69kv Steel utility pole ASTM A 123 Metal post hot dip galvanizing

1.0 SCOPE

These specifications cover the design, engineering, manufacture, assembly, testing at manufacturer's works before dispatch of steel poles, cross arm assemblies, guy sets, danger plates, GI spike earthing sets for 33kV Single pole line, Suspension and Tension Fittings suitable for AAC Conductor for use on 3 phase, 50 Hz, solidly earthed 33kV Overhead lines.

• The design and workmanship shall be in accordance with the best engineering practices to ensure satisfactory performance throughout the service life.
• Any material and equipment not specifically stated in this specification but which are necessary for satisfactory operation of the equipment shall be deemed to be included unless specifically excluded and shall be supplied without any extra cost. Components having identical rating shall be interchangeable. The bidder has to furnish the testing facilities available at the manufacturer’s works.

Whenever there is a difference in the Standards the most stringent criteria shall apply.

3.0 MATERIALS, CONSTRUCTIONAL DETAILS AND WORKMANSHIP

• Materials used in the manufacture of all the equipment shall be new and best quality and class most suitable for performance under the specified conditions.
• Steel used for manufacture of various equipment shall be in conformity with the general requirements relating to the supply of materials laid done in relevant international standards.
• The material analyzed in accordance with ISO 13520:2015 or other relevant international standard shall not show sulphur and phosphorous contents of more than 0.060% each.
• Equipment shall be well-finished, clean and free from harmful surface defects. Ends of steel poles, angle sections etc. shall be cut square and shall be straight.
• The bolts, nuts & pack washers and guy wire strand & cross arm guard wire shall be hot dip galvanized as per ISO 1461:2009(en) or other relevant international standards. The quality of zinc shall be at least Zn 98 grade specified in ISO 752:2004. The zinc coating shall be adherent, smooth, reasonably bright, continuous and free from such imperfections and flux, ash and dross, inclusions, flake and black spot, pimples, lumpiness and runs.
• The steel poles shall be hot dip galvanized with minimum 125 micron thickness of zinc coating and steel base plates with minimum 125 micron thickness of zinc coating generally as per ASTM A123 and tested as per relevant international standards..
• The articles shall withstand minimum 4 dips of one minute duration. The uniformity of galvanized coating shall be determined by the preece test as prescribed in ASTM A123.
• Suspension and Tension Fittings shall be made of Aluminum Alloy and all nuts and bolts shall be made of hot dip galvanized steel with minimum thickness of zinc coating of 85 micron as per ISO 10684:2004(en) Part XIII or other relevant international standards.

4.1.1.11 Design Parameters and Factor of Safety

Tolerances

i. Length

The tolerance on the length shall be as follows:

The finished pole shall not be out of straightness by more than 1/600 of its length.

The rolling and cutting tolerance for hot rolled steel products shall be in accordance with relevant international standards.