Schedule XXXV

(See rule 84) THERMIC FLUID HEATERS

1. All heaters shall be of such construction that coils are removal for periodic cleaning, visual inspection

and hydraulic test.

2. Suitable arrangements shall be made for cooling the furnace effectively incase of power failure.

3. Before restarting the furnace, it shall be effectively purged.

4. Velocity or flow of the thermic fluid shall not be allowed to fall below the minimum recommended by

the manufactures while the heater is in operation.

5. The thermic fluid shall be circulated in a closed circuit formation with an expansion–cum- deaerator

tank. This tank shall be located outside the shed where the heater is installed

6. Every heater shall be provided with a photo-resistor actuated auto-visual alarm to indicate flame failure

and automatic burner cutoff

7. The stack temperature monitor-cum-controller with audiovisual alarm shall be provided so as to warn

operator in case the outlet temperature exceeds the specific minimum.

8. Where inspection doors are provided on the furnace they shall be interlocked with the burner itself so

that they cannot be opened until burner is shut off and furnace is cooled sufficiently.

9. All heaters shall also be provided with the following safety devices:-

a) Level control in the expansion tank

b) Temperature control of thermic fluid;

c) Differential pressure switch on the outlet line of the heater tubes; and

d) Temperature control device for the fuel oil supply to the burner.

10. All devices specified in paragraph (9) shall have interlocking arrangement with burner so that in case

of any predetermined limits being crossed, the supply of fuel and air shall automatically be cut-off.

11. All safety interlock when operated shall be indicated on the control panel of the heater by a suitable

audio visual alarm

12. Every heater unit shall be provided as a standard accessory an arrangement for sniffing with low

pressure steam or nitrogen for putting out the fire.

13. Electric panel for the heater shall be located near the heater but not so close as to be exposed to spilling

or leaking oil.

14. The heater shall be located in a place partitioned off with fire proof material from other manufacturing

activities.

15. Explosion vent shall be so installed that release takes place at safe location.

16. The heater coil shall be subjected to pressure test by competent person once at least in every twelve

months. The test pressure shall not be less than twice the operating pressure.

17. If repairs are carried out to the coil, it shall be tested before taking it into use.

18. The thermic fluid shall conform to the specifications specified by the manufacturers and shall be tested

by competent person for suitability at least once in every three months period. Such test shall include

test for acidity, suspended matter, ash content, viscosity and flash point.

19. Cleaning of internal surface of the heater soot and checkup of refractory surface on the inside shall be

carried out every month or as often as required depending upon working conditions. The coils shall be

removed and surface of the coils cleaned thoroughly once at least in a period of six months. The burner,

nozzles, oil filters and pumps shall be cleaned once a week during the period of use.

20. A separate register containing the following information shall be maintained:-

a) weekly checks carried out confirming the effectiveness of the interlock;

b) weekly checks confirming that all accessories are in good state of repairs; and

c) information regarding fuel, oil temperature, pressure, thermic fluid inlet/outlet pressure and

temperature, fuel gas temperature, recorded at four hourly intervals.

21. The heater when in operation shall always be kept in charge of a trained operator.