| Applies To | |
| Product(s): | AutoPIPE |
| Version(s): | ALL; |
| Area: | Modeling |
| Date Logged & Current Version |
Sept 2022 12.08.01.010 |
Problem:
How to model a piping component (ex. strainer) supported by steel members embedded in concrete?
Solution:
There are a number of ways to model this scenario. The WIKI page will focus on 2 approaches: 1. Detailed and 2. Simplified
Detailed Modeling approach
This approach will be based on the techniques used to model a pipe connected to a vessel (see AutoPIPE help: Help > Contents> Contents Tab> Modeling Approaches> Modeling Approaches> Vessel, recommend that you take the time and actually perform this exercise). The difference is that instead of mounting a pipe to a vessel, model steel mounted to a vessel.
Note: one can model a piping component as complete detail but remember that we are performing a pipe stress analysis using an application who's fundamental core assumption is using simple Beam element center-line based theory. Therefore, weight and properties are the major importance here. Having a photo realistic looking model is not important.
1. First model the piping component - see WIKI here for suggestion
2. Zoom Into the rigid pipe that represents the Piping component.
3. In this case, model the steel connected to the piping component. But first, add location for steel to be connected on piping component.
a. Convert point (ex. B06) to Tee
b. Insert pipe vertically down as needed.
c. Insert Rigid properties over range, Do not "Include weight", but include "Include Thermal Expansion"
Note the weight is already accounted for in the modeling approach of the piping component WIKI mentioned above, concentrated weight.
d. Insert Rigid Beam or Rigid Pipe member from the end of the vertical pipe to all 3 locations on the outside surface of the vessel.
Note:
i. For aesthetic only, suggest that the new beam or pipe property using a smaller section, ex. 2" pipe round
ii. Insert all 3 beams / pipes in one direction, then select and rotate beam / pipe to correct orientation
iii. If using a Rigid Pipe, enable Include thermal Expansion, and disable Include weight.
4. Insert new Beam section property for Steel supporting piping components, (ex. 2" angle), make sure to select the correct Material name or enter in the correct material properties.
5. Insert beam supports at each of the 3 surface locations, length = to the concrete floor. Adjust beam settings as needed to rotate orientation of vertical angle with respect to the piping component.
6. Since Steel is embedded into the concrete, assume that it is rigidly connected to the floor, insert rigid anchors at the end of vertical steel support
7. Insert pipe length to represent the cap at the bottom of the component.
8. Insert new pipe properties to represent pipe out the bottom of the component
9. Model new piping as needed from bottom of component.
10. Done!!!
Simplified Modeling approach
Instead of modeling the individual supports connecting the component to the floor, assume a flexible anchor and enter stiffness values as needed.