The HXD-V1 takes wet hydrogen under pressure from HXB-V1 units, removes the water, and heats its adsorber towers with mains power to regenerate them. Pressure, hydrogen, electricity and heat are all present in one rack unit.
This chapter covers the hazards and the immediate safety actions. Read it before you install or operate the unit.
- HazardsHydrogen · pressure · mains power · heat
- When to readAll of it, once, before installing
First timeThere is no section to skip. Read it through once before installing.
Done this beforeRe-read the signal words and the emergency response, and check them against your own site safety rules.
On this pageSignal words
Signal words#
This handbook uses the same signal words as the HXB-V1 handbook. They differ in severity, so read them as such.
| Signal word | Meaning |
|---|---|
| DANGER | A situation that will cause serious injury or death if not avoided |
| WARNING | A situation that could cause serious injury or death if not avoided |
| CAUTION | A situation that may cause minor or moderate injury if not avoided |
| NOTICE | Information that is not about personal injury but prevents equipment damage or loss of performance |
The hazards#
PPE#
- Routine operation and checks
- Safety glasses, closed-toe shoes and suitable work clothing
- Working on fittings and tubing
- Safety glasses and work gloves. Stop the hydrogen supply and confirm the unit is depressurised first
- Handling condensate from DRAIN
- Safety glasses or goggles and alkali-resistant gloves. The condensate may carry alkaline electrolyte
- Opening a cover
- Safety glasses and work gloves. Remove the power cord and let the unit cool for several hours first
Built-in protection#
| Function | What it does |
|---|---|
| Relief valve | Opens if the gas-side pressure rises above its set pressure and discharges to the vents |
| Overheat trip | Thermostats on each tower cut heater power directly if the wall gets too hot, independent of the software |
| Liquid leak sensor | Detects liquid collecting inside the enclosure and triggers an emergency stop |
| Overpressure stop | The software triggers an emergency stop if system pressure exceeds 15 barg |
| Adsorber overtemperature stop | The software triggers an emergency stop if a tower runs 30 °C or more above the regeneration temperature (250 °C at most) |
| Fan monitoring | Warns if any of the three ventilation fans stops |
| Fused power inlet | IEC C14 inlet with 2-pole switch and fuses |
These functions protect the unit. They do not replace the hydrogen detection, ventilation and emergency stop that your site design requires. The leak sensor detects liquid; it is not a hydrogen detector.
Emergency response#
The Emergency STOP button at the top right of the control app stops the dryer at once. Once the cause is found and fixed, clear it with the Release button in the same place. If the app is not available, or there is smoke or fire, cut the power at ON/OFF or at the supply circuit.
| Situation | What to do |
|---|---|
| Hydrogen smell, hiss or gas alarm | Stop hydrogen production at the HXB-V1 units from a safe distance. Ventilate. Keep ignition sources away. Do not re-pressurise until the leak is found and fixed. |
| Smoke, burning smell, overheating | Switch off the HXD-V1 at ON/OFF or at the supply circuit. Stop the HXB-V1 units. Do not open the unit while hot. |
| Liquid on or under the unit | Stop the system, switch off, and treat the liquid as alkaline. Check the DRAIN line and the separator before restarting. |
| Fire | Isolate power and the hydrogen supply if this can be done safely. Let a hydrogen fire burn out once the supply is stopped. Follow the site fire plan. |
What this chapter is based on
- HXD-V1 datasheetPDF · 3.2 MB
- HXD-V1 outline drawingPDF · 368 KB
- First start checklistPDF · 61 KB
- Routine check sheetPDF · 66 KB
- Maintenance logPDF · 49 KB
- HXD-V1 user manualPDF · 2.7 MB
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