Electrolyser Stack,
Workforce Stack.
The hydrogen electrolyser-plant regulatory stack — five binding layers
Hydrogen plant construction collapses ATEX (H2 zone), pressure-equipment, and the EIGA hydrogen-installations body of practice into one envelope, with EN 17127 governing refuelling-point interoperability where dispensing is in-scope.
Hydrogen ATEX zone qualification
- ATEX 1999/92/EC + 2014/34/EU
- EN 60079-10-1 (gas zoning, H2 Group IIC)
- EN 60079-20-1 (gas characteristics)
Hydrogen is ATEX Group IIC / Temperature Class T1 — most stringent equipment-protection requirements. Worker authorisation includes IIC-rated PPE and intrinsic-safety competence (FR ISM-ATEX or equivalent).
EIGA hydrogen-installations practice
- EIGA Doc 15/21
- ISO 19880-1:2020 (refuelling stations)
- EN 17127:2024 (outdoor refuelling points)
EIGA Doc 15/21 is the European industry body-of-practice for siting, separation distances, and material compatibility. ISO 19880-1 governs fuelling-station systems; EN 17127:2024 covers outdoor refuelling-point interoperability.
Pressure-equipment for H2 service
- Directive 2014/68/EU (PED)
- EN 13445
- EN 13480
Hydrogen-service pressure equipment requires material qualification for hydrogen embrittlement; PED categories shift due to H2 group classification (Group 1 fluids).
Hydrogen-service welding qualification
- EN ISO 9606-1:2017
- EN ISO 15614-1 (WPQR)
- ASME B31.12 (hydrogen piping)
Welder qualification per EN ISO 9606-1 plus procedure qualification (WPQR) per EN ISO 15614-1 with hydrogen-embrittlement considerations. ASME B31.12 is the US-aligned hydrogen piping code on multinational projects.
EU posted-worker baseline
- Directive 2018/957 + A1 portable document
- National CBA (BG-Bau DE, BTP FR)
- EN 1090-2 EXC2/3
Posted-worker mechanics for cross-border deployment; structural-steel module supports follow EN 1090-2 execution class per consequence assessment.
EU Programme Cohort 2026-2030 — Verified Active
Lhyfe (FR — operating Bouin + Buléon + Bessières, plus pipeline projects); Air Liquide Normand'Hy (FR — Port-Jérôme 200MW PEM electrolyser, construction commenced); Shell Hydrogen 1 (NL — Rotterdam Holland Hydrogen Hub, 200MW PEM, construction); SALCOS phase 1 (DE — Salzgitter Flachstahl steel decarbonisation hydrogen, operating); Genvia (FR — Béziers high-temperature SOEC pilot + commercial scale-up); Uhde Chlorine Engineers / thyssenkrupp nucera (DE — alkaline electrolyser engineering hub, global project pipeline through 2030); Iberdrola Puertollano (ES — 20MW operating + expansion); SardHy (IT — Sardinia 60MW). Funded via IPCEI Hy2Tech / Hy2Use + RHC Hydrogen Bank + NextGenerationEU + national programmes.
Three Electrolyser Technologies — Three Workforce Architectures
PEM (Proton Exchange Membrane — Air Liquide, Shell, Cummins, Plug Power, Siemens Energy Silyzer): platinum-iridium catalyst stack, deionised-water feed, high-pressure H2 output 30-70 bar — workforce stacks PEM-stack-handling competence on H2 baseline. Alkaline (Uhde / thyssenkrupp nucera, John Cockerill, McPhy): KOH electrolyte, lower-pressure H2 output, mature technology — workforce stacks caustic-electrolyte handling. SOEC (Solid-Oxide — Genvia, Topsoe Sunfire, Bloom Electrolyzer): high-temperature 700-900°C operation, ceramic stack, steam feed — workforce stacks high-temperature ceramic handling. Each technology requires different per-OEM commissioning training; cross-technology transfer is not automatic.
