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 TM 55-1925-273-10-1
0028 00
COMPONENTS OF THE ROWPU
Table 1 outlines the major functional components of the ROWPU system. The item number corresponds to the callouts in
figure 6. The components are outlined in a logical fashion that will allow the reader to understand the basic operating
principles of the ROWPU. The ROWPU contains two units. ROWPU 1 (the starboard unit) is fitted with two reverse
osmosis membranes, and ROWPU 2 (the port unit) has only one membrane.
Table 1. Major Functional Components of the ROWPU System (Refer to Figure 6)
Item No.
Nomenclature
Description
(Refer to
Figure 6)
1
ROWPU System General
The pressure reducing valve ensures that overall general service
Service Pressure Reducing
system pressure is maintained at a maximum of 60 PSI (4.1 bar).
Valve
2
ROWPU System Raw Water
The cutout valve allows the operator to secure raw water
Cutout Valve
to the ROWPU system.
3
ROWPU System Raw Water
The pressure regulator maintains the raw water supply to the
Pressure Regulator
ROWPU system at a constant pressure of 40 PSI (2.8 bar).
4
ROWPU System Pressure
The pressure relief valve protects the ROWPU system by providing
Relief Valve
pressure relief when raw water pressure exceeds 50 PSI (3.4 bar).
5
ROWPU System Media Filter
The media filter uses sand as a substrate to remove larger particles
that would cause clogging of the 20-micron pre-filter. The
substrate in the media filter requires very infrequent change out due
to the ability to back flush. During back flushing, the media filter is
completely isolated from the rest of the ROWPU system, while raw
water from the general service system cleans and flushes debris
overboard. The media filter prolongs the service life of the
20-micron filter.
6
20-micron Filter
The 20-micron pre-filter removes all particulate in the raw water not
removed by the media filter down to particles 20 microns in size.
This filter serves to prolong the service life of the 5-micron pre-filter.
7
5-Micron Filter
The 5-micron pre-filter removes all particulate in the raw water not
removed by the 20-micron pre-filter down to particles 5 microns in
size. This filter serves to prolong the service life of the reverse
osmosis membranes.
8
High Pressure Pumps
The high pressure pumps provide a source of low volume, high
pressure raw water to the reverse osmosis membranes. The high
pressure pumps are rated to deliver 4 gallons (15.1 liters) of filtered
raw water per minute, at a maximum operating pressure of 900 PSI
(62 bar). The high pressure pumps provide the fluid energy necessary
to cause the osmosis process to be reversed in the membranes.
0028 00-7
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