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Field notes on P&ID extraction, ISA 5.1, and instrumentation engineering.
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TEMA vs API 660, How the Two Standards Fit TogetherJuly 2026What is the difference between TEMA and API 660? TEMA governs exchanger mechanical design, and API 660 is the refinery purchase spec built on it.Tie-In Points and Where New Work Meets the Existing PlantJuly 2026A tie-in point is where new work connects to the existing plant on a brownfield project, and it drives the shutdown schedule and the tie-in register.When a LOPA Needs RevalidatingJuly 2026LOPA revalidation is triggered by an MOC, a new SIF, an incident, or a changed IPL. What it demands of the P&ID, the SIF register, and the I/O list.Alarm Rationalization: From P&ID Alarms to an ISA 18.2 Alarm ListJuly 2026What alarm rationalization is, the ISA 18.2 lifecycle in plain words, and how P&ID alarms become a master alarm database of justified, prioritized rows.BPCS and SIS: Keeping the Layers SeparateJuly 2026BPCS controls the plant and the SIS protects it. What keeps them independent under IEC 61511, and how the separation reads on the P&ID and the I/O list.The HVAC Equipment Schedule: The Columns That MatterJuly 2026The columns that belong on an HVAC equipment schedule, a worked example by equipment type, and where the schedule comes off the mechanical drawing set.Loop-Powered vs Field-Powered TransmittersJuly 2026Loop-powered and field-powered transmitters compared: 2-wire versus 4-wire, the loop voltage budget that decides it, and what changes on the I/O list.PROFINET and PROFIBUS on the I/O ListJuly 2026PROFIBUS and PROFINET put many devices on one segment. How a networked device differs from a hardwired point, and how to list it without double-counting.Running a Technical Bid Evaluation for an Instrument PackageJuly 2026How to run a technical bid evaluation for an instrument package: what the TBE checks against the datasheet, the TBE sheet columns, and how it gates the CBE.Pulling Power-Meter Points off Data Center EPMS One-Lines into a PUE RegisterJuly 2026How to pull utility, UPS, PDU, and RPP power-meter points off data center EPMS one-lines and build the power-metering register that feeds a PUE calculation.How to Build a BMS Points List from HVAC Control DrawingsJuly 2026How to create a BMS points list from HVAC control drawings: AI/AO/BI/BO typing, BACnet object mapping, equipment-relative tags, and trunk assignment.The Dutch HVAC Tag Dialect. NEN-EN-IEC 81346 Kenletters, DecodedJuly 2026Kenletters on a Dutch klimaat or regeltechniek schema. The class table, a tag decoded block by block, and house codes such as VB for vorstbeveiliging.
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