Intersection SIF Scratchpad - CAESAR II - Help

CAESAR II Users Guide

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CAESAR II Version
12

Piping Input menu: Environment > Review SIFs at Intersection Nodes

Input Tools toolbar: Intersection SIF Scratchpad

Displays the Node Selection dialog box, and then the Review Intersection SIF's dialog box. You can calculate stress intensification factors (SIFs) for intersection configurations under different codes.

Node Selection Dialog Box

Controls options for selecting the node.

Enter intersection Node Number to be reviewed

Specifies the node number where you want to evaluate the stress intensification factors.

OK

Displays the Review Intersection SIF's dialog box.

Review Intersection SIFs Dialog Box

Controls options for reviewing intersection SIFs.

The boxes that display in this dialog box depend upon the piping code you select for the job.

Node

Specifies the node number where the stress intensification exists. CAESAR II displays the To node of the current element by default. You can type any node in the system, but it is most often at a pipe intersection or joint.

If the node is at an intersection, CAESAR II calculates SIFs for all pipes going to the intersection if the intersection Type is specified. You only need to type the intersection type once. CAESAR II finds all other pipes framing into the intersection and applies the appropriate SIFs.

If the node is at a two-pipe joint, such as a butt weld, CAESAR II calculates SIFs for the two pipes going to the joint node if the joint Type is specified. You only need to specify the joint type once. CAESAR II finds the other pipe completing the joint and applies the appropriate SIFs.

If the node is not at an intersection or a joint then, leave the Type box blank and type user defined SIFs in the SIF(i) and SIF(o) boxes. Entries in the SIF(i) and SIF(o) boxes only apply to the element on which they are defined.

User defined stress intensification factors must be greater than or equal to one.

CAESAR II calculates and displays code-defined SIFs in the Intersection SIF scratchpad. Access this scratchpad from the Classic Piping Input dialog box by clicking Environment > Review SIFs at Intersection Nodes or Intersection SIF scratchpad on the Input Tools toolbar. You can modify parameters used in the scratchpad so that you can observe the effects of different geometries and thicknesses. Most changes made in the scratchpad can be automatically transferred back into the model.

If the node is on any part of the bend curvature, then the following applies:

  • You cannot override code calculated SIFs for bends by default. A configuration option exists to override this default. For more information, see Allow User's SIF at Bend. If you set Allow User's SIF at Bend to True, then you can specify SIFs for bend To nodes. The SIFs specified in this way apply for the entire bend curvature.

CAESAR II applies user-defined SIFs to straight pipe going to points on a bend curvature regardless of any parameter in the setup file. This option is commonly used to intensify injector tie-ins at bends, or dummy legs, or other bend attachment-type of supports.

Type

Specifies the type of tee or joint.

Non-FRP piping codes

Select one of six types of tees and ten types of joints. These elements correspond to 1 to 6 and 7 to 16 in the table Input Items Optionally Affecting SIF Calculations (Except for ISO 14692)*.

BS 7159 and UKOOA

Select Moulded or Fabricated. A moulded tee corresponds to either the Welding (3) or Extruded (6) welding tee Type. A fabricated tee corresponds to a tee Type of Reinforced (1).

IGE/TD/12

Select one of 11 types of tees and joints. For specialized diagrams of tee type with this code, see IGE\TD\12 Reference.

ISO 14692 2005

Select one of three types of tee and joints: Tee (1), Qualified Tee (3), and Joint (2). Select 1 - Tee for the software to use the method specified in the ISO 14692 code for non-qualified tees. Select 2 - Joint for CAESAR II to use the calculations specified in the code for joints and fittings. Select 3 - Qualified Tee for the software to use the code-specified calculation for qualified service stress for tees (including the pressure stress multiplier, mpst).

ISO 14692 2017

Select 1 - Tee for a SIF of 1.5 or 2 - Other for a SIF of 1.0.

ASME NC and ND piping codes

These codes do not include equations for SIFs with a tee Type of Sweepolet (4), Weldolet (5), or Extruded (6). When you specify one of these tee types, CAESAR II uses B31.1 equations.

You must define a tee as the appropriate tee in Type for the proper application of in-plane and out-of-plane SIFs along the tee's local axis. Otherwise, the software assumes the tee is a pipe and apples SIFs along the pipe's local axis.

Pad Thk

Specifies the thickness of the reinforcing pad for reinforced fabricated or full encirclement tees (intersection type #1 and #17, respectively). The pad thickness is only valid for these intersection types. If the thickness of a type #1 or type #17 intersection is left blank or the value entered is zero, the software uses the SIFs for an unreinforced fabricated tee.

