Schedule XVI

COMPRESSION OF OXYGEN AND HYDROGEN PRODUCED BY THE

ELECTROLYSIS OF WATER

1. The room in which electrolyze plant is installed shall be separate from the

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

electric generator room.

2. The purity of oxygen and hydrogen shall be tested by a competent person

at least once in every shift at the following points

(i) In the electrolysis room;

(ii) At the gas-holder inlet ; and

(iii) At the suction end of the compressor.

The purity figures shall be entered in the register and signed by the

persons carrying out such tests:

Provided, however, that if the electrolyser plant is fitted with

automatic recorded to purity of oxygen and hydrogen with alarm lights, it

shall be sufficient if the purity of the gases is tested at the suction end of

the Compressor only.

3. The oxygen and hydrogen gases shall not be compressed if their purity as

determined under clause 2 above falls below 98 percent at any time.

3-A. The bell of any gas-holder shall not be permitted to go within 30 CMS

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

this limit is reached.

4. In addition to the limit switch in the gas-holder, 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. The water and caustic soda and caustic potash used for making electrolytes

shall be of standards suitable for electrolysis.

6. 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.

7. Oxygen and hydrogen gas pipes shall be painted with distinguishing colors.

Whenever an hydrogen pipe is opened for repairs or any other work, on re-

connection the pipe shall be purged of and air before hydrogen is allowed

to pass through that pipe :

8. Provided that after repairs, hydrogen pipes shall preferably be purged by

an inert gas like nitrogen, whenever possible, before introducing hydrogen

for final purging.

9. All electrical wiring and apparatus in the electrolyser tooth and hydrogen

compression room shall be of flame-proof construction or enclosed in

flame-proof fittings and no naked light or flame shall be allowed to be

taken either in the electrolyser room or where compression and filling of

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

prominent places.

10. No part of the electrolyser plant and the gas-holders and compressor shall

be subjected to welding, bracing, 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 operation no

explosive substance shall be allowed to enter that part until the metal has

cooled sufficiently to prevent risk of explosion.

11. No work of operation, 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 to the electrolysers unless the same is certified

by the competent persons under whose direct supervision erection or

repairs arc carried on to be in a safe condition and the terminals have been

checked for The polarity as required by clause 7.

12. Every part of the electrolyser plant and the gas-holders and compressor

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

noticed shall be rectified forthwith.