1500-6000 eng 2e15 ver 2 - s/v kewatitle microsoft word - 1500-6000 eng 2e15 ver 2.doc author thomas...

ENWA AB Backa Bergögata 13, SE-422 46 Hisings Backa

Tel. +46 (0)31-742 92 50, Fax. +46 (0)31-742 92 [email protected] - www.enwa.se

Operational Manual

Manual for the unit:

MT 1500

MT 1800

MT 2300

MT 3200

MT 4500

MT 5500

MT 6000

ENGLISH Version 041027

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CONTENTS

1. INTRODUCTION ........................................................... 2

2. DESCRIPTION OF PROCESS...................................... 3

3. SPECIFICATION ........................................................... 5

4. INSTALLATION FOR SPLIT MOUNTED UNIT ............. 6

5. INSTALLATION FOR RACK MOUNTED UNIT ............. 9

6. INITIAL START-UP PROCEDURE.............................. 11

7. NORMAL START-UP .................................................. 13

8. NORMAL STOP........................................................... 14

9. LONG TERM STOP..................................................... 15

10. GENERAL RUNNING AND OPERATION CONDITION18

11. R.O-MODULE FOULING............................................. 19

12. CHEMICAL CLEANING AGENTS ............................... 23

13. TROUBLE SHOOTING................................................ 26

14. MAINTENANCE............................................................27


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1. INTRODUCTION The Reverse Osmosis desalination unit described in this manual is one of a range of fresh water units available to produce potable water from brackish water or sea water with a TDS (salt content) up to 42.000 mg/l (4,2 %). To ensure proper operation, the unit has to be operated with feed water free from organic contamination such as oil, grease etc. The turbidity (suspended matter) of the feed water has to be lower than 0,5 NTU. Only open sea water is permitted, harbour water can contain up to 40 NTU suspended matter. If the unit is intended to be operated on feed water with a suspended matter higher than 0,5 NTU, or if oil, grease etc. is present an additional pre-treatment section is required. For information, please contact ENWA AB.


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2. DESCRIPTION OF PROCESS The treatment section is carried out in two stages: - Pre-treatment. - Desalination with Reverse Osmosis. PRE-TREATMENT: This stage of the process is designed to remove larger varieties of contaminants that would otherwise interfere with the short and long term performance of the reverse osmosis membranes. Feed water enters the unit through a mesh filter (not shown on the diagram). The mesh filter absorbs large particles that would plug feed pipes or cause damage to the pump. This filter will not be included the delivery from ENWA AB. Recommended mesh size is 0,5-2,5 mm. The mesh filter supplied has to be manufactured from a non-corrosive material. The feed water will then continue to the feed water pump which increases the feed water pressure to 1,5 - 2,5 bar, but can under some circumstances be higher or lower. A feed water valve (HV-2010) controls the feed water supply from the mesh filter and a check valve (CV-2010) will ensure that flushing water not will flow backwards through the feed water pump. The feed water will then continue to the feed water filter (F-2010) and you can see the pressure on the pressure indicator (PI-2011). The flush water filter (F-2020) contains an activated carbon cartridge, the purpose of the filter is to de-chlorinate the flushing water from the storage. These filters will absorb suspended matter larger than 10 micron size. DESALINATION WITH REVERSE OSMOSIS The feed water will then continue to the high-pressure pump (HPP-2010) that will increase the feed water pressure to normal operation pressure (See general operation conditions). After the high pressure pump the feed water continues to the R.O-module (RO-2030, eventually -31, -32, -33, -34) that desalinates the water. Two streams will pass out from the module; one is product and the other one is brine (salt concentrate). The brine will continue to the pressure regulating valve (PCV-2050) which by opening or closing will decrease respectively increase the operation pressure. Actual operational pressure is shown on the pressure indicator (PI-2050) upstream the R.O-module. The brine will then continue to sea as waste. The product from the R.O-module will pass through a conductivity-cell that measures the conductivity in the product water. The conductivity meter (1u400) will influence the solenoid valve (ROV-2060) that divides the product water to tank or waste. If the


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conductivity is below the limit, the product will go to tank and if the conductivity is above the limit, the product will go to waste. When the conductivity meter is in ”OFF” position the product water will go to waste. The product flow will be measured by a flow-meter (FI-2060).


