INTRODUCTION 



Under the sponsorship of the Naval Facilities Engineering Command (NAVFAC), the 

 Naval Civil Engineering Laboratory (NCEL) has developed a metal detecting system. This 

 system was developed for use by the Underwater Construction Teams (UCTs) to locate buried 

 or submerged metallic pipe, chain, anchors, and miscellaneous ferrous objects. The tool is a 

 marinized Forster Ferex magnetometer (Model 4.021) and is designed for use in either a dipping 

 mode (from an inflatable boat) or a self-contained diver-operated mode. 



Attributes of the system include the following: 



1. Visual and audio output. 



2. Adjustable sensitivity. 



3. Adjustable standoff device between the magnetic sensor and the operator. 



4. Rechargeable battery-powered system (each set lasts up to 6 hours). 



5. Minimal maintenance at the UCT level (the unit is sealed and will not be broken 

 down for repairs or overhaul except by the Depot maintenance activity Ocean 

 Construction Equipment Inventory (OCEI) or manufacturer). 



This report documents the development of the Diver-Operated Buried Pipe and Chain 

 Lx)cator (BP«&CL), and provides documentation to support the production milestone decision. 



BACKGROUND 



An efficient, safe, and reliable metal detecting system for UCT use is required to provide 

 underwater detection and tracking of the following items: 



1. Chain (1-1/2 inches or larger) buried up to 6 feet. 



2. Pipelines buried up to 2-1/2 feet. 



3. Anchors (6,000 pounds) buried up to 10 feet. 



4. Armored cable (SD List 5) buried up to 3 feet. 



In the past, several types of diver-operated systems have been investigated and developed 

 for use by Naval Underwater Demolition Team (UDT) and Explosive Ordnance Disposal (EOD) 

 divers. These include the MK-14 magnetometer, a cesium vapor magnetometer, and the MK-10 

 gradiometer. However, these developments were tailored to the special requirements of ordnance 



