neqsim-stid-retriever

name	neqsim-stid-retriever
description	Retrieves engineering documents (compressor curves, mechanical drawings, line lists, P&IDs, data sheets, vendor docs, material certificates, fire/PFP documents, piping specs) from document management systems for use in NeqSim engineering tasks. Supports local directories, manual upload, and pluggable retrieval backends (e.g., stidapi for STID). USE WHEN: a task needs vendor performance data, mechanical drawings, line-list route hydraulics, water-hammer route/event evidence, trapped-liquid fire rupture evidence, or as-built documentation for process equipment.
last_verified	2026-07-04

Document Retrieval Skill for Engineering Tasks

Retrieve engineering documents (compressor curves, mechanical drawings, data sheets, vendor reports) for use in NeqSim task-solving workflows.

For water-hammer/liquid-hammer tasks, retrieve STID/P&ID route drawings, line lists, stress isometrics, piping specifications, valve data sheets with closure time, pump curves or trip logs, design-pressure basis, and relevant tagreader event exports into the task references folder.

⚠️ CRITICAL: All documents go INSIDE the task folder

ALL downloaded documents — STID drawings, PI historian exports, vendor datasheets, P&IDs, literature PDFs — MUST be saved to step1_scope_and_research/references/ within the task folder.

NEVER download or save task-related files to workspace-level directories like output/, figures/, or any path outside task_solve/YYYY-MM-DD_slug/.

# CORRECT — saves inside the task folder:
TASK_DIR = "task_solve/YYYY-MM-DD_slug"
out_dir = os.path.join(TASK_DIR, "step1_scope_and_research", "references")

# WRONG — saves outside the task folder:
out_dir = os.path.join(os.path.dirname(__file__), "..", "figures", "stid_docs")  # NEVER
out_dir = "output/stid_docs"  # NEVER

For PDF-to-PNG conversion: Output to the task's figures/:

python devtools/pdf_to_figures.py task_solve/YYYY-MM-DD_slug/step1_scope_and_research/references/ \
    --outdir task_solve/YYYY-MM-DD_slug/figures/

This rule ensures every task is self-contained and portable.

---

This skill is backend-agnostic — it works with any document source:

• Documents placed manually in the task folder
• A pre-existing local directory of downloaded files
• An auto-retrieval backend (configured separately, not part of the public repo)

Document Sources (Priority Order)

The task solver checks these sources in order:

1. Local directory — user provides a path to pre-downloaded docs
2. Task references folder — docs already in step1_scope_and_research/references/
3. Retrieval backend — auto-fetch from a document management system (if configured in devtools/doc_retrieval_config.yaml — this file is gitignored)

This means the workflow works for everyone:

• Users with a retrieval backend get auto-retrieval
• External users place their own PDFs in references/ and the same pipeline runs

---

Option A: User Provides Documents (Works for Everyone)

Place documents in the task's references folder:

task_solve/YYYY-MM-DD_task_slug/
└── step1_scope_and_research/
    └── references/
        ├── compressor_curves.pdf
        ├── mechanical_drawing.pdf
        └── equipment_datasheet.pdf

Or point to an existing directory when creating the task:

neqsim new-task "compressor analysis" --type B \
    --refs-dir "/path/to/existing/docs"

The task solver will automatically:

1. Detect documents in references/
2. Convert PDFs to PNG images (devtools/pdf_to_figures.py)
3. Classify each document (curves, drawings, datasheets, etc.)
4. Extract relevant data using view_image
5. Filter out irrelevant documents based on task type
6. Feed relevant data into analysis notebooks

Option B: Auto-Retrieval (Requires Backend Config — Not Public)

When a retrieval backend is configured via devtools/doc_retrieval_config.yaml (gitignored — never committed), the task solver can auto-fetch documents by equipment tag. See the config template below for setup instructions.

