Advanced Photon Source

An Office of Science National User Facility

Experiment Hazard Class 5.4 – Compressed Gas Cylinders


This hazard classification applies to all experiments involving the use of compressed gas cylinders. Other hazard classifications and associated controls may apply to experiments in this hazard class.

Experiment Category

Experiments involving previously reviewed hazard controls are categorized as medium risk experiments.

Experiments involving new equipment, processes or materials, or modified hazard control schemes are categorized as high risk experiments.

Hazard Control Plan Verification Statements

Engineered Controls – The establishment of applicable controls for the identification, storage, handling, and use of compressed gas cylinders, systems, and associated equipment. Line supervisors must consider obviation of hazards by balancing storage and use of compressed gases with operational functions. Avoid excessive inventories of compressed gases.

Procedural Controls – Compressed gas cylinders are considered to be either in use or in storage. There is no provision for a standby situation. Consultation with FMS-FEC fire protection when planning experiments that involve compressed flammable gas and pyrophoric gases. Consultation with ESQ Industrial Hygiene when planning experiments that involve toxic gas, oxygen deficiency hazards or other nonfire compressed gas hazards. The Pressure Technology and Safety Committee (PTSC), upon request, will assist during the review of experiments or processes that involve compressed gas hazards. Arrangements for consultation may be made by the floor coordinators, the APS User Safety Officer, or the XSD ESH Coordinator.Please see the Compressed Gas Cylinder Storage Guidelines for more information.

Design Reviews and Equipment Inspections – A design review is necessary for compressed gas distribution systems.

Training – Sector specific training.

Signs and Labeling – Cylinders are labeled by the vendor. Must conform to DOT, NFPA, and OSHA hazard communication requirements.

Personal Protective Equipment – Safety glasses and safety shoes when handling cylinders.

Monitoring – Dependent upon type of gas, application and work environment.

Hazard Control Verification

Unless otherwise noted in the approved experiment safety plan, the PSC Deputy Associate Laboratory Director of Operations the authority to authorize an experiment in this hazard class to a member of the APS Experiment Review Board and any of the persons in the beamline personnel that appear in the list of Beamline Manager personnel authorized to approve experiments.

Experiment Authorization

The PSC Deputy Associate Laboratory Director of Operations delegates responsibility for verifying that required controls are in place to personnel delegated the authority to perform this task to the experiment On-site Spokesperson, and Beamline Management personnel having experiment safety responsibilities.


ANL LMS-PROC-313: Pressure System Safety 1/11/2017 (Internal link)

Please contact Bruce Glagola or Nena Moonier if you can not access the internal link

Reviewed: March 15, 2017