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Field notes on P&ID extraction, ISA 5.1, and instrumentation engineering.

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March 2026

How to Extract Instruments from a P&ID PDFTurn a P&ID PDF into a reviewed I/O list. Scan resolution, flattening, page orientation, dense-sheet handling, and the rows to check before export.P&IDI/O List

February 2026

ISA 5.1 Instrument Tags. Letter Codes and Signal TypesHow ISA 5.1 instrument tags are built. The first letter, modifier and succeeding letters, and how to read AI, AO, DI, and DO signal types straight off a P&ID.ISA 5.1Reference
Marshalling cabinet sizing from an I/O list. The rules that survive the fieldHow to size marshalling cabinets from a structured I/O list, with the terminal-density rules, intrinsic-safety zoning, and SIS and BPCS separation that drive cabinet count on a real plant. Written for the I&C engineer producing the panel scope.Cabinet sizingMarshallingBid estimation

December 2025

PLC card sizing from a P&ID. The math, the rules, and what to bake into your bidWalkthrough for going from an extracted I/O count to a PLC card-sizing rollup. Covers the channel-density math, vendor differences, spare-capacity rules, and the gotchas that show up between the bid spreadsheet and the real cabinet.PLCCard sizingBid estimation

November 2025

Validating an I/O list against P&IDsWhy I/O lists drift from drawings, what discipline keeps validation tractable, and what the MOC change report needs to contain.I/O listValidationMOC

October 2025

DCS migration. Reconstructing current scope from P&IDsWhy DCS migration discovery work overruns, what the as-built scope actually means, and how to keep the discovery phase from blowing the schedule.DCS migrationBrownfieldReference

September 2025

Counting instruments on a P&ID without missing scopeWhat counts as an instrument on a bid I/O count, how to handle redundant pairs, what to ignore, and the tag-suffix patterns that flag scope you would otherwise miss.I/O listBid estimationISA 5.1

August 2025

What Changed in ISA 5.1-2022 for I/O ListsISA 5.1-2022 is the first major revision in over a decade. The biggest changes are clearer conventions for digital and shared-display instruments, refined panel-mounting symbology, and updated function-block notation. Here is what to update on your house standard.ISA 5.1StandardsReference

July 2025

Reading Legacy 1980s P&IDs. A Digitizing GuideBrownfield drawing sets from the 1980s use conventions that are not always backward-compatible with modern ISA 5.1. Here is what the older drawings get right, where they confuse modern engineers, and how to produce a clean digital instrument index from them.BrownfieldLegacy P&IDISA 5.1

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