Nozzles In Elliptical Head Knuckle Region
Nozzles In Elliptical Head Knuckle Region
(OP)
Hi Folks
Any words of wisdom with regard to the design of nozzles (pressure vessel) which are located in the zone outside of 80% of the elliptical head diameter (other than don't put them there). The reinforcement issues seem reasonably manageable but it seems to be a bit dicey as the nozzle approaches the knuckle region. Does the Code deal with this anywhere specifically?
R
Any words of wisdom with regard to the design of nozzles (pressure vessel) which are located in the zone outside of 80% of the elliptical head diameter (other than don't put them there). The reinforcement issues seem reasonably manageable but it seems to be a bit dicey as the nozzle approaches the knuckle region. Does the Code deal with this anywhere specifically?
R





RE: Nozzles In Elliptical Head Knuckle Region
RE: Nozzles In Elliptical Head Knuckle Region
If the nozzle has no piping loads, e.g. instrument nozzles, tr in the reinforcement calcs of UG-37 should be determined by UG-32(d) or Appendix 1-4(c). This is in accordance with ASME Interpretation VIII-1-98-117:
If the nozzle has piping loads, I suggest that FEA be performed.
RE: Nozzles In Elliptical Head Knuckle Region
R
RE: Nozzles In Elliptical Head Knuckle Region
Yes reinforcement calculations were done utilizing that methodology.
Good point on the loading, although I am told the loadings are not significant...although perhaps that doesn't apply in this situation
Also I owe you a beer, they successfully used the flexible plugs (pigs) to clear the residual air out of the heater coils and were thereby able to perform a hydro test and avoid the whole issue of a pneumatic test
Thanks
R
RE: Nozzles In Elliptical Head Knuckle Region
http://www.eng-tips.com/viewthread.cfm?qid=67661
I think that the ASME code could be made clearer on this obvious issue
RE: Nozzles In Elliptical Head Knuckle Region
R