P&ID extraction for ammonia and e-fuels.
An ammonia plant fed by electrolysis is three plants on one drawing set: the hydrogen and nitrogen supply, the synthesis loop with its compression and refrigeration, and the refrigerated storage and loading terminal. E-methanol plants replace the synthesis loop with CO2 hydrogenation and distillation. Both are drawn at petrochemical density, and the ammonia storage and loading scope carries some of the highest-consequence safety instrumentation in the industry.
What ammonia and e-fuels drawings carry.
- Electrolysis-fed plants add a hydrogen buffer and compression stage between the stacks and the loop, with pressure, purity and flow instrumentation that a reformer-fed plant does not carry
- The synthesis loop is the densest area: syngas compressor stages, converter bed temperatures, waste-heat boiler steam scope, loop purge and the ammonia separator
- Refrigeration for product condensation and storage is a multi-stage ammonia refrigeration system with its own compressor, condenser and flash-drum instrumentation
- Atmospheric refrigerated storage carries the highest-SIL services on the site: independent high-level trips, tank pressure and vacuum protection, and boil-off gas handling
- Loading to trucks, rail or ships adds emergency shutdown, ammonia detection around the loading bay and custody metering
- Intermittent renewable power forces load-following operation; the modifications for turndown, hydrogen buffering and hot standby arrive as revisions to the loop drawings
- E-methanol plants carry CO2 conditioning and compression, a hydrogenation reactor loop and a distillation train, with methanol storage and loading at conventional temperature
- Ammonia as a marine fuel adds bunkering instrumentation and gas detection that follows the classification society's rules rather than onshore process standards
What the extraction delivers.
- I/O list per area: electrolysis and hydrogen conditioning, air separation or nitrogen supply, synthesis loop, refrigeration, storage and loading
- Instrument index reconciled to the IFC set across the supply, synthesis and terminal drawing packages
- Equipment list covering electrolyzer balance-of-plant, syngas compressors, converter and waste-heat boiler, refrigeration compressors, atmospheric storage tanks and loading arms
- Line list with hydrogen, ammonia and refrigerant service and the low-temperature material spec on storage and loading
- Valve list with fail position on loop isolation, storage tank inlet and loading emergency shutdown
- SIS subset for ammonia and hydrogen detection, loop overpressure, tank overfill and loading shutdown
- Revision comparison across the intermittent-operation modifications that renewable power supply forces on the synthesis loop
Instrument tags on a ammonia and e-fuels drawing.
- AT-H2-0210Hydrogen purity analyzer downstream of the electrolyzer buffer
- PT-SGC-1105-2oo3Syngas compressor discharge pressure, voted 2oo3
- TT-CNV-1302-B2Converter bed 2 temperature
- LSHH-TK-2101Independent high-high level trip on refrigerated ammonia tank 1
- AT-NH3-2305Ammonia detector at the loading bay
- ESDV-LD-2402Loading arm emergency shutdown valve
Regulatory context.
- OSHA 29 CFR 1910.111 covers anhydrous ammonia storage and handling; OSHA PSM applies above threshold quantities
- ANSI/CGA G-2.1 sets requirements for anhydrous ammonia storage and handling systems
- API 620 governs the low-pressure refrigerated storage tanks
- IEC 61511 governs the SIS on the synthesis loop, storage and loading
- EU Seveso III and national equivalents apply to ammonia inventories on European sites
- Classification society rules apply to ammonia bunkering and fuel-supply systems on marine projects
Which discipline reads it.
Process EngineersHydrogen buffering, synthesis loop balance, refrigeration and the e-methanol distillation train.Functional Safety EngineersTank overfill, loop overpressure, ammonia and hydrogen detection and loading shutdown.Controls EngineersConverter temperature profile, compressor controls, load-following logic and terminal metering.Piping and Mechanical EngineersLow-temperature storage piping, refrigeration compressors, loading arms and waste-heat boiler scope.
Common questions
Can the electrolysis, synthesis and terminal packages share one register when three EPCs drew them?
Yes. One workspace, segmented by drawing area, with each package's tags read as printed in its own convention. The tie-in sheets that carry two conventions are read as they are.
Where does the storage tank overfill protection land?
In the SIS subset of the instrument index, with the sheet reference. The SIL allocation and proof-test records come from the safety requirements specification, which remains the operator's document.
Do load-following modifications get treated as revisions?
Yes. The baseline loop drawings are compared against the modified set and the change report lists the new buffering, turndown and standby instrumentation on the original sheets.
Is e-methanol handled the same way as ammonia?
The same registers are built from the same document types. The CO2 conditioning, hydrogenation loop and distillation train come into the I/O list and equipment list as their own areas.
Does the line list carry the low-temperature spec on the storage and loading lines?
The line list carries what the sheet prints, including the spec code and design temperature where they appear. The low-temperature service subset filters out on the spec column.
Run it on your ammonia and e-fuels drawings.
Upload a P&ID set and see the instruments, equipment, and lines it reads before committing to a plan.