How to change membrane in the Commercial RO plant?

It may be essential to change the reverse osmosis membrane on occasions. This can be identified after troubleshooting and other corrective steps have been taken.

RO-membranes, the reverse osmosis system should be turned off and emptied in the same way that O-Rings should be replaced. The new element serial numbers should be noted prior to installation, along with their intended system position. When comparing the membrane manufacturer's test data to the real system performance, this is helpful.

Both of the vessel's end-caps may need to be removed. After that, the pieces may be removed in their regular flow direction. Their brine seals will not jam against the pressure vessel as a result of this. The replacement components can be placed into the vessel's feed end and utilized to push through the other parts.

To ease fitting, lightly lubricate the U-Cup brine seals and the inter-connector O-Rings with glycerin. O-Rings should be put on each interconnector. Only the open groove of U-cup brine seals should face the upstream end of each element when installing them (you should also take note of the flow arrow on the side element which points toward the downstream end). Brine seals should never be used on both ends of an element.

Any gaps between elements should be filled with shims once they've been replaced. After that, the end caps may be placed and the reverse osmosis system can be turned on. Before initiating the high-pressure pump, the system should be filled with low-pressure water. To eliminate any remaining preservation chemicals, any new elements should be washed to drain. After the plant's performance has stabilized, system operational data should be gathered (this is normally within 24 hours).

Stepwise replacement of RO Membrane

Step 1: Turn off the reverse osmosis system's feed water supply line valve.

Step 2: Turn off the reverse osmosis storage tank's ball valve. Turn the blue ball valve on top of the tank a quarter, turn clockwise to achieve this.

Step 3: Let the pressure in the system flow off by opening the RO faucet.

Step 4: Place a shallow tray or pan under the filter housing to catch any spilled water during the membrane replacement operation.

Step 5: Push down on the little ring where the tubing attaches to the cap to disconnect tubing from membrane housing cap (usually on the right-hand side of the housing). Pull the tube out while pressing and holding the ring down.

Step 6: Remove the RO membrane by unscrewing the membrane housing cap. It's common for the membrane to have been there for 1-3 years and to be tough to remove. To remove this, needle-nose pliers may be required.

Step 7: Place the replacement membrane in the housing first, with the O-ring end towards the open cap and the big outer rubber stopper closest to it. Insert the membrane until the O-rings are securely seated in the membrane housing. To centre the membrane and ensure that it is well installed, you may need to move it in a tiny circular motion and provide some excellent pressure. Untreated water will flow freely through the system if the membrane is not correctly placed.

Step 8: Replace the membrane housing cap and tighten it. Reattach the tubing to the fittings that were removed. In order to ensure that tubing is correctly secured, insert it as far as possible into the appropriate fitting, then pull lightly on it to lock it in place.

Step 9:  If the tubing on the other end of the membrane housing cover was removed, replace each tube in its proper placement.

Technical assistance and guidance

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