ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
0003 00
DESCRIPTION AND THEORY OF OPERATION
THEORY OF OPERATION
The RO membranes do not require regular cleaning. When required, cleaning is similar to that for the
MF. For RO cleaning, the RO Clean Feed Valve V-701 is opened to direct the circulation through the RO.
When shut down for more than 54 hours, both the MF fibers and RO membranes require preservation to
avoid growth of biological material on the fiber and membrane surfaces. The MF fibers are preserved
with caustic (or the high pH cleaning solution which includes detergent and the caustic). The RO
membranes are preserved with sodium bisulfite, which is either flushed through the RO elements, or
circulated as a cleaning solution. These solutions are drained, but not flushed.
COLD WEATHER MODULE
The Cold Weather Module is employed during cold weather operations (temperatures below 32F to
-25F) to prevent water in the TWPS from freezing. The Cold Weather Module is provided with the
A-TWPS or as an extended capability module for the MC-TWPS and includes the following main
components (see Figure 31) (see WP 0002 for a complete listing and illustrations of all the major parts):
Diesel-fired forced hot air space heater provides heat to the enclosed TWPS.
General purpose transformer provides power for the electrical components of the heater.
Motor-driven raw water pump heating collars wrap around the pumps that are deployed off the
TWPS skid and keep the water in the pump from freezing.
Insulating pump covers cover the pump skids that are deployed off the TWPS skid and insulate
the pumps and motors/diesel engines from the elements.
Non-floating ice intake strainer. This strainer is used for ice hole operation in place of the floating
inlet strainer.
Ice hole auger. Used to drill a hole in the ice
Insulating platforms are placed under each pump skid that is deployed off the TWPS skid.
Electric hose heating blankets cover each hose that is deployed off the TWPS skid and prevent
the water in the hoses from freezing.
A winter cover is provided as an extended capability module for the MC-TWPS. The cover
encloses the TWPS skid and protects the TWPS from the elements. The A-TWPS comes
supplied with a fabric wall that encloses the front of the flat rack containing the TWPS skid.
FABRIC
GENERAL PURPOSE
WALL
RETURN
AIR DUCT
OUTLETS
HOT AIR DUCT
DIESEL HEATER
Figure 31. A-TWPS Cold Weather Diesel Heater Deployment.
END OF WORK PACKAGE
0003 00-34
