Nitrogen (Oxygen Free)

A three-page COSHH Assessment Form, with some example text reading:

Health risks: Inhalation

Skin contact: Adverse effects are not expected from this product.

Eye contact: Adverse effects are not expected from this product.

Ingestion: Ingestion is not considered a potential route of exposure.

Inhalation: In high concentrations, it may cause asphyxiation. Symptoms may include Cardiac sensitisation, anaesthetic effects, light-headedness, dizziness, confusion, lack of coordination, drowsiness, and unconsciousness.

Oxygen-Free Nitrogen (OFN) is a high-purity, inert gas that plays a crucial role in various industrial applications, particularly in HVAC, refrigeration, and manufacturing. Its primary functions include purging, blanketing, and pressure testing systems, all of which help prevent oxidation and enhance safety. By effectively displacing potentially hazardous oxygen and moisture in pipelines, OFN not only protects products from degradation but also ensures operational integrity.

Key Uses of Oxygen Free Nitrogen (OFN):

HVAC and Refrigeration: OFN is extensively employed for pressure and leak testing of refrigeration systems, capable of withstanding pressures up to 137 bar. This critical pre-charging step ensures the system's integrity before introducing expensive refrigerants, thereby safeguarding both resources and equipment.

Brazing and Welding: In brazing processes, OFN serves as an essential shielding gas. It effectively prevents internal oxidation (scaling) of copper pipes during heating. Additionally, it finds applications in advanced techniques such as laser and plasma cutting of stainless steel and aluminium, where its inertness is crucial for maintaining the purity of the cutting environment.

Purging and Inerting: The unique properties of OFN allow it to displace oxygen and moisture within pipes, tanks, and vessels, thereby preventing potential combustion or contamination of valuable materials. This purging process is vital across various settings, ensuring hazardous reactions are avoided and product quality is preserved.

Industrial & Manufacturing: Beyond its role in HVAC and refrigeration, OFN is used in numerous industrial applications, including the heat treatment of metals, where controlled atmospheres are essential. It also aids in the transfer of liquid pressure, which is crucial for many manufacturing processes, and is employed in analytical chemistry for various experimental needs.

Specialised Applications: In niche uses, OFN is particularly valuable for inflating racing tyres and shock absorbers. Its inert nature significantly reduces the risk of oxidation-related damage, enhancing the performance and longevity of high-performance vehicles.

This document is:

• Recognised by local authorities
• Recognised by principal contractors
• Suitable for CDM sites
• Approved by H&S managers

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