Oxygen FAQ
Up to date, expert answers to frequently asked questions (FAQ) about oxygen supply systems, respiratory care and pulse oximetry written by OCC & collaborators.
Cylinders
- Without access to an oxygen analyser it can be difficult to determine the gas contents in a cylinder. International standards for color of cylinders are not straightforward.
- Most cylinders are filled using pressure swing adsorption (PSA) oxygen plants and thus have a maximum FiO2 of 95% and often considerably less.
- Older oxygen cylinders may be black with a white top. Outside of these standards many variations also exist. All the cylinders in the images below contained oxygen.
- Oxygen analysers should be used to determine gases before use. Cylinders require routine testing and cleaning by certified technicians. Outlet fittings should be examined for damage or corrosion.
![](https://opencriticalcare.org/wp-content/uploads/2020/07/cylinder-color-coding-d6l3t6.jpg)
![](https://opencriticalcare.org/wp-content/uploads/2020/07/unnamed-1-0yzsox.png)
Most oxygen regulators will have a gauge attached, a full J size oxygen cylinder full will have a weight of 78kg (172lb) the oxygen contained in the cylinder weighs approximately 9kg (20)lb, Therefore gauging the volume of oxygen in a cylinder is difficult.
![](https://opencriticalcare.org/wp-content/uploads/2020/07/Oxygen-Regulator-1kykdi.jpg)