322 



ENGINEERING EVALUATION 



OXYGEN MAKE-UP 8. GAS SAMPLING 



SCRUBBER-FILTER 

 EXHAUST PLENUM 



DISTRIBUTION 

 DUCT. SEE DWG. 

 NO. C-8747) 



TO 1/4 I.D. GAS 

 SAMPLING HOSE 

 (APPROX. 30'L0NG) 



STUFFING TUBE 



TO UMBILICAL 

 CONNECTIONS TOPSIDE 



HULL (BOTTOM) 



Fig. 128. Sealab II emergency 

 helium, air and oxygen system 



Gas-Sampling System 



A gas-sampling system was designed to allow topside monitoring of the atmosphere of 

 Sealab II. This system allowed sampling throughout the interior and in the ventilation plenum. 

 The gas- sampling intake was located in the outlet of the ventilation system, upstream of the 

 oxygen input, in order to obtain samples of well-mixed and filtered atmosphere. An additional 

 gas-sampling intake was provided via a 30-ft length of 1/4-in. I.D. hose for sampling at any 

 desired point inside the Sealab. The gas-sampling system was connected to the Atmosphere 

 Control Van on the surface vessel via the gas-sampling hose in the umbilical cord. The gas- 

 sampling system also doubled as an emergency oxygen supply from the surface. 



AFT TO QUICK-CONNECT 

 OUTLETS (AUTO. SHUTOFF) 

 12 OUTLETS IN ENTRY 

 SPACE a 4 IN LAB. SPACE 



EMERGENCY 

 BREATHING 

 MANIFOLD 



3000 PS I HP 



-? 



L.PO-300 

 PSI (120 

 PSI NOM) 



FWD. TO QUICK -CONNECT 

 OUTLETS (AUTO, SHUTOFF) 

 "12 OUTLETS IN BERTH SPACE 

 a 4 IN GALLEY SPACE 



■GAS CONTROL 

 PANEL 



^STUFFING TUB 



USE 

 — HULL (BOTTOM) 



He (85%) -02 (15%) PREMIX STORAGE, EXTERNAL, 

 3-1300 CU. FT BOTTLES ON MANIFOLD 





Fig. 129. Sealab II Bibb system 



