Drains are of standard type and generally well laid out.  Tank top drains have been retained, however, and a hazard to tank integrity is thereby introduced.  
July, 1946
- 1 -


          Piping from washbasins and heads is discussed in the S36 section of the report.  
          Deck drains are provided as follows:  
From space aft of aft WRT to bilge at forward end of ATR 1
After toilet deck to A.T.R. bilge 1
Conning tower to control room bilge 2
No. 1 automatic battery switch cabinet to control room bilge 1
No. 1 battery deck to control room bilge 5
Galley deck to sanitary tank 2
Galley range to sanitary tank 1
Ready provision locker to sanitary tank 1
No. 2 automatic battery switch cabinet to sanitary tank 1
No. 2 battery deck to FTR bilge 1
Forward toilet to FTR bilge 1
          Bilge drains from equipment and fittings are provided as follows:  
From each air manifold drain valve
From each inboard vent on a tank or tube
From each cock which has a venting position
From each venting connection on water piping systems
From ventilation blower casings and inboard and outboard ventilating hull valves
From each relief valve connection on water and air piping systems
From main engine exhaust valves
          The conning tower drains, and the great majority of all other drains, are equipped with funnels to avoid siphoning suction or return flow.  The only drains not so equipped are those which are well down in the ship where there is no possibility of introducing self perpetuating fluid columns or possibility of endangering equipment as a result of the drainage flow.  
    - 2 -


          Drains from fuel oil and lubricating oil venting and drain points are provided with funnel, piping from which leads to collecting tanks or oil cans.  
          The waterway between the tank tops and the pressure hull is drained by scuppers extending through the tank tops.  The piping through the tanks is given an S curve to avoid making it act as part of the structure.  
          Deck drains are complete and properly located.  The use of the battery wells as bilges is avoided at the expense of carrying certain drain lines through bulkheads into adjacent compartments.  
          Bilge drains from equipment are otherwise complete.  The extensive use of pans, cans and lines to collecting tanks are evidence of the attempts made to conserve oil and prevent it from getting into the bilges.  
          The tank top drains do not appear to have been considered by the Germans as a hazard to tank integrity, although the installation was in effect similar to the one removed from U.S. submarines, with the same consideration for expansion.  
    - 3 -



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