INSTALLATION P8 



This installation was marked by a problem with the S/A device. The 

 anchor did not fire and was brought to the sea surface after 30 minutes 

 to inspect the safe status of the anchor. It was completely safe, the 

 in-line/out-of-line plunger in the S/A device was completely out of 

 line. Upon disassembly, it was found that the S/A device had been 

 activated, and the firing pin was driven against the plunger. The 

 plunger did not go in line. The plunger was supposed to be completely 

 in line at a depth of 35 to 40 feet (11 to 12 m) . The water depth was 72 

 feet (22 m) , and the plunger had not even moved. The reason became 

 apparent when the S/A was again screwed into the breech. Pressure built 

 up between the S/A base and cartridge base because there was considerable 

 grease on the S/A threads preventing pressure relief. This problem was 

 rectified by filing a V groove across the S/A threads to allow pressure 

 relief; this problem did not recur. A grooved S/A device was installed, 

 the anchor replaced on the seafloor, and fired. The anchor was proof- 

 loaded to 150 kips (670 kN) . 



INSTALLATIONS P9, P10, T1 



Each anchor was fired and test-pulled to 100 to 120 kips (445 to 

 535 kN) . Total assembly time was now reduced to about 1-1/2 to 2 hours. 



INSTALLATION T2 



The large 3-1/2 x 7-foot (1.0 x 2.0 m) fluke was used for the first 

 time. When installed in the gun system, the fluke rests about 2 inches 

 (50 mm) above the seafloor. There was concern that gun barrel pressures 

 could increase when the fluke contacted the competent coral prior to the 

 piston fully leaving the barrel. This concern was rapidly abated after 

 this firing because the penetration depth and the measured peak gun 

 pressure were similar to those experienced at the permanent site and 

 were close to what would be expected for any unlithified seafloor. This 

 fluke was statically loaded to 100-120 kips (445 to 435 kN) ; however, 

 the load did jump to 165 kips (735 kN) for a brief period because of 

 wave action on the YC barge. There was no noticeable fluke movement. 



INSTALLATION T3, T4, T5 



All three anchors were installed rapidly and test-pulled to 100 to 

 120 kips (445 to 535 kN) . In order to save time, the last five pistons, 

 used with anchors T4 through T8, were not recovered. Each piston had 

 been used previously; and, as leaving them in place apparently had no 

 adverse effect upon anchor holding capacity, they were not pulled. 



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