TM 55-1930-209-14&P-2 Table 3-2.  Seawater System Valves (continued) Figure 1-3 Label Identification Type Callout Location and Valve Function 1-in gate valve SW24 Void 2 starboard - In SEAWATER PUMP 1 TO seawater supply line CHLORINATION UNIT: between seawater pump Allows seawater from sea- 1 and valve SW48 water pump 1 to be supplied to chlorination system 1-in gate valve SW25 Void 2 starboard - In SEAWATER PUMP 2 TO seawater supply line CHLORINATION UNIT: between seawater pump Allows seawater from sea- 2 and valve SW48 water pump 2 to be supplied to chlorination system 2 1/2-in gate valve SW26 Void 2 starboard - In SEAWATER FILTER OVER- seawater filter drain BOARD DISCHARGE: line on starboard shell Allows seawater  from filter drain lines to discharge directly overboard 1 1/2-in gate valve SW27 Void 2 port - In cool- STRAINER 3 TO AIR CONDITIONER ing pump supply line COOLING PUMP: Allows seawater to flow to cooling pump and isolates pump from strainer 3 1-in globe valve SW28 Void 2 port- In cool- AIR CONDITIONER COOLING (Barges ing seawater inlet line WATER: Allows seawater from 2 and 3 cooling pump to flow to air only) conditioning cooling coils and isolates pump from air conditioning unit 4-in globe valve SW29 Void 2 starboard - In SEAWATER PUMPS TO ballast tank fill line BALLAST TANK: Allows on discharge side of seawater to flow from seawater seawater pump 1 pumps into ballast tank and isolates ballast tank 2-in gate valve SW30 Deckhouse workshop -In SEAWATER SEACHEST seachest vent line VENT: Allows seachest venting 1/4-in gate valve SW31 Void 2 starboard - In STRAINER 1 PRESSURE IN: seawater supply line on Allows pressure reading input side of strainer 1 on supply side of strainer 1 1/4-in gate valve SW32 Void 2 starboard - In STRAINER 1 PRESSURE seawater supply line OUT: Allows pressure on discharge side of reading on discharge side strainer 1 of strainer 1 1/4-in gate valve SW33 Void 2 starboard - In STRAINER 2 PRESSURE IN: seawater supply line on Allows pressure reading input side of strainer 2 on supply side of strainer 2 1/4-in gate valve SW34 Void 2 starboard - In STRAINER 2 PRESSURE seawater supply line OUT: Allows pressure on discharge side of reading on discharge side strainer 2 of strainer 2 3-8