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3. SPECIFICATION FEED WATER: Clean sea water, approx. 10-15 litres/min. VOLTAGE PHASE FREQUENCY POWER FP POWER HP 115 VAC 1-phase 60 Hz 0.55 kW 1.1 kW 230 VAC 1-phase 50 Hz 0.55 kW 1.5 kW 400 VAC 3-phase 50 Hz 0.55 kW 1.5 kW * 440 VAC 3-phase 60 Hz 0.55 kW 1.8 kW *MT 6000 2.2 kW WATER CONNECTIONS: SPLIT MOUNTED: Inlet feed water CN-2010 20 mm Hose nipple. Inlet flush water CN-2020 3/8” Plastic tube. Outlet product CN-2060 3/8” Plastic tube. Outlet product to waste CN-2050 3/8” Plastic tube. Outlet brine to waste CN-2050 3/8” Plastic tube. RACK MOUNTED: Inlet feed water CN-2010 3/8”R Inside. Inlet flush water CN-2020 3/8”R Inside. Outlet product CN-2060 3/8”R Inside. Outlet waste CN-2050 3/8”R Inside WATER PRESSURE: Feed water Min. 1,5 bar. Max. 4,0 bar. Flush water Min. 2,0 bar. Max. 4,0 bar. Product water Max. back pressure 2,5 bar. FEED WATER TEMPERATURE: Design 25° C. Min. 0° C. Max. 45° C.


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4. INSTALLATION FOR SPLIT MOUNTED UNIT The pump module and R.O-module may be mounted next to each other, or separately as desired. FEEDWATER PUMP (FP-1010, Option) Mount the pump below sea level. A washable mesh filter should be connected in the suction side of the pump. The fittings and hose must be of non-corrosive material. (A plastic hose with stainless hose clamps is suitable). FILTER MODULE (Flush water filter, Feed water filter) The filter bracket must be secured attached to a rigid surface. Be sure to allow space for filter air venting and cartridge replacement. Also note that the flush water filter has to be connected to the existing fresh water system and a carbon cartridge filter must be used in the filter. PUMP MODULE (HPP-2010) When the high-pressure pump (HPP-2010) is driven by an electric motor there must be sufficiently ventilation in order to transfer the waste heat from the electric motor. The pump module must be mounted horizontally upon a rigid base. To avoid vibrations, rubber mounting shall be used between base plate and the rigid base. There should be ample room around the unit for its operation and for the following maintenance: 1 - Valve- and sealing changes, and also belt changes (when V-belting). 2 - Oil change. 3 - Pump service. 4 - Electrical hook-up.


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R.O-MODULE (RO-2030 eventually -31, -32, -33, -34) The R.O-module can be bolted or screwed to a horizontal or vertical surface. The location chosen should: 1 - At no time have a surrounding temperature exceeding 45° C. 2 - Have adequate space around for operation and maintenance such as adjustment of working pressure and safety relief valve. 3 - Not be mounted where unforeseen leakage can cause damage. PRODUCT FLOW METER (FI-2060, option) Shall be mounted vertically according to the flow diagram. HOSE CONNECTIONS To connect all items to each other, see process and connection diagram. BRINE OUTLET TO WASTE The brine outlet must be led off above the sea level. PRODUCT WATER TO TANK The product from the unit must be led to the fresh water storage tank. PRODUCT WATER TO WASTE The product to waste shall be located so that no seawater or other contaminated water can flow backwards after shut down of the unit. When the unit is stopped air will flow backwards into the R.O-modules to prevent vacuum in the system. NOTE! Do not close the valve if installed on the pipe to tank or waste. If the unit is operated against a closed pipe the pressure will increase until the pipes of the system breaks. FLUSH WATER When the unit is stopped fresh water has to flush the system clean from seawater. Connect a pipe (hose) from the fresh water pressure system (cold water) to the flush water valve upstream the flush water filter.


