Inflamable Liquid and Substance Act

Carbide of Calcium Regulations 1967

[GN 85 of 1967 – 1 January 1968] [Section 3]

1. These regulations may be cited as the Carbide of Calcium Regulations 1967.

2. In these regulations –

"certificate of registration" means a certificate issued by the Chief Fire Officer authorising any person to use the premises therein specified for the storage of carbide of calcium;

"Chief Fire Officer'' means the Chief Fire Officer or any person authorised by him to act on his behalf;

"store" means any building or structure, or part of a building or structure, which is used or intended to be used for the storage of carbide of calcium.

3. No person shall manufacture, store or transport acetylene gas at a pressure in excess of 1.5 kg/cm2 unless such gas is contained in a homogeneous porous substance, with or without acetone or other suitable solvent, and no person shall manufacture liquid acetylene.

4. It shall be lawful to keep or store two and a half kilogrammes of carbide of calcium provided that such carbide of calcium is kept in separate hermetically closed metal vessels containing not more than half a kilogramme each.

[Reg. 4 amended by reg. 2 of GN 99 of 1968 w.e.f. 18 May 1968.]

5. It shall be lawful to keep or store 14 kilogrammes of carbide of calcium provided that the following conditions are observed –

(a) the carbide shall be kept only in a metal vessel or vessels hermetically closed at all times when the carbide is not actually being placed in or withdrawn from such vessel or vessels;

(b) the vessels containing carbide shall be kept in a dry and well-ventilated place;

(c) due precautions shall be taken to prevent unauthorised persons having access to the carbide;

(d) notice shall be given of such keeping to the Chief Fire Officer;

(e) where a fixed generator is used on the premises, full and detailed instructions to be supplied by the maker, as to the care and use of the generator, shall be kept constantly posted up in such place as to be conveniently referred to by the generator attendant.

[Reg. 5 amended by reg. 3 of GN 99 of 1968 w.e.f. 18 May 1968.]

6. (1)Any person intending to keep carbide of calcium shall apply to the Chief Fire Officer for a certificate of registration to that effect.

 (2) A certificate of registration shall be issued on payment of the appropriate fee set out in the Schedule.

7. (1)A certificate of registration shall be granted subject to such conditions as the Chief Fire Officer may determine and shall be valid for any period not exceeding one year from the date of issue.

 (2) An application for renewal shall be made at least 14 days prior to the date of expiry.

8. A certificate of registration may be transferred from one person to another upon application to and approval by the Controller, and on payment of the appropriate fee specified in the Schedule.

[Reg. 8 revoked and replaced by reg. 3 of GN 65 of 2003 w.e.f. 7 June 2003.]

9. Any person who –

(a) stores or keeps carbide of calcium without having first obtained a certificate under these regulations;

(b) contravenes any condition attached to a certificate granted under these regulations,

shall commit an offence and shall, on conviction, be liable to a penalty not exceeding 200 rupees for each day on which the contravention continues.

10. (1)Where the application is for a certificate to keep 500 pounds or more, a plan drawn to the scale of one eighth of one inch to the foot showing the places where it is proposed to keep carbide of calcium, and the buildings and structures within 50 feet of such places shall be submitted to the Chief Fire Officer.

 (2) A sectional elevation of the storage place shall also be shown.

11. Calcium carbide shall be packed in watertight and airtight metal containers of sufficient strength to permit handling without rupture.

12. Vessels in which carbide of calcium is kept or conveyed shall be at all times in good order and repair and shall have attached thereto a label stating in conspicuous character the words "carbide of calcium", "Dangerous if not kept dry" and the caution "The contents of this package are liable, if brought into contact with moisture, to give off a highly inflammable gas", or any similar warning to the same effect.

[Reg. 12 amended by reg. 4 of GN 99 of 1968 w.e.f. 18 May 1968.]

13. Generator houses and rooms shall be –

(a) well ventilated, if necessary, by mechanical means;

(b) adequately lit by natural light in daytime.

