Do you have a track record on fuel-cell and hydrogen process-air duty?
We engineer to this duty rather than claiming a long reference list on it. This is a capability page: the blower is designed to your stack, balance-of-plant and area classification using the same custom-engineering method and the same 200 HP VFD test rig we use across every other application. Send us the duty point, the control band, the cleanliness requirement and the area classification, and we engineer and quote to it. We would rather name that boundary honestly than imply installs we have not done.
How tightly can you hold cathode-air flow as the stack load changes?
We engineer the duty point onto the falling, stable portion of the pressure-flow curve and use a backward-curved or backward-inclined wheel for a steep, predictable line, so flow tracks speed cleanly. With VFD or EC speed control as the default we hold flow to within roughly plus or minus 3 to 5 percent across load transients, and tighter with closed-loop control on the balance-of-plant side. We size onto the stable side deliberately so the cathode is neither starved nor over-fed as the current swings, and we verify the curve on the 200 HP VFD test rig before dispatch.
How do you make the blower hydrogen-safe?
Where hydrogen can be present we build spark-resistant construction to AMCA 99 and self-declare ATEX Zone 2 per 2014/34/EU, Category 3G, matched to the gas group and area classification you declare. The configuration uses a non-sparking impeller, a non-ferrous rub ring, bonded earthing throughout, anti-static coatings and bearing-temperature control. Hydrogen has a wide flammable range (4 to 75 percent by volume in air) and a low ignition energy, so we treat every leak-exposed path as an ignition risk and design it out. Zone 1 (Category 2G) is available on application via a Notified-Body partner.
Why does oil-free, clean process air matter, and how do you guarantee it?
The cathode catalyst is poisoned by oil mist and the membrane is degraded by carried-over particulate, and that damage is irreversible. We build an oil-free flow path with a shaft seal chosen to keep lubricant out of the airstream, a non-shedding internal finish, and stainless or coated wetted surfaces where the process demands it, assembled under a clean regime. The blower moves the air; keeping it clean is a system job, so we also document the inlet-filtration interface so the air reaching the stack is as clean as it left the filter.
How do you size the ventilation fan for a hydrogen enclosure?
We size the air-change rate to dilute a credible hydrogen leak below 25 percent of its lower flammable limit, which for hydrogen is 4 percent by volume in air, using the enclosure volume, the leak case you provide and the actual duct resistance rather than a nominal air-changes-per-hour figure. The fan is a spark-resistant, ATEX Zone 2 self-declared build so it is safe in the space it is protecting. Give us the enclosure geometry, the worst-case leak rate and the classification, and we size the flow and the build to it.
What flow and pressure range do these blowers cover?
Across the standard envelope up to 2,00,000 CMH, 2,000 mmWC and 400 HP, but fuel-cell and hydrogen process-air duty typically sits at modest flow and high static rather than near the flow ceiling. High static at a controlled, modest flow is the usual shape of this duty, so we select a wheel with a steep stable curve for it. Tell us your flow, static and control band and we engineer the selection to sit on the stable side of the curve at your operating point.
Can you meet a sound limit for a plant room or test cell?
Yes. As standard we design to below 85 dB(A) at 1 m; below 80 dB(A) is achievable with inlet and outlet silencers plus an acoustic-treated casing, and below 75 dB(A) with a custom acoustic enclosure. Fuel-cell and electrolyser systems often sit in occupied plant rooms or test cells, so we predict the sound level for the selection and engineer the acoustic scope to your stated limit and the space the blower sits in.
Do you build these to CE and ATEX, and what standards actually apply?
Yes. CE is self-declared per 2006/42/EC and 2014/35/EU, and ATEX Zone 2/22 is self-declared per 2014/34/EU (Category 3) where the area classification calls for it, with Zone 1 available on application via a Notified-Body partner. To be precise: those are self-declarations of conformity, not third-party certifications. Performance is tested in-house to the AMCA 210 / ISO 5801 method on our 200 HP VFD test rig, not AMCA-certified, and we are not an AMCA member. Balance is to ISO 21940 G6.3 as standard, G2.5 or G1.0 on application. Our only third-party certification is ISO 9001:2015.
