Monthly Archives: August 2015

Command of the week [Isometric Drawing Split-up]

How to Split up the Auto generated Isometric drawings.

Step 1

Go to I-Configure > Edit the required ISO project > Drawing Manager > Drawing Generation > Drawing Splitting > untick the Check box called “Automatic Drawing Splitting”.

Step 2

Go to I-Configure > Edit the required ISO project > Drawing Manager > Drawing Generation > Drawing Splitting > Specify number of drawings to split or to get as single sheet value is “1”

Step 3

Save the ISOGEN Configuration and Export the Style to extract the Isometric drawing in CADWorx.

Note:

Specifies the number if drawing sheets required for split control. This dictates how many drawing sheets are extracted for pipeline. Therefore, you should only use this option for special cases for single pipe as the setting applies to all the pipelines in a run. For automatic control of the drawing numbers, type 0, to specify a user-defined number of drawings type a value in range 1-99

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WRC 107 & 297 wizard in CAESAR II

Whenever Pressure Vessel or Heat exchanger (Static Equipments) nozzle loads exceeds the allowable values provided by Vendors (Equipment manufacturer) or standard project specific tables (guidelines), the piping stress professional is permitted to use WRC 107/297 (or any other FEA) to check the stresses at the Nozzle-Shell junction point and check the stresses with allowable values provided by Codes.

WRC-107, entitled “Local Stresses in Spherical and Cylindrical Shells due to External Loadings”, was released in 1965 and updated in 1979. WRC-297 was released in 1984 and goes under the title of “Local Stresses in Cylindrical Shells due to External Loadings – Supplement to WRC Bulletin No. 107”

Assumptions & limitations for using WRC 107:

To determine whether WRC 107 bulletin can be used for local stress checking the following geometry guidelines must be met:

  1. Nozzle Connection is assumed to be a rectangular loading surface (no nozzle, no hole) for circular and longitudinal moment loads. In short, not for nozzle stress calculations.
  2. WRC 107 has no provision for pressure loads. The adding of pressure to external loads has historically been problematic for WRC 107 calculations.
  3. Shell reinforcements are not considered.
  4. WRC 107 does not provide flexibilities of the intersections
  5. d/D<0.33
  6. Dm/T=(D-T)/T>50 (Here, T=Vessel Thickness, Dm=mean diameter of vessel)
  7. Not intended for small D/T ratios.

Assumptions & limitations for using WRC 107:

To determine whether WRC 107 bulletin can be used for local stress checking the following geometry guidelines must be met:

  1. Includes effect of nozzle, nozzle opening and nozzle thickness.
  2. Does not include pressure effects. (See WRC 468)
  3. Includes stiffness calculations in Fig 59&60 that can easily be used to produce numbers that are off by several orders of magnitude (high and low) since extrapolation on log-log plot is required for geometric parameters.
  4. Shell reinforcements are not considered.
  5. d/D<=0.5
  6. d/t>=20   and d/t<=100   (Here t=nozzle thickness)
  7. D/T>=20   and D/T<=2500
  8. d/T>=5
  9. Nozzle must be isolated (it may not be close to a discontinuity) – not within 2√(DT) on vessel and not within 2√(dt) on nozzle

Parameters required for performing WRC checking:

The following documents must be ready with you before you start to perform WRC 107/297 checking:

  1. Equipment Details/ General Arrangement Drawing
  2. Nozzle details
  3. Line list

Procedure for WRC analysis:

  1. Static analysis of the piping system must be performed and nozzle loads are calculated for local stress calculations.
  2. Look for WRC icon under your analysis tab. Click here and enter a job name in the space provided.

1

  1. Select which one you would like to perform.

2

  1. Give the required input for Nozzle.

3

  1. Give the required input for Vessel

4

  1. Input vessel and Nozzle direction cosines, Internal design pressure and load and moments values from Caesar static analysis output (Sustained, Expansion and occasional as applicable). Define path of C2 file.

5

  1. It is recommended to not to change any parameter under “Options” tab. Now click on analysis to read the results. Check the result for WRC analysis wether it is failed or passed.

6

Note:- For WRC 297, If below highlighted field sets to True. The program will compute local stresses in accordance with British Standard 5500 Annex G instead of Welding Research Council Bulletin 297.

7

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CADWorx Plant Command of the week [Total Center of Gravity]

Total Center of Gravity Generator

CADWorx Plant I tab: Pipe BOM / DB > C.G. Generator

Plant menu: Accessory > C.G. Generator

Command line: TCG

Calculates center of gravity for all components drawn in X, Y planes (2D plans) or in X, Y, Z planes (3D Model). You can use a generic attach (from Plant > Toolbars > Misc) which provides the center of gravity location and weight. For more information on specifying a center of gravity location for a generic attach, see Generic Attach or Steel – Generic Attachment.

Selection can be done by crossing, window, or selecting individual component.

Total Center of Gravity Calculation Dialog Box

Calculates the total center of gravity for all components.

Selected Components

Select – Enables you to select items to calculate the total center of gravity for that item.

Piping – Enables piping to be calculated for the total center of gravity. Reports the selected component counters in the corresponding box.

Piping Insulation – Enables piping insulation to be calculated for the total center of gravity. Reports the selected component counters in the corresponding box.

Steel – Enables steel to be calculated for the total center of gravity. Reports the selected component counters in the corresponding box.

HVAC – Enables HVAC to be calculated for the total center of gravity. Reports the selected component counters in the corresponding box.

Equipment – Enables equipment to be calculated for the total center of gravity. Reports the selected component counters in the corresponding box.

You must have a material set for the equipment, and then run EQUIPCG before you can get a center of gravity calculation for equipment in CADWorx Plant.

Report Options

Title – Specifies a title for the report that prints when CG is calculated.

Path – Specifies the location of the report file. Click the Path ellipsis to change the location and save the file.

Print report to command line – Prints the total center of gravity report to the command line.

View Report – Indicates that the software opens the report after the center of gravity calculates.

Insert drawing marker – Inserts a drawing marker for the total center of gravity.

  • Click C.G. Generator on the Pipe BOM / DB panel in the CADWorx Plant I tab. alternatively, type TCG on the command line and then press ENTER.
    • The Total CG Calculation dialog box displays.
  • Select the type of components to calculate center of gravity.
  • Enter a title for the report in the Title box.
  • Select whether you want the report to print on the command line, view the report, or whether you want to insert a marker.
  • Click Select.
    • Before you can get a center of gravity calculation for equipment in CADWorx Plant, you must have a material set for the equipment, and then you must run EQUIPCG.
    • When selecting equipment to calculate the center of gravity, you have the following choices:
      • Select all.
  • Zoom to the small white cross and select it.
  • Select the components, and then press ENTER.
    • The center of gravity calculates and the Total CG Calculation dialog box redisplays with the selected component counters in the corresponding boxes.
  • Click OK.

A center of gravity reference point and a report display.

Sample report

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