14. (1) (a) Every fixed apparatus used for generating and storing acetylene gas shall be situated in an outbuilding, or in a suitable place in the open air.

(b) There shall not be any direct communication between any adjoining building, other than a storage place, and that in which the generating apparatus is situated.

(2) Metal containing more than 70 per cent of copper shall not be used in the construction of any acetylene generating apparatus.

(3) The generating apparatus shall be maintained in an efficient working condition.

(4) No weights other than those specified by the maker shall be placed upon the floating gas holder of the apparatus.

(5) A person shall not have charge of a generating apparatus until he has been properly instructed in its use and is capable of its management.


15. Every generator in which the pressure is not completely controlled by the head of water shall be provided with a reliable pressure gauge.

16. On the dial of the pressure gauge, the maximum permissible working pressure shall be indicated by a red mark and the range of the scale shall exceed the working pressure by at least 50 per cent.


17. Every generator in which the pressure is not completely controlled by the head of water shall be provided with at least one safety valve such that –

(a) the maximum permissible working pressure cannot be exceeded by more than 0.1 kg/cm2 (1.5 lb./sq. in) and the valve ceases to function when the pressure falls to 0.1 kg/cm2 (1.5 lb./sq. in) below the maximum permissible working pressure;

(b) its proper functioning cannot be impaired by wear, rust, dirt, damp, or the like; and

(c) it cannot easily be tampered with.

18. Every fixed generating apparatus shall be provided with suitable means for conveying any exhaust acetylene to a safe place in the external atmosphere.

19. (1)The diameter of the pipes conveying the gas from the generating apparatus shall be proportionate to the maximum rate of the generation so that undue back pressure from chocking is not likely to occur.

 (2) The escape of gas from any part of the apparatus shall be carefully guarded against.


20. Stationary low pressure acetylene generators shall be provided with relief or overflow pipes that will prevent the accumulation of excessive quantities of gas in the gas holder.

21. The relief or overflow pipe of stationary generators shall –

(a) be installed without trap and so that any condensation will drain back to the generator;

(b) not have any fitting for stopping the flow of gas;

(c) have a diameter at least equal to that of the gas delivery pipe; and

(d) discharge outside the building at least 5 metres (16 feet) from any building opening, open flame, naked light, fireplace, chimney, or incandescent or flammable object, and at least 3.7 metres (12 feet) above the ground.

22. The discharge end of the overflow pipe shall be adequately protected against obstruction by rain, snow, ice, insects, birds and any other thing.


23. (1) Every acetylene generator shall be provided inside the generator house or room with an easily accessible quick-acting shut-off valve or similar appliance, capable of instantaneously cutting off the whole supply of gas.

(2) –

[Reg. 23 amended by reg. 5 of GN 99 of 1968 w.e.f. 18 May 1968.]


24. The total hourly production of a stationary acetylene generator shall not exceed the rate for which the generator is marked.

25. The pressure in stationary automatic acetylene generators or their gas holders shall at no time exceed 1.5 kg/cm2 (22 lb./sq. in).

26. The supply of carbide and water to the generator shall be so regulated that neither the generating nor the cooling water reaches a temperature over 70°C (158°F).

[Reg. 26 amended by reg. 6 of GN 99 of 1968 w.e.f. 18 May 1968.]

27. The carbide shall be completely decomposed in the generator so that the lime sludge discharged shall not be capable of generating gas.

28. Before recharging stationary Batch type acetylene generators, all residue of the previous charge shall be removed and the generating chamber shall be flushed out with water.

[Reg. 28 amended by reg. 7 of GN 99 of 1968 w.e.f. 18 May 1968.]

29. During charging operations and removal of carbide, the water chambers shall be kept full, in order to avoid the danger of explosive mixtures of air and gases within the water space and also to prevent dropping fresh carbide into insufficient water.

30. (1) No person shall smoke, and there shall be no fires, naked lights, matches or any other substance or article liable to cause explosion or fire within 5 metres (16 feet) of any generator house or room.

(2) A conspicuous notice embodying the prohibition in paragraph (1) shall be posted outside the generator house or room.

