Nitrogen Generator For Tank Blanketing

In industrial gas separation, Shenger Gas has always followed one simple rule: build honest equipment and back it with reliable data. Over the past ten-plus years, we have delivered several hundred units of nitrogen generator for tank blanketing to chemical, pharmaceutical, and oil storage facilities. Most of our people are engineers who have spent decades working with workshops, field piping, and valves.

The PSA nitrogen generator shown below is our most mature design for tank safety protection after multiple iterations.

What Is Tank Blanketing? Why a Dedicated Nitrogen Generator?

The vapor space above the liquid inside a storage tank can become a fire or oxidation risk if it contains oxygen and volatile hydrocarbons. A nitrogen generator for tank blanketing continuously injects low‑oxygen nitrogen (typically < 2–3% O₂) into the tank roof space, pushing oxygen out while maintaining a slight positive pressure to prevent moisture or contaminants from being drawn in.

Simply put: nitrogen is the inert guard, and the nitrogen generator is its stable source.

Many plants still rely on liquid nitrogen delivered by trucks. But vaporizing LN₂ is expensive, and the supply chain isn't always reliable. Shenger's on‑site nitrogen generator produces nitrogen as needed - on demand, right when you need it.

Working Principle – Physical Adsorption, No Chemicals

We use PSA (Pressure Swing Adsorption) technology, with Carbon Molecular Sieve (CMS) as the core. Here's how it works:

Purified compressed air enters the adsorption tower filled with CMS.

Smaller molecules like oxygen and water vapor are trapped in the pores. Nitrogen molecules, being slightly larger, pass through into the buffer tank.

Two towers alternately adsorb and regenerate, providing 24/7 continuous nitrogen supply.

Only air and electricity are used - no chemicals, no hazardous waste. This makes the system especially friendly for projects bound for the EU or North America, where environmental compliance is a major plus.

For nitrogen generator for tank blanketing applications, we've specifically adjusted the gas distribution structure and tower height ratio to keep oxygen content fluctuation within ±0.1% - even when inlet air pressure varies.

Technical Specifications & Performance Data 

Below are measured data for our typical model SN-5-99.9-10 (customizable based on tank size):

Why does energy consumption matter?
For a 100 Nm³/h unit running 8,000 hours a year, our equipment saves roughly 16,000 kWh compared to similar units. Long‑term operating costs drop significantly - a real selling point for customers in high‑tariff regions like Europe.

Why Nitrogen Generator Works Best for Tank Blanketing

We've seen projects where the nitrogen generator was oversized but had unstable purity, causing loss of tank pressure control or frequent breather valve cycling. For real‑world nitrogen generator for tank blanketing conditions, we added three exclusive features:

1. Slow‑release pressure control valve train
Nitrogen is not forced into the tank; it's supplied in a near‑laminar flow to avoid pressure surges. This is critical for large floating roof tanks or internal floating roof tanks.

2. Dual‑loop redundant oxygen monitoring
One paramagnetic oxygen sensor (non‑electrochemical, no drift) is installed at the nitrogen outlet, another in the tank roof space - both feeding data to the PLC. If oxygen content exceeds the setpoint, purity is automatically increased and an alarm is triggered. No simple shutdown.

3. Anti‑pulverization structure for CMS
Tank blanketing generators often run at low flow rates for extended periods. Ordinary molecular sieve can pulverize due to uneven airflow. We added multi‑layer gas distributors and flexible buffer layers inside the tower. The measured annual pulverization rate is <0.3%.

Certifications & Standards 

• ISO 9001:2015 – Quality Management System

• ISO 22082 – Performance testing for PSA nitrogen equipment

• ASME – Pressure vessels (optional, standard for US/Canada exports)

• CE / PED – EU Pressure Equipment Directive

• ATEX – Optional explosion‑proof electrical cabinets and valves for tank farm use

• GB/T 36370-2018 – Chinese national standard

Every unit shipped includes a third‑party (SGS/TÜV) spot test report or witnessed site test by a customer‑approved agency.
We do not issue fake certificates - this is something we have always stood by.

Typical Industrial Applications

• Crude & product oil depots – Internal floating roof tank nitrogen sealing + vapor recovery front‑end inerting
• Fine chemical raw material tank farms – Benzene, alcohol, ketone tank roof protection to prevent oligomer formation
• Food‑grade vegetable oil storage – Preventing oil oxidation and rancidity
• Pharmaceutical solvent tank farms – Ethanol, acetone, Class A solvent tank safety retrofits
• LNG/CNG stations – Combined nitrogen purging and instrument air supply

Delivery & Service System 

Lead time:
For standard small to medium nitrogen generators (≤200 Nm³/h): 25–35 calendar days (including factory FAT).

Service process:

1. Customer provides tank farm process sketch and nitrogen blanketing valve setpoints

2. Shenger issues P&ID and sizing data sheet

3. Production after mutual confirmation → remote or on‑site pre‑shipment inspection

4. Installation guidance + commissioning + operator training (available in English/Chinese)

5. 24h response during warranty period. Spare parts: 48h domestic, 72h overseas

We do not promise "lifetime maintenance‑free" - that would defy physics.
We state honestly: CMS lifespan is typically 5–8 years; adsorption tower design life is 15+ years. We remind customers every 2 years to do performance re‑testing and provide a maintenance quote - the customer decides.

We don't think a nitrogen generator should be packaged as "high tech."
It's a straightforward piece of equipment that needs stable air, clean power, and someone to glance at the oxygen meter once in a while.

If you happen to be looking for a nitrogen generator for tank blanketing that truly fits your tank storage conditions - with controllable energy consumption and no hassle for maintenance - then let's have a real conversation. Starting with a simple tank farm layout drawing.

Shenger Gas · Only builds nitrogen generators that work for the long run

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