Correct positioning relative to control valves, elbows, and pumps to eliminate swirl and cavitation. 4. Temperature Measurement
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to keep flammable gases out of instrument housings. Material Compatibility and Corrosion Control Petroleum processing frequently involves sour crude ( H2Scap H sub 2 cap S
API RP 551 is a , meaning it provides industry-endorsed guidelines, procedures, and best practices rather than strict, enforceable requirements. The second edition, published in February 2016 , is the most current version. This edition was reaffirmed in 2024, confirming that its technical content remains relevant and valid. The standard is also available in both English and Russian. api rp 551 pdf
| Standard | Focus | Relationship to RP 551 | | :--- | :--- | :--- | | | Flow measurement by orifice plates | RP 551 references ASME for primary element calculations | | ISA-5.1 | Instrumentation symbols and diagrams | RP 551 assumes you use ISA bubble diagrams | | API RP 552 | Transmission systems (signals) | Companion document – install transmitters (551), then route signals (552) | | API RP 553 | Refinery control valves | Separate but often used in tandem for loop design | | IEC 61511 | Functional safety | RP 551 provides measurement-specific details for SIS |
Utilizing inert gas purges to protect delicate electronic housings from corrosive process vapors. Signal Integrity and Wiring
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Correct positioning relative to control valves, elbows, and
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: It outlines physical piping configurations that eliminate false readings caused by turbulence, vibration, or temperature fluctuations. Key Measurement Technologies Covered
No. It is a recommended practice. However, OSHA’s Process Safety Management (29 CFR 1910.119) requires that equipment be built to “recognized and generally accepted good engineering practices” (RAGAGEP). API RP 551 is frequently cited as RAGAGEP in court and during incident investigations. In practice, it functions as mandatory for liability protection. The standard is also available in both English and Russian
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This is the most referenced section. It covers:
is a technical document that covers the installation and functionality of process measurement instruments. It primarily focuses on: Temperature Pressure Flow Level