Hydrogen Handling — DGUV 113-001 + EIGA IGC 121/04 + ATEX Zone 0/1
DGUV 113-001 (Sicherheit beim Umgang mit Wasserstoff) anchors the German H2-handling regime. EIGA IGC 121/04 (European Industrial Gases Association — Hydrogen Transportation in Containers) anchors the EU-wide H2-handling code. ATEX 1999/92/EC + Directive 2014/34/EU classifies H2 atmospheres at Zone 0 (continuous flammable atmosphere) for stack-internal regions and Zone 1 (occasional flammable atmosphere) for distribution. Workforce competence: per-zone ATEX certification under EN 60079-14 + EN 60079-17 + per-component hot-work permitting. Per-installation, per-zone, per-task — not transferable across technologies.
PED 2014/68/EU Cat. III-IV Stainless Pressure Equipment
H2 distribution piping operates at 30-700 bar depending on storage architecture; the pressure-equipment scope falls under PED 2014/68/EU Cat. III-IV (highest hazard category). Welder qualification: EN ISO 9606-1 with stainless 1.4404 / 1.4571 / Inconel 625 scope; WPQR per-system per-joint; H2-embrittlement-resistant material handling certification. Notified-body inspection (TÜV Süd, DEKRA, Lloyd's Register, Bureau Veritas) governs the WPS approval chain. Workforce pool is small and specialised — primarily DE / NL / IT / Nordic domiciled.
Sectoral Integration — Steel + Refinery + Mobility Customer-Side
Green-hydrogen plants integrate with sectoral off-takers — SALCOS feeds Salzgitter Flachstahl steelmaking, ArcelorMittal Dunkirk DRI (Direct Reduced Iron) for steel-decarbonisation customers; Shell Hydrogen 1 feeds Pernis refinery; Lhyfe feeds mobility (hydrogen-train, hydrogen-bus). Each off-take draws different integration-side competence: steel-side workforce stacks DRI-side high-temperature handling; refinery-side stacks Seveso III + ATEX overlay; mobility-side stacks dispenser-station handling. The plant-side build-out is the workforce focus; the off-take integration depends on customer-side architecture.
Green-Hydrogen Plant vs Biomass-Erection Workforce Regime
Both are EPC erection scopes with combustion-adjacent risk, but green-hydrogen layers DGUV 113-001 + ATEX Zone 0/1 + PED Cat. III-IV + electrolyser-technology-specific commissioning — a distinct cert and pool architecture.
| Conventional Agency | Bayswater | |
|---|---|---|
| Primary hazard regime | Biomass combustion + ash handling (DGUV 113 series, combustion safety) | H2 flammability + embrittlement: DGUV 113-001 + EIGA IGC 121/04 + ATEX Zone 0/1 (continuous + occasional flammable atmosphere) + H2-embrittlement material handling |
| Pressure-equipment scope | PED 2014/68/EU Cat. II-III (boiler, steam circuit) | PED 2014/68/EU Cat. III-IV — H2 distribution 30-700 bar; stainless 1.4404 / 1.4571 / Inconel 625; WPQR per-joint per-system; notified-body inspection chain (TÜV Süd, DEKRA, Lloyd's, BV) |
| Buyer cohort | Biomass / WtE operators + boiler OEMs | Electrolyser OEMs + project developers: Lhyfe, Air Liquide Normand'Hy, Shell Hydrogen 1, SALCOS, Genvia, Uhde / thyssenkrupp nucera, Iberdrola Puertollano, SardHy |
| Technology-specific architecture | CFB / WtE boiler — single-technology workforce | PEM (Air Liquide, Shell, Siemens Energy Silyzer) vs Alkaline (Uhde, John Cockerill, McPhy) vs SOEC (Genvia, Topsoe Sunfire) — three workforce architectures, non-transferable commissioning |
| Funding driver | EU ETS allowance market + national renewable-energy targets | IPCEI Hy2Tech / Hy2Use + RHC Hydrogen Bank + NextGenerationEU + national programmes — multi-year visibility supports long-cycle workforce architecture |
| Off-take integration | District-heat customer or grid-export | Steel-decarbonisation (SALCOS, ArcelorMittal DRI) + refinery (Shell Pernis) + mobility (hydrogen-train, hydrogen-bus dispenser) — off-take-specific integration workforce stacks separately |
| Welder pool | EN ISO 9606-1 carbon steel + low-alloy | EN ISO 9606-1 with stainless 1.4404 / 1.4571 / Inconel 625 + H2-embrittlement-resistant materials; small specialist pool primarily DE / NL / IT / Nordic domiciled |