STID Download Helper (Recommended)

Use devtools/stid_download.py to download STID documents directly into a task folder. This ensures all documents end up in the right place:

# Download documents by tag — saves to task's references/ folder
python devtools/stid_download.py --task-dir task_solve/2026-04-16_my_task \
    --inst MYINST --tags 30PT0001 30PT0002 33AI0001

# Download + convert to PNG for AI analysis
python devtools/stid_download.py --task-dir task_solve/2026-04-16_my_task \
    --inst MYINST --tags 30PT0001 --convert-png

# Download specific document numbers
python devtools/stid_download.py --task-dir task_solve/2026-04-16_my_task \
    --inst MYINST --docs E001-AS-P-XB-00001-01 E001-AS-BI000-DS-00001

The helper:

• Downloads PDFs to step1_scope_and_research/references/ inside the task folder
• Saves a stid_retrieval_manifest.json for traceability
• Optionally converts PDFs to PNGs in the task's figures/ directory
• Skips already-downloaded files

Generic retrieval interface

# Generic retrieval interface used by the task solver:
from devtools.doc_retriever import retrieve_documents

docs = retrieve_documents(
    tags=['35-KA001A'],
    doc_types=['CE', 'AA', 'MD', 'DS'],
    output_dir='step1_scope_and_research/references/'
)
# Returns list of downloaded file paths, or [] if no backend configured

---

Document Classification and Relevance Filtering

Document Type Codes

Code	Type	When Relevant
CE	Performance Curves / Calculations	Compressor, pump, turbine analysis
DS	Data Sheet	Any equipment analysis
AA	General Arrangement Drawing	Physical layout, sizing
MD	Mechanical Drawing	Detailed dimensions, nozzles
RV	Vendor Manual / Report	Operating procedures, maintenance
RE	Report	Background reference
ER	Assembly / Erection Drawing	Installation, coupling details
PL	Parts List	Spare parts, BOM
PI	P&ID	Process topology
PF	PFD	Process flow overview
IN	Instrument Data Sheet	Control system design
SP	Specification	Material/piping requirements
LL	Line list / route table	Piping hydraulic route models with PipingRouteBuilder
MC	Material certificate / material class sheet	Pipe grade, SMYS/SMTS, heat number, toughness, temperature limits
FP	Fireproofing / PFP specification	Required fire endurance, protection type, inspection/condition evidence
FC	Fire or consequence study	Fire zone, heat flux, exposed length/area, escalation and source-term basis

Relevance Scoring

The task solver filters documents by relevance to avoid wasting time on irrelevant content. Only documents above the relevance threshold are extracted and analyzed:

DOC_RELEVANCE = {
    'compressor_analysis': {
        'CE': 1.0,   # Performance curves — essential
        'DS': 0.9,   # Data sheet — essential
        'AA': 0.7,   # General arrangement — useful
        'MD': 0.6,   # Mechanical drawing — useful
        'ER': 0.6,   # Assembly drawing — useful
        'RV': 0.5,   # Vendor manual — background
        'RE': 0.4,   # Report — background
        'PL': 0.2,   # Parts list — skip
        'SP': 0.3,   # Specification — skip
    },
    'heat_exchanger_analysis': {
        'DS': 1.0, 'CE': 0.9, 'AA': 0.7, 'MD': 0.6, 'RV': 0.5,
    },
    'separator_analysis': {
        'DS': 1.0, 'AA': 0.9, 'PI': 0.8, 'MD': 0.6, 'IN': 0.7,
    },
    'pipeline_design': {
        'LL': 1.0, 'DS': 1.0, 'SP': 0.9, 'PI': 0.8, 'CE': 0.7, 'MD': 0.6,
    },
    'trapped_liquid_fire_rupture': {
        'PI': 1.0,   # P&ID / STID isolation boundaries
        'LL': 1.0,   # Line list, ID, wall, design P/T, material class
        'SP': 0.95,  # Piping spec, flange/gasket/bolt/material class
        'MC': 0.95,  # Material certificate or material class sheet
        'FP': 0.90,  # PFP/fireproofing requirement and condition
        'FC': 0.90,  # Fire/consequence study heat flux and exposed area
        'DS': 0.75,  # Equipment/piping datasheets
        'MD': 0.70,  # Mechanical arrangements and dimensions
        'IN': 0.60,  # Instruments, alarms, trips, relief availability
        'RE': 0.55,  # Prior reports or technical notes
    },
    'general': {
        'DS': 1.0, 'CE': 0.9, 'AA': 0.7, 'PI': 0.7, 'MD': 0.6,
        'RV': 0.5, 'RE': 0.4, 'ER': 0.4, 'IN': 0.5, 'SP': 0.4,
        'PL': 0.2, 'PF': 0.6,
    },
}

def filter_relevant_docs(doc_list, task_type, min_relevance=0.5):
    """Filter documents by relevance to the task type.

