tower all parts (Legs, crossarms, joints) shall be made of rolled steel with minimal shearing strength not less than 42 Kg/mm2, and the minimal elasticity strength not less than 24 kg/mm2 for all tower types (NR, NW, NY, SR, SW, SX, SY) and shall comply with the latest norms and standards for similar applications.
Parts shall attend the acceptance tests listed in the international standards e.g. (IEC), ASTM (AISC) or any other equivalent standards
All nuts, bolts, screws and washers, etc. shall be made of steel grade (56) and hot deep galvanized.
Steel angles, and sheets shall be cut, perforated mechanically (shearing, sawing, blades, etc.)
Using heating (torch) to cut, perforating the steel is not allowed/forbidden
Screws length shall be enough, minimum two thread above the bolts after installation.
Threaded length of the screw shall be limited in a way the unthreaded part shall reach the edge of assembled parts tighten together by using plain washers.
All bolts will be locked by using spring washers type GROWER, in addition of plain washers, using welding and rivets is forbidden
Tower parts (Legs, crossarms, joints etc.) shall be hot deep galvanized in compliance with latest standard (ASTM) or similar approved norms. Hot Deep Galvanize surface weight shall not be less than 600 g/m2
Tower legs shall be equipped with earthing clamp (connection) to connect earthing conductor made of steel cross section 50mm2 with grounding system.
Tower parts shall be clearly coded (numbered) with unique reference made of numbers and letters.
Parts numbers (codes) shall be printed (carved) before galvanization and to remain clearly readable after galvanization.
The technical proposal to include the following
Towers Technical Specifications
Name of Manufacturer
Country of Origin
Standard followed for steel manufacturing
Tower steel grade (ST42)
Minimal shearing strength for tower parts ≥ 42 kg/mm2