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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
Answer: Hanger flanges are considered to be bolted to a structure.
Modeling approach:
A. On the segment where the flange is to be modeled, insert a node point (ex. B04) as the welded connection between he pipe and flange
B. Insert a Pipe run half the total length of the Hanger flange (ex. B05).
C. Insert another Pipe run with the same length as in Step B above (ex. B06).
D. Select the middle point of the flange (ex. B05), insert a flange component. On the flange dialog, change Joint End Type = "User Defined", set "Joint SIF" = 1.0 (note: can use any joint end type connection so long as the SIF calculated is 1.0 at the flange point)
E. Select both pipe runs (ex. B04-B05 & B05-B06), press Insert > Rigid options over Range (Include Weight = off, Include Thermal Expansion = off...pipe will be shown purple), and press OK button
F. Select both flange end points (ex. B04 & B06), Press Insert > Xtra Data> Joint Type user SIF. Select the correct type of end connection or enter a user SIF.
G. Connection to support: choose one of the following, model connection as simple supports or model with beam elements
Note: i. Model connection as simple support: Insert AutoPIPE supports as need at the flange center point (ex. B05).
ii. Model connection with beams: Insert rigid beam elements from the flange center (ex. B05) to the actual bolted support connection (ex Sq beam). Add additional beams with the correct beam properties from the bolted support connection to the support structure that is correctly supported (ex. Angle beams).
Answer: The swivel flange is used with medium service pressures at points where the bolt holes in the mounting flanges are not precisely aligned. The swivel flange simplifies fitting between 2 fixed points.
Answer: For strss analysis purpose, the program needs to know the weight and SIF associated with a flange. Most ASME piping codes do not have established SIF values for these types of flanges. Whilst ASME 16.5 and 16.47 codes are applicable for weld neck flanges, they are not applicable to swivel ring flanges beyond the bolt pattern and bolt sizes. ASME offer alternative rules that consider swivel ring flanges as non-standard, or loose type, flanges.
Therefore the modeling appraoch for these types of flanges:
Select the node point where the flange is to be located, press Insert> Flange>, on the flange dialog screen enter:
Flange type = NS
Pressure Rating = NS
Weight = enter weight from vendor literature
Joint End Type: User Defined
Joint SIF: contact flange manufature for value to be used.
Note: One could argue to set Joint end type = "Lap joint" in order to automatically calcuale the SIF. However, since these types of joints are not covered by the applicable piping code, you will need to use engineering judgement or contact the manfacture. Bentley TSG cannot provide a definative value.
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