Api Rp 551 Pdf ((hot)) ✮

(Recommended Practice for Process Measurement) is a comprehensive guide produced by the American Petroleum Institute that outlines best practices for the selection, design, and installation of process measurement systems in the oil and gas industry.

While IEC 61511 covers overall functional safety, RP 551 clarifies how primary measurement devices should be separated from control system transmitters to maintain redundancy without common-cause failures.