Step 1 — Pick an equipment tag
8 equipment, 4 templates — drafted from real P&IDs
Every cell on a datasheet is one of four sources: extracted from the drawing (with verbatim quote), inferred from the service, named standard, or honestly TBD. The engineer red-lines, then issues to vendors.
R-201 · drawing DDE-20-01-REACTOR
Ammonia synthesis converter
Template: Vessel · ASME VIII Div 2
- Fields
- 54
- Extracted
- 20
- Inferred
- 10
- Standard
- 15
- TBD
- 9
Caveats from the assistant · 7
Every datasheet ships with the assistant’s own caveats. Read these before red-lining the table — they name the assumptions the engineer must confirm or replace.
- Geometry (ID, T-T, shell/head thickness) is not on the P&ID — process and mechanical engineers must populate from catalyst volume / GHSV sizing and ASME VIII Div 2 §4 thickness calculations before issuing RFQ.
- Design pressure / MAWP (165 barg) taken from PSV-2035 set point per ASME VIII §UG-21; confirm against process flexibility and recycle-compressor settle-out pressure.
- Design temperature (470°C) is an inferred 40°C margin over peak operating 430°C; must be confirmed against runaway / loss-of-quench upset analysis before HTHA Nelson-curve check.
- Shell metallurgy proposed as 2.25Cr-1Mo-V (SA-336 F22V) with internal stainless overlay — connected line spec is 1.25Cr-0.5Mo (P11), which is at/below the API RP 941 Nelson-curve limit at 165 barg H2 partial pressure for 470°C. Material selection MUST be re-confirmed by metallurgy with actual H2 partial pressure and time-at-temperature.
- Sour service (NACE MR0175) inferred from line spec callout; PWHT and 22 HRC hardness control mandatory.
- Nozzle schedule lists only nozzles visible on this P&ID page plus standard mechanical features (catalyst loading/unloading manways) — full schedule (drains, vents, additional instrument nozzles, lifting lugs, support skirt vents) requires a separate vessel sketch / general arrangement from mechanical.
- Flange ratings set to Class 1500 RTJ per ASME B16.5 P-T tables at 165 barg / 470°C in Group 1.10 (Cr-Mo) materials; vendor to confirm and consider Class 2500 if final design temperature increases.
How to read the table
- Extractedvalues were read directly from the P&ID, with a verbatim quote on hover. The drawing actually says it.
- Inferredvalues were reasoned from service or duty (e.g., PSV set point fixes MAWP). The rationale names the specific reason.
- Standardvalues come from a named code (API 660, ASME VIII, API RP 941, TEMA). The reviewer can accept, replace, or argue with a named source.
- TBDcells have no defensible answer. The rationale reads exactly “no information available” — the engineer fills the gap, the tool does not invent it.
Step 2 — Inspect the datasheet
Datasheet · R-201
| Section | Field | Value | Source | Conf. | Rationale / evidence |
|---|---|---|---|---|---|
| Header | Project | Reactor & Product Separation (DDE-20-01) | Extracted | HIGH | Drawing title and number from page_meta. “Reactor & Product Separation” |
| Header | Tag | R-201 | Extracted | HIGH | Equipment tag from equipment block. “R-201” |
| Header | Service | Catalytic ammonia synthesis (3 H2 + N2 → 2 NH3), promoted-iron catalyst, high-pressure / high-temperature hydrogen service | Extracted | HIGH | Service from equipment.service. “Catalytic ammonia synthesis (3 H2 + N2 → 2 NH3), promoted-iron catalyst, high-pressure / high-temperature hydrogen service” |
| Header | Quantity | 1 ea | Inferred | HIGH | Single tag R-201 shown on the P&ID; default one converter per train. |
| Header | Location | — | TBD | LOW | no information available |
| Type & arrangement | Vessel type | Fixed-bed catalytic reactor — multi-bed ammonia synthesis converter (cold-shell, axial-radial flow with inter-bed quench and internal feed/effluent exchanger) | Extracted | HIGH | Type and arrangement explicit in equipment.type and equipment.notes. “Vertical multi-bed catalytic converter, 2:1 elliptical heads. Three axial-radial flow catalyst beds with inter-bed quench gas injection for thermal control.” |
