DESIGN OF THE SEAEAB U HABITAT 43 



Fixed Ballast 



A concrete deck is installed inside Sealab n from the entryway forward to provide a por- 

 tion of the fixed ballast. The remainder of the fixed ballast is placed in trays underneath the 

 hull. 



EQUIPMENT 



General 



All mechanical equipment to be installed in Sealab II (Fig. 24) was checked and certified 

 for use in the ambient operational environment. Particular emphasis was placed on eliminating 

 any materials which may introduce toxic fumes into the closed atmosphere. All equipment cav- 

 ities or enclosures are vented for pressure equalization or are tested to prove a capability of 

 withstanding the pressure of or permeation by the Sealab 11 atmosphere. Particularly all "an- 

 eroid type" sensing elements were eliminated, since they are designed to operate only in stand- 

 ard (air) at barometric pressures. All equipment was performance tested in the Sealab II 

 environment and design capacities adjusted where necessary to compensate for the peculiar 

 characteristics of the new environment, such as hyperbaric pressures, increased density, 

 higher specific heat, increased thermal conductivity, etc. 



Water Closet 



The water closet is a standard marine type, Wilcox- Crittendon "Senior" model. 



Lavatory 



The lavatory is vitreous china, 17 x20 in. minimum size, and may be wall or cabinet 

 mounted. 



Sinks 



Two sinks are required, one in the galley and one in the laboratory. The sinks are double 

 basin, self-rim, porcelain enamelled steel and approximately 33 x 22 in. overall dimensions. 



Water Heater 



The water heater is electrically powered, quick recovery, and has a 50-gallon storage 

 capacity. It is equipped with a pressure-temperature safety relief valve set at 100 psig relief 

 pressure. Note: This setting can be accomplished under normal atmospheric conditions. The 

 relief valve discharge was piped to a convenient overboard drain (see Chapter 9). 



Emergency Fresh Water Tank 



An emergency fresh- water tank was installed inside Sealab II to provide approximately 

 150-gallon storage capacity. This tank will not be used as a pressure tank and is provided 

 with an adequate vent to prevent pressure buildup while filling. It was constructed of CRES 

 and properly sterilized for storage of potable water (see section titled "Plumbing and Sanitary 

 Facilities"). 



Showers 



Two showers are provided in the entryway, starboard side. The showers are drained di- 

 rectly overboard through the main entry hatch. 



