H Type Acetylene Generator

High-Pressure Type H3 Water To Carbide

The Generator works on the water to carbide principle of generating acetylene gas at pressures permitted by the Department of Explosives, Government of India. The unit consists of a Generator Tank which contains two gas producing chambers, each containing a carbide tray and also a built-in filter at the top.

Water is pumped into the Generator Tank by a hand-operated pump. The water regulator regulates the flow of water to the carbide in the tray housed inside any one of the chambers.

The Acetylene gas generated by the chemical reaction between Calcium Carbide and Water passes upwards through a pipe fitted with a nonreturn ball valve (one on each gas chamber) into the Generator Tank. Through a filter and a shut-off valve and a non-return valve gas enters the bottom of the flash-back arrestor. From here the gas further passes through the Pressure-Regulator to the Gas outlet cock to which the welding hose is connected.


  • Lump size calcium carbide can be used.

  • The pressure in the generator can be increased up to the maximum permissible statutory limit by pumping water into the Generator Tank. In other words, the same mass of gas is compressed from a lower pressure to a higher pressure by the increase in the level of water which acts as a liquid piston, thus making it safe at higher pressures. This is in contrast to other generators where the pressure is increased by the additional generation of gas which would involve a higher explosive potential under similar operating conditions.

  • The safety-valve which opens at the set pressure drains-out water, thus lowering the water level with consequent reduction of pressure. Thus, there is no wastage of acetylene gas through the safety valve. If this were not done the vicinity of the generator would be contaminated with an explosive air-acetylene mixture. This is in contrast to the other model of generators which blow out the gas through the Safety valves, thereby increasing the operational hazards.

  • Because of higher working pressure, the equipment is more compact in size and lesser in weight, compared to other types of generators of equivalent capacity.


Diameter of Generator Tank 730 mm
Overall Height 1600 mm
Maximum Width 1200 mm
Approximate Empty Weight 250 Kgs
Capacity of Each Carbide Tray 12.5 Kg (25/50 mm size)
Gas Output per charge per tray 3125 to 3375 Litres depending upon the size & quality of carbide.
Maximum Working Pressure 1.5 kg/cm²
Brass Fittings Less than 70% copper
Safety Valve Adjustment 1.65 Kg/cm²
Flow Rate Maximum Standard 3.25 Cubic Meter/hr.
Relevant Indian Standard IS - 8471 (Part IV) - 1977.