SecVIII UG37 h:nozzle projects beyond inner surface of vessel wall 1

[termoguven]

ASME Sec VIII, UG37(a) Defines
"h" is distance nozzle projects beyond the inner surface of the vessel wall.
when we insert plain cut-end pipe to cylindirical shell,
is "h", the length measured from center axis of pipe,
or
is "h", the minimum length measured at the edge of pipe?

 

[Shmulik]

Hi,
“h” is the minimum length !
Please look at Fig. UG-37.1 - it indicates: “use smallest value”.
You can also see it from that the section in this figure is in axial direction.

Regards.

 

[jamesl]

The nozzle reinforcement rule is based on cross-section areas. Due to the use of F-factor, the cross section along the longitude shell axis governs the calculation as long as the nozzle is radial (not hillside). Therefore, you should use the h measured from center of pipe. The "use smallest value" in Fig 37.1 means smallest among h, 2.5t & 2.5ti.