    Args:
        doc_list: List of dicts with at least 'docType' or 'doc_type' key
        task_type: One of the keys in DOC_RELEVANCE
        min_relevance: Minimum score to keep (default 0.5)

    Returns:
        (relevant, filtered_out) — two lists
    """
    relevance_map = DOC_RELEVANCE.get(task_type, DOC_RELEVANCE['general'])
    relevant, filtered_out = [], []
    for doc in doc_list:
        dtype = doc.get('docType') or doc.get('doc_type', '')
        score = relevance_map.get(dtype, 0.0)
        if score >= min_relevance:
            relevant.append({**doc, '_relevance': score})
        else:
            filtered_out.append({**doc, '_relevance': score,
                                 '_reason': f'Below threshold ({score} < {min_relevance})'})
    return relevant, filtered_out

Trapped-Liquid Fire Rupture Evidence Retrieval

For tasks involving trapped liquid, blocked-in liquid, no pressure relief, fire exposure, PFP demand, pipe rupture, or flange failure, use task type trapped_liquid_fire_rupture and search for this evidence pack:

1. P&ID/STID or isometric showing isolation valves, vents, drains, relief paths, line numbers, and segment boundaries.
2. Line list or route table with NPS/ID, wall thickness/schedule, length, design pressure, design temperature, and material class.
3. Piping specification with flange class, gasket/bolt material, corrosion allowance, and pressure-temperature rating basis.
4. Material certificate or material class sheet with SMYS/SMTS and toughness notes.
5. Fire-zone, fire-study, layout, or consequence documents with exposed length, heat flux, fire duration, and escalation basis.
6. PFP/fireproofing requirement and inspection records showing required endurance and whether protection can be credited.
7. Relief/thermal relief/blowdown design basis showing availability, set pressure, discharge path, and creditability.
8. Design basis or technical requirements with acceptance criteria and standards.

Write retrieval attempts, missing documents, and fallback assumptions into the manifest so neqsim-trapped-liquid-fire-rupture can include them in the final evidence matrix.

---

PDF-to-Image Extraction

After documents are in references/, convert to images for AI analysis:

import fitz  # pymupdf

def pdf_to_pngs(pdf_path, output_dir, dpi=200):
    """Convert PDF pages to numbered PNG images."""
    import os
    doc = fitz.open(pdf_path)
    base = os.path.splitext(os.path.basename(pdf_path))[0]
    paths = []
    for i, page in enumerate(doc):
        pix = page.get_pixmap(dpi=dpi)
        out = os.path.join(output_dir, f"{base}_page{i+1}.png")
        pix.save(out)
        paths.append(out)
    doc.close()
    return paths

Or use the built-in utility:

python devtools/pdf_to_figures.py step1_scope_and_research/references/ --outdir figures/

Then use view_image on extracted PNGs to read compressor curves, mechanical drawings, and data sheets.

---

Retrieval Manifest

After retrieval/classification, create a manifest for traceability:

manifest = {
    "source": "local" | "backend" | "manual",
    "retrieval_date": "2026-04-16",
    "task_type": "compressor_analysis",
    "tags_searched": ["35-KA001A", "35-KA001B"],
    "documents_retrieved": [
        {
            "filename": "performance_curves.pdf",
            "doc_type": "CE",
            "title": "Performance Curves Compressor B",
            "relevance": 1.0,
            "pages": 41,
            "used_in_analysis": True
        }
    ],
    "documents_filtered_out": [
        {
            "filename": "parts_list.pdf",
            "doc_type": "PL",
            "title": "Spare Parts List",
            "relevance": 0.2,
            "reason": "Below relevance threshold (0.5)"
        }
    ]
}
# Save as step1_scope_and_research/retrieval_manifest.json

The task solver uses this manifest to:

• Know which documents to analyze in step 2
• Skip irrelevant documents automatically
• Record data provenance in the final report

---

Task Solver Integration

Route-Level Piping Hydraulics

When retrieved STID documents include line lists, E3D route tables, stress isometrics, or P&IDs with enough line geometry, hand off the extracted route to PipingRouteBuilder for the NeqSim hydraulic model. This is the preferred path for compressor suction/discharge pressure-drop studies and debottlenecking tasks.

