Monthly Archives: June 2015

How to restore corrupted CAESAR II file?

Those who are extensively using Caesar II software must have noted that sometimes few Caesar II files got corrupted due to some reason. And modeling the same file from isometric again is time consuming. At the same time the man hour used is lost without any fruitful result. The same happened to me yesterday. Unconsciously I deleted the required file and i was a bit worried as i had to redo the modeling again.

In such situation you can easily restore the complete Caesar model without much pain. This write up will try to explain the method of restoring the Caesar II file which is corrupted or deleted by mistake. However this will only work if you have performed the run function at least once. The load cases what you made will be lost and you have to make new load cases for the analysis. And i feel that’s better as making load cases does not take much time.

Whenever you prepare any Caesar file and then run the file for analysis a backup file of the stress system is automatically generated in the PC. Later that back up file can be used to restore the required Caesar file again.The steps are as follows:

  1. Click the open button on Caesar II and you will get the following screen.

             1

  1. Now click on the System button on the right side as shown in the above picture.
  2. After that page up button on top and you will get the following screen.
  3. Now Click on the back up file as shown in the above figure and choose your file. You must remember the file name to restore the same. Choose the latest file as per date and time to get the most updated information.

             2

  1. The Caesar file will be restored for you. Now save that file to the location where you want that to be and make the load cases as per your requirement for analysis. Hope this helps you to resolve few of your problems and save man hour.

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CADWorx Plant Command of the week [Change elevation/Join pipe/Break pipes]

Change Elevation

CADWorx Plant I tab: Misc > Change Elevation


Command line: CHANGEELEVATION

Changes the elevation of a selected pipe in the drawing.

Pick – Enables you to select the location for the change in the elevation.

  • BOP – Changes the elevation location to the bottom of pipe after specifying the elevation change.
  • TOP – Changes the elevation location to the top of pipe after specifying the elevation change.
  • Current – Keeps the center of the pipe as the current location after specifying the elevation change.

BOP – Enables you to change the elevation to the bottom of pipe.

TOP – Enables you to change the elevation to the top of pipe.

Join Pipe

CADWorx Plant I tab: Misc > Join Pipe


Command line: JOINPIPE

Changes segmented piping to non-segmented piping.

Run – Joins the entire run of pipe.

Segment – Joins the selected segments of pipe.

Break Pipe

CADWorx Plant I tab: Misc > Break Pipe


Command line: BREAKPIPE

Changes non-segmented piping to segmented piping.

Length – Specifies breaking the segments by length of the segments.

Number – Specifies breaking the segments by the number of segments.

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ImageGrafix’s Wednesday Webinars – Efficient Component Placement in CADWorx Plant Pro 2015

We hope you enjoyed our webinar. For your reference we have attached the link for the recording. Please feel free send us your feedback: support@igfzco.com

Watch Recording

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ImageGrafix’s Wednesday Webinars – June 2015 – Agenda

June 2015

Efficient Component Placement in CADWorx Plant Professional



Hanger Sizing in CAESAR II



FEA Analysis in GT Strudl

Date: June 10, 2015

Time:

09.00 AM(Qatar, Kuwait, Bahrain)
10.00 AM
(UAE, Oman)
11.30 AM
(India)


Duration: 30 Min

Cost: Free Webinar

Date: June 17, 2015

Time:

09.00 AM(Qatar, Kuwait, Bahrain)
10.00 AM (UAE, Oman)
11.30 AM (India)

Duration: 30 Min

Cost: Free Webinar

Date: June 24, 2015

Time:

09.00 AM(Qatar, Kuwait, Bahrain)
10.00 AM (UAE, Oman)
11.30 AM (India)

Duration: 30 Min

Cost: Free Webinar

Description:

Explaining the various In-line component placement options available in the latest CADWorx Plant Professional Software like

  • From the Library
  • Custom created Component

Description:

Spring hangers are an integrated part of Piping Industry. Selection of the appropriate type of hanger support for any given application is governed by the individual piping configuration and job requirements.

Join us during this webinar and discover how hanger wizard in Caesar II will help you in efficient selection of hangers.

