ONGC PETRO ADDITION LTD. - 2016-2017

• Fabrication  &
  Erection of AG unit
  Piping Work.

• Fabrication & Erection of AG (Above Ground) Unit Piping Work

• Fabrication refers to the cutting, shaping, and assembling of pipes in a controlled environment, usually a workshop.

• Erection involves the installation and alignment of prefabricated pipe sections at the actual site location.

• AG Unit Piping stands for Above Ground piping systems used to carry liquids or gases across industrial units without underground laying.

• All work is done according to P&ID (Piping and Instrumentation Diagrams) and isometric drawings approved by the engineering team.

• Materials typically include Carbon Steel (CS), Stainless Steel (SS), and Alloy Steel depending on the fluid type and temperature.

• Pipe spools are fabricated by cutting, beveling, and welding of elbows, tees, reducers, and flanges to the required specification.

• A fit-up inspection is conducted before welding to ensure correct alignment and gap tolerance.

• Welds are done as per Welding Procedure Specification (WPS) using qualified welders under strict supervision.

• NDT (Non-Destructive Testing) such as radiography or dye penetrant tests is done to ensure weld quality.

• After fabrication, spools are hydrotested (or pneumatically tested) to verify pressure integrity.

• Fabricated spools are transported to the site with care using rigging tools and lifting equipment.

• Site erection includes lifting, placing, and aligning the spools using cranes, chain pulleys, and jacks.

• Pipe supports, hangers, and guides are installed to accommodate thermal expansion and load-bearing.

• Final welds and connections are made on-site with high precision and safety compliance.

• The pipeline is then flushed and cleaned using air, water, or chemical flushing as per the service type.

• After installation, another hydrotest is performed to ensure there are no leaks under pressure.

• All erection and welding activities are logged in inspection reports, test certificates, and handover documents.

• Throughout the process, safety protocols like PPE, scaffolding, and permits are strictly enforced.

• Coordination with civil, electrical, and instrumentation teams is crucial to avoid clashes.

• The final system is commissioned, ensuring it is ready for operational use with proper documentation and client approval.