Parker Pure Water Series Owner's manual

Pure Water Series
PW 8,000-20,000 GPD
Installation, Operation & Maintenance
Village Marine-PW 3000
Part Number: 95-0027

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TABLE OF CONTENTS
1.0 SYSTEM DESCRIPTION 1
1.1 SPECIFICATIONS 1
1.1.1 PERFORMANCE CHARACTERISTICS 1
1.1.2 PHYSICAL CHARACTERISTICS 2
1.1.3 UTILITY REQUIREMENTS 2
1.1.4 ENVIRONMENTAL REQUIREMENTS 3
1.2 EQUIPMENT REQUIRED FOR OPERATION 3
1.2.1 CONSUMABLES 3
1.2.2 TEST EQUIPMENT 4
2.0 PREPARATION FOR USE, INSTALLATION AND INITIAL ADJUSTMENT 5
2.1 UNPACKING AND HANDLING 5
2.2 LOCATION 5
3.0 GENERAL THEORY OF OPERATION 9
3.1 REVERSE OSMOSIS THEORY 9
3.2 APPLICATION OF REVERSE OSMOSIS 10
3.3 PRODUCT WATER QUALITY STANDARDS 11
3.4 FACTORS AFFECTING PERMEATE PRODUCTION 11
3.4.1 VARIATIONS IN TEMPERATURE, PRESSURE AND SALINITY 11
3.4.2 TEMPERATURE CORRECTION FACTOR 12
3.5 OPERATIONAL DESCRIPTION 14
3.5.1 FILTRATION SYSTEM 14
3.5.2 REVERSE OSMOSIS SYSTEM 14
3.5.3 PRODUCT MONITORING SYSTEM 15
3.5.4 MEMBRANE CLEANING SYSTEM 15
3.6 WATER QUALITY MONITOR 16
3.6.1 PUSHBUTTONS 16
3.6.2 DISPLAYS AND LIGHTS 16
3.7 CONTROLS AND INSTRUMENTATION 16

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4.0 OPERATION 19
4.1 START-UP PROCEDURE 19
4.2 SHUTDOWN PROCEDURES 21
4.2.1 SHUTDOWN PROCEDURE (SHORT TERM) 21
4.2.2 SHUTDOWN PROCEDURE (EXTENDED) 22
4.3 FRESH WATER FLUSH PROCEDURE 22
5.0 MAINTENANCE INSTRUCTIONS 23
5.1 GENERAL 23
5.2 RAW WATER STRAINER INSPECTION 24
5.3 FILTER ELEMENT CLEANING OR REPLACEMENT 24
5.4 DRIVE BELT INSPECTION AND REPLACEMENT 25
5.5 RO MEMBRANE CLEANING 26
5.5.1 CLEANING CHEMICALS 26
5.5.2 WHEN TO CLEAN 27
5.6 RO ELEMENT PRESERVATION 30
5.7 RESTARTING UNIT AFTER PRESERVATION 31
5.8 HIGH PRESS7URE PUMP OIL CHANGE 31
5.9 HIGH PRESSURE PUMP MOTOR LUBRICATION 31
5.10 INSPECTION LOG 31
6.0 PRESSURE VESSELS AND MEMBRANES 34
6.1 PRESSURE VESSEL DISASSEMBLY 34
6.3 PRESSURE VESSEL ASSEMBLY 36
7.0 PRESERVATION FOR STORAGE 38
8.0 TROUBLESHOOTING 38
9.0 SYSTEM DRAWINGS AND DIAGRAMS / PARTS LIST 39