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CONDUCTIVITY CELL (1u400) AND 3-WAY SOLENOID VALVE (ROV-2060) Shall be mounted within reach for service and manual activation on a rigid surface with the 3-way solenoid valve above the cell. ELECTRIC CONTROL UNIT All electrical control units shall be mounted on a rigid surface. Allow space for operation. ELECTRICAL CONNECTIONS To connect all electrical items, see process and connection diagram as well as electrical diagram. NOTE! Mount an operate/safety switch for the electrical connections to the unit.


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5. INSTALLATION FOR RACK MOUNTED UNIT DESALINATION UNIT The desalination unit must be bolted horizontally where the location chosen should: 1. At no time have a surrounding temperature exceeding 45° C. 2. Have adequate space around for operation and maintenance. 3. Not be mounted where unforeseen leakage can cause damage. NOTE! Lift the unit/parts in the steel frames or consoles. FEEDWATER PUMP (FP-1010, option) Mount the pump below sea level. The suction or inlet side of the pump should be connected to a washable mesh filter. The fittings and hose must be of non-corrosive material (a plastic hose with stainless hose clamps is suitable). PRODUCT WATER TO TANK (CN-2060) The product from the unit must be led to the fresh water storage tank. BRINE AND PRODUCT WATER TO WASTE (CN-2050) The brine/product to waste shall be located so that no seawater or other contaminated water can flow backwards after shut down of the unit. When the unit is stopped, air will flow backwards into the R.O-modules to prevent vacuum in the system. NOTE! Do not close the valve if installed on the pipe to tank or waste. If the unit is operated against a closed pipe the pressure will increase until the pipes of the system breaks. FLUSH WATER (CN-2020) When the unit is stopped fresh water has to be used to flush the system clean from seawater. Connect a pipe (hose) from the fresh water pressure system (cold water) to the flush water connection. NOTE! A carbon cartridge filter must be mounted in the flush water filter.


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ELECTRICAL CONNECTIONS To connect all electrical items, see process and connection diagram as well as electrical diagram. NOTE! Mount an operate/safety switch for the electrical connections to the unit.


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6. INITIAL START-UP PROCEDURE Carry out the following steps the first time the fresh water unit is to be operated, or after a prolonged shut down.

1. Check the oil level on the high-pressure pump (HPP-2010). Check that the cartridge filters (F-2010, -2020) are properly installed.

2. Check the position on the following valves:

• Manual flush water valve (HV-2020) open

• Pressure regulating valve (PCV-2050) open

• Bottom valve sea water intake open

• Brine outlet, (if installed) open

• Product to waste, (if installed) open

• Tank valve, (if installed) open

3.

• Open the feedwater valve (HV-2010).

• Start the feedwater pump (FP-1010) by the switch marked ”SYSTEM”.

• Start the high-pressure pump (HPP-2010) by turning the switch marked

”HP PUMP” into position ”AUTO”. NOTE! If feedwater pressure decreases to less than 0,5 bar, the unit will stop by the low pressure switch (PLCO-2010).

4. Stop the conductivity meter (1u400) by turning the switch marked ”SALINITY” to “OFF” position. The product will then automatically go to waste since the ROV-2060 is no activated.

5. Wait until the system is filled by feed water and becomes stabilised. Adjust the operate pressure as recommended in ”GENERAL RUNNING AND OPERATION” by turning the valve knob on the pressure regulating valve (PCV-2050) slowly clockwise.

