Supply, Fabrication and Erection of MS Structural Racking System in West Bay (Civil Grid Nos. 11 to 16), DUOSF, INRP Kalpakkam

Supply and fabrication of Mild Steel (MS) structural modules for an Engineered Rack System, designed for transportable erection at the site. It includes four modules, each weighing approximately 4 MT, totalling 16 MT (Approximately), fabricated as per approved drawings (Ref No: DUOSF(K)/318/20052024/1,2,3 OF3). The scope covers procurement of IS 2062 Grade "B" and IS:808-compliant MS structural steel and other materials, preparation of fabrication drawings based on General Arrangement (GA) drawings, and approval of fabrication sequences, Quality Assurance Plans (QAP), and Non-Destructive Testing (NDT) procedures. The process involves material qualification, identification, marking, flame cutting, mechanical cleaning via shot blasting, application of primer coats, SMAW welding, alignment, flush grinding of welded joints, Liquid Penetrant (LP) examination, spray painting as per specifications, and coating thickness checks. Interim safe storage is arranged for site erection, followed by submission of as-built drawings and QA reports.

Erection of fabricated MS structural rack modules at the site involves a systematic process starting with planning rigging operations for transporting components from the storage yard at INRP-Kalpakkam to the site in sequence. The modules are then placed at designated locations, with temporary supports or restraints provided for preliminary alignment. Fit-up and welding activities include GTAW welding for root passes and SMAW welding for fill-up passes on column-to-base plate joints and other connections. Quality assurance measures include 100% Dye Penetrant Testing (DPT) for column-to-base plate final passes and 10% DPT for other joints. Final alignment, painting at weld or leftover areas, and coating thickness measurements are conducted to ensure compliance with specifications. All tools, tackles, and material handling equipment, such as cranes of suitable capacity. are supplied by the contractor