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LIST OF FIGURES
Figure 2.0 - Recommended Installation (Below Water Line) ............................................ 5
Figure 2.1 - Proper Installation (Above Water Line) ......................................................... 6
Figure 3.0 - Simple (Reverse) Osmotic System ............................................................... 9
Figure 3.1 - Simplified Schematic of an RO System....................................................... 10
Figure 5.0 - Maintenance Task Chart ............................................................................. 23
Figure 5.1 - Sample Operational Log ............................................................................. 32
Figure 5.2 - Sample Discrepancy Report ....................................................................... 33
Figure 6.0 - Pressure Vessel End Plug .......................................................................... 34
Figure 6.1 - Brine Seal Orientation................................................................................. 35
Figure 6.2 - End Plug Installation Aid ............................................................................. 36
LIST OF TABLES
Table 1.0 - Performance Specification ............................................................................. 1
Table 1.1 - Unit Dimensions ............................................................................................. 2
Table 1.2 - Unit Weights................................................................................................... 2
Table 1.3 - HP Pump Horsepower.................................................................................... 2
Table 1.4 - Utility Requirements ....................................................................................... 2
Table 1.5 - Design Flow ................................................................................................... 3
Table 1.6 - Nominal Operating Conditions ....................................................................... 3
Table 1.7 - Consumables ................................................................................................. 4
Table 1.8 - Recommended Test Equipment..................................................................... 4
Table 3.0 - WHO Drinking Water Standards .................................................................. 11
Table 3.1 - Factors Affecting Permeate Quality.............................................................. 12
Table 3.2 - Temperature Correction Factors (TCF)........................................................ 13
Table 3.3 - Instrumentation and Controls ....................................................................... 18
Table 4.0 - Valve/Switch Line Up - Initial Start-up .......................................................... 19
Table 5.0 - Filter Tank Parts List. ................................................................................... 24
Table 5.1 - Chemical Requirements ............................................................................... 26
Table 5.2 - Lubrication Requirements ............................................................................ 31

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The following are the types of flags used in this technical manual. They designate safety
related items and important operational instructions and should be given special attention
when they appear in the text:
Text formatted in this manner concerns an operating procedure or practice
that, if not strictly observed, can result in injury to personnel or loss of life.
Text formatted in this manner concerns an operating procedure or practice
that, if not strictly observed, can result in damage to or destruction of
equipment.
Text formatted in this manner concerns an operating procedure or
condition that warrants special attention.
WARNING
CAUTION
NOTE

PW-3000 to PW-20000 Manual 1 Last Revised 01/12
1.0 SYSTEM DESCRIPTION
The Village Marine Tec. (VMT) Seawater Desalinator is a single-pass purification
system that uses reverse osmosis (RO) as its method of seawater desalination. This
unit produces potable (drinking) quality water with salt concentrations of < 500 ppm by
removing approximately 99% of the dissolved salt in seawater.
This manual covers the following models: PW3000, PW4000, PW5000, PW6000,
PW7000, PW8000, PW10000, PW12000, PW16000 and PW20000. The principle of
operation is the same for all models. Specific differences are noted, where applicable.
1.1 SPECIFICATIONS
1.1.1 PERFORMANCE CHARACTERISTICS
Parameter Specification
Raw water temperature range: 1-40°C (33-108ºF)
Design RO element pressure: 800 psi
Max. RO element pressure: 1000 psi
Max. feedwater residual chlorine: < 0.1 ppm
pH range (short term for cleaning): 4-10 (3-11)
Membrane type: Thin film composite
Nominal product water production: (2)
PW-3000 2.1 gpm
PW-4000 2.8 gpm
PW-5000 3.5 gpm
PW-6000 4.2 gpm
PW-7000 4.9 gpm
PW-8000 5.6 gpm
PW-10000 6.9 gpm
PW-12000 8.3 gpm
PW-16000 11.1 gpm
PW-20000 13.9 gpm
(2) Raw water temperatures less than 25°C (77ºF) will result in less than rated
product water output. Conversely, higher raw water temperatures will result in
higher than rated output.
Table 1.0 - Performance Specification