[Reg. 30 amended by reg. 8 of GN 99 of 1968 w.e.f. 18 May 1968.]

31. Every stationary generator shall be easily accessible.

32. No unauthorised person shall have access to a generator house or room.

33. With generators of the continuously operating type, it shall be possible to ascertain during working whether there is sufficient generating or cooling water.

34. It shall be possible, if necessary, to add water without appreciable quantities of acetylene escaping.

35. The air space in the generator shall be as small as possible.

36. Decomposition of carbide shall not take place in a gas holder under a movable gas bell.

37. On non-automatic generators, all water overflows shall be visible.

38. Portable acetylene generators shall not be used –

(a) in rooms having a cubic capacity less than 50 times the total gas-generating capacity per charge of all generators in the room;

(b) in rooms less than 3 metres (10 feet) in height; or

(c) within 3 metres (10 feet) of combustible material other than the floor.

39. Portable acetylene generators shall not be moved by cranes or derricks, unless they are provided with special attachments for this purpose.

40. Two or more portable generators shall not be coupled to the same gas holder or delivery pipe to work simultaneously unless –

(a) they are designed to operate at the same working pressure; and

(b) the backfire arresters are adequate for the increased supply of gas.

41. When not in use, portable acetylene generators shall not be stored in any room having open lights or fires unless they have been emptied of carbide and thoroughly cleaned.

42. Portable generators shall be cleaned and recharged in the open air or in an adequately ventilated building, not within 20 feet of any fire or other means of igniting acetylene gas. Such generators shall be so placed and used as not to be easily overturned, and when not in use shall be kept within a locked building secure from unauthorised persons.

43. Filling rooms for charging acetylene cylinders shall be divided into filling platforms –

(a) with not more than 30 filling connections in each; and

(b) so arranged that in an emergency the workers can leave the building, quickly and unimpeded, by a route as direct as possible.

44. Where a number of filling platforms can be supplied simultaneously with acetylene gas from the same compressor, the supply piping to the platforms shall be so arranged that each platform can be separately disconnected from an easily accessible and safe station.

45. When recharging generators of the "Dipping" type, the carbide of calcium basket shall always be cleaned and filled with new carbide of calcium. Partly spent carbide of calcium shall not, under any circumstances, be replaced into the generator.


46. All parts of acetylene-generator installations shall be maintained in good condition at all times.

47. Hydraulic seals shall be kept filled to the proper level and periodically examined and cleaned.


48. In dismantling any part of an acetylene installation, special care shall be taken to prevent the generation of sparks by friction or impact, unless all the precautions required in regulation 49 have been taken.

49. Before any part of an acetylene installation undergoes repair, it shall be –

(a) thoroughly cleaned;

(b) carefully cleared of carbide, residue and sludge;

(c) thoroughly flushed; and

(d) completely filled with water, steam or an inert gas.


50. Dissolved acetylene shall only be manufactured under the responsibility and supervision of a manager having adequate experience and technical knowledge.

51. (1) Premises in which dissolved acetylene is manufactured shall not be situated in the vicinity of large industrial undertakings or undertakings with high fire risks.

(2) The buildings shall be of one storey only and shall be readily accessible to the fire brigade on all sides.

52. Acetylene-compressor rooms and filling rooms shall be –

(a) separated from each other and from acetylene-generating and calcium carbide storage rooms by an adequate distance or by heavy explosion-resisting walls;

(b) situated not less than 30 metres (100 feet) from the boundaries of adjoining property, and not less than 50 metres (165 feet) if the monthly capacity exceeds 25,000 cubic metres (883,000 cubic feet); and

(c) situated at least 5 metres (16 feet) from doors, windows and other openings in neighbouring buildings in which there are exposed sources of ignition such as bare lights, open flames and flammable materials.

53. Adequate supplies of water for fire extinguishing shall be kept readily available at suitable places on the premises.


