PUMPS AND VALVES

As an Engineman, you will operate various types of pumps and valves. You will also be responsible for routine maintenance of this equip-ment in your spaces and possibly throughout the ship. The machinery of a system cannot work properly unless the pumps and valves are in good working order. In this chapter, we will discuss basic types of pumps and valves. Our discussion will also include the need for flange safety shields and the purpose of equipment tag-out. The in-formation in this chapter is general. You should refer to the appropriate NAVSEA technical manual for specific information about various pumps and valves used on your ship.

TYPES OF PUMPS

Pumps are by far the most numerous units of auxiliary machinery aboard ship. The types or classes of pumps used aboard ship include (1) ro-tary pumps, (2) centrifugal pumps, (3) variable-stroke reciprocating pumps, and (4) jet pumps. You can find straightforward explanations and illustrations of the basic principles of each type of pump in Fireman, NAVEDTRA 10520-H. This manual also discusses how the characteristics of each pump make it adaptable to a particular ser-vice in various engineering systems. We recom-mend that you review the information on pumps in Fireman, NAVEDTRA 10520-H, before you begin to study the information in this chapter.