| Type & arrangement | Orientation | Vertical | Extracted | HIGH | Orientation explicitly noted in equipment.notes. “Vertical multi-bed catalytic converter” |
| Type & arrangement | Head type | 2:1 elliptical (ASME) | Extracted | HIGH | Head type explicitly stated in equipment.notes; consistent with ASME VIII §UG-32 elliptical head geometry. Hemispherical may be reconsidered at MAWP > 150 barg — flag for mechanical review. “2:1 elliptical heads” |
| Process conditions | Fluid | Synthesis gas (H2 + N2 + recycle inerts) reacting to NH3 over promoted-iron catalyst | Extracted | HIGH | Process medium from connected feed line and equipment service. “Preheated synthesis feed (H2 + N2 + recycle inerts)” |
| Process conditions | Operating pressure | ≈ 145–149 barg | Extracted | HIGH | Inlet line note 149 barg; outlet line note 145 barg — bracketed across the converter. “Inlet to top of converter at ~400°C / 149 barg” |
| Process conditions | Operating temperature | ≈ 400 (inlet) / 430 (peak/outlet) °C | Extracted | HIGH | Temperatures from inlet and outlet line notes. “Bottom outlet from converter at ~430°C / 145 barg” |
| Process conditions | Design pressure | 165 barg | Inferred | HIGH | PSV-2035 set at 165 barg defines MAWP; design pressure set equal to PSV set point per ASME VIII §UG-21 (vessel must be capable of withstanding the relief setting). |
| Process conditions | Design temperature | 470 °C | Inferred | MEDIUM | Operating peak ≈ 430°C + ~40°C margin per common practice for high-T hydrogen service; final value to be checked against API RP 941 Nelson curve and process upset / runaway analysis. |
| Process conditions | MAWP | 165 barg | Inferred | HIGH | PSV-2035 set point of 165 barg protects vessel; MAWP set at PSV set point per API 520/521 sizing convention. |
| Process conditions | Specific gravity | — | TBD | LOW | no information available |
| Geometry | Inside diameter | — | TBD | LOW | no information available |
| Geometry | Tan-to-tan length | — | TBD | LOW | no information available |
| Geometry | Shell thickness | — | TBD | LOW | no information available |
| Geometry | Head thickness | — | TBD | LOW | no information available |
| Geometry | Corrosion allowance | 3.0 mm | Standard | MEDIUM | ASME VIII Div 2 / industry practice for high-pressure clean hydrogen service: 3.0 mm CA on pressure shell (low-corrosivity dry syngas; main metallurgy concern is HTHA per API RP 941, not wall thinning). |
| Internals | Internals type | Three axial-radial flow catalyst baskets (promoted-iron NH3 synthesis catalyst), inter-bed quench gas distribution rings, internal feed/effluent heat exchanger between bed-3 outlet and bed-1 inlet, cold-shell internal liner isolating pressure shell from catalyst-bed temperatures | Extracted | HIGH | Internals architecture taken verbatim from equipment.notes. “Three axial-radial flow catalyst beds with inter-bed quench gas injection for thermal control. Internal heat exchanger between bed 3 outlet and bed 1 inlet (autothermal). Outer pressure shell carries pressure; inner basket carries thermal load — cold-shell design isolates pressure-shell from peak catalyst temperature.” |
| Internals | Demister / mesh pad | Not applicable | Inferred | HIGH | Catalytic converter service — no liquid disengagement duty; effluent is single-phase hot gas to E-201. |
| Internals | Instrument bridle | Not required — temperatures monitored by multi-point thermowells (TT-2032 in bed 1, TT-2033 across beds 2 and 3); pressure by top-nozzle PT-2031. No level service. | Extracted | HIGH | Instrumentation list shows only P / T / F devices, no level instruments. “Multi-point thermowell symbol 'TT-2033 (6-pt)' covering beds 2 and 3 hotspot monitoring.” |
