Elegant and straightforward, Steer Energy’s purge wHystle is an economical, non-electrical device that indicates the start, transition and end of a purge by sound.
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Challenge
When a new gas installation is connected to the main, the air filling the pipes has to be replaced with fuel gas. This process is called purging.
During the purge, some of the fuel gas mixes with the air in the pipes, creating a potentially explosive mixture in the system. Current legislation on purging mitigates the hazard of this flammable mixture resulting in a safe process. The volume of gas used in the purge is compared to the calculated volume of the system and the purge is confirmed by lighting the appliance at the end of the line. These standards have been designed and written for Natural Gas, but hydrogen is more flammable, and therefore the current procedures may not be suited to hydrogen.
Reaction
Purges can be measured using gas detectors which are generally expensive electronic devices which need regular calibration and batteries changing. Testing for purge completion by attempting to ignite the gas may result in damage to the system if the purge is not complete. A cheap non-electric method of measuring the purge is an attractive option to make purging simpler and safer.
Solution
Elegant and straightforward, Steer Energy’s purge wHystle is an economical, non-electrical device that indicates the start, transition and end of a purge by sound.
The wHystle note changes in response to the gas flowing through the system, thereby providing a real-time indication of the purge progress. Since it works by sound, the engineer does not have to constantly look at a readout but can control the purge or monitoring the gas flow.
The wHystle provides direct feedback on the purge progress so the operation can be proactively measured without relying on estimated values. The wHystle indicates when pure hydrogen (or other fuel gas) is flowing, so it reduces the risk of attempting to light an incomplete purge. It can be used on purge points, purge stacks, directly on appliances, or built into fittings. It will detect and differentiate between air, Natural Gas and hydrogen.
Value
We believe wHystle will make the work of gas engineers and installers safer and easier. It directly indicates the purge progress without needing to be constantly visually monitored. Previously, calculating purge volumes resulted in estimating the amount of gas to use; directly measuring the purge with a wHystle optimises the volume of gas used to achieve the purge. For network pipes and services, the wHystle can prevent the release of large gas volumes while an electronic gas detector takes the required two separate gas readings.
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