RO System Startup Checklist & Procedure

□ Corrosion resistant materials of construction are used for all equipment from the supply source to the membrane including piping, vessels, instruments and wetted parts of pumps

□ All piping and equipment is compatible with designed pressure

□ All piping and equipment is compatible with designed pH range (cleaning)

□ All piping and equipment is protected against galvanic corrosion

□ Media filters are backwashed and rinsed

□ New/clean cartridge filter is installed directly upstream of the high pressure pump

□ Feed line, including RO feed manifold, is purged and flushed, before pressure vessels are connected

□ Chemical addition points are properly located

□ Check/anti-siphon valves are properly installed in chemical addition lines

□ Provisions exist for proper mixing of chemicals in the feed stream

□ Dosage chemical tanks are filled with the right chemicals

□ Provisions exist for preventing the RO system from operating when the dosage pumps are shut down

□ Provisions exist for preventing the dosage pumps from operating when the RO system is shut down

□ If chlorine is used, provisions exist to ensure complete chlorine removal prior to the membranes

□ Planned instrumentation allows proper operation and monitoring of the pretreatment and RO system

□ Planned instrumentation is installed and operative

□ Instrument calibration is verified

□ Pressure relief protection is installed and correctly set

□ Provisions exist for preventing the permeate pressure from exceeding the feed/concentrate pressure more than 5 psi (0.3 bar) at any time

□ Interlocks, time delay relays and alarms are properly set

□ Provisions exist for sampling permeate from individual modules

□ Provisions exist for sampling raw water, feed, permeate and concentrate streams from each stage and the total plant permeate stream

□ Pressure vessels are properly piped both for operation and cleaning mode

□ Pressure vessels are secured to the rack or frame per manufacturer’s instructions

□ Precautions as given in Loading of Pressure Vessels (Section 4.1 & 4.2), are taken

□ Membranes are protected from temperature extremes (freezing, direct sunlight, heater exhaust, etc.)

□ Pumps are ready for operation: aligned, lubricated, proper rotation

□ Fittings are tight

□ Cleaning system is installed and operative

□ Permeate line is open

□ Permeate flow is directed to drain (In double-pass systems, provisions exist to flush first pass without permeate going through the second pass)

□ Reject flow control valve is in open position

□ Feed flow valve is throttled and/or pump bypass valve is partly open to limit feed flow to less than 50% of operating feed flow

Source: www.watertreatmentguide.com