Nitrogen Cylinder Manifold & Pressure Control System, self‑regulated to 3 kg/cm² g.

Why nitrogen preservation matters

In heavy-industrial and power-generation environments, one of the greatest challenges during equipment shutdowns is preventing corrosion and contamination of critical systems. Moisture and oxygen entering idle components — such as heat exchangers, condensers, or steam lines — can initiate oxidation and internal scaling within days. Over time, this leads to costly maintenance, reduced life expectancy, and unsafe operating conditions.

To counter this, Neometrix Defence Limited engineered the Nitrogen Cylinder Manifold Cum Pressure Control System, a high-precision assembly that maintains a stable flow of pure, dry nitrogen for equipment preservation. Nitrogen’s inert nature makes it ideal for creating a moisture-free atmosphere inside process circuits, effectively displacing oxygen and halting corrosion.

1. System description

The manifold system integrates eight cylinder banks, each interlinked through high-pressure piping, control valves, and safety devices. Nitrogen from the cylinders is channelled through a two-stage regulation and distribution circuit that ensures consistent outlet pressure regardless of cylinder depletion rate.

Cylinder Manifold Assembly

• Accommodates 360 cylinders (47 L each) arranged in eight banks of 45.
• Manifolds constructed from seamless carbon-steel A106 Gr B (SCH 160) pipes with ANSI #1500 flanged ends.
• Each cylinder connects via flexible pigtails with bull-nose fittings conforming to IS 3224, enabling rapid installation and maintenance.
• Cylinders are secured using chain-and-hook locking assemblies and supported by a heavy-duty IS 2062 steel framework, ensuring stability during pressurisation and replacement cycles.

Two-Stage Pressure Regulation and Control

• Stage I regulator reduces incoming cylinder pressure (up to 160 kg/cm² g) to an intermediate level (~15 kg/cm² g) using a self-actuated control valve with integrated pressure relief protection.
• Stage II regulator further refines the outlet to ~3 kg/cm² g for stable downstream supply.
• Each stage is protected by independent safety relief valves (set at 18 kg/cm² g and 3 kg/cm² g respectively).
• Y-type strainers remove particulates, safeguarding precision valves and instrumentation.
• Isolation and throttling handled by flanged ball and globe valves (ANSI 1500#) for maximum durability and sealing integrity.

Instrumentation and Monitoring

• Equipped with Bourdon-type pressure gauges (0–210, 0–28 and 0–10 kg/cm² g ranges) housed in SS316 cases with 100 mm dials.
• Two-way manifold blocks permit dual isolation and calibration under live pressure.
• All instruments are tagged, earthed, and provided with stainless-steel nameplates for traceability and compliance with QA documentation standards.

Structural Frame and Support

• Frame fabricated from ISMC 100×50×6 mm channels and rectangular MS tubes 100×50×3 mm, designed to bear the combined static load of 360 charged cylinders.
• Integrated foot supports and base plates simplify foundation alignment on site.
• Surfaces finished with zinc-rich epoxy primer and polyurethane topcoat, providing exceptional resistance against weathering and industrial contaminants.

2. Quality and compliance

Fabrication and testing follow Neometrix’s ISO 9001/14001/45001-certified processes, with every stage documented under an approved Quality Assurance Plan (NX/QAP/A8422).

Key checks include

• Material chemical and mechanical verification with traceable MTCs.
• Hydrostatic and leak tests on each pressure line.
• NDE inspection (LPI / MPI) on critical welds and fittings.
• Dimensional and functional validation against approved GA and P&ID drawings.

All fabrication personnel are ASME Section IX / EN ISO 9606-1 qualified, and inspections are witnessed by BHEL QA representatives. The final data dossier includes calibration certificates, test reports, and inspection release notes, ensuring full transparency and regulatory compliance.

Manufactured in accordance with BHEL Specification PY-53040 Rev 00 and Pressure Equipment Directive 2014/68/EU, the system guarantees total conformity with international safety and performance standards. Approved components are sourced from qualified manufacturers — including Nirmal, Samson, Asian Industrial Valves, and A.N. Instruments — for long-term erosion and corrosion resistance in critical valves and instrumentation.

Conclusion

The Nitrogen Cylinder Manifold Cum Pressure Control System embodies Neometrix’s engineering precision and commitment to reliability. With dual-stage self-regulation, redundant safety architecture, and robust mechanical design, it ensures long-term corrosion protection and operational readiness for critical assets. Whether installed in a thermal power plant, refinery, or aerospace test facility, it delivers unwavering performance — keeping systems dry, safe, and ready for service.