54. Acetylene generators shall bear durable and legible markings showing –

(a) the size of the carbide to be used and the maximum weight permissible for a single charge;

(b) the highest permissible production of acetylene per hour;

(c) the maximum allowable working pressure of the generator;

(d) the name or number of the type of generator and the date when first taken into use; and

(e) the name and address of the manufacturer or distributor.


[Reg. 55 revoked by reg. 9 of GN 99 of 1968 w.e.f. 18 May 1968.]


56. Unless acetylene generators are provided with an adequate open water overflow, or an automatic water shut-off which will effectively prevent overfilling of the generator –

(a) water shall not be supplied through a continuous connection; and

(b) facilities for observing the water supply shall be afforded by terminating the supply pipe at least 5 centimetres (2 inches) above the filling opening.


57. Electric motors for driving acetylene boosters shall be located outside the booster room, with the drive shaft passing through a gas-tight stuffing box, or equivalent device, in the dividing wall.

58. Acetylene boosters shall be of a type approved by the Chief Fire Officer and shall be provided with suitable devices for relieving pressure exceeding 1.5 kg/cm2 (22 lb./sq. in) to the open air, or for returning the gas to the inlet side or the gas supply source.

59. Acetylene boosters shall be water-cooled with visible water supply or provided with an interlocking device to stop the booster in case of failure of the cooling-water supply.

60. Discharge outlets of acetylene boosters shall be equipped with a suitable flash arrester or hydraulic back-pressure valve.

61. (1) (a) Flash back arresters shall be fitted in the acetylene supply pipes between the generators and each blow-pipe, and as near to the blow-pipe as practicable.

  (b) A separate flash back arrester shall be fitted for each blow-pipe and shall be frequently inspected, and cleansed when necessary.

(2) The water level in hydraulic back pressure valves shall be examined daily before commencing to use the apparatus, and shall be adjusted as often as is necessary to maintain conditions of safety.


62. Every generator shall be provided with a purifier of adequate capacity.

63. Purifying substances shall not –

(a) unduly impede the passage of the acetylene; or

(b) contain ingredients that –

 (i) form explosive compounds with acetylene; or

 (ii) attack metal.


64. At every delivery point in an acetylene distributing system, a hydraulic seal or equivalent device shall be installed that will –

(a) withstand an internal explosion of acetylene and oxygen;

(b) prevent the passage of oxygen or air into the generator or gas holder; and

(c) prevent backfires from reaching the generator.

65. Gas holders of over 400 litres (14 cubic feet) effective capacity shall be separated from the generator by a hydraulic seal or equivalent device.

66. Enclosed hydraulic seals shall be –

(a) provided with a water-levelling or try gauge cock; and

(b) so constructed and installed that they can easily be opened and inspected internally.


67. Every stationary acetylene installation shall be connected by an open drain to an open sludge pit or tank vented to the open air.

68. Sludge pits shall be adequately fenced.


69. Stationary acetylene generator installations shall be inspected, tested and approved by qualified inspectors accepted by the Chief Officer before being placed in service for the first time.

70. The results of every test shall be recorded in a certificate by the competent inspector.

71. The certificate referred to in regulation 6 shall be kept available for inspection by the Chief Fire Officer.

72. (1) (a) Every licensee shall exhibit a copy of those conditions of the licence which are to be observed by persons employed on the premises.

  (b) Failure to observe this requirement shall render the licensee liable on conviction to a fine not exceeding 100 rupees.

(2) Any employee who contravenes any condition of the licence which has been exhibited shall, on conviction, be liable to a fine not exceeding 100 rupees.

73. (1)The licensee or his representative shall notify the Chief Fire Officer of any accident of fire or explosion occurring on the premises which involves carbide of calcium and occasions loss of life or personal injury.

 (2) Failure to comply with this requirement shall render the licensee liable on conviction to a fine not exceeding 200 rupees.

74. (1)Every store shall be constructed of fire resisting material with the door opening outwards or of a sliding type, and so maintained as at all times to be free from water and shall have no cellar or basement beneath.

