How Cryogenic Oxygen Nitrogen Gas Plants Work: Insights from Sanghi Overseas

In industries requiring a steady, high-purity supply of oxygen and nitrogen — such as metal production, fabrication, chemical processing, pharmaceuticals, electronics, food & beverage, and more — on-site cryogenic generation ensures reliability, precise quality control, and significant long-term cost savings compared to external cylinder or bulk supplies.

Sanghi Overseas is the dedicated export house of Sanghi Organization, an independent Indian manufacturer with its own production facility near Mumbai. Sanghi Organization designs and builds the plants, while Sanghi Overseas handles all international sales, delivery, commissioning, and support.

This guide explains the cryogenic air separation process step by step and highlights why plants manufactured by the Sanghi Organization (exported via Sanghi Overseas) are trusted for long-term performance and efficiency.

The Cryogenic Process – Step by Step

Sanghi ORG oxygen nitrogen gas plants produce high-purity gases by liquefying atmospheric air at cryogenic temperatures and separating oxygen and nitrogen through fractional distillation based on their boiling points (oxygen –183°C, nitrogen –196°C).

• Air Compression Filtered ambient air is compressed to a medium pressure of 32–35 kg/cm² using reliable, efficient compressors.
• Purification Compressed air passes through a twin molecular sieve system that removes moisture, CO₂, hydrocarbons, acetylene, and other impurities to ensure clean air enters the cold box.
• Cooling in Heat Exchangers Purified air flows through high-efficiency aluminium plate-fin heat exchangers in the insulated cold box, where cold waste nitrogen and product gases provide regenerative cooling and energy recovery.
• Refrigeration via Expansion Engine A portion of the air expands in a highly efficient expansion engine, creating the deep refrigeration required for liquefaction while contributing to low overall power use.
• Distillation in Double Columns Liquefied air enters the high-pressure and low-pressure distillation columns. Nitrogen (more volatile) is collected from the top; oxygen is withdrawn from the bottom — both at high purity.
• Product Recovery and Delivery Gases are warmed to ambient temperature in the heat exchangers and supplied as pipeline gas. The integrated cryogenic liquid oxygen pump (standard feature) allows direct high-pressure cylinder filling (up to 200 kg/cm²) or optional liquid production for storage.

The plant supports continuous industrial operation. After periodic defrost cycles (typically every 8–12 months), it reaches full production in about 8–10 hours.

Typical piping and instrumentation diagram of a cryogenic oxygen nitrogen gas plant manufactured by Sanghi Organization

Why Sanghi Organization Plants Deliver Superior Performance

Sanghi Organization cryogenic oxygen nitrogen gas plants are built for durability, low operating costs, and extended service life:

• Medium-pressure design (32–35 kg/cm²) for reduced power consumption
• Efficient expansion engine providing excellent refrigeration and energy recovery
• Robust cold box and column construction proven to last decades in heavy-duty applications
• Compact layout with integrated cylinder filling capability
• Simultaneous production of 99.6% oxygen and high-purity nitrogen (up to 99.9999% with modifications)
• Specific power consumption as low as ~1.0 kWh per m³ of oxygen for capacities of 250 m³/hr and above

Many Sanghi Organization plants installed 20–30 years ago remain in reliable service today, demonstrating exceptional engineering quality compared to other industrial gas plant manufacturers.

Example installation of a Sanghi cryogenic oxygen nitrogen gas plant – compact and engineered for continuous operation

Why Customers Choose Sanghi Overseas

Sanghi oxygen nitrogen gas plants provide:

• Consistent high-purity output for critical processes
• Strong ROI through energy efficiency and minimal downtime
• Comprehensive after-sales support with original spares and service, even for older plants

For projects in India, contact the Sanghi Organization directly. For international/export needs, Sanghi Overseas offers end-to-end assistance.

Explore detailed specifications, capacities, and options:

Oxygen/Nitrogen Gas Plant Manufacturer

Frequently Asked Questions

What is the main advantage of cryogenic oxygen nitrogen gas plants?

Cryogenic plants deliver high purity, stable supply, and simultaneous production of oxygen and nitrogen — making them the preferred choice for medium-to-large capacities in demanding industries.

How do Sanghi ORG oxygen gas plants achieve strong energy efficiency?

Sanghi ORG oxygen gas plants use a medium-pressure cycle (32–35 kg/cm²) and efficient expansion engine, resulting in low specific power consumption — often around 1.0 kWh per m³ of oxygen for larger models.

Why do many users prefer Sanghi ORG nitrogen gas plants?

Sanghi ORG nitrogen gas plants offer robust construction, reliable long-term performance, efficient dual-gas output, and low operating costs — providing excellent uptime and value.

How long does it take for a Sanghi ORG oxygen gas plant to reach full production after defrost?

After the periodic defrost cycle, the plant typically resumes full production in 8–10 hours, minimizing disruption in continuous operations.

Can Sanghi ORG oxygen nitrogen gas plants produce both gases at high purity simultaneously?

Yes. The double-column design enables efficient co-production of 99.6% oxygen and high-purity nitrogen without major additional cost.

What kind of support is available for Sanghi ORG oxygen gas plants and Sanghi ORG nitrogen gas plants?

We provide full lifecycle support, including original spares and service engineers, even for plants installed 25–30 years ago.

What purity levels do Sanghi ORG oxygen nitrogen gas plants typically achieve?

Sanghi ORG oxygen nitrogen gas plants deliver 99.6%+ oxygen as standard, with nitrogen up to 99.9999% (1 PPM impurities possible in specialized configurations) — suitable for industrial, medical, and high-spec applications.

What is the typical power consumption for a Sanghi ORG oxygen gas plant?

Power consumption is among the lowest in the class, often around 1.0 kWh per m³ of oxygen for capacities of 250 m³/hr and above, due to optimized medium-pressure design and efficient refrigeration.

What is the expected lifespan and maintenance for Sanghi ORG oxygen gas plants?

With proper maintenance, Sanghi ORG oxygen gas plants operate reliably for 20–30+ years. Defrost cycles occur every 8–12 months, with routine inspections of compressors, sieves, and the cold box keeping downtime low.

Are Sanghi Overseas and Sanghi Organization the same as Sanghi Oxygen?

No. Sanghi Overseas and Sanghi Organization are a completely independent company and manufacturer from Sanghi Oxygen. We are separate entities and direct competitors — please verify the company name when comparing options.

If you're seeking a dependable, high-performance oxygen nitrogen gas plant from a trusted oxygen plant manufacturer, contact Sanghi Overseas for export projects or the Sanghi Organization for domestic needs in India.

We're here to support your transition to efficient, on-site gas production with proven, lasting results.