,000 feet through sea conditions state 4 when the system is mounted on an ARS-type vessel. A load-handling system of this type allows soft landing of a payload ... |
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| Hand-Held Hydraulic Rock Drill and Seafloor Fasteners for Use by Divers. |
AUG 1975 |
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| Authors:
R. L. Brackett; A. M. Parisi; CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CALIF
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| Underwater construction operations require an improved diver-operable rock drill and efficient and reliable seafloor rock fasteners. An experimental hydraulically powered rock drill was fabricated from commercially available components. The results from the shallow-water testing of this drill were used to design a prototype underwater rock drill capable of operating to ocean depths of 120 feet. Testing of the prototype rock drill revealed that it either met or exceeded initial performance ... |
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| Test and Evaluation of Underwater Mateable Hydraulic Quick Disconnects for Use in Diver Tool Systems. |
NOV 1974 |
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| Authors:
R. L. Brackett; A. M. Parisi; CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CALIF
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| The Civil Engineering Laboratory has been investigating hardware and techniques that allow the diver to connect and disconnect hydraulic tools underwater in order to use several tools during a single dive. Two commercially available non-air including couplings were tested and evaluated for use as underwater mateable hydraulic quick-disconnect couplings. Tests were conducted at 1-foot, 35-foot, and 75-foot depths. It was found that both non-air including couplings met or exceeded the ... |
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| Development, Test, and Evaluation of a Underwater Grout-Dispensing System for Use by Divers. |
JUL 1974 |
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| Authors:
A. M. Parisi; R. L. Brackett; CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CALIF
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| Diver installed seafloor fasteners are used extensively to stabilize oceanographic cables and to secure structures to rocky areas of the ocean bottom. As part of a program aimed at improving the quality of these seafloor fasteners, an experimental diver-operated grout-dispensing system was developed to be used in conjunction with various groutable fasteners. The experimental grout dispenser consists of a low-speed, high-torque hydraulic motor coupled to a progressing cavity grout pump ... |
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| Hydraulic Pressure Intensifiers for Use by Working Divers. |
MAY 1974 |
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| Authors:
A. M. Parisi; R. L. Brackett; CIVIL ENGINEERING LAB (NAVY) PORT HUENEME CALIF
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| The need for a reliable high pressure (10,000 psi) source of hydraulic power for use by divers has led to the evaluation and modification of two commercially available hydraulic pressure intensifiers, The operation of the internal mechanism of the intensifiers as well as the modifications made to each are described. Tests of both intensifiers on land and underwater as well as necessary refinements to each system are delineated. Results indicate ... |
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