During a plant turnaround (shutdown for maintenance), engineers need instant offline access to wiring diagrams and logic matrices. A printed book may be locked in an office, but a PDF can be viewed on a tablet in the field.
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API RP 556 is a recommended practice for the design, installation, and operation of instrumentation and control systems for fired equipment in petroleum and natural gas production, processing, and transportation. suggestion:"API RP 556 PDF download"