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14. Indian Standard Specification IS: 307-1966 sets out certain specifications for CO2. Para 2.1 says that the gas shall be of two grades, namely-

(a) Grade 1, suitable for use as a re-agent and for welding purposes; and,

(b) Grade 2, suitable for beverages, fire extinguishers, refrigeration and general commercial purposes.

Para 4.1 says that the cylinders shall conform to the Gas Cylinder Rules, 1940 with such modification or relaxation or both, as may be ordered from time to time by the Chief Inspector of Explosives, Government of India, or other duly constituted authority. Para 4.2 says that the packing, marking, painting, labelling and transport of cylinders shall be in accordance with the requirements of the Gas Cylinder Rules, 1940 with such modifications or relaxations or both, as may be ordered from time to time by the Chief Inspector of Explosives, Government of India or other duly constituted authority.

15. The Gas Cylinder Rules, 1940 regulate the manufacture, possession, transport and importation of any gas which has been declared to be an explosive within the meaning of the Indian Explosives Act, 1884. The Government of India in the Department of Labour has, by notification No. M-1272(1) dated 28-9-1938 under Section 17 of the Indian Explosives Act has declared any gas when contained in any metal container in a compressed or liquefied state to be an explosive. Rule 11 of the Gas Cylinder Rules provides that the working or internal pressure in any cylinder charged with a permanent gas shall not exceed 1800 pounds to the sq. inch at a temperature at 60°F. Sub-rule (2) provides that cylinders charged with liquefiable gases shall not be filled in excess of the filling ratios specified in Schedule 2 (Filling ratio means the weight of gas permitted for each one pound of water capacity of the cylinder, the accuracy of the charge being determined by weighing). Schedule II to the Rules sets out the filling ratio in respect of CO2 as 0.667 and the working pressure as 1800 pounds per sq. inch at a maximum temperature of 65°C. It is, therefore, clear that the manufacture, possession and transport of compressed CO2 is rigorously regulated by the Gas Cylinder Rules, 1940.