Schedule XXXV

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 in case of power

failure.

3. Before restarting the furnace, it shall be effect 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 ls 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 cut

7. The stack temperature monitor-cum-controller with audiovisual alarm shall be provided

so as to warn operator 1n case the outlet temperature exceeds the specific minimum.

B. 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 of and furnace is cooled sufficiently.

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

(i) Level control in the expansion tank

(ii) temperature control of thermic fluid:

(iii) differential pressure switch on the outlet line of the heater tubes; and

(iv) 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 shifting

with low pressure steam or nitrogen for putting out the fire.

13. Electoral 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 installed that release thanks place at safe location.

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

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 contents. viscosity and

flash point.

19. Cleaning of internal surface of the heater so at 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 charges of a trained operator. ··