1. Power Generation Sector Used extensively for the preservation of HP/LP heaters, deaerators, desuperheaters, drain coolers, and gland steam condensers during long outages. Continuous nitrogen blanketing prevents oxidation of tube bundles and internal surfaces. The system’s two-stage control allows steady nitrogen output for months without manual re-pressurisation. 2. Petrochemical and Refinery Operations Provides nitrogen for blanketing, purging, and inerting during plant maintenance or process transitions. Its dual-stage regulation ensures smooth pressure control even when multiple reactors or pipelines are connected in parallel, reducing risk of oxygen ingress or vapour ignition. 3. Aerospace and Defence Applications Ideal for inert charging of actuators, hydraulic accumulators, and gas bottles, and for long-term storage of sensitive assemblies. The rugged design and BHEL/PED compliance make it suitable for hangars, test bays, and ammunition facilities where accuracy and operator safety are non-negotiable. 4. Cryogenic and Research Facilities Ensures a clean, dry nitrogen atmosphere for purging cryogenic transfer lines, instrument test loops, and vacuum chambers. Components such as SS316 trims and precision regulators guarantee gas purity even under temperature variations. 5. General Industrial Preservation Used in chemical plants, fertilizer units, and heavy machinery shops to maintain equipment in a non-corrosive, moisture-free state during storage or commissioning delays. Integration with automated purge and vent manifolds enables unattended operation.
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Introduction 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. More than a gas distribution skid, this system represents an intelligent fusion of multi-stage self-actuated regulation, robust mechanical design, and operational safety. Every detail—from its carbon-steel manifolds and dual safety valves to its ergonomic frame layout—has been optimized for reliability and serviceability in demanding field conditions. The result is a plug-and-operate nitrogen control unit capable of maintaining large-scale preservation networks for months or years without degradation or manual intervention. 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. 1. 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 pressurization and replacement cycles. 2. 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. 3. 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. 4. 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. Technical Specifications