Description:

For almost 40 years GT STRUDL has been one of the most widely accepted computer-aided engineering and design tools for structural analysis and design in the world. In this webinar, we will highlight the various FEA Capabilities of GT Strudl Software such as

  • Finite Element Plate Analysis
  • Lifting Lug for SKID

Speaker Bio:

Visakan is the Manager – Technical for Plant Design Solutions at ImageGrafix Engineering Services Pvt. Ltd. He is a Mechanical Engineer with 17 Years of experience in CAD Industry handling Intergraph & Autodesk Products. He is responsible for product presentation, training and lead the technical support teams in ImageGrafix India

Speaker Bio:

Rahul J Malaviyais the Product Manager for Plant Design Solutions at ImageGrafix Engineering Services Pvt. Ltd. He holds B.Tech degree in Mechanical Engineering from Noida Institute of Engg. & Tech and have 8 years of industry experience in project, demonstrations, training and end user support for CAESAR II, PVElite, TANK & PRG Software.

Speaker Bio:

Poornachandrikais the Product Manager for Structural Solutions at ImageGrafix Engineering Services Pvt. Ltd. She is a Civil and Structural Engineer with 18 + Years of experience in Structural Analysis and Design field with sound practical and technical knowledge.  She is responsible for providing technical presentations, technical support on GTSTRUDL and Dimensional Solution product.

Copyright © 2015 ImageGrafix Software FZCO. All rights reserved.

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Intergraph PV-Elite 2015 SP2 hasbeen released.

Dear Customer,

Intergraph PV-Elite 2015 SP2 has been released.

Here is the website to download the service pack,

https://smartsupport.intergraph.com/

In order to  download this service pack, you need the user name and password to login above Intergraph Smart Support . If you do not have user name and password, Kindly send the email to

Middle East – support@igfzco.com

India- Support@iges.in

Thanks,

ImageGrafix Support Team

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Propagating Caesar II properties

Here I would like to discuss about the essential properties automatically propagating over to subsequent elements in Caesar II.

What happens when you define properties like pipe diameter, schedule/Wall Thk, temperature, pressure etc. to an element? Did you notice that you need not to enter these properties again for following element? This is a helpful feature in Caeasar II that, when you define properties on an element, the software carries forward these properties to all subsequent model elements thereafter, until you explicitly change the property value.

But what if you want to change these properties? I believe you are not going to change this very often. Below figure is going to explain you which property is going to be retained when you go over a new element and which you might want to change based on your requirement.

In below spreadsheet image from Caesar II piping input properties shown below in orange are carrying forwarded to next element:

Pic 1

In the same image properties depicting in yellow are going to get changed based on pipe routing.

Check the Element List below, here it shows explicit data values in red and carry-forward properties in gray. This notation makes verification and editing quick and easy.

Pic 2

CAESAR II 2014 (Version 7.0) introduced a new feature where you can edit certain properties namely pressure temperature, schedule etc. over a block data, using the Legend dialog boxes. These dialog boxes helps you to review input properties graphically and added editing capabilities to the Legend dialog box values. You just need to double-click a value, Caesar II interface displays an Edit box in which you can specify a new value. This updates the edited value immediately in the piping input and on the model.

Check out the image below which depicts the new value edition in Legend dialog box:

Pic 3

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How AFT Impulse Can Help Engineers to Comply With ASME Codes

Engineers are often responsible to design systems to comply with codes and standards. In recent years codes that apply to waterhammer and surge pressures have become more prominent. Increasingly AFT Impulse is being used to help engineers comply with such codes. Once AFT Impulse has calculated the maximum pressure due to a transient event, what shall the designer do with this value? The answer to this question depends on the code that is being used as the piping design basis. In this article we’ll be discussing how two important piping design codes – B31.4 and B31.3 – deal with surge pressure (transient pressure) and how the results from AFT Impulse shall be used in order to comply with their requirements. Codes

  1. ASME Code for pressure piping B31.4. Pressure Transportation Systems for Liquid Hydrocarbons and Other Liquids.

401.2 Pressure 401.2.2 Internal Design Pressure. The piping component at any point in the piping system shall be designed for an internal design pressure which shall not be less than the maximum steady state operating pressure at that point, or less than the static head pressure at that point with the line in a static condition. The maximum steady state operating pressure shall be the sum of the static head pressure, pressure required to overcome friction losses, and any required back pressure. Credit may be given for hydrostatic external pressure, in the appropriate manner, in modifying the internal design pressure for use in calculations involving the pressure design of piping components (see para.404.1.3). Pressure rise above maximum steady state operating pressure due to surges and other variations from normal operations is allowed in accordance with para. 402.2.4.

