PRINCIPLES OF NAVAL ENGINEERING 



or the salt water side of a condenser. No open 

 flame or tool which might cause a spark should 

 be brought close to a newly opened condenser. 

 Personnel are not to be permitted to enter a 

 newly opened condenser until it has been 

 thoroughly blown out with steam or air. 



8. The salt water side of a condenser must 

 be drained before flooding of the steam side and 

 must be kept drained until the steam side is 

 emptied. 



9. The relief valve (set at 15 psig) mounted 

 on the inlet water chest is to be lifted by hand 

 whenever condensers are secured. 



10. If a loss of vacuum is accompanied by a 

 hot or flooded condenser, the units exhausting 

 into the condenser must be slowed or stopped 

 until the casualty is corrected. Condensate must 

 not be allowed to collect in condenser and over- 

 flow into the turbines or engines. 



11. Condenser shell relief valves are to be 

 lifted by hand before a condenser is put into serv- 

 ice, 



12. No permanent connection which could 

 subject the salt water side to a pressure in ex- 

 cess of 15 psig, is to be retained between any 

 condenser and a water system. 



13. No permanent connection which could 

 allow salt water to enter the steam side of the 

 condenser, is to be retained. 



14. Test the main circulating pump bilge suc- 

 tion, when so directed by the engineer officer. To 

 conduct this test, it is generally necessary only 

 to start the main circulating pump, open the bilge 

 suction line stop or check valve, and then close 

 down on the sea suction line valve to about 3/4 

 closed, or until the maximum bilge suction 

 capacity is obtained. 



MAINTENANCE 



Condensers, heat exchangers and associated 

 equipment should be periodically tested and in- 

 spected to ensure that they are operating 

 efficiently. Preventive maintenance is much 

 more economical than corrective maintenance. 

 All preventive maintenance should be conducted 

 in accordance with the 3-M System (PMS Sub- 

 system). As an example, figure 13-6 shows two 

 maintenance requirement cards, one for a main 

 condenser and the other for a deaerating feed 

 tank. Note: These cards contain specific infor- 

 mation for conducting the specified preventive 

 maintenance actions. 



360 