| Materials | Shell material | SA-336 F22V (2.25Cr-1Mo-0.25V) forged shell course, vacuum-degassed, weld-overlayed internally with austenitic stainless (typ. 309L+347) | Inferred | MEDIUM | High-T (≈430°C) hydrogen partial-pressure service — base CS / 1.25Cr-0.5Mo (line spec P11) is below Nelson curve safe limit at 165 barg H2 partial pressure. Modern NH3 converters use 2.25Cr-1Mo-V (SA-336 F22V or SA-832 22V) per API RP 941 with internal stainless overlay to suppress nitriding from product NH3. Final selection requires HTHA assessment. |
| Materials | Head material | SA-336 F22V (matching shell), with internal stainless weld overlay | Inferred | MEDIUM | Heads matched to shell material for HTHA-resistant high-pressure / high-T H2 service per API RP 941. |
| Materials | Internals material | Catalyst basket / inter-bed exchanger tubes: SS 321H or Alloy 800H (high-T creep + nitriding resistance); distributor / quench rings: SS 321H | Inferred | MEDIUM | Internal basket sees full bed temperature (~500°C peak) but no pressure differential — austenitic stainless / Incoloy 800H standard for ammonia converter baskets to resist nitriding and creep. |
| Nozzles | Inlet nozzle | 10 inch, top dome — preheated synthesis feed from E-201 | Extracted | HIGH | Inlet line 10"-SF-2014-A2C from E-201 to R-201 top. “Line tag '10"-SF-2014-A2C' from E-201 channel outlet into R-201 top inlet nozzle.” |
| Nozzles | Outlet nozzle | 12 inch, bottom — hot effluent to E-201 shell | Extracted | HIGH | Outlet line 12"-SE-2011-A2C from R-201 bottom to E-201. “Line tag '12"-SE-2011-A2C' from R-201 bottom outlet to E-201 shell inlet.” |
| Nozzles | Relief / vent nozzle | PSV-2035 nozzle on top dome, discharging via 3"-FL-2035-A1B to HP flare header FH-001 (PSV set 165 barg) | Extracted | HIGH | PSV tag and outlet line both visible. “Spring-loaded relief symbol on top dome; tag 'PSV-2035 — Set 165 barg' routed to HP flare header FH-001.” |
| Nozzles | ↳ Feed inlet (N1) · Service | Preheated synthesis feed in (top) | Extracted | HIGH | From line 10"-SF-2014-A2C. “Preheated synthesis feed (H2 + N2 + recycle inerts)” |
| Nozzles | ↳ Feed inlet (N1) · Size · rating | 10 inch · ASME B16.5 Class 1500 RTJ | Standard | HIGH | Size from line 10"-SF-2014-A2C; flange rating Class 1500 RTJ per ASME B16.5 pressure-temperature rating tables for 165 barg / 470°C in low-Cr-Mo material (API RP 941 service typically ring-joint). “10"-SF-2014-A2C” |
| Nozzles | ↳ Effluent outlet (N2) · Service | Hot reactor effluent out (bottom) | Extracted | HIGH | From line 12"-SE-2011-A2C. “Hot reactor effluent (NH3-rich + unreacted)” |
| Nozzles | ↳ Effluent outlet (N2) · Size · rating | 12 inch · ASME B16.5 Class 1500 RTJ | Standard | HIGH | Size from line 12"-SE-2011-A2C; Class 1500 RTJ per ASME B16.5 P-T tables at 165 barg / 470°C. “12"-SE-2011-A2C” |
| Nozzles | ↳ Quench gas inlet (N3 — manifolded to inter-bed rings) · Service | Cold quench gas to inter-bed distribution rings (between beds 1–2 and 2–3) under FCV-2034 | Extracted | HIGH | From line 4"-SQ-2034-A2C. “Quench gas tap from C-105 final discharge, routed to inter-bed injection rings under FCV-2034 control.” |
| Nozzles | ↳ Quench gas inlet (N3 — manifolded to inter-bed rings) · Size · rating | 4 inch · ASME B16.5 Class 1500 RTJ | Standard | HIGH | Size from line 4"-SQ-2034-A2C; Class 1500 RTJ per ASME B16.5 for 165 barg syngas. “4"-SQ-2034-A2C” |
| Nozzles | ↳ Relief nozzle (N4 — PSV-2035) · Service | PSV-2035 inlet on top dome to HP flare | Extracted | HIGH | Relief location and routing. “tag 'PSV-2035 — Set 165 barg' routed to HP flare header FH-001” |
| Nozzles | ↳ Relief nozzle (N4 — PSV-2035) · Size · rating | Inlet ≥3 inch · ASME B16.5 Class 1500 RTJ (sized per API 520 — final by relief calc) | Standard | MEDIUM | Outlet line 3"-FL-2035-A1B fixes 3 inch minimum; PSV inlet flange rating Class 1500 RTJ per ASME B16.5 at 165 barg MAWP. Final inlet/outlet sizing per API 520 Part I. “3"-FL-2035-A1B” |
| Nozzles | ↳ Pressure tap (N5 — PT-2031) · Service | Pressure transmitter PT-2031, top inlet (upstream of bed 1) | Extracted | HIGH | Field-mounted PT bubble at top inlet. “Field-mounted bubble 'PT-2031' on top-of-vessel feed inlet” |
