Hi.
according to ASME Viii Div2 Figure 5-1
the criteria for Sum of PL+PB+Q+F is 2x Sa.
I always consider my maximum stress to be less than it.
But in 2017 version, this criteria was just Sa.
Am i right?
MJCronin,
Fitting size is 56'' and material actual ultimate strength is 100ksi (api 5L X65).
Design temp. Is 185F.
And The hot tap Tee is going to produce from 1.125'' plate.
Thanks Marty007.
And more thanks for DriveMeNuts although i am note completly agree with your interpretations and conceptions.
And still waiting for Tgs4 if any good news has come from Code Committee Meeting.
Regards
marty007,
I agree with you but the business is cruel!
The only way for me is using Class2 (according to successful experiences) and meet the requirements of it.
Note that Our projects have a consultant company who checked calculations and inspections. Also we perform NDT; heat treatment...
DriveMeNuts,
If i do a FEA on a part with design factor 3.5 (AS you addressed in ASME PTB-4), so...
when do you use CLASS 2 with S.F=2.4 in your analysis?
I have checked lots of products from famous European manufacturers with FEA and most of them will fail if we use S.F=3.5. For example most...
TGS4,
If you decide to design and construct a 'quick opening closure' or something else like 'Split Tee' with finite elemnt analysis, what will be your CLASS and related ß factor? Think that there is no USD and you design it for yourself!!
Although the Question is ridiculous but your answer is...
I thank all of you for spending time.
TGS4, i trust you and believe in your knowledge. But what about my real experiences in construction?
I have been design and construct lots of equipments like quick opening closures via FEM and S.F=2.4 and they are working without any problem. In my cases...
You are right.
General vessel designs according to div1 with S.F=3.5. Ustamp is for this part.
But some parts of vessel doesn't have exact rule in vessel in div1 (such as special quick openings) and should be calculated according to div2-part5 with SF=2.4.
DriveMeNuts, i appreciate your kind attention.
Like Eu we have Native standard but not for Finite element analysis.
Note that We have to approve MDR by independent consultant company. َFurthermore, we consider all ASME criteria, examinations and NDT except PE certification. Also we have our...
One more question:
What about PE certification? During these years we never engaged Professional Engineer to certify the UDS or MDR because it's not mandatory in my country. Note that i live in Asia. Also User's UDS is not update with new rules and classes.
Isn't there any conflict to choose...
Wonderful. Thanks TGS4.
Please explain a little more for the method to choose classes. I have to satisfy client.
Note that i am designing some special parts which don't have clear rule in part4.
Also Do you mean beta for Ω sign?
Hi,
As you know, in edition 2017 of asme viii-2, it has introduced the classes for vessels which made some challenges for me.
According to edition 2015 part5, I always perform FEA with S.F=2.4 and in E-P analysis, load factor 2.4. But in new edition, it seems that i have to consider my cases in...
Littleinch,
1-What do you mean by sh1t?
2- I have calculated proof test pressure from para. 4.3 not 2.2! Because we have to perform a proof test.
3-my problem date is here:
- Attached pipe thickness =31.75 for api 5L X65
- Tee 56' thickness = 40 mm
- Actual tensile strength =616mpa so...
