Accession Number:

AD0743880

Title:

Evaluation of Bottom Breakout Reduction Methods

Descriptive Note:

Final rept. Apr 1970-Jun 1971

Corporate Author:

NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA

Personal Author(s):

• Vaudrey, Kennon D.

Report Date:

1972-04-01

Pagination or Media Count:

30.0

Abstract:

Breakout forces present problems in making retrieval lifts by increasing the lift force requirement, creating a dynamic snap-load in the lifting line, and causing control difficulty during ascent. Three breakout reduction methods are tested using small submersible-sized objects. These methods are mud suction tubes, water flooding, and air jetting. The results showed that all methods were effective at reducing the breakout force to less than 10 of the wet weight of the object. Diver handling techniques are evaluated and described. Also, a review of three methods which calculate breakout forces is presented.

Descriptors:

• *SALVAGE
• TEST METHODS
• OPERATION
• RELEASE MECHANISMS
• OCEAN BOTTOM
• MUD
• HYDROSTATIC PRESSURE

Subject Categories:

• Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE