Spektr Group has successfully completed a comprehensive underground pipeline cleaning and integrity restoration project, aimed at eliminating internal contamination and restoring optimal flow efficiency within a carbon steel pipeline system.

The project involved a full-cycle technical scope including pipeline dismantling, internal inspection, multi-stage cleaning, system reassembly, and pressure testing to ensure reliable and safe operation.

Our engineering team carried out a series of specialized operations:

∙ Dismantling of selected pipeline spools to enable full access for cleaning

∙ Internal camera inspection to assess contamination levels

∙ High-pressure nitrogen gas cleaning

∙ Mechanical brush pigging using foam pigs

∙ High-pressure water jet cleaning of internal pipeline surfaces

∙ Final drying of the pipeline system

Multi-Stage Cleaning Process:

To achieve maximum cleaning efficiency, a combined dry and wet cleaning methodology was implemented.

Dry Cleaning Phase:

Foam pigs were introduced into the pipeline to mechanically remove accumulated deposits. As the pigs travelled through the line, continuous contact with the pipe wall helped loosen and mobilize internal buildup. This process allowed a large portion of the contamination to be dislodged and carried out of the system.

Wet Cleaning Phase:

For more stubborn deposits that remained after pigging, high-pressure water jetting was applied. The focused water stream effectively removed residual buildup and ensured deeper cleaning of the internal surfaces.

Post-Cleaning Verification:

Following the cleaning operations, the pipeline underwent a comprehensive camera inspection to verify the effectiveness of the cleaning process.

The inspection confirmed:

∙ Complete removal of internal deposits

∙ No visible cracks or structural defects

∙ No deformation or damage to the pipeline walls

∙ Satisfactory internal surface condition

After successful cleaning:

∙ The pipeline system was reassembled according to original design specifications

∙ All flanges, joints, fittings, and sealing elements were checked and aligned

∙ Torque settings were applied according to manufacturer standards

∙ Leak testing was performed using water

The pipeline was pressurized to 150 psi and held under pressure for 5 minutes with continuous monitoring, confirming the integrity and leak-free condition of the system.

Project Result:

The contamination removal operation was successfully completed, restoring pipeline flow efficiency and operational reliability.

Through a combination of advanced cleaning technologies, inspection methods, and strict engineering procedures, the pipeline system was returned to service in safe and stable condition.

Spektr Group continues to deliver high-precision industrial services, helping operators maintain the reliability, safety, and performance of critical infrastructure.