6. Operate the unit in this position (product water to waste) at least one hour. This procedure flushes the unit free from chemicals etc. Check for leaks at the same time.


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7. Start the conductivity meter (1u400) by turning the switch marked

“SALINITY” to position “ON”. When the conductivity is below 1200 µS/cm the product will automatically go to tank (ROV-2060 will be activated.

8. For shut down, see ”NORMAL STOP”. NOTE! For initial start-up after a prolonged shutdown, or after any chemical treatment, the unit must be started according to the instructions in ”INITIAL START-UP PROCEDURE”.


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7. NORMAL START-UP After the unit has been initially started and flushed, the subsequent steps are to be made:

• Check that the flush water valve (HV-2020) is open.

• Open the feedwater valve (HV-2010).

• Start the feedwater pump (FP-1010) by the switch marked ”SYSTEM”.

• Start the high pressure pump (HPP-2010) by turning the switch marked ”HP PUMP” into position ”AUTO”.

NOTE! If feedwater pressure decreases to less than 0,5 bar the unit will stop by the low pressure switch (PLCO-2010). Adjust the operate pressure as recommended in ”GENERAL RUNNING AND OPERATION”. NOTE! If the unit has been shut down for more than two days, run the first amount of product water to waste for at least 15 minutes. Close the conductivity meter (1u400) by turning the switch marked “SALINITY” to “OFF” position. The product will then automatically go to waste since the ROV-2060 is not activated.


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8. NORMAL STOP

To shut down the unit, proceed as follows:

• Turn the switch marked ”HP PUMP” to ”OFF” position

• Turn the switch marked ”SYSTEM” to ”OFF” position.

• The flush water valve (ROV-2020) opens automatically for appr. 10-15 min. (The flush water valve closes automatically).

NOTE! If it is desired to shut down the desalination unit for less than one (1) week, the above steps are all that is required. However, if the desalination unit is to be shut down for over one week, it should be flushed weekly as above. Or if the unit is equiped with automatic flushing it will flush automatically at 100 hours shutdown. (preset from factory) SHUT-DOWN FOR A LONG PERIOD If the unit is to be shut down for a considerable length of time, over one (1) week, or when the automatic flush system is not in operation, it should be preserved to prevent bacterial or marine growth. Follow the procedure given under the section ”LONG TERM STOP”.


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9. LONG TERM STOP The R.O-module should be preserved with MT-5 solution when it is intended to shut down the desalination unit for a long period, or when it not can be flushed regularly every week. We have cleaning equipment as extra equipment, alternative you can use a portable cleaning tank and plastic hoses. 1. Shut down the unit as described under “NORMAL STOP”.

2. Loose the product water connection (product hose) to tank (CN-2060). NOTE! Do not remount the product hose to tank during the whole preservation.

Connect another plastic hose and connect the other end of the hose to a 40 litres cleaning tank (plastic bin).

On units with chemical cleaning equipment you turn the 3-way valve for the product water (CCV-2060) in position open to the cleaning tank for chemical cleaning.

3. Start the unit as described under ”NORMAL START” and produce 40 litres of product water in the plastic bin. Stop the unit. 4. Close the conductivity meter (1u400) by turning the switch marked “SALINITY”

in position “OFF”. The product will then automatically go to waste since ROV-2060 are not activated

NOTE! Units equipped with optionally conductivity meter, will route the product flow to waste, when turning the switch marked ”SALINITY” to ”OFF” position. 5. Pour one plastic bottle of MT-5 solution into the plastic bin containing 40 litres of product water. Mix with a clean stick. 6. Close the manual flush water valve (HV-2020). 7. Close the bottom valve upstream mesh filter. 8. Loose the plugged connection CN-2015) and connect a plastic hose and lead the

other end of the hose to the cleaning tank that now contains 40 litres of preservation solution.

