USF RO ManualOMRX_6.pdf

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RX Manual 04/04 Rev. 6 SYSTEM MAINTENANCE softened filtered tap water. Completely flush the system between applications of different cleaning solutions. 3. Increase flow rates and decrease pressure. During cleaning, reject flow rates should be as high as possible without exceeding the maximum design flow of the system. The flow rate should be 8 - 12 gpm per vessel for the Med-RO series RO systems during cleaning. Pressure should be kept at a minimum during cleaning. Transmembrane pressure keeps foulants within or on the membrane surface during cleaning. The RO pump should be off during cleaning. 4. Optimum temperature during cleaning: The RO membrane cleaning solutions should be maintained at an elevated temperature if possible. Cold water reduces the effectiveness of the cleaning solution. Do not exceed the following temperatures during cleaning: C. Cleaning Instructions pH Range Maximum Cleaning Temperature 2-10 50°C (122°F) 1-11 35°C (95°F) 1-12 30°C (86°F) 1. Connect the RO system cleaning port (CP) connections to the accessory cleaning skid. Flexible hose and tubing work best to connect the cleaning equipment with the system. The materials of construction of the valves and hose must be compatible with the cleaning solutions. Verify that all piping connections are secure. 2. Mix the desired cleaning solution in the tank and warm to appropriate cleaning temperature. 3. Pump the mixed cleaning solution into the RO system at low pressure at the recommended flow rate of per vessel. The pressure should be low enough that essentially no permeate is produced. 4. Recirculate the cleaning solution through the RO system for 10 – 15 minutes. 5. Turn off the cleaning pump and allow the RO membranes to soak in the cleaning solution. The soak period may range from 1 hour to overnight, depending on how severely fouled the membranes are. Turn on the cleaning pump periodically to circulate the cleaning solution. If the cleaning solution becomes highly discolored during recirculation, discard it and repeat the application. USFilter 4-6
RX Manual 04/04 Rev. 6 SYSTEM MAINTENANCE 6. Recirculate the cleaning solution at 8-12 gpm per vessel for 30-60 minutes. This high flow rate flushes out foulants removed from the RO membranes. CAUTION If the system temperature approaches the maximum recommended operation temperature during recirculation, shut down the system and allow it to cool off before continuing the recirculation. 7. Disconnect the RO system from the cleaning skid. Divert the product and reject lines to drain. 8. Flush the cleaning solution from the system, starting with a 10 to 15 minute manual flush cycle. Then place the system in the normal operating mode, and for the first ten minutes, reduce the feed pressure to approximately half of the normal operating pressure by opening the reject and reject recycle throttle valves. This prevents residual foulants from being impacted into the membrane. After ten minutes, return the system to normal operating pressure, and continue flushing until the product water is clear of all residual cleaning agents. To test for residual cleaning agents when using an acid or base, the pH of the product water would be equal to, or nearly equal to, the pH of the feed water. For other chemicals, the conductivity of the product should be equal to, or less than, the conductivity of the product before cleaning. USFilter 4-7
Page 1 and 2: USFilter 10 Technology Drive Lowell
Page 3 and 4: applications. A warning alarm indic
Page 5 and 6: TABLE OF CONTENTS SECTION DESCRIPTI
Page 7 and 8: For Product and Service Information
Page 9 and 10: RX Manual 04/04 Rev. 6 INTRODUCTION
Page 11 and 12: RX Manual 04/04 Rev. 6 INTRODUCTION
Page 13 and 14: RX Manual 04/04 Rev. 6 SYSTEM INSTA
Page 15 and 16: RX Manual 04/04 Rev. 6 SYSTEM INSTA
Page 17 and 18: RX Manual 04/04 Rev. 6 OPERATING IN
Page 19 and 20: RX Manual 04/04 Rev. 6 OPERATING IN
Page 21 and 22: RX Manual 04/04 Rev. 6 SYSTEM MAINT
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Page 31 and 32: RX Manual 04/04 Rev. 6 TROUBLESHOOT
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Page 35 and 36: RX Manual 04/04 Rev. 6 WARRANTY 6.1
Page 37 and 38: RX Manual 04/04 Rev. 6 APPENDIX 7.1
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Page 41 and 42: RX Manual 04/04 Rev. 6 APPENDIX Cal
Page 43 and 44: RX Manual 04/04 Rev. 6 APPENDIX 7.4
Page 45: RX Manual 04/04 Rev. 6 APPENDIX 7.6

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