PW-3000 to PW-20000 Manual 2 Last Revised 01/12
1.1.2 PHYSICAL CHARACTERISTICS
PW3000
-
5000 PW6000
PW7000
-
12000
PW16000
-
20000
Length 84" 84" 84" 84”
Width 34" 44" 48" 52”
Height 35" 35" 35" 43”
Table 1.1 - Unit Dimensions
PW3000 PW4000 PW5000 PW6000 PW7000
Weight 800 LB 900 LB 1000 LB 1050 LB 1500 LB
PW8000 PW10000 PW12000 PW16000 PW20000
Weight 1600 LB 1800 LB 1900 LB 2200 LB 2250 LB
Table 1.2 – Unit Weights
1.1.3 UTILITY REQUIREMENTS
See the nameplate attached to top of the unit for power requirements.
PW3000 PW4000 PW5000 PW6000 PW7000
Motor HP 10 10 15 15 15
PW8000 PW10000 PW12000 PW16000 PW20000
Motor HP 20 20 25 25 30
Table 1.3 – HP Pump Horsepower
Utility Connection
Design Pressure
Minimum
(psi)
Design Pressure
Maximum
(psi)
Raw water inlet 1 ½” ANSI Flange 0 50
Reject discharge* 1 ½” ANSI Flange 0 15
Product water discharge 1” ANSI Flange 0 15
Flush water inlet 1 ½” NPT 20 50
* Vacuum condition at shutdown is not acceptable, syphon breaker may be reqd.
Table 1.4 - Utility Requirements

PW-3000 to PW-20000 Manual 3 Last Revised 01/12
Unit Raw water inlet
(gpm)
Reject discharge
(gpm)
Product water
discharge
(gpm)
PW-3000 14 12 2.1
PW-4000 14 11 2.8
PW-5000 20 16 3.5
PW-6000 20 16 4.2
PW-7000 20 15 4.9
PW-8000 24 19 5.6
PW-10000 30 23 6.9
PW-12000 36 28 8.3
PW-16000 36 26 10.4
PW-20000 43 29 13.9
Table 1.5 – Nominal Design Flow
1.1.4 ENVIRONMENTAL REQUIREMENTS
Parameter Specification
Ambient temperature: 1-40°C (33-108ºF)
List (permanent): 15º
Trim (fore and aft): + 30º
Pitch: ± 10º (6 sec cycle)
Roll: ± 30º (12 sec cycle)
Table 1.6 - Nominal Operating Conditions
1.2 EQUIPMENT REQUIRED FOR OPERATION
1.2.1 CONSUMABLES
The following is the normal quantity of equipment consumed during 6 months of
standard unit operation:
NOTE
Only Village Marine Tec approved filters and chemicals should be used.

PW-3000 to PW-20000 Manual 4 Last Revised 01/12
Description QTY VMT Part No.
PW3000-6000 PW7000-20000
Cleaning Chemical #1, 25 lbs 2 3 85-0045
Cleaning Chemical #2, 25 lbs 2 3 85-0048
Preservative Chemical #3, 25 lbs 1 1 85-0049
Filter, 100 ft
2
, 5 Micron 6 6 33-5100
Filter, 100 ft
2
, 20 Micron 6 6 33-2100
Flushing Filter 2 2 See Parts Dwg
Oil, HP Pump, Quart 20 20 85-0050
LP Pump Mech Seal Kit 1 1 90-0108
HP Pump Service Kits 1 1 See Pump Manual
Table 1.7 - Consumables
1.2.2 TEST EQUIPMENT
The following table lists the basic equipment recommended to perform most types of
verification testing and system maintenance. The salinity meter allows the operator to
perform routine sampling of the RO membranes:
Description VMT Part No.
Kit, pH Test, 0-14 (10 strips): 90-0135
Meter, Handheld Analog, 0-5000 ppm: 40-5000
10X Range Extender for Analog Meter: 40-5001
Alternate Digital Handheld meter, 0-1000 ppm: 99-1990
Solution, Calibration, 300 ppm: 90-1300
Solution, Calibration, 30,000 ppm: 90-1301
Table 1.8 - Recommended Test Equipment

