As a Fireman, you were introduced to the fire-main systems used in Navy ships. As an Engineman, you will be required to know the location of the principal isolation valves of the firemain system in the engineering spaces and adjacent spaces on your ship. The location of the valves used to isolate sections of the firemain varies from one ship to another. In general, isolation valves are located in the mainstream, in the fire main, in the risers, and in horizontal leads. In learning the location of isolation valves in your ship, study the piping diagram of the firemain system. Make a sketch of the system, noting particularly the location of each valve. So that confusion and the possibility of error can be eliminated when sections of the firemain are being isolated, all important valves in the fire-main system are marked with identification numbers. All engineering personnel should know both the location and the identification number of each valve.

SUMMARY

In this chapter, we have discussed the design and function of various electrohydraulic drive machinery and weight-handling equipment. We have also provided a brief discussion of the galley, scullery, and laundry equipment you may be required to maintain. In our discussion of auxiliary boilers, we have explained the basic design and components of water-tube and fire-tube boilers and the importance of boiler water testing, and the types of chemical tests for water used in auxiliary boilers. We have stressed the importance of safety components and procedures and your responsibility for learning about the location and function of the firemain and isolation valves. If you are uncertain concerning any of these sections, we recommend you review the information in this chapter before you begin to answer the questions in the correspondence course.