P&ID extraction for hydrogen.
Green and blue hydrogen plants arrive as new-build greenfield on tight EPC schedules. Controls scope is dense across electrolyzer stacks, compression, storage, and, for blue carbon capture, with funding mechanisms gating disbursement on commissioning evidence.
- I/O list per process area, electrolysis, compression, storage, CCS where applicable
- Instrument index reconciled to the IFC drawing set
- Line list with metallurgy reflecting hydrogen-embrittlement-resistant materials
- SIS subset for combustion, depressurization, and leak-detection scope
- Electrolyzer stack instrumentation is dense at the cell level. The P&ID simplifies, and per-cell tags live on a stack-detail drawing supplied by the OEM
- Hydrogen leak detection is SIS-classified. HC-prefix gas detector tags filter into the SIS register
- Compression scope, multi-stage reciprocating or centrifugal carries vibration, temperature, and pressure monitoring at every stage
- Blue hydrogen, SMR plus carbon capture carries petrochemical-density SIS scope on top of the H2 process
- Alkaline, AEL, PEM, and solid-oxide, SOEC stacks carry distinct BOP scope but converge on similar plant-level tag conventions
- Hydrogen storage at 200-700 bar drives strict instrument-rating documentation. Equipment list captures it alongside material spec
- Trailer loading, tube-trailer venting, and dispensing instrumentation run as a separate terminal-scope workspace
- Carbon capture scope on blue hydrogen plants follows amine-system patterns from refining and gas treatment
- OSHA PSM applies to flammable hydrogen handling above threshold quantities
- IEC 61511 governs SIS lifecycle as in any process plant
- ASME B31.12 for hydrogen piping
- Local fire and explosion regulations, NFPA 2 in the US drive area-classification metadata on equipment lists
Which discipline reads it.
Process EngineerProcess EngineersSMR or electrolysis material balance. PSA-recovery cycle and recycle-compressor integration.Functional Safety EngineerFunctional Safety EngineersSIS scope on reformer trip and PSA emergency shutdown. LOPA on hydrogen makeup and recycle streams.Controls EngineerControls EngineersReformer, PSA, and methanation instrumentation. Tag census including utility, CT, instrument air, nitrogen scope.Mechanical EngineerMechanical EngineersHigh-temperature reformer tubes, PSA vessels, and centrifugal hydrogen-compressor scope. Metallurgy on furnace coil sections.
AT-EC-201Analyzer transmitter on electrolyzer cell stack outletPT-CP-403-1oo2Compression-stage pressure transmitter, voted 1oo2HC-LD-105Hydrogen leak detector at the compressor enclosureTT-STACK-1502Cell stack outlet temperature on a PEM electrolyzerFT-FW-301Demineralized water feed flow to the stackPT-ST-7305Hydrogen storage vessel pressure on a 350-bar receiverRelated
GlossarySafety Instrumented System, SISGlossaryIEC 61511AudienceFor Controls EngineersAudienceFor Process EngineersAudienceFor Functional Safety EngineersAudienceFor Mechanical EngineersIndustryPetrochemicalsIndustryRefiningIndustryLNGSolutionVerify SIS scope and SIL allocation against P&IDsSolutionProduce as-built handover documentation for plant turnoverConvertP&ID to I/O listConvertP&ID to instrument indexConvertP&ID to line list