26 April 2024

WHA Launches O2 Equipment Supplier Certification Program

Ignition and combustion hazards are present in all oxygen and oxygen-enriched systems, and catastrophic fires have occurred in nearly every industry that uses oxygen.
United States Accounting and Audit
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  • Oxygen safety relies heavily on oxygen equipment suppliers (OES) to deliver products with oxygen-compatible materials and a verified level of cleanliness.
  • Oxygen equipment suppliers face an increasingly complex landscape of safety requirements.
  • WHA's new Oxygen Equipment Supplier Certification Program helps both suppliers and their customers grow safely and confidently.

Ignition and combustion hazards are present in all oxygen and oxygen-enriched systems, and catastrophic fires have occurred in nearly every industry that uses oxygen. Oxygen fire risk mitigation relies heavily on oxygen equipment suppliers (OES) to consistently deliver products with traceable oxygen-compatible materials and a verified level of cleanliness.

Today, oxygen equipment suppliers face an increasingly complex landscape of safety requirements. They must often demonstrate compliance with multiple international standards from different industries as well as from a diverse global customer base with differing requirements.

In response, WHA has created a new Oxygen Equipment Supplier Certification Program, ensuring that suppliers' equipment production processes comply with industry best practices for oxygen service and fire risk mitigation.

This new offering stands to help both suppliers and their customers grow safely and confidently in the oxygen industry.


An industrial oxygen part being lowered into a cleaning bath.

Oxygen Equipment Suppliers Face Increased Scrutiny

In recent years, several publications from the Compressed Gas Association (CGA) and the European Industrial Gases Association (EIGA) have been revised and harmonized, adding quality requirements for oxygen equipment suppliers, including valve manufacturers.

These documents include:

The scrutiny doesn't stop there; however, as many experienced oxygen users and suppliers, including the major industrial gas companies, have their own set of requirements. They also want to audit their suppliers to ensure their equipment is properly specified, verified, cleaned, and packaged as required for use with oxygen.

"Oxygen equipment suppliers have to consider many design factors to accommodate different customer applications," explains WHA CEO Gwenael Chiffoleau, Ph.D. "However, most have very similar requirements for oxygen: suppliers need to demonstrate that they can produce functional, clean and compatible valves and equipment. The CGA and EIGA harmonized publications provide an opportunity to target minimum requirements for suppliers that are accepted by most customers of oxygen equipment."


A basic white light inspection reveals finger prints and debris within this oxygen part.

WHA Steps Up As An International Authority

While standards and guidelines exist, there are currently no official certifying agencies for equipment suppliers. Suppliers and customers must perform their own audits to determine compliance — an expensive and time-consuming process.

"We've been asked to serve in that capacity for many years," says Elliot Forsyth, PE, WHA Chief Strategy Officer. "Now we're stepping up to take a more formal role in offering this service because WHA is a globally recognized expert on the topic and also helped develop the standards."

The program is primarily intended for industrial oxygen valve manufacturers. However, it can also be applied to suppliers of other industrial oxygen pressure equipment, such as pumps and compressors, filters, heat exchangers, piping, instrumentation, pressure vessels, and others. OESs for other oxygen industries, such as medical/healthcare and aerospace, can also benefit from this type of auditing and certification, especially considering the criticality of this equipment for life support or propulsion applications.

Auditing Oxygen Cleaning Processes

The certification program audit focuses on materials traceability/compliance and the processes used by suppliers to receive, clean, inspect, verify, assemble, test and package oxygen equipment. Incompatible materials and contaminants, such as particulate and non-compatible oils and greases, pose a severe first risk, and oxygen cleanliness must be achieved and maintained throughout the process.

Common steps that are audited include:

  • Receiving and tracking third-party clean parts
  • Disassembly and pre-cleaning (if required)
  • Piece part cleaning and drying
  • Inspecting clean parts
  • Assembling clean parts
  • Pressure testing and functional testing clean assemblies
  • Preserving and preparing clean assemblies for shipment

The audit scope can also include addressing customer orders, procuring, receiving, traceability, and control of materials and their associated oxygen compatibility testing/justification.


Specialized packaging is required to preserve oxygen cleanliness before use.

WHA's OES Certification Process

WHA's Oxygen Equipment Supplier Certification Program follows a phased approach. Each phase may require more than one revision in order to achieve compliance:

  1. Audit Scope and Plan: WHA works with the client to identify personnel, locations, and internal documentation needed for the audit, as well as the standards and cleanliness specifications each process must satisfy.
  2. Desktop Audit: WHA reviews the provided documentation and seeks any additional information that is required.
  3. Live Audits: WHA performs onsite and/or virtual inspections of the oxygen equipment supplier facilities, evaluating each phase of the manufacturing process from cleaning through packaging and final shipping.
  4. Oxygen Cleanliness Verification (OCV): Tests at WHA's laboratories quantify the cleanliness of oxygen equipment compared to the required cleanliness specifications.
  5. Audit Reporting and Certification: After the successful completion of phases 1-4, the supplier receives a detailed report and official certification from WHA.

After certification, suppliers will continue to receive periodic maintenance audits and checks to demonstrate that they are continually in compliance.


Black light inspection reveals dangerous contamination that would otherwise be invisible to the naked eye.

Additional Support

Throughout the process, WHA identifies nonconformities and opportunities for improvement. The program is designed to educate and equip oxygen equipment suppliers with everything they need to achieve compliance and demonstrate safe practices.

Optional consulting and support services include:

Industry Benefits

WHA's new certification program is already benefiting equipment suppliers and their customers. When customers accept WHA's audit in lieu of their own, the vendor certification process is dramatically simplified.

"We're offering these services as an independent third party to help our clients achieve their goals and increase oxygen safety on a global scale," says Gwenael. "Maintaining an approved supplier list is a very rigorous process, and responding to multiple audits from various customers is time-consuming. We're cutting down the time and costs required for both suppliers and customers to do so."

By creating a unified process and language around certification, WHA also hopes to benefit the industry as a whole with more consistency between the ways that OESs are being evaluated.


Oxygen cleaning and packaging inside WHA's own clean rooms.

Leverage WHA's Oxygen Equipment Supplier Certification Program

Are you a manufacturer of oxygen equipment needing to demonstrate the safety and compliance of the products you supply?

Are you a customer of oxygen equipment needing to verify the safety and compliance of the products you receive?

The content of this article is intended to provide a general guide to the subject matter. Specialist advice should be sought about your specific circumstances.

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