 (2) The floor shall be raised above the surrounding ground level, or other suitable precautions taken to the approval, in writing, of the Chief Fire Officer to prevent flood water from coming into contact with the carbide of calcium.

75. Adequate ventilation shall be provided at high and low levels in the storage place, and in any place in which carbide of calcium is used, and no vessel or other article shall be so placed as to obstruct such ventilating apertures.

76. Every store shall, unless it is continually under the supervision of an authorised person, be kept closed and securely locked except when carbide of calcium is being placed thereinto or removed therefrom.

77. (1)There shall be kept prominently and distinctly painted in block letters of at least 2 inches in height and of proportionate breadth on the outer side of every store and place in which acetylene gas is generated, the words "carbide of calcium".

 (2) Naked lights and smoking are prohibited.

78. There shall not be kept other than commercially pure carbide of calcium, that is, that which corresponds to the formula of the British Standards specification current from time to time.

79. The total quantity of carbide of calcium to be kept on the premises shall not at any time exceed that in respect of which the licence is granted.

80. All due precautions shall be taken to prevent accident by fire or explosion, and for preventing unauthorised persons and persons under the age of 16 years from having access to the storage place.



[Reg. 81 revoked by reg. 10 of GN 99 of 1968 w.e.f. 18 May 1968.]

82. In order to prevent collapse of acetylene gas holder bells or breaking of the water seal due to vacuum caused by the booster or cooling of the gas, an automatic booster cut-off shall be provided at a point 30 centimetres (12 inches) or more above the landing point of the bell.

83. The gas bell shall move freely without tendency to bind and shall have a clearance of at least 5 centimetres (2 inches) from the shell.

84. Every vessel intended for the storage of carbide of calcium which is not kept within a store shall be conspicuously marked with the words "carbide of calcium Dangerous if not kept dry".

85. (1)Carbide of calcium shall be kept in metallic vessels so constructed and closed as to prevent the admission of water or atmospheric moisture, and not more than one vessel shall be opened on the premises at any one time unless provided for in the certificate of registration, and then only for the time necessary for the removal of a quantity of carbide of calcium, or for the refilling of the vessel.

 (2) When the contents of an opened vessel are not entirely used, the remainder shall be kept in a storage vessel which can be hermetically sealed.

 (3) Every vessel of a capacity exceeding 2 pounds shall be either provided with a lock or kept in a locked store.

86. (1)Where a pressure gauge is fitted to the generating apparatus, it shall be maintained in an efficient condition.

 (2) The gas pressure shall not exceed 9 pounds to the square inch above that of the atmosphere, except where authorised by the Chief Fire Officer.

87. Carbide of calcium shall be decomposed in an excess of water within the gas making apparatus and suitable arrangements made for the safe disposal of residue therefrom and carbide of calcium or the residue therefrom shall not be allowed to enter any inlet or drain communicating with a public sewer or introduced into a sewage cesspool.

88. Except in cases where a slines dam or other similar process is used, an open tank or pit shall be provided and maintained in good condition in the open air for the reception of the solid residue of the carbide of calcium and such residue shall remain in 4 times its bulk of water in such tank or pit until all acetylene from dry undecomposed carbide of calcium is disposed therefrom.

[Reg. 88 amended by reg. 11 of GN 99 of 1968 w.e.f. 18 May 1968.]

89. Any artificial lighting used in any place where carbide of calcium is kept and where acetylene gas is generated shall be of an enclosed vapour-proof type and any wiring associated therewith shall be encased in seamless steel screwed conduit, and the switches and fuses shall be outside the building.


90. Cylinders for compressed, liquefied and dissolved gases, their fittings and attachments, shall be –

(a) so designed as to be suitable for the particular circumstances of their use; and

(b) of sufficient strength to sustain the internal pressures to which they will normally be subjected.

91. Cylinders for compressed, liquefied or dissolved gases shall be of material of good quality, free from injurious defects, and of adequate thickness and weight in conformity with the specifications established by the Chief Fire Officer.


92. Every cylinder shall be provided with –

(a) a device that prevents damage to the bottom of the cylinder; and

(b) a protective cap or other equivalent protection for the valve.