402.2.4 Ratings – Allowance for Variations From Normal Operations. Surge pressures in a liquid pipeline are produced by a change in the velocity of the moving stream that results from shutting down of a pump station or pumping unit, closing of a valve, or blockage of the moving stream. Surge pressure attenuates (decreases in intensity) as it moves away from its point of origin. Surge calculations shall be made, and adequate controls and protective equipment shall be provided, so that the level of pressure rise due to surges and other variations from normal operations shall not exceed the internal design pressure at any point in the piping system and equipment by more than 10%. From B31.4 extracted paragraphs the following conclusions can be drawn:

  1. B31.4 refers directly to the maximum value of the overpressure, establishing a limit of 10% above the Steady State operating pressure.
  2. As the reference pressure B31.4 uses the static state pressure, in other words the designer shall use the Max. Static pressure from AFT Impulse instead of the Max. Stagnation pressure.
  3. Operating pressure shall be the reference for design instead of the design pressure calculated for the pipe.
  4. ASME Code for pressure piping B31.3. Process Piping

301.2.2 Required Pressure Containment or Relief

  1. (a) Provision shall be made to safely contain or relieve

(see para. 322.6.3) any pressure to which the piping may be subjected. Piping not protected by a pressure relieving device, or that can be isolated from a pressure relieving device, shall be designed for at least the highest pressure that can be developed. (b) Sources of pressure to be considered include ambient influences, pressure oscillations and surges, improper operation, decomposition of unstable fluids, static head, and failure of control devices. (c) The allowances of para. 302.2.4(f) are permitted, provided that the other requirements of para. 302.2.4 are also met.

302.2.4 Allowances for Pressure and Temperature Variations. Occasional variations of pressure and/or temperature may occur in a piping system. Such variations shall be considered in selecting design pressure (para. 301.2) and design temperature (para. 301.3). The most severe coincident pressure and temperature shall determine the design conditions unless all of the following Criteria are met: (a) The piping system shall have no pressure containing components of cast iron or other nonductile metal. (b) Nominal pressure stresses shall not exceed the yield strength at temperature (see para. 302.3 of this Code and Sy data in BPV Code, Section II, Part D, Table Y-1). (c) Combined longitudinal stresses shall not exceed the limits established in para. 302.3.6. (d) The total number of pressure-temperature variations above the design conditions shall not exceed 1000 during the life of the piping system. (e) In no case shall the increased pressure exceed the test pressure used under para. 345 for the piping system. (f) Occasional variations above design conditions shall remain within one of the following limits for pressure design. (1) Subject to the owner’s approval, it is permissible to exceed the pressure rating or the allowable stress for pressure design at the temperature of the increased condition by not more than (a) 33% for no more than 10 hr at any one time and no more than 100 hr/yr, or (b) 20% for no more than 50 hr at any one time and no more than 500 hr/yr.   From B31.3 extracted paragraphs the following conclusions can be drawn:

  1. Surge pressure is included in the group of loads called occasional.
  2. The piping design pressure shall take into account the maximum pressure that may occur in the system including surge pressure due to a transient event.
  3. The maximum surge pressure shall not exceed in any case the test pressure calculated for the pipe.
  4. The maximum stress produce the loads created by the surge pressure shall not exceed: 1.33 S(Sh=allowable stress for the operating temperature).

In order to meet the 3rd requirement the AFT Impulse user shall calculate the forces originated on  the bends of the system  and feed this data to a pipe stress program (see Trey- Jim Wilcox article: Evaluating Dynamic Loads in Piping Systems Caused by Waterhammerhttp://www.aft.com/training/white-papers) Conclusion The allowable pressure due to a transient event (surge allowable) varies from code to code. B31.4 refers directly to the maximum pressure value establishing as a limit 10% above the operating pressure. B31.3 not only establishes a surge pressure allowable (Test pressure) but also deals with the mechanical effect in the pipe, limiting the limiting piping  stresses to a maximum of 33% above Sh (Sh=allowable stress for the operating temperature).

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