066 : 1998 CEB STANDARD GALVANIZED IRON PIPES FOR SERVICE CONNECTIONS CEYLON ELECTRICITY BOARD SRI LANKA

Size: px
Start display at page:

Download "066 : 1998 CEB STANDARD GALVANIZED IRON PIPES FOR SERVICE CONNECTIONS CEYLON ELECTRICITY BOARD SRI LANKA"

Transcription

1 066 : 1998 CEB STANDARD GALVANIZED IRON PIPES FOR SERVICE CONNECTIONS CEYLON ELECTRICITY BOARD SRI LANKA

2 Specification for GALVANIZED IRON PIPES FOR SERVICE CONNECTIONS CEB Standard 066 : 1998 CEYLON ELECTRICITY BOARD No. 50, Sir Chittampalam A. Gardiner Mawatha, Colombo 2. Sri Lanka Telephone: Telex : CE Facsimile: cedp@mega.lk

3 AMMENDMENT TO CEB STANDARD 066 : 1998 (Revised September 98) SPECIFICATION FOR GALVANIZED IRON PIPES FOR SERVICE CONNECTIONS TENDER FOR THE SUPPLY AND DELIVERY TENDER NO : MMP/T/D/98/42 REVISED TEXT 1. Clause No. 5.8 Galvanizing The first word in the last raw of the paragraph copper should be read as Zinc. The word in the last raw of the paragraph less than should be read as not less than 2. Clause No. 8.0 INFORMATIION TO BE SUPPLIED WITH THE OFFER The word in the third sub clause conforming should be read as conforming. 3. The Drawing No. DS&S-66/1/98 wherever mentioned in the Specification should be amended as Drawing No. CEB/DS&S/66-2/1998

4

5 CONTENTS PAGE NO. 1. General 2 2. Design Loadings 2 3. Standards And Codes Of Practice 2 4. Materials Construction 3 6. Minimum Technical Requirements 4 7. Additional Requirements 5 8. Information To Be Supplied With The Offer 5 9. Inspection And Testing Sample Annex 6 1

6 SPECIFICATION FOR GALVANIZED IRON PIPES FOR SERVICE CONNECTIONS 1.0 GENERAL This Specification covers fabrication, galvanizing and testing of Iron Pipes used as Tubular Service Connection Poles. 2.0 DESIGN LOADINGS The Fabricated Tubular Iron Pole shall be able to withstand a load of 50 kgf (Tension) as the Pole Top loading in all directions, applied at a distance of 0.6 Metres from the top of the pole. 3.0 STANDARDS AND CODES OF PRACTICE Unless otherwise specified, the materials and workmanship specified under this Specification shall conform to the latest version of the appropriate British Standards. In particular to: 4.0 MATERIALS BS Part 1: Seamless Welded Tubes BSEN Hot finished structural hollow section BS Hot Dip Galvanised Coating on Iron & Steel Article The tubular pole shall be constructed with steel of grade S 235 JRH or any other higher grade of steel used in the fabrication of hollow structures. The flat iron used in the fabrication of "D" bracket shall conform to BS and BS or any other hitherto. The chemical properties and mechanical properties of steel shall be in accordance with BSEN and BS or any other standard hitherto. 2

7 5.0 CONSTRUCTION 5.1. Tubular Pole The steel used in the manufacture of tubes shall be of grade S 235 JRH or any other higher grade conforming to the British Standards given in Clause 3.0 of this specification. The tubes used in the construction of service poles shall be seamless. However, spirally or longitudinally welded tubes are also acceptable. The tubular pole and its components shall be constructed as per Drawing No. DS&S /98 given in Annex B, using steel of grade S 235 JRH. The Steel used shall satisfy all the requirements under BSEN No welding or threading arrangements with unions to maintain the length of the pole is acceptable. The full length of the pipe inclusive of the end seal, given in 5.2 below, may also be of either centrifugal casting or produced by extrusion from the parent metal. 5.2 End Seal The top end of the pole shall be sealed from ingress of moisture by completely welding to size with a sheet steel of same grade as that of the pole or any other suitable arrangement, using metal. Usage of PVC or any other non-metal component to seal the top end of the pole is not acceptable. Refer Drawing No. DS&S-66-2/98 given in annex - B of this Specification, for constructional features. 5.3 "D" Bracket This is constructed as per Drawing No. DS&S /98 given in Annex B using flat iron specified under BS and BS Anchoring Device This is constructed as per Drawing No. DS&S /98 given in Annex B. M.S. Bar used for Anchoring shall be welded to the Pipe in the same plane as that of the "D" Bracket. 3

