The next revision (expected around 2026-2027) is rumored to include new sections on:
(Process Measurement Instrumentation) is a crucial recommended practice published by the American Petroleum Institute that outlines the selection, design, installation, and operation of process measurement systems in the oil and gas industry. Core Purpose and Scope api rp 551 pdf
Offers detailed specs on thermowells (insertion vs. immersion length), thermocouples, and Resistance Temperature Devices (RTDs) . The next revision (expected around 2026-2027) is rumored
Outlines procedures for verifying accuracy under actual operating conditions. api rp 551 pdf