On units with chemical cleaning equipment you will turn the 3-way valve for the feed water (CCV-2055) to position open to cleaning tank for chemical cleaning. 9. Check that the feedwater valve (HV-2010) is closed. On units with chemical cleaning equipment, the feed water valve (HV-2010) must be open. 10. Open the pressure-regulating valve (PCV-2050) fully.


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11. Do not start the feedwater pump.


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12. Start the high-pressure pump (HPP-2010) in position “MAN”. NOTE! The pump will throb until the flow-and-pressure in the system becomes stabilised. 14. Do not flush the system after preservation. (The preservation solution will be flushed away in that case). 15. Reconnect the feedwater connection (CN-2010). 16. Switch the main power switch to ”OFF” position. NOTE 1: To provide protection against freeze damage, disconnect the R.O module and store it in an ambient temp. between 0-35 C, and also free drain pumps and pipes from water. NOTE 2: When the unit is to be restarted, follow the steps under ”INITIAL START-UP”. NOTE 3: Maximum allowed preservation time with MT-5 is 1 year. If the unit has the intention to be shut down for a longer period than 1 year, the unit must be preserved again as above. WARNING 1 The use of chlorine or quaternary ammonium chloride types of conservation solution is prohibited. The use of such chemical agents will cause irreparable loss of productivity and gradual deterioration of the R.O module. WARNING 2 The chemical liquid compound MT-5 must be handled with extreme care. It causes irritation of skin, eyes, nose and throat. Avoid prolonged or repeated contact with any part of the body. Do not inhale. Always use with adequate ventilation. If it comes in contact with the skin or eyes, immediately rinse the affected parts liberally with water for at least 15 min., and in case of the eyes, immediately seek medical aid.


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10. GENERAL RUNNING AND OPERATION CONDITION Maximum feed water temperature is 45° C. Maximum feed water salt content 42000 mg/l (4.2%, approx. 60000 µS/cm) (If the feed water salt content is more than 35000 mg/l the salt content in the product water can be a little bit more than 500 mg/l, WHO’s recommendation) Maximum operate pressure is:

115 VAC units 60 bar All other units 65 bar

Normal operate pressure is 40-65 bar (40-60 bar in 115 VAC units) and depends on the salt content and temperature in the feed water. Maximum product flow depends on the type of unit as below. Normal product flow depends on: a. Type of unit b. Feed water temperature c. Salt content in the feed water Low temperature and/or high salt content in the feedwater will decrease the product water flow as below.

MT 1500 MT-2300 MT 1800 MT 3200 MT4500 MT 5500 MT 6000 Max. Flow l/h

60 95 75 135 185 225 250

Normal Flow l/h T=25°C

60

95

75

135

185

225

250


45

75

58

104

150

185

205


29

54

41

75

110

145

160

The table is based on 30000 mg/l (3.0%, 45000 µS/cm) salt content in the feed water.


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11. R.O-MODULE FOULING Is a complex phenomenon which involves trapping material in the fibre bundle or on the surface of the membrane inside the R.O. module. When a R.O module fouls, the salt concentration of the product water usually increases. The conductivity meter shows higher conductivity. When it has reached an unacceptable level is it time for chemical treatment. The following foulings are the most common: - Scaling - Metal oxides - Particulate matter - Colloids - Biological matter - Hydrolyse by chlorine SCALING Scaling is caused by the precipitation of sparingly soluble salts as CaCO3 and CaSO4 in the R.O-module. This phenomenon will happen, when the feedwater flow is too low compared to the product water flow, and can be determined by measuring the brine flow from the unit. The brine flow should exceed 8 litres/min. The reason when the feedwater flow is to low is loose V-belt on the high-pressure pump. See Belt Tensioning. The reason can also be a fouled pump valve. See high-pressure pump in the component data sheet section. METAL OXIDES Fouling with metal oxides is caused by the formation of the oxide and/or the hydroxide of iron, manganese or aluminium, but iron is the most common. Iron fouling can be avoided by selecting the best non corrosive material on the feedwater side of the unit. Also product storage and distribution system has to be of a non corrosive material to avoid iron oxide entering the unit during flushing, after the unit has been stopped. Fouling by metal oxides is identified by rapid conductivity increasing (within 24 hours) to a level of full scale on the meter.


