Allowable loads on nozzles for pressure vessel 1

[HOUARI YAHIAOUI]

Hello experts
my question is about allowable loads on nozzles for pressure vessel.
the standard of the company wich I work at, has tabular alloawble values of forces (Fa,Fc,Fl) and moments (Mt,Mc,and Ml) according to flange rating.
The problem is when I choose to analyse loading for nozzles using Pv elite with the WRC 107 code, I found that there is three categories for loads on nozzles :
1.Substained
2.Expansion
3.Occasional
In our standard there is no mention of the category of the tabular loads. hence I guess that the tabular loads are substained loads normally, so what about the two other categories, how do I to obtain the limit values for forces (Fa,Fc,Fl) and moments (Mt,Mc,and Ml) to enter in pv ellite in order to analyse loads?

 

[DK44]

1. As per my client's specification, Nozzle loads to WRC 107 / 296 to be performed for sustained loads (100 % of given minimum loads) and also occasional loads (50% of given minimum loads) together.

2. Does PV Elite has provision to give the input for both the above loads and perform calculations together (simultaneously).

 

[Trestala]

DK44,

You can input sustained and occasional loads separately in their WRC 107 input, as well as thermal loads. PVElite will then perform WRC 107 calculations separately then combined them for evaluation (see sample output I pasted above). However, TGS4 mentions that PVElite implementation of WRC 107 to ASME VIII-2, Part 5 is incorrect.

 

[DK44]

Thank you Raymond.

While PV Elite has the provision for input of Sustained and Occasional loads together for WRC 107 analysis (for Nozzles on Dished Heads), kindly advise as to how to input simultaneous loads (sustained and occasional) in PV Elite for WRC 296 analysis (for Nozzles on Cylindrical Shells).

 

[Trestala]

DK44,

I've checked and WRC 297 of PVElite doesn't categorize between Sustained, Occasional, and Thermal. They only use it on WRC 107. Loads are considered as sustained.

Regards,

 

[DK44]

Dear Raymond.
Is there any future plan of PV Elite to consider Nozzle load calculations to WRC 296 (to analyse Nozzle loads on Cylindrical shells) with simultaneous Sustained + Occasional + Thermal loads as that of WRC 107.

 

[KevinNZ]

Hi

I have opened this thread again because I have found this very useful video.

https://www.youtube.com/watch?v=WTQMgGeUgwQ

 

[SnTMan]

...for WRC 107 analysis (for Nozzles on Dished Heads),...

I don't know where this whole discussion stands, but I'd like to point out that WRC 107 applies to nozzles on cylinders as well as spheres.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand