Fig, 5 12 Hatch and cover ot NEKTON GAMMA 



Electrical: 



There is a wide variety of electrical hull 

 penetrations (Chap. 7) which serve an 

 equally wide variety of functions. Basically 

 the penetrator is sealed by an 0-ring to 

 prevent low pressure leakage and a hard 

 metallic backup ring for a metal-to-metal 

 seal at high pressure. Figure 5.13 presents 

 the design of a penetrator for DEEP QUEST. 

 By tightening the retaining nut the joint can 

 be made to seal properly. 



Mechanical: 



Because of the tremendous pressures ex- 

 erted on the hull of a deep-diving submers- 

 ible, thru-hull rotating or reciprocating me- 

 chanical shafts and linkages are generally 

 avoided. If the propulsion motor, for exam- 

 ple, was located within the hull and rotated a 

 propeller-driven shaft which penetrated the 

 hull, a dynamic seal capable of limiting the 

 leakage of seawater into the hull at differen- 



HULL FITTING BODY 



-SPACER 



WASHER 



RETAINER NUT 



LOCKING NUT 



MOLDED BOOT 



Fig. 5.13 DEEP QUESTS electrical penetrator. 



257 



