A vessel’s inert gas system is only as reliable as the piping, cabinet, and valves that carry and control it. At MI Solutions, our onboard team recently completed a full N2 padding and purging system installation on an offshore support vessel, from feasibility study through to pressure testing and ABS class approval, delivered in 30 days. This article breaks down the commissioning process and the standard our marine mechanical service team applies to every inert gas system job.
From the first piping model to the final pressure hold, this is what a properly commissioned N2 system looks like when class approval and vessel safety are on the line.
Job Parameters at a Glance
The N2 padding and purging system was commissioned on an offshore support vessel, delivered end-to-end by MI Solutions’ in-house onboard team:
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Vessel Type: Offshore Support Vessel
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Timeline: Fully Commissioned in 30 Days
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Test Result: 6.5-Hour Hold at 9.5 Bar, Zero Leaks
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Certification: ABS Class Approval Obtained
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The Commissioning Process, Phase by Phase
MI Solutions executed the N2 padding and purging system commissioning in four stages, each managed by our in-house onboard team with one point of contact from design through to handover.
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Phase 1
Feasibility Study & 3D Piping ModelBefore any fabrication began, MI Solutions’ engineering team carried out a full feasibility study for the nitrogen inerting system, mapping routing constraints and integration points against the vessel’s existing deck layout. A 3D piping model and fabrication-ready spool drawings were then developed, giving the fabrication team an exact, class-ready blueprint before a single pipe was cut. |
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Phase 2
Piping Fabrication & InstallationWorking from the approved spool drawings, MI Solutions’ fabrication team cut, fitted, and welded the nitrogen piping runs, then installed them across multiple deck sections in line with the 3D model. Each run was checked against the design for correct routing, support, and clearance before moving on to cabinet and valve integration. |
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Phase 3
Cabinet Build & Valve IntegrationA custom-built N2 cylinder cabinet was fabricated with structural reinforcement and ventilation, giving the system a secure, properly vented home on deck. Full valve and fitting integration followed, including pressure relief valves, ball valves, needle valves, and pressure indicators, each connected and set to specification. |
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Phase 4
Pressure Testing & CommissioningThe completed system was put through a 6.5-hour pressure hold at 9.5 bar, confirming zero leaks across every joint, valve, and connection point. With the hold test passed, the system was formally commissioned and submitted for class review, resulting in ABS approval for the completed installation. |
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The Result
Class-Approved N2 System, Ready for ServiceFrom feasibility study to final commissioning, the N2 padding and purging system was designed, fabricated, installed, and tested without incident, holding 9.5 bar for 6.5 hours with zero leaks. Delivered in 30 days with 100% in-house skills and full ABS class approval, this is the standard MI Solutions applies to every inert gas and piping system job across Africa and the Middle East. |
Related Services from MI Solutions
N2 padding and purging system installation frequently sits within a wider piping, fabrication, and instrumentation scope. MI Solutions provides all of the following under one roof, with one point of contact and no subcontracting delays:
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Marine Mechanical
Piping Systems & Valve ServicingFrom N2 system design to full valve overhaul, MI Solutions’ marine mechanical engineers cover piping fabrication, valve servicing, and pressure system commissioning. |
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Welding & Fabrication
Custom Cabinet & Structural FabricationWhere a project calls for a custom-built enclosure or reinforced structure, MI Solutions’ welding and fabrication team handles structural steel work and precision welding to class requirements, onboard or in-house. |
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Marine Hydraulics
Pressure Testing & Instrumentation SupportAlongside inert gas system commissioning, MI Solutions’ marine hydraulics team supports pressure testing, control valve calibration, and instrumentation across all major manufacturers. |
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Marine Spare Parts
Valves, Fittings & Cylinder Spares, Fast Supply to PortNeed PRVs, ball valves, or cylinder cabinet spares delivered to your vessel? As one of the most reliable marine spare parts suppliers in the UAE, MI Solutions sources and delivers class-approved components direct to port alongside the service team, across Africa and the Middle East. |
Need an N2 System or Piping Project Done? Contact MI Solutions
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