Assemble a loop folder.
From the P&ID plus datasheet plus cable schedule plus JB schedule to a per-loop commissioning package
What this covers.
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
Loop folder inputs by source document
| 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 to solver to final element | Loop diagram ref column |
| Cable schedule | Feeder cable plus terminal references | Cable tag column |
| JB schedule | JB terminal block plus wire numbers | JB terminal column |
| Loop check sheet | Per-loop commissioning verification | Generated per loop number |
Step by step.
- 01Establish loop universeExtract 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.
- 02Pull the loop diagram referencesLoop diagrams in the workspace cross-reference by loop number. The loop folder index carries the loop diagram drawing reference per row.
- 03Tie cable plus JB schedulesCable 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.
- 04Populate datasheet referencesPer-instrument datasheet linkage carries the calibration data, vendor data, and serial number when populated.
- 05Generate loop check sheetsPer-loop verification sheet populated with the loop topology. The commissioning electrician fills the field-verified columns as the loop is walked.
- 06Export for commissioningPer-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.
Do loop folders need a loop diagram per loop.
Can this drop into the commissioning database.
Related.
Start a workspace.
Upload the source documents, run the workflow, ship the document in the column shape the next consumer expects.