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PARTICULATE MATTER Device plugging is caused by the mechanical filtration of particulate matter. That is too large to pass through the feed - brine passage. The average spacing in the membranes is about 20 microns. As a general rule, if a particle is less than about 10 microns, it should be able to pass through a 20 microns passage. To avoid particulate plugging, be sure that right micro cartridge is used (5 or 10 micron) and is properly installed. COLLOIDS Colloidal fouling is caused by the coagulation of colloids in the R.O-module during the reverse osmosis process. Colloids are very small particles usually ranging from 0,3 to 1,0 micron in size. To avoid colloidal fouling do not operate the unit in harbours and water which is polluted. If the unit is intended to be operated in such water, an extended pre-treatment section is required. Contact ENWA AB. Colloidal fouling is identified by conductivity increasing over several weeks. BIOLOGICAL MATTER Biological fouling can occur when the feedwater contains sufficient nutrients to sustain rapid growth of organisms inside the R.O.module. This growth can lead to deposition of slimes, causing R.O. module fouling and poor performance. To avoid biological fouling do not operate the unit in water which is strongly contaminated with bacteria. Such as harbour water etc. If the unit is intended to be operated in such water, please contact ENWA AB, so that a suitable pre-treatment section can be designed. Bacterial fouling is identified by conductivity increasing after an extended shut down without MT-5 protection. HYDROLYSE BY CHLORINE If the unit is operated with water containing chlorine, a carbon filter has to be used as a pre-treatment. Chlorine, even in very week concentration will cause damage to the R.O. module. Flushing water from the storage onboard can, under some circumstances contain chlorine e.g. when the water tanks have been filled up with water shore which contains chlorine. It is of highest importance that the carbon cartridge is properly installed in the filter house for flush water and has not been replaced by a normal cartridge filter. Normal seawater does not contain any chlorine.


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CHEMICAL CLEANING PROCEDURES Reverse Osmosis, like most other water treatment equipment, occasionally needs cleaning. As a separate item a cleaning tank is required. The tank can be a plastic bin containing a volume of 40 litres. Some plastic hoses are also required. CHEMICAL TREATMENT 1. Shut down the unit as described under ”NORMAL STOP”. 2. Disconnect the product water connection to tank (CN-2060). NOTE! The connection to the tank is not allowed to be reconnected during the whole cleaning procedure. Connect another plastic hose and insert its other end into a cleaning tank of 40 litres volume (plastic bin). On units with chemical cleaning equipment turn the product water cleaning 3-ways valve (CCV-2060) in position to cleaning tank. 3. Start the unit as described in ”NORMAL START” and let 40 litres of product water be produced in the cleaning tank. Stop the unit as described in ”NORMAL STOP”. 4. Close the bottom valve upstream mesh filter (if installed). 5. Disconnect the plugged connection (CN-2015) and connect a plastic hose and insert its other end into the cleaning tank containing the 40 litres of product water. On units with chemical cleaning equipment turn the feed water cleaning 3-valve (CCV-2055) in position to cleaning tank. 6. Disconnect the brine water connection (CN-2050) and connect another plastic hose and insert its other end into the cleaning tank containing 40 litres of product water. In units with chemical cleaning equipment turn the brine water cleaning 3-valve (CCV-2050) in position to cleaning tank. 7. Prepare the chemical treatment solution to be used. See ”CHEMICAL CLEANING AGENTS”. 8. Close the flush water valve (HV-2020). 9. Close the feedwater valve (HV-2010). On units with chemical cleaning equipment the feed-water valve (HV-2010) must be open. 10. Open the pressure-regulating valve (PCV-2050) fully. 11. Do not start the feedwater pump.


