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Draft Indian Standard GALVANIZED STEEL …

Doc:MED 10 (0977)C 2 1 SCOPE This standard covers the requirements for two types of galvanized steel barbed wire with two strands of wire, in …

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Text of Draft Indian Standard GALVANIZED STEEL …

For Comments Only Doc:MED 10 (0977) C Our ref: MED 10/T- 1 October 2007 1 Not to be reproduced without the permission of BIS or used as a STANDARD Last date for the receipt of comments is 15 January 2008 Draft Indian Standard GALVANIZED STEEL BARBED WIRE FOR FENCING - SPECIFICATION (Fourth Revision of IS 278) ICS ; FOREWORD (Formal adoption clauses will be added later) This standard was first published in 1951, revised in 1962 and 1978. The present revision has been taken up with a view to modify the earlier provisions in the light of experience gained in implementation of this standard by both manufacturers and users. In this revision, all the four amendments issued to third revision have been incorporated. The following are the main changes in this revision: a) Requirement of galvanizing has been changed to minimum medium or heavy coating in place of minimum medium coating. b) Use of electro galvanized wire has been included for fabrication of barbed wire. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed and calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2:1960 'Rules for rounding off numerical values (revised)'. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. Doc:MED 10 (0977)C 2 1 SCOPE This standard covers the requirements for two types of galvanized steel barbed wire with two strands of wire, in a number of sizes and constructions. 2 REFERENCES The following standards contain provisions, which through reference in this text constitute provision of this standard. At the time of publication, the editions indicated were valid. All the standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. IS No. Title 280:1978 Mild steel wire for general engineering purposes (third revision) 1340:1977 Code of practice for chromate conversion coating of zinc and cadmium coated articles and zinc base alloys (first revision) 1521:1972 Method for tensile testing of steel wire (first revision) 1755:1983 Method for wrapping test for metallic wire (first revision) 2633:1986 Method for testing uniformity of coating of zinc coated articles(second revision) 4826:1979 Hot dipped galvanized coating on round steel wires (first revision) 12753:1989 Electro galvanized coatings on round steel wire - Specification 3 TERMINOLOGY For the purpose of this standard, the following definitions shall apply. Length of the Barb Shall mean the distance of the barb point from the axis of the line wire of wires around which the point wire is wound. Line Wire Shall mean a wire of specified diameter of which the barbed wire is made. Point Wire Shall mean a wire of specified diameter of which the barbs are made. 4 TYPES Type A (Iowa Type) The barbs shall have four points and shall be formed by twisting two point wires, each two turns, tightly around both line wires making altogether four complete turns (see Fig. 1). Doc:MED 10( 0977)C 3 Type B (Glidden Type) The barbs shall have four points and shall be formed by twisting two point wires, each two turns, tightly around one line wire making altogether four complete turns (see Fig. 1). Doc:MED 10 (0977)C 4 5 SIZES The sizes of barbed wire shall be as given in Table 1. Table 1 Sizes (Clause 5) Diameter of Wire Line Wire Point Wire Mass of completed Barbed Wire Size Designation Nominal mm Tolerance mm Nominal mm Tolerance mm Max g/m Min g/m Distance between two barbs mm No. of lays between the two consecutive barbs 1 155 136 75 12 2 to 7 2 120 108 150 12 2 to 7 3 125 108 75 12 2 to 7 4 103 89 150 12 2 to 7 5 106 97 75 12 2 to 7 6 85 78 150 12 2 to 7 Note - The mass in g/m shall be obtained by dividing the total mass of the reel by the linear length in meters. 6 MATERIAL The galvanized barbed wire shall be manufactured from mild steel wire conforming to IS 280. The galvanized coating shall conform to the requirements for any one of the type of coating as given in IS 4826 as per agreement with the purchaser. The coating requirements of electro galvanized wire shall conform to the requirements for any one of the type as given in IS 12753 as per agreement with the purchaser. 7 MANUFACTURE The barbed wire shall be formed by twisting together two line wires, one or both containing the barbs. The direction of twisting may be in one direction or alternately in left or right directions. The barbs shall be so finished that the four points are set and located or locked as far as possible at right angle to each other (see Fig. 1). The barbs shall be well formed, tightly wrapped and shall have a length of not less than 13 mm and not more than 18 mm. The point shall be sharp and cut at an angle not greater than 35o to the axis of the wire forming the barbs. 8 CHROMATING The barbed wire may also be given protective chromate conversion coating as per agreement with the purchaser. The shall conform to IS 1340. 