PROJECT CASE STUDY

Nantong, Jiangsu — 4,000 Nm³/h high-purity nitrogen plant

A 4,000 Nm³/h cryogenic nitrogen plant producing 99.999% nitrogen with a guaranteed low residual oxygen content. The plant is integrated into the customer’s central control room and was handed over together with operator training — the reference project for customers who need high-flow nitrogen purity at the 5N level.

4,000 Nm³/h

Nitrogen capacity (GAN series)

99.999% (5N)

Nitrogen purity

Low residual O₂

Guaranteed limit

Central control room

Integrated with customer DCS

PROJECT DATA

Project data

Project name

4,000 Nm³/h high-purity nitrogen plant, Nantong

Location

Nantong, Jiangsu, China

Plant type

Cryogenic nitrogen generation unit (GAN series)

Capacity

4,000 Nm³/h nitrogen

Purity

99.999% (5N) with guaranteed low residual oxygen content

Control

Integrated into the customer's central control room, with on-line purity analysis

Scope of supply

Process design, engineering, manufacture, factory testing, shipment, erection supervision, cold commissioning, performance test, operator training

Handover

Operator training and documentation package delivered at handover

The residual oxygen guarantee, discharge pressure and specific power figures are contract specific, confirmed in the performance test record and available to qualified customers on request.

ENGINEERING

What made this project demanding

High flow combined with high purity

4,000 Nm³/h at 99.999% cannot be produced by a PSA unit at reasonable cost. The nitrogen column has to be designed for the additional purification stage, and the feed air quality becomes a design driver.

Guaranteed residual oxygen

The residual oxygen limit is guaranteed, which drives analyser selection, on-line measurement and the control strategy rather than being checked after start-up.

Integration into the customer's control room

The plant operates from the customer's central control room, so signals, alarms and operating philosophy had to match their existing DCS and shift practice.

DELIVERY

How we delivered it

Process design for 5N purity

Column configuration and the additional purification stage were designed for 99.999% at 4,000 Nm³/h with a guaranteed residual oxygen content.

Workshop manufacture and factory testing

Cold box and purifier were assembled and function-tested in our workshop, with inspection records included in the documentation package.

Central control room integration

Control, alarm and purity analysis were integrated with the customer's DCS so the plant runs from their existing control room.

Commissioning and purity verification

Cool-down, start-up and performance testing were carried out on site, with purity and residual oxygen verified against the guarantee.

Operator training and handover

Operators were trained on the real plant, and operating and maintenance manuals, as-built drawings and records were handed over.

YOUR PROJECT

Talk to us about a plant like this.

Flow, purity, pressure and site conditions are enough for a preliminary configuration and budgetary figure.