In most piping codes, the beneficial effect of the pad thickness is limited to 1.5 times the nominal thickness of the header. This factor does not apply in BS 806 or Z184 and is 2.5 in the Swedish piping code.

Ftg Ro

Specifies the fitting outside radius for branch connections. This option is used for reduced branch connections in the ASME and B31.1 piping codes, Bonney Forge Insert Weldolets, and for WRC 329 intersection SIF calculations. Configuration options exist to invoke the WRC 329 calculations and to limit the application of the reduced branch connection rules to unreinforced fabricated tees, sweepolets, weldolets, and extruded welding tees. If omitted, Ftg Ro defaults to the outside radius of the branch pipe.

Te/Tb

Specifies Te or Tb based on component type.

Typical units (depending on your unit system):

  • in

  • mm

  • cm

Fabricated Tee with Pad

Specifies the Te value. For more information on Te, see IGE\TD\12 Reference.

Forged Tee to BS 1640

Specifies the Tb value. For more information on Tb, see IGE\TD\12 Reference.

Weldolet

Specifies the Tb value. For more information on Tb, see IGE\TD\12 Reference.

Drawn/Extruded Tee

Specifies the Tb value. For more information on Tb, see IGE\TD\12 Reference.

Full Encirclement Tee

Specifies the Te value. For more information on Te, see IGE\TD\12 Reference.

Long Weldneck Flange

Specifies the Tb value. For more information on Tb, see IGE\TD\12 Reference.

Weldoflange

Specifies the Tb value. For more information on Tb, see IGE\TD\12 Reference.

Crotch R

Specifies the crotch radius of the formed lip on an extruded welding tee, intersection type 6. This is also the intersection weld crotch radius for WRC329 calculations. Specifying this value can result in a 50% reduction in the stress intensification at the WRC 329 intersection. If you attempt to reduce the stress riser at a fabricated intersection by guaranteeing that there is a smooth transition radius from the header to the branch pipe, then you may reduce the resulting stress intensification by a factor of 2.0.

Weld ID

Specifies the weld identifier value. Choose from the following options:

  • 0 or BLANK - As Welded

  • 1 - Finished/Ground Flush

This box is only applicable for:

  • IGE/TD/12

  • Bonney Forge Sweepolets

  • Bonney Forge Insert Weldolets

  • Butt Welds in the Swedish Piping Codes or the IGE/TD/12 code

If you specify a value of 1 - Finished/Ground Flush, then the software considers the weld to be ground flush on the inside and out and it calculates the SIF as 1.0.

For more information on how input parameters are used to compute SIFs for girth butt welds, see WELD (D).

Weld(d)

Specifies the average circumferential weld mismatch measured at the inside diameter of the pipe. This value is used for butt welds and tapered transitions. This is the average; not the maximum mismatch. You must verify that any maximum mismatch requirements are satisfied for your code.

Fillet

Specifies the fillet leg length. This option is used only in conjunction with a socket weld component. This value is the length of the shorter leg for an unequal leg fillet weld. If a fillet leg is given, both socket weld types result in the same SIF. See appendix D of the B31 piping codes for further clarification.

Header OD

Specifies the actual outside diameter of the header matching pipe.

Header Thk

Specifies the actual wall thickness of the header matching pipe.

Branch OD

Specifies the actual outside diameter of the matching pipe.

Branch Thk

Specifies the actual wall thickness of the matching pipe.

Header SIF(i)

Displays the SIF in-plane for the header.

Header SIF(o)

Displays the SIF out-of-plane for the header.

Branch SIF(i)

Displays the SIF in-plane for the branch.

Branch SIF(o)

Displays the SIF out-of-plane for the branch.

Flexibility Characteristic

Displays the flexibility characteristic. For more information on how wall thickness is used in the flexibility characteristic (h) equation, see Wall Thickness of Bend.

Branch Section Modulus

Displays the branch section modulus.

Recalculate

Displays the SIFs after you enter a different set of data. If you change the input data, CAESAR II allows you to transfer the data back to a CAESAR II model.

Other Code-Specific Inputs

The following inputs appear only when you select certain piping codes.

Do/r3

Specifies the Do or r3 values for each component type

Typical units (depending on your unit system):

  • in

  • mm

  • cm

Forged Tee to BS 1640

Specifies the Do value. For more information on Do, see IGE\TD\12 Reference.

Weldolet

Specifies the r3 value. For more information on r3, see IGE\TD\12 Reference.

Drawn/Extruded Tee

Specifies the Do value. For more information on Do, see IGE\TD\12 Reference.

Weldoflange

Specifies the r3 value. For more information on r3, see IGE\TD\12 Reference.

T/Th/Tb

Specifies the following terms for each component type:

Forged Tee to BS 1640

Typical units (depending on your unit system):

  • in

  • mm

  • cm

Specifies the T value. For more information on T, see IGE\TD\12 Reference.

