TM 55-1930-209-14&P-1 Table 13-3.  ROWPU System Valves (continued) Label Identification Type Valves Location and Valve Function 3-in. RO11 ROWPU space - in CARTRIDGE FILTER TO HIGH gate valve HP pump suction line PRESSURE PUMP; Allows filtered seawater from cartridge filter assembly to flow to HP pump 3-in.   RO12 ROWPU space - in- BRINE TO OVERBOARD gate valve board of pretreatment DISCHARGE; allows brine to skid flow overboard from RO block when making product water 3/4-in.   RO13 ROWPU space - near MEMBRANE CLEANING 2-way membrane cleaning SOLUTION RETURN; allows flow ball valve solution drum of membrane cleaning solution back to drum 3/4-in.   RO14 ROWPU space - near MEMBRANE CLEANING 2-way membrane cleaning SOLUTION INPUT; allows ball valve solution drum membrane cleaning solution to flow from drum 3-in.   RO15 ROWPU space - be- PRODUCT WATER TO STORAGE gate valve tween RO block and TANKS; allows product water HP pump from RO block to flow to drinking water storage tank 3-in.   RO16 ROWPU space - between HIGH PRESSURE PUMP BYPASS; gate valve RO block and HP pump allows flow of membrane cleaning solution to RO block bypassing HP pumps 1/4-in.   RO17 ROWPU space - in BRINE SAMPLING; for 2-way brine discharge piping taking samples of brine ball valve near valve RO7 output from RO block 3-in.   RO18 ROWPU space - in SEAWATER TO ROWPU; gate valve pretreatment skid allows flow of seawater to seawater Input piping ROWPU pretreatment skid 3-in. RO19 ROWPU space - inboard MEMBRANE CLEANING gate valve (Barges of pretreatment skid SOLUTION RECIRCULATION; 2 and 3 during RO block membrane only) cleaning, allows cleaning solution to recirculate through seawater pump 3-in. RO20 ROWPU space - between PRODUCT WATER TO gate valve (Barges RO block and HP pump OVERBOARD; allows flow of 2 and 3 product water from RO block to only) overboard 4-in. R021 Void 3 port shell PRODUCT WATER gate valve (Barges OVERBOARD DISCHARGE; 2 and 3 allows product water from RO only) block and RO 20 to flow overboard 13-22