Choosing an oxygen flow meter can be tricky, especially since oxygen can corrode otherwise durable metals or ignite in high temperatures and cause accidents. Therefore, we should be especially mindful of the following aspects of the device:
- Maximum Velocity
- Equipment Cleaning
Maximum velocity for a stainless steel flowmeter is defined by the “impingement velocity curve” in the internationally harmonized IGC Doc 13/12/E. This is because it limits kinetic energy. Recently, more and more SIL loops are part of oxygen applications as well.
Higher velocities per “non-impingement velocity curve” may be acceptable as long as particles (150 microns and smaller) are filtered out. They are also acceptable for Alloy C22 flowmeters. This is because it has a lower burn rate in oxygen than steel.
Velocity limitations per “impingement curve” for stainless steel are also available in the Endress+Hauser´s sizing applicator when choosing a flow meter and oxygen as the fluid.
Cleaning an oxygen flow meter
An oxygen flow meter must be kept free of contaminants that might ignite or cause ignition. The Endress+Hauser Group offers a broad range of flow meters cleaned according to IEC TR 60877:1999 and BOC Specification 50000810-4. Further, these meters are individually packed into evacuated PE foil with Silicagel bags, which makes them ideal to measure oxygen flow.
These oxygen flow meters also comes with a test report that includes:
- Cleaning method
- Result of visual inspection
- Result of spectrometer measurements