46 



DESIGN OF THE SEALAB II HABITAT 



Oxygen System 



The automatic and manual oxygen systems are in accordance with Fig. 26. This system is 

 designed for automatic (normal) operation utilizing a "Krasberg" POj sensor and servo valve 

 supplied by Westinghouse Corporation. Provisions are also made for bypassing the servo valve 

 for manual operation. The external storage bottles are piped to two separate manifolds of five 

 and six bottles each. During operation, one bottle on each manifold was "on line" at all times, 

 such that in case of failure upstream of the gas- control panel, a backup supply may be selected 

 immediately inside Sealab. Note: Make-up oxygen shall be introduced into the discharge duct 

 of the ventilation system downstream of the gas- sampling line. The oxygen input is downstream 

 of the fan motor to reduce fire hazard and is in a high- velocity or turbulent region to provide 

 complete mixing. 



MANUAL O2 MAKE-UP 

 AUTOMATIC O2 MAKE-UP 



SCRUBBER-FILTER 

 EXHAUST PLENUM -. 



PO2 SENSORaT 



I 

 1 

 ) 



r" 



3000 PSI H.R 



MANUAL O2 MEASUREMENT-* 

 2-200 CU FT BOTTLES 



7^ 



SERVO VALVE 



DISTRIBUTIONS, 

 DUCT 



GAS CONTROL 

 PANEL 



GAS FLOW 





NOTE: GAS SAMPLING LINE 

 TO BE UPSTREAM OF 

 O2 MAKE-UP 



STUFFING TUBE 



5- HULL (BOTTOM) 



02 STORAGE, EXTERNAL, II-I300CUFT 

 BOTTLES ON TWO MANIFOLDS 



Fig. 26. Sealab II oxygen system 



Helium System 



The helium system is in accordance with Fig. 27. This system is designed to provide any 

 make-up required in Sealab and is designed for manual operation. The ten external storage 

 bottles are piped to a single manifold. During operation one bottle was "on line" at all times. 

 The helium input is introduced into the air system upstream of the circulating fan to provide 

 adequate mixing. 



