Descaling of Multi Effect Distillation System and Pure Steam Generator

1.0 OBJECTIVE :

1.1 To lay down a procedure for Descaling of Multi Effect Distillation System and Pure Steam Generator .

2.0. SCOPE :

2.1 This procedure is applicable to Multi Effect Distillation System and Pure Steam Generator situated at Pharma Dekho.

3.0. RESPONSIBILITY :

3.1 Operator Engineering Department shall be responsible for Descaling of Multi Effect Distillation System and Pure Steam Generator and maintaining the record.
3.2 Officer/Executive Engineering Department shall be responsible for to verify the proper Descaling of Multi Effect Distillation System and Pure Steam Generator and to take corrective action if any operational deviation.

4.0. ACCOUNTABILITY :

4.1 Head Engineering Department shall be responsible for compliance of SOP.

5.0. PROCEDURE :

5.1 DE SCALING OF COLUMN
5.1.1. Before starting the process switch ‘OFF’ the main control panel of the MEDS and PSG.
5.1.2. Connect the feed water pump suction with the out let of the last column to chemical preparation Stainless Steel (SS) tank..
5.1.3. Add 6 kg sodium hydroxide flakes and 200 liter purified water in chemical tank. Mix the solution properly.
5.1.4. Re-circulate the solution through the columns for 2 hrs by switch ON the feed water pump.

5.1.5. After 2 hours switch ‘Off’ the pump. Drain the solution and flush the column with purified water for neutralizing the system. (Check the pH, it should be7-8).
5.1.6. After neutralization of column, add 30 kg citric acid and 200 liter purified water in chemical tank and mixes the solution properly.
5.1.7. Re-circulate the solution through the columns for 1hr by switch ‘On’ the feed water pump.
5.1.8. After one hour, mix 9 kg Ammonic Bifloride into the citric acid solution and continue the re circulation for another 2 hours.
5.1.9. After the 2 hour re circulation, mix 60 liters of Ammonia solution (commercial grade) and 1 liter Teepol into the citric acid Ammonic Bifloride solution. Continue the re circulation for 2 hours.

5.1.10. After 2 hours re circulation mix 1.5 kg of Sodium Nitrite into the above solution and re circulate for another one hour.
5.1.11. Switch ‘Off’ the feed pumps and drain the solution from the columns.
5.1.12. Flush the columns with purified water for 5-6 hours.
5.1.13. After flushing the columns, check the pH and conductivity. It should be same as feed water. Otherwise continue the flushing till achieved the pH and conductivity.
5.1.14. Reconnect the feed pump suction line and outlet line of the last column.

5.2. DESCALING OF TOP COOLER (CONDENSOR):
5.2.1 Connect the cooling water pump suction and out let of the top cooler to chemical preparation SS tank.
5.2.2 Add5 kg sulphamic acid (commercial grade) and 200-liter warm purified water in chemical tank. Mix the solution properly.
5.2.3 Circulate the solution through the top cooler for 2 hrs by switch ON the cooling water pump.
5.2.4 After 2 hours switch ‘Off’ the pump. Drain the solution and flush the top cooler with purified water for 4-5 hours.
5.2.5 After flushing check the pH and conductivity of the water. It should be same as feed purified water. Otherwise continue the flushing till achieved pH and conductivity.
5.2.6 Reconnect the feed pump suction line and outlet line of the top cooler.
5.2.7 Operate the plant as per SOP No.:
5.2.8 Record the De scaling of MEDS and PSG plant as per Annex –I.
5.2.9 De scaling of the Multi Effect Distillation System and Pure Steam Generator shall be carried out once a year.

6.0. ABBREVIATION :

Descaling of Multi Effect Distillation System and Pure Steam Generator

sop for Execution of Preventive Maintenance

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