Infrastructure & Facilities
Name Of The Test
Methodology & Reasoning
To maintain the standard sizes with minimum variation
Compression Testing machine
To check the mechanical strength of the pipe.
Bend Test and Ball Test
To check the quality of weld as well as the mechanical strength of the pipe.
To check the ease of flow to the wire within the pip
Screw Thread Test
To check the length of the thread as well s the pitch so that pipes can be joined with each other without any problem.
To check the proper adhesion of paint with respect to steel for production against corrosion.
To check whether the quantity of zinc coating is in accordance with the ISI standards for heavy protection.
Preece test as per IS 2633-1986 is conducted to check the uniformity of zinc coating.
Also, the minimum mass of zinc coating as per IS 4736-1986 should be 360gm/m2
Durability of Marking
By rubbing process
Precision welded ERW (Electric Resistance Welded) conduit pipes are manufactured by the High Frequency process on an Automatic Plant, imported from England. Mild steel strips which are used as raw materials are fed into the rolling mill wherein our trademark B.E.C and ISI are embossed at one metre intervals. thereafter formation into pipes, welding, cooling, sizing and cutting into required length is done by an automatic process. The plant is equipped with Servo Control which ensures smooth and uniform welding. According to the specification number IS 9537 (PART II) 1981, the most suited length for a conduit pipe is in the range 3.0 meters to 5.0 metres. Threading is done both ends and one coupler attached to one end. Threading lengths are in accordance with ISI standards. These steel tubes are then dipped in stove enamelled black paint or any other colour as per the customer's requirements. Finally the painted pipes are labelled with stockers mentioning the B.E.C. trademark, the ISI mark and the size of outside diameter. The pipes are then covered with plastic tube and packed with hessian cloth.
However, galvanizing for conduits is done by Hot Dip Galvanizing process heated with oil fired furnace under controlled temperatures. The galvanizing process consists of three main processes; Surface preparation, Galvanizing and Inspection. The steel pipes are degreased using a hot alkaline solution; then dilute solutions of sulphuric acid remove surface rust. Fluxing follows next, wherein the pipes are immersed in liquid flux (zinc ammonium chloride solution) to remove oxides and to prevent oxidation prior to dipping into the bath of molten zinc. In the galvanizing process, steel pipes are immersed in a bath of molten zinc between 815-850 F (435-455 C). During galvanizing the zinc metallurgically bonds to the steel, creating a series of highly abrasion-resistant zinc-iron alloy layers. After the the pipes are withdrawn from the galvanizing bath, excess zinc is removed by draining or vibrating. Coating-thickness and surface-condition inspections complete the process. After the galvanizing process, the galvanized tubes are sent for threading followed by labelling and packing. Since quality of conduits produced is of prime importance at B.E.C, each lot of pipes undergoes through various tests, right from the inspection of raw material to the inspection of final goods.