Required extraction fields:

Field	Purpose
segment_id	Stable line-list row id or generated route segment id
from_node, to_node	Equipment/nozzle/node topology
length, length_unit	Straight pipe length
internal_diameter, diameter_unit	Hydraulic diameter for PipeBeggsAndBrills
wall_thickness, wall_thickness_unit	Optional metadata and generated pipe wall thickness
elevation_change, elevation_unit	Static head contribution
minor_losses	Fittings/valves/reducers as K values
source_ref	Drawing number, page, row, or isometric reference

Save the extracted route table and route.toJson() in the task folder. See docs/process/piping_route_builder.md for the full builder workflow.

In task_spec.md

## Data Sources

- **Equipment tags:** 35-KA001A, 35-KA001B (export compressors)
- **Document source:** Local directory / Auto-retrieval / User-provided
- **Key documents used:**
  - performance_curves.pdf: Vendor performance maps (41 pages)
  - as_built_curves.pdf: Shop test results (4 pages)
  - general_arrangement.pdf: GA drawing with dimensions
- **Documents filtered out:** 8 (parts lists, generic specs — below relevance)

In analysis notebook

# Load retrieval manifest to know what's available
import json
manifest_path = TASK_DIR / 'step1_scope_and_research' / 'retrieval_manifest.json'
if manifest_path.exists():
    with open(manifest_path) as f:
        manifest = json.load(f)

    # Work only with relevant documents
    curve_docs = [d for d in manifest['documents_retrieved']
                  if d['doc_type'] == 'CE' and d['used_in_analysis']]
    print(f"Analyzing {len(curve_docs)} performance curve documents")

In results.json

{
    "data_sources": {
        "retrieval_method": "local",
        "documents_retrieved": 13,
        "documents_analyzed": 5,
        "documents_filtered_out": 8,
        "key_documents": [
            "performance_curves.pdf — Vendor Performance Maps",
            "as_built_curves.pdf — Shop Test Results"
        ]
    }
}

Loading into NeqSim

from neqsim import jneqsim

# Create compressor with performance curves from extracted data
compressor = jneqsim.process.equipment.compressor.Compressor("Export Comp", feed)

# If curve data has been digitized from the images:
chart = compressor.getCompressorChart()
chart.setHeadUnit("kJ/kg")
chart.setUseCompressorChart(True)

# Add speed curves (extracted from performance map)
for speed, points in curve_data.items():
    curve = jneqsim.process.equipment.compressor.CompressorCurve(speed)
    for flow, head, eff in points:
        curve.addCurveDataPoint(flow, head, eff)
    chart.addCurve(curve)

---

Manual + Auto Coexistence

Users can always add documents manually to references/, even when a retrieval backend is configured. The two approaches coexist:

step1_scope_and_research/references/
├── [auto-retrieved]    performance_curves_35KA001A.pdf    (from backend)
├── [auto-retrieved]    datasheet_35KA001A.pdf             (from backend)
├── [manual]            vendor_email_attachment.pdf         (user dropped in)
├── [manual]            field_test_report_2025.xlsx         (user dropped in)
└── [manual]            photo_nameplate.jpg                 (user dropped in)

The retrieval manifest tracks the source of each document:

{
    "documents_retrieved": [
        {"filename": "performance_curves.pdf", "source": "backend", "doc_type": "CE"},
        {"filename": "vendor_email_attachment.pdf", "source": "manual", "doc_type": "RE"},
        {"filename": "field_test_report_2025.xlsx", "source": "manual", "doc_type": "DS"}
    ]
}

Rules:

• Manual documents are never overwritten by auto-retrieval
• Manual documents are classified and relevance-scored the same way
• The agent should ask "Do you have additional documents to add?" before leaving Step 1 (scope & research)
• During analysis, the user can drop more files in references/ at any time; the agent should re-scan the folder if it detects new files

---

Iterative Retrieval During Analysis

The initial retrieval in Step 1 may not cover everything. During Step 2 (analysis), the agent may discover it needs additional documents — for example:

• Found performance curves but needs mechanical drawing for nozzle dimensions
• Analyzing compressor A but needs data for compressor B (parallel train)
• Needs P&ID to understand upstream/downstream connections
• Needs instrument datasheets to set up control system model
• Needs material certificates for corrosion/fatigue analysis

How It Works

When the agent identifies a data gap during analysis, it follows this protocol:

1. Log the gap — record what's missing and why in the notebook:

   # DATA GAP: Need mechanical drawing (AA) for 35-KA001A to get
   # nozzle sizes for piping stress analysis. Current docs only have
   # performance curves (CE) and datasheet (DS).
   