PW-3000 to PW-20000 Manual 5 Last Revised 01/12
2.0 PREPARATION FOR USE, INSTALLATION AND INITIAL
ADJUSTMENT
2.1 UNPACKING AND HANDLING
Remove unit from shipping crate and inspect for shipping damage.
CAUTION
Do not allow unit or any components to be exposed to freezing
temperatures. If it is anticipated that the unit may be exposed to freezing
temperature, please contact VMT in advance for technical assistance.
2.2 LOCATION
The RO unit should be installed in a dry, sheltered location protected from direct
weather. Some type of drainage should be provided beneath the RO unit to allow
standing water to drain when performing maintenance or repair (see system diagram in
Section 9.0 for skid size, interface locations and minimum maintenance envelope
requirements).
For units without a pressurized feed, it is recommended that the RO unit be mounted in
a location below the vessel's waterline. This will ensure a flooded suction to the unit at
all times.
Figure 2.0 - Recommended Installation (Below Water Line
without Pressurized Feed)
It is important that the product water line is
connected to the top of the storage tank with an
air gap to prevent chlorinated water from
siphoning back into the watermaker.
Raw water inlet, 1½” through
hull with sea cock, as low as
possible and towards the aft of
the boat, forward of the drive.
Reject discharge line
overboard and above
water line.

PW-3000 to PW-20000 Manual 6 Last Revised 01/12
If it is not possible to mount the watermaker below the water line, the boost pump can
lift to a maximum height of 15 feet (5 feet for 50 Hz units) above the water line with the
boost pump removed from the frame and installed below the RO frame near the through
hull. A check valve might be required in the suction line to maintain adequate system
priming. Locating the system any more than 15 feet above the water line requires
installation of external pumps to maintain a pressurized feed.
Figure 2.1 - Proper Installation
(Above Water Line)
Since every installation is unique, the mounting instructions are provided for guidance
only. It is recommended that you use your own discretion as to the exact method of
mounting and placement of any mounting bolts.
1) Place the RO unit in an appropriate location and use existing holes or drill new
holes for a minimum of four point mounting by studs or bolts. Mount the RO unit
securely making sure that the base of the unit is continuously supported.
2) Make the following plumbing connections to the RO unit's piping interfaces (refer
to Section 9.0 for the exact piping interface locations):
a) Connect the raw water supply (1½" flange connection inlet) to a clean
seawater source.
CAUTION
Raw water inlet, 1-1/2” through
hull with sea cock, low as possible
and towards the
Aft of the vessel, forward of the
drive.
Reject discharge
line overboard and
above water line.
It is important that the product water line is
connected to the top of the storage tank to prevent
chlorinated water from siphoning back into the
watermaker.
Boost pump below water line
with flooded suction.

PW-3000 to PW-20000 Manual 7 Last Revised 01/12
Inlet and discharge interconnecting lines should be constructed of a NON-
FERROUS material. Examples of some suitable materials are PVC,
copper-nickel, 316 stainless steel pipe or a reinforced non-collapsing
hose. Ferrous piping produces rust that will irreversibly foul the
membrane and void the RO unit warranty.
NOTE
Avoid connecting the inlet piping to any water line that services any other
piece of equipment. Air could be drawn through the RO unit causing
damage to the RO unit's pumps.
b) Connect the reject discharge 1½" flanged connection to an unobstructed
line connected to an appropriate drain. If the reject is discharged
overboard, the discharge port should be above the waterline. On above
waterline installations where the reject goes down more that 10 feet to its
outlet, install a vacuum breaker or vent to prevent any negative pressure
or vacuum situation at shutdown.
CAUTION
The use of galvanized steel for product piping should be avoided as small
amounts of rust may form that can be drawn back into the RO when the
system is off.
c) Connect the product water discharge 1" flanged connection to an
unobstructed line that is connected to the TOP of the product water storage
tank. If the storage tank water is chlorinated, a check valve or air gap should
be installed in the product line as a precaution to prevent chlorine damage of
the RO membranes. The air gap is often accomplished by teeing the product
connection to a tank vent or tank fill line of suitable size.
d) Connect the flush water inlet to the pressurized fresh water system on the
vessel. Do not exceed 50 psi pressure.
CAUTION
Exposing the membranes to chlorinated water may cause irreversible
damage and will void the RO unit warranty, so use the carbon flush filter
supplied.
3) Connect the following RO unit's electrical interfaces:
NOTE

