of actual operating battery life since the unit was not generating any audio output during the 

 tests. It is estimated that actual battery life will consist of at least 25 hours of operation. 



The detection thresholds were met for all items listed in the TEMP. This includes a 

 detection range of: (1) 2-1/2 feet for 5-inch-diameter Simplex pipeline (with a layer of armor), 

 (2) 3 feet for SD list 5 armored cable, (3) 6 feet for 1-1/2-inch chain, and (4) 10 feet for a 

 6,000-pound anchor. 



The weight and balance of the tool in the diver-operated mode was judged acceptable by 

 the divers. However, making the probe end of the standoff device neutrally buoyant would add 

 to the tool's effectiveness. In the dipping mode of operation it was noted that the unit can be 

 used effectively from an inflatable boat. The speed of the boat must be kept slow enough to 

 permit the probe to remain perpendicular to the seabed. 



RECOMMENDATIONS 



Based on the results of the development effort, it is recommended that: 



1 . The Buried Pipe and Chain Locator be approved for limited production of three systems. 



2. The performance of die three systems should be monitored by NCEL during a UCT operation 

 to insure a smooth transition into fleet use. 



3. The User Data Package prepared during the RDM effort should be updated with as-built 

 drawings after fabrication of the three production systems. 



4. The Buried Pipe and Chain Locator should be included in the NCTC school as part of the 

 training curriculum. 



REFERENCES 



1. Naval Civil Engineering Laboratory. Memorandum to files on the survey of diver-operated 

 metal detecting systems, by Eastport International, Inc. Port Hueneme, CA, Jul 1985. 



2. Naval Explosive Ordnance Disposal Technology Center Itr Ser FL/165 of 19 Sep 1985. 

 Subj: Use of MK-10 magnetometer. 



3. M. Oliver, CEC (DV). Personal communication. Naval Civil Engineering Laboratory, 

 Ocean Operations Division, Port Hueneme, CA, Jan 1986. 



4. H. Herrman. Telephone conversation, NAVFAC and H. Thomson and S. Black, NCEL, 

 Mar 1988. 



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