breakfast, lunch, dinner and snacks were 

 provided. A sample for each is shown below. 



The results of BEN FRANKLIN's life sup- 

 port system, as mentioned, are thoroughly 

 and exhaustively discussed in reference (16), 

 and the reader is referred to these analyses 

 for detailed information. Therefore, only 

 highlights of the various life support fea- 

 tures follow. 



A plot of oxygen level, carbon dioxide and 

 cabin pressure throughout the mission (Fig. 

 9.22) shows that the oxygen level remained 

 between 19.5 and 22 percent. All adjustments 

 were made manually with the flowmeter. 

 The automatic control, originally part of the 

 system, was disconnected to eliminate the 

 need for an inverter and thus conserve elec- 

 trical energy. 



The carbon dioxide level was maintained 

 between 0.4 and 1.5 percent. The anticipated 

 buildup rate scheduled that the LiOH panels 

 be changed every 2.5 days; but, the actual 



need was closer to every 3 days. Subsequent 

 analysis yielded a carbon dioxide generation 

 rate of approximately 1.7 pounds per man 

 day. 



Atmospheric pressure ranged between a 

 low of 1.01 atmospheres at the start of the 

 mission to a high of 1.12 atmospheres. The 

 highs occurred twice, once when the boat 

 surfaced and was under tow, and again at 

 the end of the mission. After the first day, a 

 slight air leak in the pressure regulator from 

 the variable ballast tanks was detected and 

 corrected. Cabin pressure then increased to 

 1.025 atmospheres. Subsequent variations 

 were due to temperature changes which cor- 

 relate with ambient temperature at various 

 depths. 



Temperature and humidity variations 

 have been discussed. It is significant that 

 the data evaluators recommended insulation 

 and heaters for cold water work. 



Throughout the mission, contaminants 

 were checked on a daily and a weekly basis. 

 After some 5 days, carbon monoxide started 



< 



< 



CO 

 CO 



Z 



LU 

 O 



QC 

 III 



a. 



O 



I- 



z 

 til 

 o 

 cc 



LU 



a. 



1.12 



1.08 



1.04 



1.00 

 1,5 



1.0 



0.50 



MISSION DURATION, DAYS 



Fig. 9.22 Log of air pressure, COj and O2 inside BEN FRANKLIN. [From Ref. (16)] 



448 