93. The protective cap shall have a vent of such size as to prevent any gas pressure accumulating inside the cap.

94. For parts of valves and other fittings, only such materials shall be used as are not attacked by the contents of the cylinder.

95. Copper and alloys containing copper shall not be used for parts of fittings on cylinders for liquefied ammonia or ammonia dissolved under pressure, unless the use of certain alloys specially composed for that purpose has been permitted by the Chief Officer.

96. All fittings of cylinders for oxygen and other gases shall be kept free from oil or grease.

97. For all flammable gases, the connection-screw thread shall be left-handed, and for all other gases shall be right-handed.

98. The maximum charging pressure of dissolved acetylene shall not exceed 15.7 kg/cm2 (225 lb./sq. in) at a temperature of 15.5°C (60°F).

[Reg. 98 amended by reg. 12 of GN 99 of 1968 w.e.f. 18 May 1968.]

99. New cylinders for dissolved acetylene shall be examined by a qualified inspector accepted by the Chief Fire Officer to see that the cylinders have been properly charged with porous mass and acetone.

100. For the purpose of paragraph 42, the inspector shall verify the weight of the cylinder when empty and when charged with porous mass and acetone.

[Reg. 100 amended by reg. 13 of GN 99 of 1968 w.e.f. 18 May 1968.]

101. Periodical tests of cylinders for dissolved acetylene shall include –

(a) an external examination;

(b) verification that the cylinder is completely filled with porous mass;

(c) verification of the weight of the cylinder together with the porous mass and acetone; and

(d) a test with acetone or inert gas at a pressure of 60 kg/cm2 (850 lb./sq. in) when it is not possible to discharge the porous material and to fill the cylinder with water.

[Reg. 101 amended by reg. 14 of GN 99 of 1968 w.e.f. 18 May 1968.]

102. Deficiencies in the weight of the porous mass and acetone shall be made good by the owner or the person responsible for the maintenance of the cylinder before the cylinder is again put into service.

103. The porous mass shall –

(a) completely fill the cylinder;

(b) be so composed that it –

 (i) can be tested at all times without difficulty as to the presence of all components;

 (ii) does not separate out; and

 (iii) retains its physical and chemical properties unchanged;

(c) not attack the cylinder;

(d) not form harmful compounds either with acetylene or with the solvent;

(e) not subside or form dangerous cavities, even after long and rough usage; and

(f) effectively prevent the spread through the contents of the cylinder of any explosive decomposition of the acetylene.

104. Every firm charging a cylinder for dissolved acetylene shall keep a record of every cylinder charged showing –

(a) the date of each charging of the cylinder;

(b) the date of each addition of acetone or porous mass; and

(c) the date and results of each examination.

105. The records referred to in regulation 104 shall be available for inspection by the Chief Fire Officer.

106. Copper and alloys containing more than 70 per cent of copper shall not be used for parts of fittings that may come into contact with acetylene unless the use of certain alloys specially composed for that purpose has been permitted by the Chief Fire Officer.

107. Charged acetylene cylinders shall be kept in an upright position for at least 12 hours before the contents are used.

108. The filling pressure and velocity for charging acetylene cylinders with the gas shall be so adjusted that –

(a) the pressure in the cylinder at no time during the operation exceeds 25 kg/cm2 (355.5lb./sq. in); and

(b) no cylinder can leave the works under a pressure exceeding 15.7 kg/cm2 (225 lb/sq. in) at a temperature of 15.5°C (60°F).

[Reg. 108 amended by reg. 15 of GN 99 of 1968 w.e.f. 18 May 1968.]


[Reg. 109 revoked by reg. 16 of GN 99 of 1968 w.e.f. 18 May 1968.]

110. Only reliable persons over 18 years of age shall be employed in filling rooms.

111. No fire, flame, artificial light or other article capable of igniting acetylene gas shall be in or within 20 feet of any place in which acetylene gas is kept or generated unless separated therefrom by a wall or screen of such cons

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