@LittleInch is there a provision in B31.3 referencing -60 C as a tested temp for A333 Gr6?
@goutam_freelance any other external load will need to be considered as well? As for the ratio I can use the basic allowable at min temperature? Or because there is thermal effects in this load case I...
Thank you everyone for your responses.
@georgeverghese what software would our process engineer use?
@LittleInch if we do additional testing such as impact testing we will be ok at designing to -55 F?
@goutam_freelance by combined stress do they mean the operating load case with Weight...
Hello,
We are planning on using A333 Gr 6 piping in our design. The MDMT in B31.3 is -50 F and we have design conditions that may reach -55 F. I was told by by using the load case referenced
in B31.3 323.2.2 (a)(3) below and by reaching a stress ratio no greater the 0.95 that A333 Gr 6...
Thanks for everyone's insight, it is very informative.
@RVAmeche I agree as I look through different forums and there's always an agreement that the high loads aren't always realistic due to different factors (gasket compression, nozzle stiffness being lower than Caesar's typical anchor). I...
@RVAmeche I see, thank you for your thoughts.
@LittleInch thank you for your insight, I'll try to restrain in the X plane without transferring loads/movement in the Z axis. As for the 1mm is that applied as the gap at the anchor point for the pump nozzle? To be more realistic, should this...
@Snickster and @XL83NL thank you for referring me to the attached threads.
@LittleInch thank you for the attached sketch, I'll check with my designers if that is a layout we could possibly try since we are pretty close to grade and have the discharge crossing over the suction header. Could I...
Hello,
I am working on stress on pump suction piping coming from a tank. I am seeing high moments and nozzle loads on my pump during hot and cold operation. I believe the issue is with how my header is growing and contracting during the 2 cases, so I was wondering the best way to restrain...
@Snickster Ahh I see, I'll have to do the check outside of the stress analysis, thank you very much.
@r6155 and @GBTorpenhow I also appreciate the discussion and concern about welding to the pipe itself. Unfortunately we do need these types of dummy legs due to configuration of piping in...
@LittleInch Yes pipe welded to elbows but in some cases to the side of the pipe like a trunnion. Thank you for your input much appreciated!
@GD2 Not welding the pipe to supports but welding steel to piping for structural support like dummy legs. Either pipe or in some cases even a beam. I...
Hello LittleInch,
Thank you for your insight. Our piping is supported on rack, with dummy legs used on elbows throughout the layout.
With absence of licensing for FEA software, would hand calcs be suitable? I was told Kellogg method could be used for checking and that some excel file out there...
Hello, We have SCH10S piping and have various structural supports welded to it (dummy legs, base supports, etc.) Because it is thinner pipe, do we need to include repads? Concern would also be the weld burns through the thin wall.
Will CAESAR II be able to check this somehow? Or what...
@LittleInch could you explain your modeling technique with anchoring/line stop close to the pump nozzle and flange as free ends? Using the nozzle limit check function it has to be applied to an anchor so how would I be able to check the flange? How can I review forces on that node with no restraint?