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12. Start the high-pressure pump (HPP-2010) with “MAN” position NOTE! The pump will throb until the flow and pressure in the system becomes stabilised. 13. Re-circulate the cleaning solution at least one hour. The temperature of the cleaning solution must not exceed 40° C, if it should happens, stop the high pressure pump and allow the solution to cool. 14. Stop the high-pressure pump (HPP-2010). 15. Flush the unit at least 15 min. with feed or fresh water. For flushing with feedwater run the unit with fully open pressure regulating valve and product water valve open to waste. For flushing with freshwater open the flush water valve and keep the product water valve open to waste. 16. Continue with the next type of cleaning or if the unit is intended to be in service, reconnect all service hoses and start the unit as described in ”INITIAL START-UP PROCEDURE”. WARNING ! For initial start-up after a prolonged shut-down, or after any chemical treatment, allow the product water to flow to waste for at least 1 hour, by turning on the product water 3-way valve to waste. If the cleaning procedure has no effect, disconnect the R.O-module and send it to ENWA AB, for cleaning.


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12. CHEMICAL CLEANING AGENTS When using any of the chemicals mentioned, follow accepted safety practice. When preparing chemical solutions for cleaning, be certain that all chemicals are dissolved and well mixed before introducing them into the R.O. unit. During re-circulation, temperatures must not exceed 40° C. All chemicals to be used for cleaning and treatment, must be handled with extreme care. They cause irritation of skin, eyes, nose and throat. Avoid prolonged or repeated contact with any part of the body. Do not inhale. Always use with adequate ventilation. In case it comes in contact with the skin or eyes immediately rinse the affected parts liberally with water, and in case of the eyes seek medical aid. The fresh water to be used for the chemical treatment has to be free from chlorine. Normal tap water has to be de-chlorinated by a carbon filter. Product water from the unit can be used direct. Use gloves and protection glasses. MT-10 CHEMICAL CLEANING Shall be used as a general cleaning procedure when the product flow has decreased with 10-15 % below rated flow or the conductivity has increased to 1200 µS/cm. On units equipped with conductivity control/alarm, the alarm will be released at 1200 µS/cm. The MT-10 shall also be used as an ”pre-cleaning” before a sterilisation with MT-5 solution is done. Preparing MT-10 Add one plastic bottle of MT-10 into the 40 litres cleaning tank containing product water. Mix well. Re-circulation time MT-10 1 hour. Best temperature for treatment is 30-35° C. Lowest allowed temperature is 25° C. Highest allowed temperature is 40° C. Flush the unit free from cleaning solution during 15 min. with flush water. If the unit is intended to be in service you must proceed as described in ”INITIAL START-UP PROCEDURE”. If the unit is not intended to be in service it must be preserved as described in ”MT-5 PRESERVATION”.


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MT-10 + MT-5 STERILISATION Sterilisation has to be done when the content of bacteria is too high, which you recognise on a bad taste of the water. Pretreat the unit with MT-10 as described in ”MT-10 CHEMICAL CLEANING”. Flush for at least 15 minutes. After that you are going to treat the unit as described in ”Preparing MT-5 Sterilisation”. Prepare MT-5 Sterilisation Mix one plastic bottles of MT-5 into the 40 litres cleaning tank containing product water. Mix well. Re-circulation time MT-5 Sterilisation 1 hour. If the unit is intended to be in service you must proceed as described in ”INITIAL START-UP PROCEDURE”. If the unit is intended to be stored you must leave it with the MT-5 solution. Do not flush the unit then. MT-5 PRESERVATION This solution shall be used when the unit will be out of service for more then 1 week and you are not intended to flush it every week. Prepare MT-5 Preservation Add one plastic bottle of MT-5 to the 40 litres cleaning tank containing product water. Mix well. NOTE 1:The MT-5 solution must be in the unit during the preservation time (max. 1 year) so you must not flush it after preservation. When the unit is intended to be in service again you must proceed as described in ”INITIAL START-UP PROCEDURE”. NOTE 2:The unit is now preserved with MT-5 solution for 1 year. If the unit will be stopped more than 1 year it must be re-preserved.