PW-3000 to PW-20000 Manual 8 Last Revised 01/12
Strictly observe all applicable electrical codes and regulations governing
the installation and wiring of electrical equipment. Typical codes specify
the type and size of conduit, wire diameter and class of wire insulation
depending upon the amperage and environment. The power supply
should always be of a greater service rating than the requirements of the
RO unit. This will assure proper voltage even if power supply voltage is
slightly less than required. Never connect the RO unit to a line that
services another electrical device. The RO unit should have its own
dedicated power supply and breaker.
WARNING
Disconnect electrical power to RO unit and the power source before
connecting to RO unit interface. Failure to do so can cause serious
injury or death to personnel.
a) Connect the correct voltage/power supply to the three-phase or single phase
supply point in the Motor Starter Box. Correct high pressure pump rotation is
clockwise when viewing the motor fan (or counter-clockwise when viewing
from the shaft and pulley end. Correct rotation for the low pressure boost
pump is clockwise when viewing the motor fan.
IMPORTANT NOTE
Three phase power supplies will spin the motors and pumps either
rotation direction, depending on the phase sequence of the three hot
power legs. It is very important not to rotate the low pressure pump
backwards. Even “bumping” the motor for one second can cause
significant damage. The high pressure pump will not be damaged from
running backwards. Either use a phase meter to determine the rotation,
or use the high pressure pump only to check rotation and adjust the
input power legs accordingly prior to checking the low pressure pump. If
the low pressure pump is inadvertently “bumped” backwards, open the
pump and check the impellor is secured on the motor shaft and spins
freely prior to starting it again.
b) Connect a suitable ground to the RO unit skid (as determined by the
specifics of your installation).

PW-3000 to PW-20000 Manual 9 Last Revised 01/12
3.0 GENERAL THEORY OF OPERATION
3.1 REVERSE OSMOSIS THEORY
Reverse osmosis, like many other practical scientific methods, has been developed
from processes first observed in nature. Osmosis is a naturally occurring phenomenon
in which a semi-permeable membrane separates a pure and a concentrated solution (a
semi-permeable membrane is defined as one that preferentially passes a particular
substance). Every fluid has an inherent potential that is directly related to the type and
amount of solids in solution. This potential, referred to as osmotic pressure, increases
in proportion to relative concentration of a solution. A concentrated solution, therefore,
has an osmotic pressure that is higher than that of a pure solution.
In an osmotic system, the less concentrated solution will attempt to equalize the
concentrations of both solutions by migrating across the semi-permeable membrane.
When enough pure solution migrates across the membrane such that the inherent
potential difference between the solutions is no longer higher than the osmotic pressure
of the membrane, the purer solution will stop flowing. If the pressure on the
concentrated solution is increased to above the osmotic pressure, fluid flow will be
reversed. This condition, called Reverse Osmosis, can be established by artificially
pressurizing the more concentrated solution using a high pressure pump. In this type of
system, the concentrated solution (normally referred to as feedwater) will become more
concentrated as pure water flows out of solution and across the membrane to the
permeate side. Discounting the effects of feedwater temperature and salinity, the
operating pressure normally required to produce significant amounts of pure water is at
least twice the osmotic pressure of the membrane being used.
SALINE
SOLUTION
PURE
SOLUTION
SEMI-PERMEABLE MEMBRANE
ATMOSPHERIC
PRESSURE
(14.7 PSI)
SALINE
SOLUTION
PURE
SOLUTION
HIGH
PRESSURE
(800 PSI)
OSMOSIS REVERSE OSMOSIS
Figure 3.0 - Simple (Reverse) Osmotic System

