3. DA Cylinder
• Requirements for dissolved acetylene gas cylinders
• The porous substance shall fill as completely as possible the cylinder into which the acetylene is
compressed.
• (75% < Porosity of the substance<92%per cent.)
• If acetone is used as a solvent IS:170 and IS:7312.
• Pressure in the cylinder shall <=16 kgf/cm2 0r 15.69 bar at a temperature of 150C
• Cylinder testing - Hydrostatic pressure to a pressure of not less than 60 kgf/cm2 or 58 bar. This
pressure may be reduced to 53 kgf/cm2 or 52 bar if the cylinder is fitted with fusible plug
• No cylinder which shows a permanent stretch in excess of 7½ per cent of the total stretch
suffered during hydrostatic stretch test shall be allowed
• The safety relief devices if fitted, shall operate at a pressure of 53 kgf/cm2 or at a temperature of
1000C + 40C/–20C
4. DA Cylinder
• Every cylinder shall have permanently and conspicuously marked upon it or upon a brass plate soldered to it
the name of the manufacturer and the words “Acetylene properly compressed into porous substance” and
shall bear the following markings, namely
• (a) Serial number and identification of manufacturer
• (b) Number of the standard;
• (c) Test pressure
• (d) The date of hydrostatic stretch test with code mark of the place where the test was carried out;
• (e) Date of filling of porous mass
• (f) Water capacity
• (g) A symbol to indicate the nature of heat treatment
• (h) Identification of porous mass and porosity percentage
• (i) Tare weight (inclusive of valve)
• (j) Inspector’s official mark
• (k) Maximum gas capacity
• Restriction on filling of dissolved acetylene in cylinders.
• No person shall charge with acetylene any cylinder unless he is in possession of full particulars and the
previous history of such cylinder and has otherwise assured himself that the cylinder complies with the
requirements of these rules.
5. DA Cylinder
• Examination of dissolved acetylene cylinders before filling Whenever a cylinder is charged with acetylene, it
shall be subjected to a thorough visual examination in accordance with IS:8433, if the history of the cylinder
shows that it has not been subjected to such an examination within the previous two years and at the same
time the valves shall be removed and the conditions of the porous substance at the neck of the cylinder
ascertained.
• Period of periodical examination: 01 Year in case the cylinders are filled with loose porous mass.
• License for compression of acetylene
• The compression of the acetylene gas into a cylinder shall be carried out only in such premises as are
licensed by the Chief Controller or Controller
• Record of dissolved acetylene cylinders
• Each firm charging acetylene in cylinders shall keep a record of every cylinder charged by it and this record
shall give the following information, namely: - a) for each charge,
• (i) the date of charging of the cylinder
• (ii) the empty cylinder weight without gas
• (iii) the weight of solvent charged before gas charging
• (iv) full weight of the cylinder
6. DA Cylinder
• The results of each such examination and the name of the person carrying out such
examination, and in the case of cylinders first issued by the firm, the tare weight of the
cylinder including porous substance and acetone or other solvent, the nature of the
solvent and the maximum pressure allowed in the cylinder.
• The record shall be open for inspection of the Chief Controller or the Controller of
Explosives
• The tare weight of the cylinder including porous substance and acetone or other solvent,
the nature of the solvent and the maximum pressure allowed in the cylinder
• Labelling of dissolved acetylene cylinders.
• A warning label attached to every dissolved acetylene cylinder shall, in addition to the
particulars given in sub-rule (2) of Rule 9 bear the following additional particulars,
namely: - (a) date of last filling of gas in the cylinder; (b) weight of gas filled; (c) full
cylinder weight; (d) the name of the company filling the gas on the last date of the filling
7. • Why is acetylene gas cylinder for gas welding to be erected in
upright position?
• Acetylene is highly unstable and flammable and would explode in elevated pressure when reacting with
oxygen in air. Storing acetylene gas in cylinders under pressure is very dangerous. Gas acetylene used for
welding purposes is stored in cylinders of liquid acetone contained in porous material (like firebrick). This is
for cooling purpose in the event of thermal decomposition and to ensure that there is no free space left for
acetylene gas. It also prevents the formation of high-pressure air pockets inside the cylinder. Dissolved
acetylene in acetone will no longer be in contact with oxygen and is not subject to decomposition. Acetone
is used because it is capable of dissolving large amount of acetylene gas under pressure without changing
the nature of the gas
8. • The cylinders for gas welding i.e. oxygen
cylinders and acetylene cylinders, when
not in use should be stored separately
because any mixture of these gases
resulting from accidental leakage can be
highly explosive. When in use, acetylene
cylinders should always be kept in
upright position. Otherwise, acetone
liquid will be drawn from the cylinders
with the gas if they are kept horizontally,
resulting in significant leakage of acetone
liquid will result
Note: Oxygen and acetylene gas cylinders are commonly
used in construction sites for gas welding.
