Assemble a loop folder.
From the P&ID + datasheet + cable schedule + JB schedule to a per-loop commissioning package
Assembling a loop folder is the engineering process of pulling every artifact related to a control loop into a single per-loop commissioning package: the P&ID page showing the loop, the per-instrument datasheet, the loop diagram, the cable schedule entries for the loop feeders, the JB schedule entries for the loop terminations, and a loop-check verification sheet. The loop folder is the document the commissioning electrician walks the loop against on site, the document the operator references during startup, and the document archived in the as-built record. A typical brownfield retrofit produces 200 to 800 loop folders; a greenfield grassroots project can produce thousands.
Inputs.
- +P&ID set
- +Instrument index (extracted or supplied)
- +Per-instrument datasheet binder
- +Loop diagrams (one per loop or per loop type)
- +Cable schedule
- +JB schedule
Outputs.
- →Per-loop folder cover index (loop number, service, source P&ID, datasheet ref, cable tag, JB terminal)
- →Loop-check sheet template populated per loop
- →Master loop register filtered by area or by commissioning sequence
- →Export targets: Excel workbook (per-area), PDF binder (per-loop), JSON for the commissioning tool
| Document | Loop folder contribution | Per-loop row in the index |
|---|---|---|
| P&ID page | Visual loop topology | Source P&ID page reference |
| Instrument index | Tag, type, signal class, loop number | Loop number column join |
| Per-instrument datasheet | Vendor / model / range / calibration | Datasheet ref column |
| Loop diagram | Wiring sequence sensor → solver → final element | Loop diagram ref column |
| Cable schedule | Feeder cable + terminal references | Cable tag column |
| JB schedule | JB terminal block + wire numbers | JB terminal column |
| Loop check sheet | Per-loop commissioning verification | Generated per loop number |
Step by step.
- 01
Establish loop universe
Extract the I/O list or instrument index from the P&ID set. The loop number column establishes the loop universe; non-loop instruments (indicators only) flag as such.
- 02
Pull the loop diagram references
Loop diagrams in the workspace cross-reference by loop number. The loop folder index carries the loop diagram drawing reference per row.
- 03
Tie cable + JB schedules
Cable schedule rows with the loop-feeder reference and JB schedule rows with the loop-termination references join into the per-loop entry. The wire-number sequence walks sensor through final element.
- 04
Populate datasheet references
Per-instrument datasheet linkage carries the calibration data, vendor data, and serial number when populated.
- 05
Generate loop check sheets
Per-loop verification sheet populated with the loop topology. The commissioning electrician fills the field-verified columns as the loop is walked.
- 06
Export for commissioning
Per-area Excel workbook or per-loop PDF binder. The JSON export drops into a commissioning database (CompEx, Bechtel BCMS, in-house tools).
Common questions.
How many loop folders does a typical project produce?
A brownfield retrofit produces 200-800 loop folders; a greenfield grassroots produces thousands. Per-area filtering and per-system filtering let the commissioning manager sequence the binder build to the commissioning schedule.
Do loop folders need a loop diagram per loop?
Not always. Many projects ship a loop diagram per loop type (4-20mA flow loop, HART pressure loop, RTD temperature loop) and reference the loop type per loop. The loop folder index supports both per-loop and per-type references.
Can this drop into the commissioning database?
Yes. JSON export carries the per-loop dataset with the field-verified columns left blank for the commissioning electrician to fill on site. Custom column shapes for Bechtel BCMS, Worley CompEx, and in-house tools are configurable through the API or MCP server.
Start a workspace.
Upload the source documents, run the workflow, ship the document in the column shape the next consumer expects.