Confirm whether the hydrogen is gaseous or liquid and how it is produced, stored, and used, then trace storage, piping, vent stacks, detection, ventilation, and separation through every discipline. AI can flag conflicts; the engineer of record and the authority having jurisdiction decide compliance.
What does NFPA 2 cover?
NFPA 2 is the Hydrogen Technologies Code. NFPA describes it as providing fundamental safeguards for the generation, installation, storage, piping, use, and handling of hydrogen in compressed gas (GH2) or cryogenic liquid (LH2) form.
NFPA’s official NFPA 2 page identifies the 2026 edition as current when checked on October 4, 2026. Confirm the edition, local amendments, and project scope that actually govern the work. The publisher’s newest edition does not establish local adoption.
Other compressed gases and cryogenic fluids on the same project follow the NFPA 55 guide. Vehicle fueling sites may also involve the NFPA 30A guide, and stationary fuel cell or energy storage installations may sit next to systems in the NFPA 855 guide. Record which document the authority applies to each part.
Start from where the hydrogen is and how it moves
Bring the site plan with storage and dispensing locations, the hydrogen piping drawings and isometrics, the vendor data for storage, compression, dispensers, electrolyzers, or fuel cells, the vent stack details, the gas detection and shutdown drawings, the electrical area classification plans, the mechanical ventilation drawings for indoor equipment, and the specifications.
Note whether the hydrogen is delivered, produced on site, or both, and whether any equipment is indoors. Those facts decide which sheets carry the answer.
Follow the hydrogen from source to use
| Review question | Sources to compare | Decision to record |
|---|---|---|
| Form and source | Project narrative, vendor data, code summary | Confirm the hydrogen form and supply method are stated the same way in every document. |
| Storage location | Site plan, civil plans, vendor layout | Match storage and compression locations and their surroundings across sheets. |
| Piping | Piping drawings, isometrics, specifications | Trace each line from source to use and confirm materials agree with the specification. |
| Vent stacks | Vent details, roof or site plan, vendor data | Check that each relief or vent discharge is drawn and compare its location with openings and intakes. |
| Detection and shutdown | Detection drawings, sequences, electrical plans | Identify detectors, shutoffs, or responses in the sequence that are not drawn. |
| Indoor equipment | Mechanical ventilation drawings, architectural plans, classification plans | Confirm rooms with hydrogen equipment show the same ventilation and classification on each sheet. |
Carry classified areas into the NFPA 70 electrical guide, explosion protection into the NFPA 69 guide, and site layout into the civil and site drawing checklist.
Example: a vent stack beside a building intake
Hypothetical example. The vendor layout places the hydrogen storage vent stack at the end of the storage pad. The architectural elevation of the adjacent building shows a new outdoor air louver at the same end, and the site plan does not show the stack at all.
The vendor layout shows a hydrogen vent stack near the adjacent building’s outdoor air louver, and the site plan omits the stack. Please confirm the stack location and show it on the site plan.
The engineer of record coordinates the stack location with the vendor and the architect. Whether the arrangement meets the adopted code is the engineer’s and authority’s decision.
Review hydrogen system documents with Groundbook
Upload the current project PDFs and relevant specifications to Groundbook. Identify the governing issues and add the applicable NFPA 2 reference from a copy you are licensed to use, where the license permits uploading it. State the edition, amendments, review area, and known exclusions in your instructions.
Compare the site plan, hydrogen piping drawings, vendor data, vent stack details, detection and shutdown drawings, electrical classification plans, ventilation drawings, and specifications. Flag form, storage, piping, vent, detection, and indoor equipment information that differ between sources. Use the supplied NFPA 2 edition where applicable and cite both sources.
Groundbook links each potential finding to the sheets behind it. Keep missing vendor information separate from documents that disagree with each other.
Document review does not determine separation distances, classify hazardous areas, size vents or ventilation, or approve the installation. Those decisions remain with the engineer of record and the authority having jurisdiction.