Define the vertical pipe run - CAESAR II - Reference Data

CAESAR II Applications Guide
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CAESAR II
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Reference Data
CAESAR II Version
12

Node 10 Welding Tee Intersection

Node 10 defines the bottom intersection of the 8-inch main and 6-inch bypass lines. This intersection is constructed using an 8 x 6 welding tee. Piping codes recognize the reduced strength of this piping component by increasing the calculated stress at this point in the system. For CAESAR II to include this stress intensification factor in the stress calculation, the node must be identified as a welding tee.

  1. Double-click the SIFs & Tees check box to display the SIFs/Tees tab on the right.

  2. In the Node box, specify 10 as the intersection node.

  3. In the Type list, select 3 - Welding.

    CAESAR II calculates the SIFs at this intersection according to the selected B31.3 piping code.

Node 10-15 Pipe Element for Welding Tee

This element runs from the intersection point (node 10) to the beginning of the check valve (node 15). This short run finishes out the welding tee. The length of the element is 7 inches in the Y direction.

  1. Click Continue on the Navigation Tools toolbar to define the next length of pipe.

    You can also press ALT-C or click Edit > Continue.

    The To node 10 of the previous element now displays as the From node. The To node is 15. All pipe material properties carry forward from the previous element. Allowable stress data also carries forward, even though the Allowable Stress box is cleared.

  2. In the DY box, type 7 to specify the element length of 7 in. Press TAB.

  • Do not select Allowable Stress unless you have a change in material, code, or temperature.

  • Uniform Loads and Wind also carry forward without selecting the check box. No other component information, boundary conditions, or loading conditions carry forward.

Node 15-20 Check Valve

The next element is the flanged check valve and the mating flanges. The software considers a valve to be a rigid element and includes the mating flanges because flange piping components are stiffer than the attached pipe. The software accesses the valve/flange database to automatically generate the valve and its data.

  1. Click Continue on the Navigation Tools toolbar.

    The To node 15 of the previous element now displays as the From node. The To node is 20.

  2. Click Model > Valve, or click Valve/Flange Database on the Input Tools toolbar.

    The Valve and Flange Database dialog box displays.

  3. Select CHECK from the Rigid Type list and FLG from the End Type list. Click OK.

    A 150 psi class flanged check valve displays between nodes 15 and 20.

    The software adds valve data to the Classic Piping Input dialog box. The element length DY is 2 ft. 3.75 in., Rigid is selected, and the weight of the valve and flanges of 470.000 displays in the Rigids tab.

  • If you know the length and weight of the valve, you can directly specify the DY length and the Rigid Weight in the Rigids tab.

  • If the Valve and Flange Database dialog box does not display, see Configuration Editor in the CAESAR II User's Guide.

Node 20-25 Pipe Element for Welding Tee

This element runs from the end of the check valve (node 20) to the top intersection point (node 25) This short run finishes out the top welding tee. The length of this element is 7 inches in the Y direction (half of the total length of the 8-inch x 6-inch welding tee).

  1. Click Continue on the Navigation Tools toolbar.

    The To node 20 of the previous element now displays as the From node. The To node is 25.

  2. In the DY box, type 7 to specify the element length of 7 in.

Node 25 Welding Tee Intersection

Node 25 defines the top intersection of the 8-inch main and 6-inch bypass lines. This intersection is constructed using a second 8-inch x 6-inch welding tee that sits on top of the check valve.

  1. Double-click the SIFs & Tees check box to display the SIFs/Tees tab on the right.

  2. In the Node box, specify 25 as the intersection node.

  3. In the Type list, select 3 - Welding.

    CAESAR II calculates the SIFs at this intersection according to the selected B31.3 piping code.

Node 25-30 Pipe Element

The next element runs from the top intersection of the 8-inch main and 6-inch bypass lines (node 25) to the intersection of the vertical pipe centerline and the horizontal pipe centerline (node 30). The length of this element is 10 ft. 2 in. in the Y direction.

Node 30 does not remain at this location on the piping system. Any additional input specified at 30 and all output for node 30 is located at the far weld point of the elbow, which connects the vertical and horizontal runs.

  1. Click Continue on the Navigation Tools toolbar.

    The To node 25 of the previous element now displays as the From node. The To node is 30.

  2. In the DY box, type 10- 2 to specify the element length of 10 ft. 2 in. Press TAB.