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Attention: Please see the following AutoPIPE help section: Help > Contents> Contents Tab> Modeling Approaches> Modeling Approaches>This help has been provided in order to give users ideas for modeling typical piping arrangements. The steps shown in each example should not be taken as the only method available to create models. In addition, the intent of the examples is to present ways to create adequate models of specific piping components for analytical purposes. Anchors Bends Cuts Flexible Joints Frames Hangers Nozzles Pipes Reducers Rotating Equipment Supports Tees Valves Vessels
Modeling a Nozzle per WRC 297?
Answer: The following fields of data are available when WRC 297 is selected as a Flexibility Method on a nozzle dialog screen:Enter in values for L1, L2, and Direction of vessel axis to calculate the nozzle flexibility.Copied from the On-line help:L1 = distance from the center of the nozzle to either vessel end or to the face of the nearest internal stiffening attachment (e.g., ring).L2 = Enter the distance to the other end of the vessel (or nearest internal stiffening attachment in that direction).Meaning, measuring from the center of the nozzle in one direction along the axis of the vessel to a point where the vessel end or vessel internal stiffener ring, enter the value as L1. Repeat the same measurment in the opposite direction along the vessel to a point where the vessel ends or vessel internal stiffener ring, enter the value as L2 (note, L1 and L2 are interchangeable values with regards to the nozzle flexibility calculation, see online help "Nozzle Flexibility Calculations" for complete details).
Note: When looking at the Nozzle Stiffness values on the dialog screen be sure to remember that they are multiplied by E06. Example: See dialog screen, Nozzle stiffness (E6): Rad = 3.1223 lb /in, but in the output report it is printed as Krad=3122285.75 lb/in. Both values are correct but are displayed differently regardless of floating units (lb/in) on the dialog screen
Questions: Can you provide more details on the Nozzle dialog fields, Length and Thcikness?
Answer: From AutoPIPE online help:
Length:
Enter the length of the vessel shell wall. Nozzle length is not used in calculated the nozzle flexibility (which is really the vessel shell flexibility). The length defines a flexible joint to which the nozzle flexibilities (as calculated by AutoPIPE) are assigned.
Vessel Radius/ Thickness:
Enter the outside radius (or half the actual diameter) of the vessel and the thickness of the vessel wall in these two fields.
Additional Notes:
1. Length value = Vessel Shell Wall, which in many cases is the same as the Thickness value. However, be carefull when entering these values, always look to see what units are being used. In English units, Length is entered in FT (mm), where Thickness is entered in INCH (mm).
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