Define the horizontal pipe run - CAESAR II - Reference Data

CAESAR II Applications Guide (2019 Service Pack 1)

PPMProduct
CAESAR II
PPMCategory_custom
Reference Data
Version_CAESAR
11.0 (2019)

Node 30 Elbow and Hanger

Node 30 defines the 90-degree elbow and the hanger as the pipe run turns from vertical to horizontal. When you define the elbow, the software adds nodes at the elbow near point and far point.

  1. Double-click the Bend check box to display the Bends tab on the right.

    The software creates a long radius elbow (1-1/2 times the nominal pipe diameter), node 28 at the elbow near point (Angle 2 of 0.000), and node 29 at the midpoint (Angle 1 of M). Node 30 moves to the elbow far point.

    The elbow is part of the vertical pipe run, but does not display until you create the horizontal pipe run.

  2. Double-click the Hangers check box to display the Hangers tab on the right.

  3. Type 28 in the Node box to place the hanger at the elbow near point.

  4. Clear the Allow Short Range Springs box. Use the default value of 1 - ANVIL for Hanger Table.

  • You can change the Radius value on the Bends tab.

  • For the first iteration of the analysis, you will use the default hanger settings with no additional design data. Click in a hanger setting box on the Hangers tab and press F1 to open the help for more information.

  • A short-range spring is not used at this point because a mid-range spring is usually less expensive.

Node 35-40 Pipe Element

The next element starts the horizontal pipe run in the X direction from the far point of the vertical elbow (node 30) to the intersection of the horizontal pipe centerlines at the horizontal bend (node 35).

  1. Click Continue on the Navigation Tools toolbar.

    The To node 30 of the previous element now displays as the From node. The To node is 35.

  2. In the DX box, type -12 ft., and then press TAB.

    The elbow on the vertical pipe element and the new horizontal pipe element display.

Node 35 Elbow and Restraint

Node 35 defines the horizontal 90-degree elbow and the rigid restraint. When you define the elbow, the software adds nodes at the elbow near point and far point. The length is 12 ft.

The restraint is non-linear, meaning its stiffness is not constant but is a function of load or displacement. It does not allow the pipe to move downward, but allows the pipe to move upward.

  1. Double-click the Bend check box to display the Bends tab on the right.

    The software creates a long radius elbow (1-1/2 times the nominal pipe diameter), node 33 at the elbow near point (Angle 2 of 0.000), and node 34 at the midpoint (Angle 1 of M). Node 35 moves to the elbow far point.

    .

    Similar to the first elbow, the elbow is part of the horizontal pipe run, but does not display until you create the next pipe element.

  2. Double-click the Restraints box to display the Restraints tab on the right.

  3. Type +Y in the Type box to place the support at the elbow far point.

    With no stiffness specified with the restraint, CAESAR II sets the restraint as very stiff (rigid). This means that under any practical load, the pipe does not push the restraint downward. The restraint displays as a vector.

  • The software represents all restraints, except anchors, as vectors.

  • You can specify up to four restraints on the Restraints tab.

  • To restrain lateral motion at node 35, use an X value to define a second guide restraint.

Node 35-40 Pipe Element

The next element finished the horizontal pipe run in the Z direction from the far point of the horizontal elbow (node 35) to the termination at the intersection with the vessel wall (node 40). The length is 18 ft.

  1. Click Continue on the Navigation Tools toolbar.

    The To node 35 of the previous element now displays as the From node. The To node is 40.

  2. In the DZ box, type 18-, and then press TAB.

    The horizontal elbow and the new horizontal pipe element display.

  3. Double-click the Displacements check box to display the Displacement tab on the right.

    40 displays as the value for Node 1.

  4. Define displacements for the thermal growth of the pump discharge nozzle from the base support (anchor) point. For anchor displacement DY in the Vector 1 column, type 0.077. For anchor displacement DZ in the Vector 1 column, type 0.046.

  5. Define displacements for the thermal growth of the vessel nozzle. In the Vector 1 column, type the following values:

    DX

    0.0

    DY

    0.28

    DZ

    -0.1

    RX, RY, & RZ

    0.0

    The displacement vector displays in the graphic view.