OPERATING PROCEDURE FOR MULTICOLUMN DISTILLATION STILL

1.0 AIM
To lay down a standard operating and cleaning procedure for Multicolumn distillation still.

2.0 SCOPE
Maintenance Department

3.0 AREA OF OPERATION
Multiple column and surrounding area.

4.0 RESPONSIBILITY
Operator/Maintenance Supervisor concerned.

5.0 ACCOUNTABILITY
Maintenance Head.

6.0 PRE-START UP

6.1 Check the cleanliness of still.

6.2 Check dry saturated steam supply after PRV it should be 4.8 to 6 Kg/Cm_2_.

6.3 Check the conductivity of D.M. Water and it's supply.

6.4 Compressed air supply should be 6 Kg/Cm_2_.

6.5 Check the cooling water supply; and it's pressure should be 1 to 1.8 Kg/Cm_2_.

6.6 Check the emergency stop button is in released position.

7.0 START UP

7.1 Keep the main switch ON position.

7.2 Keep the control on rotary switch in ON position.

7.3 Set high and low steam temperature limits on Temp. Indicator Controller

7.4 Set high and low distilled water temperature limits on Temp. Indicator Controller.

7.5 Set conductivity limits of inlet D. M. Water and outlet distilled water in conductivity meter.

7.5 Drain & close valves of 1st, 2nd and 3rd column.

7.6 Press start push button.

8.0 OPERATIONS

8.1 Metering pump and feed water inlet valve to be ON.

a) D.M. Water will fed to 1st column through cooler.

b) Water level of 1st column increases upto outlet of 1st column. When it reaches to float switch level; the D.M. Water inlet valve close and metering 3rd pump will stop. Water enters to 2nd column theree. Overflow of 1st column filled by water there. Overflow of 2nd column; like wise all 4 column filled & 4th column overflow collected as distilled water.

8.2 Open the steam inlet valve then steam enter into heat exchanger of 1st column. This will up the water in 1st column & converts it into steam.

8.3 Drain the condensates & Plant steam through steam trap.

8.4 The water level of 1st column drops below float switch level hence pump starts again & D. M. Water fed into 1st column.

8.5 Steam produced in 1st column then enters to heat exchanger of 2nd column & it converts D. M. Water of 2nd column into steam form. Condensate of 2nd column is collected in cooler.

8.6 Steam produced in 2nd column enters to heat exchanger of 3rd column; that converts D. M. of 3rd column into steam form condensor of 3rd is collected in the cooler.
8.7 Steam produced in 3rd column enters to heat exchanger of 4th column which converts D. M. Water of 4th column into steam form. The condensate of 4th column is collected in the cooler.

8.8 Adjust the opening of the cooling water inlet valve with such that temp. of distilled water should be 90_0” +/- 5_0_C.

9.0 SHUT DOWN

9.1 Close the plant steam inlet valve.

9.2 Close the water inlet valve.

9.3 Open the drain valve of all 4 columns & drain D. M. Water from each column. Run metering pump and drain D. M. from each column to avoid formation of scaling in column and heat exchanger.

9.4 Switch OFF the metering pump.

9.5 Close D.M. Water inlet valve.

9.6 Close all column drain valves.

9.7 Switch OFF the control panel supply & 3 phase supply.

9.8 Close the compressed air inlet valve.

10.0 REVIEW DATE
After 2 years or when procedure is changed.