USF RO ManualOMRX_6.pdf

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RX Manual 04/04 Rev. 6 OPERATING INSTRUCTIONS CAUTION A. Fill the tank on the cleaning skid with the appropriate quantity of RO product water or DI water. Do not use a solution of greater than 1.0% bisulfite. The pressure vessel endcaps will be damaged otherwise. B. Add the correct amount of sodium bisulfite powder to the cleaning tank using the following proportions: 0.5% solution sodium bisulfite - .042 lbs. per gallon 1.0% solution sodium bisulfite - .084 lbs. per gallon If applicable, add the appropriate amount of freeze protection (glycerin or propylene glycol) to the solution at this point. C. Once the bisulfite solution is thoroughly mixed, allow the solution to circulate through the RO unit for 30 minutes. D. Fully close the manual feed water isolation valve and install a Lock-Out device and a Lock-Out Tag on the valve. E. If applicable, you may also have to fully close any process valves located in the RO unit product line down stream of the product line to prevent unwanted RO product water from passing this point, and install a Lock-Out device and a Lock- Out Tag on the valve. F. Drain the pump and manifold piping. G. Seal all openings to prevent the membrane elements from drying out. H. Tag the RO unit with the date and type of solution the membranes are stored in so that it is properly flushed prior to being put back into service. The RO unit is now ready to be stored. Be sure to follow the Initial Startup in Section 3.2 when ready to put the unit back in service. USFilter 3-5
RX Manual 04/04 Rev. 6 SYSTEM MAINTENANCE 4.1 GENERAL 4.0 SYSTEM MAINTENANCE Routine customer maintenance procedures consist of daily checks of the system to record operating data, periodic replacement of the prefilter cartridge and sanitization and cleaning of the RO membranes. The prefilter cartridge should be changed monthly or when the differential pressure reaches 10-15 psig, whichever comes first. The RO membranes should be cleaned when the normalized product flow rate drops by more than 15% or the salt rejection drops by more than 3%. NOTE: Contact your local USFilter representative for assistance when the RO system requires cleaning. In addition, the system's external surface should be kept clean by occasionally wiping down all surfaces with a dust-free cloth and visually checking for cracked glass on gauges, loose fittings, and broken or missing hardware. Whenever the prefilter cartridge or RO membranes are replaced, inspect the serviceability of the o-ring seals prior to assembly. Inspect o-rings for signs of deterioration or cracking, and replace as required. It helps to lubricate o-rings with glycerin before re-assembly. 4.2 SANITIZING THE REVERSE OSMOSIS SYSTEM WARNING WARNING CAUTION Verify that the system is not in use and Tag Out all points of use during the sanitization process. Verify sanitant has been flushed from the system by testing to nondetectable levels at the RO outlet and all points of use before returning the system to normal operation. Chlorine is not compatible with thin film composite RO membranes, and must not be used to sanitize them. Periodically, the RO System may require sanitization in order to maintain the performance of the RO membranes, and to ensure a low bacterial count in the product water. How frequently the system is sanitized depends on the quality of the water needed for your particular application. Monitor bacterial levels in the feed and permeate as needed. When bacterial levels increase above an acceptable level for the application, sanitize the system. Sanitization may be required as often as once a week or as infrequently as every three months depending on local feed water and operating conditions. Sanitization is recommended once a month to maintain peak operating conditions. The choice of the sanitizing agent depends on its compatibility with the polyamide thin film composite RO membranes and system components, and the agent’s effectiveness as a sanitant. The most commonly used sanitants are hydrogen peroxide and peracetic acid. Formaldehyde can also be used as a sanitant however it is rarely used due to stringent OSHA exposure limits. USFilter 4-1
Page 1 and 2: USFilter 10 Technology Drive Lowell
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Page 5 and 6: TABLE OF CONTENTS SECTION DESCRIPTI
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Page 9 and 10: RX Manual 04/04 Rev. 6 INTRODUCTION
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Page 45: RX Manual 04/04 Rev. 6 APPENDIX 7.6

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