8 5.6 Welding of "D" Bracket to service Pole This is constructed as given in Drawing No. DS&S /98 given in Annex B. The "D" bracket so fabricated as in Clause 5.2 above shall be welded to the Tubular Pipe in the same plane as that of the M.S. Bar used for Anchoring of the Tubular Pole. The welding shall have a good finish to prevent accumulation of water between the welding and the metal interfaces. Strength of welding shall be able to hold the "D" bracket to the constructed tubular pole without detaching from same for a load greater than 200kgf. The structure so fabricated as above shall be first cleaned by sand blasting, necessary holes drilled, cut into required size and necessary sheet metal working welding etc. carried out before galvanizing. 5.7 Finish All components shall be smooth, with corners rounded and free from sharp edges. All burrs shall be removed after shearing, drilling or punching. The galvanizing on all items shall be smooth, continuous, uniform and free from flux stains. Holes shall be free from nodules of pelter. 5.8 Galvanizing The complete fabricated structure shall be hot dip galvanized conforming to BS 729, and treated with Sodium Dichromate or Pelter W20 Solution immediately after galvanizing to prevent the formation of white rust. The preparation for galvanizing itself shall not distort the mechanical properties of material. All components shall be effectively galvanized to give a uniform Zinc coating of not less than 610 grams of copper per square meter of surface ie uniform thickness less than 0.086mm. 5.9 Design Drawings The design and dimension of the structure and relevant components are as shown in the Drawing No. DS&S - 66/2/98 given in Annex B of this text. 6.0 MINIMUM TECHNICAL REQUIREMENTS Quality of steel for pipe - S 235 JRH Length of pipe M External diameter mm Wall thickness - not less than 3.4 mm. The grade and chemical composition of steel shall be S 235 JRH which is accordance with BSEN (1994) and BS Accordingly the minimum tensile strength of steel shall be 389 Newton per mm². 4

9 7.0 ADDITIONAL REQUIREMENTS 1. Marking Manufactures identification mark and the letter CEB shall be impressed on the finished product (tubular pole) at a height not less than 3.0 m from the Anchored end of the Pole. 2. Packing The complete galvanized structure shall be bundled together using GS wire, each bundle having 100 Nos. of items. A label indicating the name and quantity of the item shall be fixed to each bundle. 8.0 INFORMATION TO BE SUPPLIED WITH THE OFFER 1) Test certificate for the steel used in the fabrication of items offered conforming to BS ; BS ) Test certificate for galvanizing conforming to GS 729 from an independent testing authority acceptable to CEB. 3) Test Certificate conforming the strength of welding 4) The constructional drawings and details of Section A and B as shown in Drawing No. DS&S - 66/2/98 given in Annex B of this text. 5) Sample as per Clause No. 11 of this Specification. Failure to furnish the above particulars will result in this offer being rejected. 9.0 INSPECTION AND TESTING The selected tenderer shall make necessary arrangements for inspection by an Engineer appointed by the CEB for carrying out the following tests in his presence a) Visual inspection as per clause 9 and 12.3, tensile test as per clause 8.1, 12.2 and 13.1, flattening test or bend test as per clause 8.1, 12.2 and 13.2 of BS 3602 Part b) Elongation c) Galvanizing and to check the Dimensions, Tolerance, Finish and formation of White Rust. 5

10 10.0 SAMPLE One sample (non returnable) shall be supplied. The length of the sample shall be of any length not less than 0.5 m so as to include the "D" bracket welded portion of the Tubular Pole. Late sample shall not be acceptable Annex Schedule of Particulars (Annex A) Constructional features - Drwg. No. DS&S - 66/2/98 (Annex B) 6

11 Annexure - A SCHEDULE OF PARTICULARS 1. Grade of Steel - 2. Mechanical Properties of steel a) Minimum Tensile strength - b) Minimum Yield strength - c) Minimum Elongation - 3. Whether the grit blast facilities available for rust freeing the steel sections - 4. Galvanizing a) Thickness of galvanized coating in any area - b) Weight of galvanized coating per square meters - 5. Country of Origin for Steel Hardware Components - 6. Chemical Composition of the Steel used - (furnish mill s certificate) 7. Thickness of the Pipe - 8. Diameter of the Pipe a) Internal b) External 9. Whether the Top End Seal is provided Detailed Dimensional Drawing of the Pipe SEAL AND SIGNATURE OF THE BIDDER/MANUFACTURER Date pipe 7

12