Schedule XIII

COMPRESSION OF OXYGEN AND HYDROGEN PRODUCED BY

ELECTROLYSIS OF WATER

1. Location of electrolyte plant- Theroom in which electrolysis plant is installed shall be

separate from the plant for storing and compressing the oxygen and hydrogen and also the

electric generator room.

2. Testing of purity - (1)The purity of oxygen and hydrogen shall tested by a competent

person at least once in every shift at the following posts:-

(a) in the electrolysis room;

(b) at the gas holder inlet; and

(c) at the suction and of the compressor.

(2) The purity figures shall be entered in a register and signed by the persons carrying out

such test:

Provided, however, that if the electrolysis plant is fitted with automatic recorder of purity of

oxygen and hydrogen with alarm lights, it shall be sufficient if the purity of gases is tested at

the suction and of the compressor only.

3. Restriction as to the compression - The oxygen and hydrogen gases shall not be

compressed if their purity as determined under paragraph 2 above falls below 98%at any time.

4. Provision of negative pressure switch - In addition to the limit switch in the gasholder,

a sensitive negative pressure switch shall be provided in or adjacent to the suction main for

hydrogen close to the gas holder and between the gas holder and the hydrogen compressor to

switch off the compressor motor in the event of the gas holder being emptied to the extent as

to cause vacuum.

5. Switch for gas holder - The bell of any gas holder shall not be permitted to go within

the 30 centimeters of its lowest position when empty and a limit switch shall be fitted to the

gas holder in such a manner as to switch off the compressor motor when the limit is reached.

6. Purity of caustic soda - The water, caustic soda and caustic potash used for making lye

shall be of standards suitable for electrolysis.

7. Precautions against reversal of polarity - Electrical connections at the electrolyser cells

and at the electric generator terminals shall be so constructed as to preclude the possibility of

wrong connections leading to the reversal of polarity and in addition an automatic device shall

be provided to cut off power in the event of reversal of polarity owing to wrong connections

either at the switch board or at the electric generator terminals.

8. Colouring of gas pipes - Oxygen and hydrogen gas pipes shall be painted with

distinguishing colours. Whenever a Hydrogen pipe is opened for repair or any other work, on

reconnection the pipe shall be purged of all air before hydrogen is allowed to pass through that

pipe.

9. Use of flameproof fittings - All electrical wiring and apparatus in the electrolyser room

shall be of flameproof construction or enclosed in flameproof fittings and no naked light or

flame shall be allowed to be taken either in the e!ectrolyser room or where compression and

filling of the gases is carried on and such warning notices shall be exhibited in prominent

places.

10. Prohibition of hot work - No part of the electrolyser plant and the gas holders

and compressor shall be subjected to welding, brazing, soldering or cutting until steps have

been taken to remove any explosive substance from that part and render the part safe for such

operations and after the completion of such operations no explosive substance shall be allowed

to enter that part until the metal has cooled sufficiently to prevent risk of exploslon.

11. Repair, etc. to be done under supervision - No work or operations, repair or

maintenance shall be undertaken except under the direct supervision of a person who, by his

training, experience and knowledge of the necessary precautions against risk of explosion is

competent to supervise such work.

No electric generator after erection or repairs shall be switched on/the electrolysers unless the

same is certified by the competent persons under whose direct supervision erection or repairs

are carried on to be in a safe condition and the terminals have been checked for the polarity as

required by paragraph 7.

12. Checking of plant - Every part of the electrolysis plant and the gas holders and

compressor shall have a regular schedule of overhaul and checking and every defect noticed

shall be rectified forthwith.