2. Attempt auto-retrieval (if backend configured):

   # Mid-analysis retrieval for additional document types
   from devtools.doc_retriever import retrieve_documents
   
   additional = retrieve_documents(
       tags=['35-KA001A'],
       doc_types=['AA', 'MD'],  # specifically what's missing
       output_dir='step1_scope_and_research/references/'
   )
   if additional:
       print(f"Retrieved {len(additional)} additional documents")
       # Re-extract PNGs for new documents
       # Update retrieval manifest
   

3. Ask the user if auto-retrieval is unavailable or returned nothing:

   **Data gap identified:** I need the General Arrangement drawing (AA) for
   35-KA001A to extract nozzle dimensions. Options:
   - Drop the PDF into `step1_scope_and_research/references/` and I'll continue
   - Provide the dimensions directly (suction nozzle OD, discharge nozzle OD)
   - Skip this analysis (I'll use typical values with a note on uncertainty)
   

4. Update the manifest with the new retrieval:

   manifest['iterative_retrievals'] = manifest.get('iterative_retrievals', [])
   manifest['iterative_retrievals'].append({
       "phase": "step2_analysis",
       "reason": "Need nozzle dimensions for piping stress",
       "doc_types_requested": ["AA", "MD"],
       "tags": ["35-KA001A"],
       "documents_found": ["general_arrangement_35KA001A.pdf"],
       "source": "backend"  # or "manual" or "user_provided_value"
   })
   

5. Continue analysis with the new data, or proceed with documented assumptions if the document isn't available.

Data Gap Detection Triggers

The agent should check for data gaps at these points:

Trigger	Example Gap	Action
Missing physical dimensions	No GA/MD drawing → can't size equipment	Request AA/MD docs
Missing operating conditions	No datasheet → unknown design pressure	Request DS docs
Upstream/downstream unknown	No P&ID → can't model recycles	Request PI docs
Control system needed	No instrument sheets → can't set PID params	Request IN docs
Parallel equipment	Only train A data, need train B comparison	Request docs for tag B
Material unknown	No material cert → can't check corrosion	Request SP/material cert
Vendor corrections needed	Shop test vs predicted curves differ	Request test report (RE)

---

Equipment Naming Conventions (NORSOK Z-001)

Standard tag naming for Norwegian continental shelf installations:

Prefix	Equipment Type
KA	Compressor
PA	Pump
VA	Valve
FA	Fan
HA	Heat exchanger
DA	Vessel / Separator
BA	Tank
GA	Generator
MA	Motor
XA	Special equipment

---

Backend Configuration (Gitignored — Not Public)

To enable auto-retrieval, create devtools/doc_retrieval_config.yaml. This file is in .gitignore and never committed to the public repo.

# devtools/doc_retrieval_config.yaml
# THIS FILE IS GITIGNORED — contains organization-specific configuration
#
# Supported backends:
#   stidapi  — STID document management (requires stidapi package + network)
#   local    — just reads from a local directory
#   none     — disabled (user must provide docs manually)

backend: none   # change to: stidapi, local

# Backend-specific settings (only needed for auto-retrieval):
# stidapi:
#   auth_method: azure_ad_sso
#   default_inst_code: YOUR_INST_CODE

If this file doesn't exist, the task solver works normally — it just expects documents in references/ instead of auto-fetching them.

---

Related: STID Tags → Plant Historian → CSV

When STID retrieval identifies equipment tags (e.g., 35-KA001A), the same tags can be used to read operating data from the plant historian (OSIsoft PI / Aspen IP.21) via tagreader, and the data should be saved as CSV inside the task folder for reproducibility.

The full pipeline is documented in the neqsim-plant-data skill:

STID (tag search) → Tagreader (historian read) → CSV (snapshot) → NeqSim (simulation)

See the "STID → Tagreader → CSV → NeqSim Pipeline" section in that skill for the complete end-to-end example with CSV persistence, data quality filtering, and digital twin comparison — all saved to the task folder.