PW-3000 to PW-20000 Manual 10 Last Revised 01/12
3.2 APPLICATION OF REVERSE OSMOSIS
Seawater contains many kinds of solids dissolved in solution. The most prevalent is
common table salt (sodium chloride). Other minerals that may be present in solution
are substances that usually contain various compounds of calcium and sulfate. The
sum of all of the solids dissolved in a particular sample of water is referred to as Total
Dissolved Solids or TDS. Seawater normally averages 32,000 to 35,000 ppm (parts per
million) TDS although variations of 5000 ppm are common in various parts of the world.
The fundamental goal any desalination process is a significant reduction in the amount
of dissolved solids in water.
In a Reverse Osmosis desalination system, most of the dissolved solids do not pass
through the membrane but are instead carried along the membrane surface. This
rejected water, referred to as brine, becomes increasingly more concentrated as it flows
along the surface of the membranes and is eventually piped to drain. The product water
that flows through the membrane is referred to as permeate. The percentage of
feedwater converted to permeate is called the recovery rate and is normally somewhere
between 20% and 30%. For example, a unit with a 29% recovery rate will produce 29
gallons of permeate for every 100 gallons of feedwater with the remaining 71 gallons
discharged to waste as brine. A higher than optimal recovery rate (which can be
obtained by increasing the back pressure on the unit above the recommended range)
results in greatly increased membrane fouling rates and a significant decrease in the
operational life of the membranes.
Figure 3.1 - Simplified Schematic of an RO System
FEEDWATER
CLEANING
SYSTEM
PRODUCT
MONITORING
SYSTEM
MEMBRANE
ARRAY
HIGH PRESSURE
PUMPING SYSTEM
FEEDWATER
PERMEATE
REJECT DISCHARGE
PRODUCT DISCHARGE
RAW WATER INLET
BRINE
PERMEATE > 500PPM
PERMEATE < 500PPM
FILTRATION
SYSTEM

PW-3000 to PW-20000 Manual 11 Last Revised 01/12
It should be noted that no system is capable of removing all of the dissolved solids from
seawater. The system is actually designed to reject approximately 99% of the TDS or,
in other words, to allow 1% of the 35,000 ppm TDS in the seawater to pass into the
product water. This yields water of less than 500 ppm, the recommended TDS for
drinking water. A system such as this is said to have a salt passage percentage of 1%
or a salt rejection of 99%.
3.3 PRODUCT WATER QUALITY STANDARDS
This RO unit will produce permeate (product water) with a quality of < 500 ppm TDS
and in accordance with World Health Organization (WHO) standards for drinking water.
General specifications for acceptable drinking water quality are as follows:
Constituent Ion/Molecule Maximum Limits (ppm)
Nitrate 10
Fluorine .1
Sulfate 100
Magnesium 30
Calcium 75
Calcium Carbonate 100
Iron .1
Manganese .05
Total Dissolved Solids 500
Turbidity 5
Oil .1
Detergents (anionic) .2
Phenols .001
Bacteria - E Coli (per 100 ml) 0
Table 3.0 - Drinking Water Standards
3.4 FACTORS AFFECTING PERMEATE PRODUCTION
3.4.1 VARIATIONS IN TEMPERATURE, PRESSURE AND SALINITY
The following table illustrates how the quality and quantity of permeate produced in by
RO system is affected by changes in temperature, salinity and pressure:

PW-3000 to PW-20000 Manual 12 Last Revised 01/12
With constant.... And increasing....
Permeate
TDS Capacity
Salinity and Pressure Temperature Increases Increases
Temperature and Pressure Salinity Increases Decreases
Temperature and Salinity Pressure Decreases Increases
Table 3.1 - Factors Affecting Permeate Quality
NOTE
If feedwater salt concentration decreases, the product water flow rate
should not be allowed to increase more than 20% above rated flow.
Reject pressure will need to be lowered to maintain rated flow in brackish
water or fresh water applications.
The RO system can be adjusted to maintain a constant permeate output when
feedwater salinity is below nominal (near river mouths or in estuaries). The operator
can do this by controlling system pressure manually via the back pressure regulator
valve, V3, located in the system brine piping. For long pump life and low membrane
fouling, VMT recommends that 800 psi is not exceeded except in situations of extreme
low temperature feed water.
CAUTION
Operating the unit at more than 120% of rated capacity in low salinity
water can damage the membranes and will void the RO unit warranty.
3.4.2 TEMPERATURE CORRECTION FACTOR
As previously described, the output capacity of any RO unit is highly dependent on
feedwater temperature. In order to quantify this relationship, theoretical data has been
utilized to develop Temperature Correction Factors (TCF) to compensate measured
flowrate to calculated flowrate at 25°C/77°F. This allows the operator to establish the
baseline flow for a given temperature, allowing more accurate troubleshooting. The
procedure for calculating the temperature compensated flow is as follows:
1) Measure raw water temperature and determine the corresponding correction
factor from Table 3.2 based on the measured temperature.
2) Note the actual product flow rate at the Product Flow meter. Multiply the actual
product flow meter flow rate by the correction factor from Table 3.2 to give
theoretical temperature compensated flow under standard conditions (25°C).

