Title: Operation and Preventive Maintenance of Reverse Osmosis (RO) & (EDI) System_
- Objective:
To lay down procedure for Operation and Preventive Maintenance of Reverse Osmosis (RO) & Electro De-Ionizer (EDI) plant for generation of the purified water.
- Scope:
This SOP is applicable for Operation and Preventive Maintenance of Reverse Osmosis (RO) & Electro De-Ionizer (EDI) system located in the Purified Water Generation System.
- Responsibility:
Engineering Department: To follow the procedure for operation and preventive maintenance of the RO and EDI system.
Quality Assurance Department: To ensure compliance of the procedure for water system and to review and approve the procedure.
- Accountability:
Head Engineering and Head Quality Assurance Department
- Procedure:
5.1 Definitions:
Reverse Osmosis: Reverse Osmosis is a process in which external pressure is applied to reverse the natural flow of pure solvent (osmosis) through semi permeable membrane to get pure form of solvent (water).
Electro deionization: Electro deionization is a water treatment technology that utilizes electricity, ion exchange membranes and resin to deionised water and separate dissolved ions (impurities) from water.
Preventive Maintenance: Maintenance activity performed to ensure that the equipment will function smoothly and to avoid breakdowns.
Engineering Associate: Any personnel or operator of Engineering Department trained to perform duties as per this SOP.
5.2 Procedure:
| Operation of RO Plant | ||
| 5.2.1 | Before Starting of the RO Plant Ensure that:
1. Treatment of raw water using sodium hypochlorite solution in the sump complies with the given specifications, 2. Sufficient water is available in raw water storage tank (overhead tank), 3. Ensure sufficient quantity (about 20 litters) of Antiscalent solution i.e. Sodium Metabisulphite has been prepared (75 gm of sodium metabisulphite dissolved in 45 litres of purified water). |
|
| 5.2.2 | Open the raw water valve located outside the PW generation area which allows water flow from the overhead tank. | |
| 5.2.3 | Open the valve located after treated water motor by rotating the handle in anticlockwise direction and check that water is coming out from the RO system outlet. | |
| 5.2.4 | Put ON the Main Circuit Breaker located near the entrance of water system. | |
| 5.2.5 | Ensure that the valve located after high pressure pump is in open position by checking the red colour handle which should be downward. | |
| 5.2.6 | Put ON the Treated Raw Water Pump and check whether clear water is discharged from RO outlet. | |
| 5.2.7 | Ensure that the red, yellow and blue indicator are lit and working. | |
| 5.2.8 | Start the High Pressure Pump by pressing the green button on the RO panel. | |
| 5.2.9 | Check flow meter reading which should be between 225 to 275 litres per hour. | |
| 5.2.10 | Simultaneously check the Pressure Dial reading as following:
LEFT Pressure Gauge- for product water it should be at about 100 psi, RIGHT Pressure Gauge- for Raw water it should be at about 75 psi. |
|
| 5.2.11 | Switch ON the Antiscalent Electrical switch for sodium metbisulphite dosing. | |
| 5.2.12 | Next put ON the RO UV switch followed by stabilizer (indicates glowing of red colour indicator). | |
| 5.2.13 | Discharge the product water for 5 minutes and then connect the pipe to the RO Water Storage Tank. | |
| Operation of Electro Deionization (EDI) Plant | ||
| 5.2.14 | Ensure that the water level in RO Water Storage Tank is at least upto the level of stainless steel pipeline. | |
| 5.2.15 | Open the valve of RO Water Storage Tank located on the pipeline after RO Water Storage Tank. | |
| 5.2.16 | Switch ON the Conductivity Meter and UV lamp followed by stabilizer of EDI System (indicated by red colour indicator). | |
| 5.2.17 | Put ON the Starter of EDI motor by pressing green colour button on the panel to start the EDI plant. | |
| 5.2.18 | Simultaneously check for water coming out from the EDI outlet/discharge. | |
| 5.2.19 | Switch ON the EDI System Indicator Panel which indicates Ampere (output current) and Volt (output voltage). | |
| 5.2.20 | Check the flow rate of water in the flow meter and ensure that:
Flow rate of product water is in between 100 to 200 litres per hour (LPH) and flow rate of concentrated water is less than 5 litres per hour. |
|
| 5.2.21 | Check conductivity in the Conductivity Meter which should be less than 2.5
µS/cm. |
|
| 5.2.22 | Monitor the working of pressure gauges, flow meters conductivity, electrical indicators, ampere, voltage etc during operation of water system. | |
| Procedure for EDI shut down | ||
| 5.2.23 | Put OFF the starter of EDI motor. | |
| 5.2.24 | Put OFF the Conductivity Meter followed by UV Lamp. | |
| 5.2.25 | Turn OFF/close the valve of RO water storage tank. | |
| Procedure for EDI shut down | ||
| 5.2.26 | Putt OFF High Pressure Pump by pressing red button on RO panel. | |
| 5.2.27 | Put OFF the Antiscalent electrical switch. | |
| 5.2.28 | Put OFF UV followed by Treated Raw Water Pump. | |
| 5.2.29 | Finally switch OFF the main circuit breaker and close the raw water valve. | |
| Preventive Maintenance of RO and EDI | ||
| 5.2.30 | Perform the Preventive Maintenance as per Annexure. | |
| 5.2.31 | If Preventive Maintenance activity is outsourced, the observations are to be transcribed in the Annexure and external party certificate to be attached. | |
| Records | ||
| 5.2.32 | Record the details of RO and EDI operation in the format specified as per Annexure. | |
| 5.2.33 | Maintain the burning hours record of UV lamp as per Annexure. | |
- Abbreviation:
| Abbreviation | Expansion |
| SOP | Standard Operating Procedure |
| QA | Quality Assurance |
| HOD | Head of Department |
| EDI | Electro Deionization |
| RO | Reverse Osmosis |
| UV | Ultra Violet |
| psi | Pond per Square Inch |
| µS/cm | Micro Siemens per Centimetre |
| PW | Purified Water |
*Note – Ready to use SOP available in “DOWNLOAD” Section.