45 degree large bore elbow lug modeling

You could try moving the midpoint to align with the workpoint.  Looks like it needs to be about 55%.

You cannot attach to the tangent point, not an option in the current version and probably not a viable option for 90% of elbows. You could make a small beam, with rigid properties, attach to the midpoint and then reach out to the tangent point then attach a rod to that beam.

Thanks Samhuff,

I did what you said,

the support load had been increased 24% compared modeling support at middle point,

Thanks

Limin

Hello Limin,

SAMHUFF comment below was correct that you change the location of the mid point and then insert a short beam section. This is very similar to base supported elbow modeling, please see the following AutoPIPE help section:

• Help > Contents> Contents Tab> Modeling Approaches> Modeling Approaches> Bend> Base Supported Elbow> Model 5: Modeling a "dummy leg" as a pipe

You could model the lug as a steel frame instead of a pipe as in this modeling approach. Although, AutoPIPE would provide a stress at the trunnion connection, suggest performing a true FEA analysis for accurate results of the trunnion/lug connection to the pipe.

Note: AutoPIPE nozzle has a new feature to provide analysis based on the following nozzles: hollow-pipe, solid-round, solid-rectangular, hollow-rectangular, or attachment nozzle type. The solid types are used for lugs or trunnions on pipes or vessels. In addition there is an “attachment” that can be selected in the Nozzle Type drop-down list which allows the user to select from 8 of the most popular configurations

In order to use AutoPIPE Nozzle:

a. When modeling the supports in step 4 above, model as an Anchor (on the dialog, check “Report anchor results to AutoPIPE Nozzle”).

b. Run AutoPIPE analysis.

c. Select File> Export “Nozzle Loads to AutoPIPE Nozzle” (AutoPIPE Nozzle is a separate Bentley application and requires a separate license).

d. Import the loads into AutoPIPE Nozzle, update the tabs as required, and perform AutoPIPE nozzle analysis on the lug/trunnion connection.

More information on this topic can be found with Bentley's Knowledge Search utility:

____1. Go to the Bentley web site (www.bentley.com)

____2. Select  "Support and Services" from the top

             ribbon

____3. Select "Support" hyper link

____4. In the multi colored blue/green grid, under

             Support Tools heading, select

             "KnowledgeBase" hyperlink

____5. Log into the Bentley website. (call Bentley if

             you have troubles logging into the website)

____6. Enter the following into the "Search Text" field

             "54367" and press "Search" button.

____7. The first 100 hits will be displayed.

____8. Review the results and select the hyperlink

             labeled "AutoPIPE modeling: Trunion / Lug".

Note:

a. Use the "Advanced search" hyper link can yield more specific results (exact phrase, limited to a product name, etc..)

b. See training video on using Knowledge Search at:

Regards,

Mike Dattilio

Bentley Technical Support Analyst

Hello Limin,

SAMHUFF comment below was correct that you change the location of the mid point and then insert a short beam section. This is very similar to base supported elbow modeling, please see the following AutoPIPE help section:

• Help > Contents> Contents Tab> Modeling Approaches> Modeling Approaches> Bend> Base Supported Elbow> Model 5: Modeling a "dummy leg" as a pipe

You could model the lug as a steel frame instead of a pipe as in this modeling approach. Although, AutoPIPE would provide a stress at the trunnion connection, suggest performing a true FEA analysis for accurate results of the trunnion/lug connection to the pipe.

Note: AutoPIPE nozzle has a new feature to provide analysis based on the following nozzles: hollow-pipe, solid-round, solid-rectangular, hollow-rectangular, or attachment nozzle type. The solid types are used for lugs or trunnions on pipes or vessels. In addition there is an “attachment” that can be selected in the Nozzle Type drop-down list which allows the user to select from 8 of the most popular configurations

In order to use AutoPIPE Nozzle:

a. When modeling the supports in step 4 above, model as an Anchor (on the dialog, check “Report anchor results to AutoPIPE Nozzle”).

b. Run AutoPIPE analysis.

c. Select File> Export “Nozzle Loads to AutoPIPE Nozzle” (AutoPIPE Nozzle is a separate Bentley application and requires a separate license).

d. Import the loads into AutoPIPE Nozzle, update the tabs as required, and perform AutoPIPE nozzle analysis on the lug/trunnion connection.

More information on this topic can be found with Bentley's Knowledge Search utility:

____1. Go to the Bentley web site (www.bentley.com)

____2. Select  "Support and Services" from the top

             ribbon

____3. Select "Support" hyper link

____4. In the multi colored blue/green grid, under

             Support Tools heading, select

             "KnowledgeBase" hyperlink

____5. Log into the Bentley website. (call Bentley if

             you have troubles logging into the website)

____6. Enter the following into the "Search Text" field

             "54367" and press "Search" button.

____7. The first 100 hits will be displayed.

____8. Review the results and select the hyperlink

             labeled "AutoPIPE modeling: Trunion / Lug".

Note:

a. Use the "Advanced search" hyper link can yield more specific results (exact phrase, limited to a product name, etc..)

b. See training video on using Knowledge Search at:

Regards,

Mike Dattilio

Bentley Technical Support Analyst