Hydrogen drainage measures
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I would like to ask how companies currently handle the drainage of hydrogen pipelines or containers – is it done through regular manual drainage or automatic water removal? Is there any method of drainage that does not allow hydrogen to escape? Thank you!
Thermostatic valves are not considered unless they are of sufficient quality. The low-pressure hydrogen electrolyzed to the inlet of the hydrogen compressor is automatically discharged via a water seal overflow. It’s simpler to use manual operation after the hydrogen compressor; there are two valves, one that remains open and one used for draining water, to prevent valve failures ； Ideally, it would be a collection tank + level gauge + control valve (or on/off valve); this prevents the release of hydrogen gas, but it takes up space and is costly.
It mainly depends on the hydrogen pressure; if the pressure is low, less than 10 KPa, a water seal can be used, while manual water feeding is employed if the pressure is high. Thermostatic valves are not often used in hydrogen pipelines, as they will release some hydrogen, posing a certain safety risk to the surrounding area.