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MT-20 CHEMICAL CLEANING To be used when scaling or metal-oxides have caused fouling. Preparing MT-20 Add one plastic bottle of MT-20 into the 40 litres cleaning tank containing product water. Mix well. Re-circulation time MT-20 1 hour. Best temperature for treatment is 35° C. Lowest allowed temperature is 25° C. Highest allowed temperature is 40° C. If the unit is intended to be in service you must flush the unit with flush water during 15 minutes. Proceed with the ”INITIAL START-UP PROCEDURE”. If the unit is intended to be shut down for a long period, flush it as above and then prepare it as described in ”LONG TERM STOP”.


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13. TROUBLE SHOOTING LOW FEEDWATER PRESSURE 1. Change the feedwater filter. 2. Clean the mesh filter. =============================================================== OPERATION PRESSURE INDICATES ZERO EVEN WHEN THE PRESSURE REGULATING VALVE (PCV-2050) IS ALMOST CLOSED. 1. Check high pressure pump belt tensioning (when V-belting). 2. Check the high pressure pump valves, repair if required. 3. Check the high pressure pump sealing, repair if required. =============================================================== HIGH PRESSURE PUMP (HPP-2010) WILL NOT START. 1. Check the current and power. =============================================================== HIGH PRESSURE PUMP STARTS, BUT STOPS AFTER 1-30 MINUTES. 1. The power overload has stopped the pump. Check the current. Check the air ventilation around the electric motor. =============================================================== PRODUCT FLOW HAS DECREASED BY MORE THAN 10-15 %. 1. Clean the unit as described in ”CHEMICAL CLEANINGS PROCEDURES”. =============================================================== ALARM AT HIGH CONDUCTIVITY (OPTION) 1. Clean the R.O-module see ”CHEMICAL CLEANING AGENTS”. NOTE! It is normal that the product goes to waste the first 20 minutes after start, due to high conductivity.


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14. MAINTENANCE - FEED WATER FILTER CHANGE The feedwater filter should be changed when it looks really soiled or when the feed pressure is less than - 0,5 bar. If the O-ring leaks, disconnect the filter house, check that the O-ring is properly installed, coat it slightly with Vaseline. - FLUSH WATER FILTER CHANGE This carbon filter is used to de-chlorinate the fresh water to the R.O module and should be replaced with a new carbon cartridge once a year. NOTE! Use only feed water filter and flush water filter recommended by ENWA AB. Erroneous choice of filter can damage the unit. - HIGH PRESSURE PUMP LUBRICATION Change the oil in the pump after the first 100 hours of operation, and then after every 1000 hours of operation. Remove the drain plug and drain the contents. Refill with SAE 40 weight motor oil with antiwear and rust inhibitor. - BELT TENSIONING (when V-belting) Adjust the V-belt to the greatest tension that will allow a belt movement of 1 cm when pushed lightly at mid-span by the hand with about 2 kg force. To adjust the belt tension, sufficiently loosen the four base-plate bolts of the motor, and then adjust the belt tension by turning the two small nuts located at the motor end of the pump base plate. Then retighten the four motor bolts. - HIGH PRESSURE PUMP REPAIRS Refer to the manufacturer's operation instructions in the Component Data section of this Manual. - CONTROL OF THE SAFETY VALVE (PSV-2050) Control the opening pressure of the safety valve (PSV-2050) once a year. The valve will open at appr. 75 bar. Adjust the operation pressure temporarily with the pressure regulating valve (PCV-2050) to appr. 75 bar, adjust the opening pressure if the valve has not open at 75 bar. NOTE! Return to normal operation pressure directly after the control.

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