Hi,
Is galvanizing full length of anchor bolts necessary for galvanized bolts or galvanizing the protruded portion only will suffice.
Any guidance is appreciated.
Regards,
Tabby
Thnx Mike. It is all clear to me now.
Duwe, I think the value of 918 psig u r referring to as Design Pressure is acutally the MAWP for the pipe and 125 is the DP which is also allowed to be marked MAWP for the HX. HX shop may take higher thickness pipe if it costs less but they wont be...
You mean even if the calculations for actual MAWP are made by software or by someone, designer or someone must endorse them for the AI to consider stamping vessel against actual MAWP.
Obviously someone who would endorse them would demand more. So extra cost must be spent to rate the vessel...
Wow Mike. It is exactly as you described. The MAWP has been calculated by the software and also tabulated later in report. I could'nt have guessed that this also has to do something with Code requirements or I wud have mentioned this at the beginning.
So now I conclude that if MAWP calcs are...
Well it says that MAWP can be assumed to be equal to DP if calculations are not performed.
But problem is,
Calculations have been performed for all parts and still the DP is marked as MAWP. Does it violates ASME VIII DIV 1 or is it allowed somehow or by some para of the code?
Regards,
Tabby
Hi All,
I was searching ASME Section VIII Div 1 for a provision that MAWP can be taken as Design Pressure i.e
MAWP = Design Pressure
Even if MAWP is calculated during design calculations (Obviously its value is higher than DP). However, I coudn't find one. So, I thought someone here could...
Lets say order is an A358 pipe with Nominal Wall Thickness of 7.62 mm.
Then if the thickness at a place is found 6.65 mm, it is within the B31.3 code limitis.
But is it within the ASTM A358 specifications? Please
Regards,
Tabby
Hello Everyone,
I was modeling on AutoPIPE when I came across mill tolerance.
According to my understanding, Mill Tolerance is the tolerance for variation in the thickness of pipe from nominal pipe thickness which is 12.5% according to B31.3. i.e for NPS 10" and thickness 6.35 mm it is 0.794...
Hi All,
Would any of you be kind enough to confirm me the following.
If material of the pipe is A358 TP 321 Class 2 EFW
A358 Specifications Quote
"1.3.2 Class 2—Pipe shall be double welded by processes
employing filler metal in all passes. No radiography is required."
Then
For Piping...
Thanks everyone. It was really helpful. I found some data in Urea symposiums and IFA conferences reports. Actually the situation wants me to have some literature reference.
Regards,
Tabby
Dear All,
Can anyone guide me to some reference (books, web, etc) where I can find the negative effects of Frequent Start-up/Shutdown on Equipments Used in Fertilizer Industry such as pressure vessels, heat exchangers, piping, valves, compressors, pumps, turbine, etc? Please.
Regards,
Tabby
@DSB123,
Well there is this procedure in TEMA RCB 8.
First an FEA is performed in order to determine displacement for spring rate calculation.
Then, this spring rate is used to calculate the induced axial displacement which is used in second FEA to determine stresses.
But to calculate...
Hello everyone,
I was trying to perform a finite element analysis of a heat exchanger expansion joint on ANSYS following RCB 8 of TEMA. I modeled it according to Figure RCB 8.42, applied boundary conditions as per RCB 8.41 and determined spring rate. Now to determine deflection to be applied...
