Recognized and Generally Accepted Good Engineering Practices (RAGAGEP)
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Recognized and Generally Accepted Good Engineering Practices (RAGAGEP) Paul Daniel
RAGAGEP and ASME Pressure Equipment
OSHA recently clarified what is meant by the term RAGAGEP and its proper application per 1910.119(d)(3)(ii). For the case of pressure equipment such as ASME vessels and heat exchangers, it essentially instructs the employer to identify and use the applicable consensus standards when preparing documentation to show compliance with the Process Safety Management (PSM) standard. For ASME pressure vessels and heat exchangers, the basic safety codes are ASME Section VIII, Divisions 1 and 2. Because ASME VIII is a new construction document and PSM addresses post construction use, additional specific standards are applicable including API-510 (vessels), API-570 (piping), API-653 (tanks) and API-579 (FFS). Note that in all cases, the API documents refer back to the original Code of construction (ASME VIII-1, VIII-2, B31.3, B31.4, TEMA). RAGAGEP requires that the most recent API document be used as they are regularly updated to reflect newly acquired information regarding damage mechanisms, operating experience and inspection technologies.
For example, RAGAGEP IS:
Using all the provisions from the most recent applicable consensus standard, the correct allowable stress and joint efficiency etc.
Considering all the loads acting on the equipment. In addition to pressure, these include static liquid head, weight, wind and seismic loads on the pressure vessel and its supports as well as (piping) loads on nozzle attachments.
Considering brittle fracture as a failure mode for carbon steel equipment using ASME VIII-1 paragraph UCS-66 or API 579 Part 3. This may, for example, affect equipment start-up and field hydrotest conditions.
Implemented in INSPECT.
And RAGAGEP is NOT:
A simplistic internal pressure formula for calculating Tmin or ignoring the external pressure Tmin (a very involved calculation).
A nozzle Tmin arrived at by only considering ASME VIII-1 paragraph UG-45. Area replacement, proximity to other openings and more must be taken into account.
Black box computer output with no way to verify (audit) the correctness of the calculations performed.
Using an outdated version of API RP 579/ASME FFS-1 for fitness-for service evaluations.