Project Snapshot: A Race Against Time at the Railway’s Core
| Client: | Southwest Products Pipeline Authority |
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| Location: | Zhanjiang, Guangdong Province, China |
| Core Challenge: | Relocating a live, high-pressure (3.2MPa) φ406.4mm products pipeline running directly beneath the critical “throat zone” of the new Guangzhou-Zhanjiang High-Speed Rail station. Traditional shutdown was economically and socially unacceptable. |
| Our Solution: | A bespoke Four-Plug, Three-Tap, Double Bypass hot tapping and plugging procedure, enabling the full isolation and removal of a 5.75km pipe section without a single minute of shutdown. |
| Key Results: | ✅ Zero production interruption or revenue loss ✅ 100% of 760m³ products safely recovered ✅ Zero safety or environmental incidents ✅ Project completed within 7-day critical window |
The Challenge: A Live Artery Beneath a National Priority
The construction of the Zhanjiang North Station is a pivotal node in China’s national high-speed rail network. However, a major obstacle lay directly in its path: the Southwest Products Pipeline, a crucial energy artery supplying refined fuels across the region.
This was not a simple dig-and-replace operation. The client faced a perfect storm of constraints:
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The Astronomical Cost of Shutdown: A traditional pipeline shutdown for cut-out would trigger regional supply chain disruption and revenue losses estimated in the millions of dollars per day. This was not an option.
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Extreme Safety and Environmental Risk: The 5.75km section to be abandoned contained approximately 760 cubic meters of refined oil. Performing “hot work” on a live line in an urban-adjacent area, near a major construction site, presented an unthinkable risk of fire, explosion, or environmental contamination.
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Unforgiving Logistics and Timeline: The high-speed rail project’s schedule was immutable. The worksites were constrained, located near Xicheng Expressway and residential areas, demanding surgical precision and flawless execution.
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Complex Technical Specifications: The pipeline, constructed of X60 steel with a wall thickness of 7.1mm, operated at 3.2MPa. All work—including welding, tapping, and plugging—had to be performed under pressure, pushing the limits of equipment and engineering expertise.
The client’s mandate was unequivocal: Find a contractor capable of executing a pipeline relocation with absolute safety, zero operational downtime, and guaranteed on-time delivery.
Our Engineered Solution: The Surgical Precision of Pressure Isolation
We responded not with a generic service proposal, but with a meticulously engineered Pressure Isolation and Bypass (PIB) Plan, tailored to this project’s unique DNA. Our solution, known in the field as a Four-Plug, Three-Tap, Double Bypass setup, is the industry’s gold standard for high-consequence in-service pipeline repairs.
Technical Breakdown & Client-Centric Benefits:
Phase 1: Precision Tapping & Bypass Installation
Using specialized DN406 hot tapping machines, we expertly installed pressure-containing fittings and created openings in the live pipeline upstream and downstream of the work zone. This allowed us to install a temporary bypass loop, rerouting the product flow around the section slated for removal.
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Client Benefit Translated: Immediate site access for the rail construction team. The critical path for the station’s foundation work was cleared the moment the bypass was commissioned, decoupling our pipeline work from their schedule and de-risking the entire megaproject.
Phase 2: Double-Block Isolation & Product Recovery
The core of pipeline isolation plugging. Through the installed fittings, we inserted and set bi-directional sealing plugs at four critical points, creating two isolated double-block barriers. The entire 760m³ volume of product in the isolated 5.75km segment was then safely transferred to the new pipeline and tankers using a closed-loop recovery system.
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Client Benefit Translated: Turned an environmental liability into recovered asset value. We didn’t just “manage” the product—we quantified and returned it. This direct financial recovery, documented in our reports, offset project costs and transformed a risk into a tangible return. Our focus on full-bore plugging ensured no debris or restrictions were left in the mainline.
Phase 3: Ultimate Isolation & Tie-In
With the pipe segment completely evacuated, we injected specially formulated sealing gel (butterfly walls) at the cut locations for secondary safety. The isolated, inert segment was then cold-cut and removed. The new, heavier-walled (9.5mm, X60M) pipeline was finally tied in with full-complement welding procedures.
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Client Benefit Translated: Transformed a high-risk “hot work” activity into a controlled “cold work” task. By the time cutting began, the pipe was as safe to work on as a new one in a yard. This meticulous, phased approach is what allows us to guarantee zero fire incidents in our projects.
Execution: Where Methodology Meets the Field
From September 18 to 24, 2024, our certified field team executed the plan with military precision. Our project management excellence was evident in every detail:
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Pre-Job Engineering & Pressure Management: We coordinated with pipeline controllers to strategically lower the operating pressure to a optimal 2.8MPa for the welding and tapping phases, maximizing safety without affecting downstream supply.
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Equipment & Expertise: We deployed full-size, pressure-rated hot tap and plugging equipment from leading manufacturers, specifically calibrated for the φ406.4mm diameter and X60 material. The crew was led by a Senior Plugging Specialist with over two decades of field experience in crude oil pipeline maintenance.
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Critical Path Timeline:
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Site Mobilization & NDT: Ultrasonic testing confirmed wall thicknesses at all work points.
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Fitting Welding: Full-encirclement split-sleeves and reinforced tapping tees were welded by ASME-certified welders, with 100% radiographic inspection.
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Sequential Tapping & Bypass Commissioning: Each tap was performed, tested, and the temporary bypass loop was pressurized and brought online.
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Plugging & Product Transfer: Plugs were set and the 760m³ product was transferred under continuous monitoring.
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Safe Cut-Out & Final Tie-In: The isolated segment was removed, and the new pipeline was connected.
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System Restoration & Testing: Plugs were retrieved, the bypass was decommissioned, and the line was returned to full service, followed by a 24-hour hydrostatic test of the new section.
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Quantifiable Results & Lasting Value
The success of this high-pressure pipeline intervention is measured in hard data and client confidence:
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100% Operational Uptime: The pipeline never stopped flowing. The client avoided all losses associated with a shutdown, preserving their reputation for reliable supply.
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Complete Product Recovery & Zero Emissions: All 760m³ of refined products were accounted for and transferred. The project achieved a zero hydrocarbon release goal.
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Flawless Safety Record: No recordable injuries, no fires, and no environmental non-conformances—a testament to our “Safety First” engineering culture.
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On-Time, On-Budget Delivery: All critical milestones were met within the tight 7-day window, ensuring the national rail project faced no delays from our scope of work.
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Enhanced Infrastructure Integrity: The new pipeline section, with its upgraded 9.5mm wall thickness and X60M material, provides increased safety margins and longevity for the operator.
“Faced with a seemingly impossible task of relocating a critical pipeline under a live railway site, JSW delivered a textbook-perfect execution. Their hot tapping and plugging plan turned our biggest risk into a non-event. Their expertise wasn’t just technical; it was in understanding and protecting our commercial and operational priorities every step of the way.”
— Project Director, Southwest Products Pipeline Authority
Ready to Discuss Your Critical Pipeline Project?
If you are planning a pipeline relocation, repair, or modification where shutdown is not an option, our proven hot tapping and plugging services are your strategic solution. Contact our engineering team today for a confidential consultation.
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