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	Preliminary Hazard Analysis	Hazard and Operability Study (HAZOP)
Odbor	Disaster Studies	Disaster Studies
Rodina	Process / pipeline	Process / pipeline
Rok vzniku	2008	2016
Tvorca	Military system-safety practice (MIL-STD-882); codified in CCPS guidelines	ICI (1960s practice); codified in IEC 61882 and CCPS guidelines
Typ	Early-stage qualitative hazard identification and ranking	Structured guide-word deviation analysis of process designs
Pôvodný zdroj	Center for Chemical Process Safety (CCPS). (2008). Guidelines for Hazard Evaluation Procedures (3rd ed.). Wiley-AIChE, Hoboken, NJ. ISBN: 9780471978152	International Electrotechnical Commission. (2016). IEC 61882:2016 Hazard and operability studies (HAZOP studies) — Application guide (2nd ed.). IEC, Geneva.
Ďalšie názvy	PHA, Preliminary Hazard List Analysis, Early Hazard Analysis, Conceptual Hazard Analysis	HAZOP Study, Hazard and Operability Analysis, Guide-Word HAZOP, Deviation Analysis
Príbuzné	3	3
Zhrnutie	Preliminary hazard analysis, or PHA, is an early-stage, qualitative technique for identifying the hazards inherent in a system before its design is detailed enough for more rigorous methods, and for ranking those hazards so that the riskiest receive attention first. Conducted in the concept or preliminary design phase, it works from the system's energy sources, hazardous materials, intended functions and operating environment to compile a hazard list, postulate how each hazard could lead to harm, and assign each a risk level from severity and likelihood ratings. The CCPS Guidelines for Hazard Evaluation Procedures present it as a foundational hazard-evaluation method, and ISO/IEC 31010 includes it among standard risk-assessment techniques. Because it is applied when changing the design is still cheap, the PHA's chief value is steering early design decisions and identifying which hazards warrant deeper study by methods such as HAZOP, FMEA or quantitative risk assessment.	A Hazard and Operability Study, or HAZOP, is a structured, team-based examination of a process design that systematically searches for deviations from the design intent and judges whether each deviation could create a hazard or impair operability. Its signature device is the guide word: terms such as 'No', 'More', 'Less', 'Reverse' and 'Other than' are combined with process parameters like flow, pressure and temperature at each part of the system to provoke a complete and disciplined set of 'what if it went wrong this way?' questions. IEC 61882 is the international application guide that defines the technique, its guide words and its workflow, while the CCPS Guidelines for Hazard Evaluation Procedures situates HAZOP among the core hazard-evaluation methods of process safety. The method's power lies in its rigorous, qualitative completeness: by walking every node and every guide word, a multidisciplinary team aims to leave no credible deviation unconsidered.