Nobel RO 406 /E Installation Operation & Maintenance
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REVERSE OSMOSIS SYSTEMS RO 4... /E /EL - INSTRUCTIONS MANUALs.r.l.Milano - ITALY Page 20 of 25 ro4e_mi-r10.doc - r. 107. MaintenanceRefer to special manuals of each components for maintenance operations.7.1. Periodical monitoringThe system requires, as periodical maintenance, the cleaning or replacing of the cartridge offilters .Special instructions :• check daily the values of pressure and flow rate of the water; they have to comply withones stated by the manufacturer.• be sure of chlorine content in raw water : it is STRICTLY required that the contents ofchlorine in raw water must be lower than 0.1 ppm; higher quantity can seriously damagethe membrane.• replace the 5 μm filtering cartridges of the filter F, at least every six months, according tothe quality of raw water or when the inlet pressure decreases (compare pressure gaugesM1 and M2, max allowable pressure drop though the filter is 0.8 bar - 80 kPa). Before theopening of the filter, switch OFF the main power, and close the inlet shut off ball valve V1;for refills see the attached special instructions of the filters.• replace the RO membranes, when the quality and/or quantity of treated water (permeate)are not satisfactory any more. Whether the raw water is adequately pre-treated the life ofmembranes is usually longer than 3 years (even 5-6 years). Therefore, the life ofmembranes depends on the quality of water to be processed.To re-start the system after the replacement of filters and/or membranes, follow thedirections described at chapter "Starting-up and adjustments”.7.2. Non-working period• Whether a shut-off of the system, longer than one week is expected, it is suggested to fillthe membranes with a preservative solution containing 1% of sodium bisulphite (NaHSO 3)in RO treated water.The preservative is injected into the membranes using an auxiliary tank, the same waydescribed for the cleaning, but without rinse. The solution is simply drawn by the high-pressure pump P.At the re-starting of the system it is required to remove the preservative fromthe membranes, the same way described at chapter “Starting-up &adjustment". |
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