Weldolet

Specifies the theta (q) value in degrees. For more information on theta, see IGE\TD\12 Reference.

Drawn/Extruded Tee

Typical units (depending on your unit system):

  • in

  • mm

  • cm

Specifies the T value. For more information on T, see IGE\TD\12 Reference.

Weldoflange

Specifies the theta (q) value in degrees. For more information on theta, see IGE\TD\12 Reference.

Te/Tb

Specifies Te or Tb based on component type.

Typical units (depending on your unit system):

  • in

  • mm

  • cm

Fabricated Tee with Pad

Specifies the Te value. For more information on Te, see IGE\TD\12 Reference.

Forged Tee to BS 1640

Specifies the Tb value. For more information on Tb, see IGE\TD\12 Reference.

Weldolet

Specifies the Tb value. For more information on Tb, see IGE\TD\12 Reference.

Drawn/Extruded Tee

Specifies the Tb value. For more information on Tb, see IGE\TD\12 Reference.

Full Encirclement Tee

Specifies the Te value. For more information on Te, see IGE\TD\12 Reference.

Long Weldneck Flange

Specifies the Tb value. For more information on Tb, see IGE\TD\12 Reference.

Weldoflange

Specifies the Tb value. For more information on Tb, see IGE\TD\12 Reference.

rp/do

Specifies rp or do based on the component type.

Typical units (depending on your unit system):

  • in

  • mm

  • cm

Fabricated Tee

Specifies the rp value. For more information on rp, see IGE\TD\12 Reference.

Forged Tee to BS 1640

Specifies the do value. For more information on do, see IGE\TD\12 Reference.

Weldolet

Specifies the rp value. For more information on rp, see IGE\TD\12 Reference.

Drawn/Extruded Tee

Specifies the do value. For more information on do, see IGE\TD\12 Reference.

Long Weldneck Flange

Specifies the rp value. For more information on rp, see IGE\TD\12 Reference.

Weldoflange

Specifies the rp value. For more information on rp, see IGE\TD\12 Reference.

r2/rc

Specifies r2 or rc values based on the component type.

Typical units (depending on your unit system):

  • in

  • mm

  • cm

Fabricated Tee

Specifies the r2 value. For more information on r2, see IGE\TD\12 Reference.

Forged Tee to BS 1640

Specifies the rc value. For more information on rc, see IGE\TD\12 Reference.

Sweepolet

Specifies the rc value. For more information on rc, see IGE\TD\12 Reference.

Weldolet

Specifies the r2 value. For more information on r2, see IGE\TD\12 Reference.

Drawn/Extruded Tee

Specifies the rc value. For more information on rc, see IGE\TD\12 Reference.

Long Weldneck Flange

Specifies the r2 value. For more information on r2, see IGE\TD\12 Reference.

Weldoflange

Specifies the r2 value. For more information on r2, see IGE\TD\12 Reference.

r1/Tc/Lh

Specifies r1, Tc, or Lh based on the component type.

Typical units (depending on your unit system):

  • in

  • mm

  • cm

Fabricated Tee

Specifies the r1 value. For more information on r1, see IGE\TD\12 Reference.

Forged Tee to BS 1640

Specifies the Tc value. For more information on Tc, see IGE\TD\12 Reference.

Sweepolet

Specifies the r1 value. For more information on r1, see IGE\TD\12 Reference.

Weldolet

Specifies the r1 value. For more information on r1, see IGE\TD\12 Reference.

Drawn/Extruded Tee

Specifies the Lh value. For more information on Lh, see IGE\TD\12 Reference.

Long Weldneck Flange

Specifies the r1 value. For more information on r1, see IGE\TD\12 Reference.

Weldoflange

Specifies the r1 value. For more information on r1, see IGE\TD\12 Reference.

L1/Lb

Specifies L1 or Lb based on the component type.

Typical units (depending on your unit system):

  • in

  • mm

  • cm

Fabricated Tee

Specifies the L1 value. For more information on L1, see IGE\TD\12 Reference.

Weldolet

Specifies the L1 value. For more information on L1, see IGE\TD\12 Reference.

Drawn/Extruded Tee

Specifies the Lb value. For more information on Lb, see IGE\TD\12 Reference.

Long Weldneck Flange

Specifies the L1 value. For more information on L1, see IGE\TD\12 Reference.

Weldoflange

Specifies the L1 value. For more information on L1, see IGE\TD\12 Reference.

Ferric Material for Note 3673.2b-1.3

Indicates that the material for this tee is ferrous, which enables the Y value to be computed on the highest temperature value specified. This option is available for when you select ASME NC and ASME ND in the Piping Code ID list.