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Thanks.. JStephen.

UG-20 (c) states ""design temperatures for vessels under external pressure shall not exceed the maximum temperatures given on the external pressure charts." Sec IID,Appendix-3,Fig-3-500.1 shows the temperature limitation for each material for the actual r/t ratio. For my case I have material...

Thansk so much for answering as I could never guess the meaning here. My other query is on design life criteria.. Usually you must have seen the design criteria stating " 1% creep in 100000Hrs". What I understand if equipment is operating under creep range and may have faced one or more...

@metengr (Materials) Please check my query again ..it is on how to work out allowable stress and what is the base of stresses given for the material in italics /creep range temperature in IID. For a moment, please ignore my original query and pls try to answer my query below each consideration...

@metengr (Materials) Will appreciate your reponse on my last post.

Thanks metenger for taking out time to respond, just few more points to be clarified; on the Level 1 screening, when or beyond which tmeperature graphitisation curves shall be referred. Can the same MOC i.e. SA 516 Gr 70 or SA 106 gr B cam be used by adding Mo or will it change the designation...

Thanks and really appreciate for the replies made. Yes I also do concerned about use of CS at these temperature. However just to investigate in details, pls advise me on the following which are extended part of my original query; 1.Advise the difference between Level-1screening curves provided...

Thanks for the response on this. Just to clarify,the query is about the design of Internals inn new equipments. referring API 579 as it is referred for creep evaluation. Equipment will be refractory lined but internals will be exposed to high temperatures as stated in my query. The Internals...

Need to evaluate creep damage in carbon steel (SA 516 Gr 70/SA 106 Gr B) at 650°C short term exposure (~150Hrs@ 650°C, balance life@ 565°C in total life of 100000 Hr).ASME IID gives allowable stresses up to 550°C but doesn't permit use beyond 538°C. Similarly thruogh API 579 FFS-1, table F.2...