| Nozzles | ↳ Pressure tap (N5 — PT-2031) · Size · rating | 1.5 inch · ASME B16.5 Class 1500 RTJ | Standard | MEDIUM | Standard instrument tap size for high-pressure service per ASME B16.5 / typical company instrument-nozzle standard. |
| Nozzles | ↳ Thermowell nozzles (N6 — TT-2032 / TT-2033) · Service | Multi-point thermowells: TT-2032 (3-pt across bed 1) and TT-2033 (6-pt across beds 2 and 3) for catalyst hotspot monitoring | Extracted | HIGH | Two multi-point TWs explicitly tagged on side wall. “Multi-point thermowell symbol 'TT-2032 (3-pt)' through the side wall into bed 1 catalyst basket.” |
| Nozzles | ↳ Thermowell nozzles (N6 — TT-2032 / TT-2033) · Size · rating | 2 inch · ASME B16.5 Class 1500 RTJ (one nozzle per multi-point well) | Standard | MEDIUM | Multi-point thermowell nozzles typ. 2-inch with Class 1500 RTJ flange per ASME B16.5 at 165 barg / 470°C. |
| Nozzles | ↳ Catalyst loading manway (N7) · Service | Top catalyst loading manway / handhole | Inferred | MEDIUM | Multi-bed ammonia converter requires top loading access for promoted-iron catalyst charging; standard mechanical feature even when not shown on P&ID. |
| Nozzles | ↳ Catalyst loading manway (N7) · Size · rating | ≥18 inch blind · ASME B16.5 Class 1500 RTJ (final by vendor) | Standard | LOW | Size per API SPEC 12J / vendor practice for catalyst-charging access; flange rating Class 1500 RTJ per ASME B16.5 for 165 barg. |
| Nozzles | ↳ Catalyst unloading nozzle (N8) · Service | Bottom catalyst unloading / drain | Inferred | MEDIUM | Required mechanical feature for catalyst removal at end of run; not shown on P&ID but standard on multi-bed converters. |
| Nozzles | ↳ Catalyst unloading nozzle (N8) · Size · rating | ≥6 inch blind · ASME B16.5 Class 1500 RTJ (final by vendor) | Standard | LOW | Standard catalyst-drain sizing; Class 1500 RTJ per ASME B16.5 at vessel MAWP. |
| Codes & standards | Design code | ASME VIII Div 2 Class 2 (latest edition), with HTHA assessment per API RP 941 Nelson curves | Standard | HIGH | ASME VIII Div 2 selected because MAWP 165 barg + cyclic high-T H2 service exceeds the practical / economic limits of Div 1; API RP 941 named explicitly for hydrogen attack avoidance per the connected line spec. |
| Codes & standards | NACE compliance | NACE MR0175 / ISO 15156 compliant for any portion that may see wet H2S during start-up, shutdown, or upset (recycle gas may carry traces) | Standard | HIGH | Connected line spec calls out NACE MR0175 explicitly; required despite primary duty being dry syngas. |
| Codes & standards | PWHT requirement | Mandatory — full PWHT per ASME VIII Div 2 §6.4.2 / ASME VIII §UCS-56 for 2.25Cr-1Mo-V (P-No 5A); also required by NACE MR0175 §7.2.1.2 for hardness control | Standard | HIGH | Cr-Mo materials in P-No 5A require mandatory PWHT regardless of thickness per ASME VIII §UCS-56; NACE MR0175 §7.2.1.2 confirms. |
| Testing | Hydrostatic test | Shop hydrotest at 1.43 × MAWP corrected for temperature per ASME VIII Div 2 §8.2 (≈ 236 barg at ambient — final by vendor stress check) | Standard | HIGH | ASME VIII Div 2 §8.2.1 hydrotest factor 1.43 × MAWP at ambient. |
| Testing | RT / UT | 100% volumetric examination of all pressure-retaining welds (RT or UT) per ASME VIII Div 2 §7.4 (Examination Group 1 / Joint Efficiency 1.0); plus 100% PT/MT of all weld-overlay surfaces | Standard | HIGH | Div 2 Class 2 + lethal/HTHA-prone H2 service mandates full NDE per ASME VIII Div 2 §7.4. |
| Testing | PMI / hardness | 100% PMI on all alloy components and weld overlays; weld and HAZ hardness ≤ 22 HRC (235 HV) per NACE MR0175 §7.2.1; production test coupons per ASME VIII Div 2 §3.11 for Cr-Mo-V toughness/creep verification | Standard | HIGH | NACE MR0175 §7.2.1 hardness limit for Cr-Mo SSC resistance; ASME VIII Div 2 §3.11 production-test-coupon requirement for vanadium-modified Cr-Mo. |
| Commercial | Delivery | — | TBD | LOW | no information available |
| Commercial | Warranty | — | TBD | LOW | no information available |
| Commercial | Scope of supply | — | TBD | LOW | no information available |