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Title	DEVELOPING BLANKING DEVICE FOR HULL OPENINGS FOR USE DURING THE UNDERWATER INSPECTION OF VLCC AND ULCC VESSELS
Accession No	00173037
Authors	Hamano, S; Tsuna, H
Journal Title	Hitachi Zosen Technical Review Vol. 38 No. 1
Corp. Authors / Publisher	Hitachi Zonsen Company Limited, Technical Inst
Publication Date	19770300
Description	5 p.; References(3)
Languages	Japanese
Abstract	Under provisional Rules issued by NK, ABS, and LR, surveys of large ships in dry dock (except special periodical surveys) can be replaced by underwater inspections. In such inspections, closing of the sea-water suction and discharge openings presents a problem, and the Authors report on a diaphragm-type blanking device, made of synthetic rubber, which has been developed (in a suction and a discharge version) for its solution. Shop tests showed that the device meets the Rules requiring that the sea connection be completely closed from outside while a sea valve is being overhauled in the ship. It was found that, to prevent leakage the air pressure on the diaphragm should be at least 0.8 kg/cm square above the hydrostatic pressure of the water. One closing device for discharge can be used for sea connections of the water. One closing device for discharge can be used for sea connections of four different sizes; for large connections, as the external force becomes greater either air-pressure or diaphragm breadth must be increased; provision of supporting pieces to supplement the air pressure is recommended. To decrease the weight for ease of handling, grp is recommended as a construction material.
TRT Terms	Drydock operations ; Hulls ; Inspection ; Openings ; Very large crude carriers
Other Terms	Hull openings; Underwater inspection; Vlcc drydocking
Subject Areas	M19 SHIP CONSTRUCTION, CONVERSION, AND REPAIR
Availability	Linda Hall Library
Document Source	British Ship Research Association
TRIS Files	MRIS
Database	TRIS Online

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