PW-3000 to PW-20000 Manual 13 Last Revised 01/12
Example:
Raw water temp: 15°C
TCF: 1.47
Actual product flow: 113.5 (gph)
Calculation: 113.5 x 1.47 = 167 (gph)
Temperature Corrected flow: 167 (gph)
(167 gph is the normal flow for a PW4000)
°C Factor °C Factor °F Factor °F Factor
1 3.64 26 0.97 34 3.47 84 0.88
2 3.23 26 0.94 36 3.18 86 0.82
3 3.03 28 0.91 38 3.18 88 0.79
4 2.78 29 0.88 40 2.68 90 0.79
5 2.58 30 0.85 42 2.47 92 0.77
6 2.38 31 0.83 44 2.29 94 0.75
7 2.22 32 0.80 46 2.14 96 0.73
8 2.11 33 0.77 48 2.01 98 0.70
9 2.00 34 0.75 50 1.88 100 0.68
10 1.89 35 0.73 52 1.77 102 0.65
11 1.78 36 0.71 54 1.68 104 0.63
12 1.68 37 0.69 56 1.59 106 0.61
13 1.61 38 0.67 58 1.51 108 0.59
14 1.54 39 0.65 60 1.44 110 0.57
15 1.47 40 0.63 62 1.36 112 0.55
16 1.39 41 0.61 64 1.30 114 0.53
17 1.34 42 0.60 66 1.24 116 0.51
18 1.29 43 0.58 68 1.17 118 0.49
19 1.24 44 0.56 70 1.12 120 0.47
20 1.19 45 0.54 72 1.08 122 0.45
21 1.15 46 0.53 74 1.05
22 1.11 47 0.51 76 1.02
23 1.08 48 0.49 78 1.00
24 1.04 49 0.47 80 0.93
25 1.00 50 0.46 82 0.90
Table 3.2 - Temperature Correction Factors (TCF)

PW-3000 to PW-20000 Manual 14 Last Revised 01/12
3.5 OPERATIONAL DESCRIPTION
3.5.1 FILTRATION SYSTEM
Seawater supplied to the intake of the Village Marine RO desalination unit will initially
flow through the raw water strainer, ST1, which removes large particulate matter.
Once through the strainer, the raw water is supplied to the low pressure boost pump,
P1, which raises the pressure of the water in order to provide enough positive feed
pressure to flow through the filtration system and into the suction of the high pressure
pump.
For units equipped with a (optional) Media Filtration System:
When a unit operates in areas where the raw water source of high turbidity or
organic materials, VMT recommends installing a media filtration system (IMF).
The media pump and filter, is installed upstream of the watermaker and will remove
particles as small as 25 microns in diameter. The filtration media is comprised a
multiple layers of specific materials that are specifically designed to remove
suspended particulate matter from the raw water stream. The benefit is to
significantly reduce the cleaning and replacement frequency for the micron filters.
When the media filter is fully loaded (indicated by high filter differential pressure), the
operator initiates a backwash cleaning cycle designed to flush trapped particulate
matter out of the filter and into the system drain. Please see the IMF manual or IMF
bulletin for further details.
The raw water next passes through the micron filter array, F1 & F2, which is designed
to reduce raw water turbidity to a nominal 5 microns in diameter. The micron filter array
consists of one 20 micron filter cartridge and one 5 micron filter cartridge.
Each filter housing contains one (1) filter element with an effective filtering area of 100
ft2and is equipped with an integral air/oil separator bleed. Bleed is continuously
discharged to the reject header and overboard.
The discharge pressure from the filter housings is monitored by a pressure gauge,
PG1, and pressure switch, PS1, that allow the operator to determine when the filter
elements require cleaning or replacement.
3.5.2 REVERSE OSMOSIS SYSTEM
The clean and filtered raw water (now referred to as feedwater) is supplied to the inlet of
the high pressure pump, P2. This pump raises feedwater pressure to 800 psi, the
nominal pressure required for optimal system recovery. The pressurized feedwater