9 FREEDOM FROM DEFECTS The line and point wires shall be circular in section, free from scales and other defects and shall be uniformly galvanized. Doc:MED 10( 0977)C 5 The line wire shall be in continuous lengths and shall not contain any welds other than those in the rod before it is drawn. The distance between two successive weldings in the line wire of finished barbed wire shall not be less than 15m. There shall be no splicing. 10 DESIGNATION A galvanized steel barbed wire of Type A and of size designation 1 shall be designated as: Steel Barbed Wire, A-1 IS 278 11 SAMPLING Unless otherwise agreed to between the manufacturer and the purchaser, the sampling plan as given in Annex A shall be followed. 12 TESTS Tensile Test The completed barbed wire and the line wire shall have minimum breaking load and tensile strength respectively as specified in Table 2. The test on the line wire shall be carried out in accordance with IS 1608. The method of testing the completed barbed wire shall be subject to agreement between the manufacturer and the purchaser. Table 2 Tensile Properties (Clause ) Size of Line Wire mm Tensile Strength of Line Wire N/mm2 Minimum Breaking load of completed Barbed Wire kN (1) (2) (3) 390 - 590 390 - 590 Zinc Coating Line Wire The galvanized coating shall conform to the requirements for any one of the type of coating as given in IS 4826 as per agreement with the purchaser. The coating requirements of electro galvanized wire shall conform to the requirements for any one of the type as given in IS 12753 as per agreement with the purchaser. Point Wire The point wire shall be tested only for mass of zinc coating and shall be tested before fabrication. The wire shall meet the requirements as laid down for medium coated wire in IS 4826 or IS Doc:MED 10 (0977)C 6 12753 subject to reduction of not more than 15 percent of the values specified there in. A total number of 5 barbs shall be employed for conducting the test and the points of the barbs shall be cut before subjecting them to the test. NOTES: 1. If wire is tested for uniformity as per IS 2633 after barbing, the requirement of preece test is to be reduced by one dip of half minute. 2. The preece test as per IS 2633 shall not be applicable in case of aged and weathered barbed wire. Ductility Test The line wire shall be subjected to the wrapping test in accordance with IS 1755. The line wire shall withstand wrapping and unwrapping eight turns round its own diameter without fracture. 13 MARKING Every reel of barbed wire shall be marked legibly with the name of the manufacturer, the type of barbed wire, the diameters of the line and point wires, barb spacing and length and/or mass of the reel. BIS Certification Marking Each reel of barbed wire may also be marked with BIS standard mark. The use of the standard mark is governed by the provisions of Bureau of Indian Standards Act, 1986 and the Rulers and Regulations made thereunder. The details of conditions under which a licence for the use of Standard Mark may be granted to the manufacturers and the producers may be obtained from the Bureau of Indian Standards. 14 COILING AND PACKING Unless otherwise agreed to between the supplier and the purchaser, the barbed wire shall be supplied in metal or wooden reels. Each reel of barbed wire shall be wound and fastened compactly. Doc:MED 10( 0977)C 7 ANNEX A (Clause 11) SCALE OF SAMPLING Lot All the reels of galvanized steel barbed wire of the same type and same designation manufactured under essentially similar conditions shall constitute the lot. For ascertaining the conformity of the lot to the requirements of the specifications, tests shall be carried out on each lot separately. The number of reels to be selected at random for this purpose shall be in accordance with Table 3. Table 3 Scale of Sampling (Clause ) Number of Reels in the Lot (1) Number of Reels to be Selected (2) Up to 25 3 26 to 50 4 51 to 150 5 151 to 300 7 301 and above 10 A-2 NUMBER OF TESTS AND CRITERIA FOR CONFORMITY All the reels selected according to shall be examined for diameter of line wire and point wire; distance between barbs length of barbs and freedom from defects. If all the reels are found satisfactory for each of the above characteristics, the lot shall be considered conforming to the requirements of these characteristics. When the lot is found satisfactory in , one test specimen each from every selected reel shall be taken and subjected to tensile test (see ), zinc coating test (see ) and ductility test (see ). The lot shall be declared conforming to the requirements of these characteristics if all the test specimens satisfy the relevant requirements. When so desired by the purchaser, one sample for the chemical analysis shall be drawn. The lot shall be declared conforming to the requirements when the test results satisfy the relevant requirements. The lot shall be declared conforming to the requirements of this specification, if it is found satisfactory according to to In case the lot is not found satisfactory according to to , then the lot shall be subjected to 100 percent retesting.

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