9. VALVES
• Valves fitted to Carbon dioxide cylinders shall be provided in the body with
a safety release consisting of softened copper disc so arranged as to burst
at a pressure between 200Kg/cm2 and 220 Kg/cm2.
• Valves for cylinders containing flammable gases not listed in IS: 3224 shall
have outlets provided with left handed screw threads for the pipes or other
connections
• All other valves shall have outlets with right handed screw threads
• The valves shall be attached to the cylinder neck by screwing and not by
making any permanent attachment or inserting adapter in between
• The design of spindle-operated valves shall be such that when fitted to the
cylinders it shall not be possible to withdraw the spindle under normal
operating conditions
10. • Safety relief devices.
• (1) Cylinders manufactured in India, if fitted with safety relief devices in their
bodies, shall have such safety devices manufactured and maintained in
accordance with IS: 5903.
• (2) Cylinders containing obnoxious or poisonous gases shall not be provided with
any safety device. Explanation.—For the purpose of this sub-rule, “obnoxious or
poisonous gases” include Carbon monoxide, Hydro-cynic Acid, Hydrogen chloride,
Hydrogen bromide, Hydrogen fluoride, Sulphur dioxide, Chlorine, Methyl
bromide, Nitrogen tetroxide, Nitrosyl chloride, Town gas, Hydrogen sulphide,
Carbonyl Chloride (Phosgene), Cyanogen, Cyanogen Chloride, Fluorine and
Carbon oxychloride.
• (3) Cylinders manufactured in foreign countries, approved for use in this country,
if fitted with safety relief devices shall have these devices fully maintained in
accordance with the requirements of the specifications to which they were
originally made.
11. BHARAT METAL CUTTING GAS – PROVIDING YOU THE CUTTING EDGE IN BUSINESS
Oxy-fuel Cutting is indispensable in industry today, thanks to Mr Thomas Fletcher fromWarrington, England,who discovered
that steel could be cut by means of jet of oxygen directed on to a portion of it previously heated to red heat, making it a
revolutionary discovery in 1885. Although the possibility of oxygen cutting was appreciated as early as in the year 1885,
commercial application only started 20 years later.
Since then oxy-fuel cutting has produced far reaching changes in industrial practices relating to cutting and shaping of steel.
In the Indian petroleum industry, Bharat Petroleum revolutionised the world of cutting, welding and brazing by introducing an
innovative product. While the cutting of metal has been done using Oxy-Acetylene Metal Cutting Gas Composition
traditionally, Acetyleneis expensive and has availability constraints.
BPCL has painstakingly studied the needs of the industry which need metal cutting gasto cut metal and came up with Bharat
Metal Cutting Gas (BMCG), an ideal substitute for Acetylene. BMCG offers superior cutting at a low cost and is an ideal fuel
for cutting and brazing applications.
Advantages of Bharat Metal Cutting Gas are:
•Superior cutting at low cost (better cutting speed, kerf formation and surface finish)
•Low oxygen consumption
•Reduces cylinder inventory by at least three times compared to Oxy Acetylene
•Low slag formation
•BMCG can easily cut 12 inch (300 mm) thick metal and even more.
•Has a lower explosive limit in air and oxygen than Acetylene. Hence has lower band of inflammability than Acetylene
•The cylinder pressure of BMCG (6-7kg/cm2) is one third of Acetylene (17-18 kg/cm2). Hence they are safe to use.
•BMCG cylinders are easier to handle due to lighter weight
•BMCG cylinders are available in a range of pack sizes (19kg, 35kg & 47.5kg) to suit specific requirement of customers.
•Awareness and education programs on safety to the end users
12. MAJOR SECTORS USING BMCG ARE
Cement Plants
Sugar Factories
Fertilizers Plants
Manufacturing Units
Heavy Engineering Companies
Refinery and Petrochemical
Textile Industries
Infrastructure & Projects Companies
Telecom
Automobile
White Goods Industry
Mining Sector
Unorganised Sectors
