AVEVA E3D 2.1 Clash Detection- CHAPTER 2

CHAPTER 2 2

Clash Detection

One of the principal reasons for building a 3D model of a plant in AVEVA E3D is the ability to detect clashes and thus produce a design that is as ‘clash free’ as possible. Whilst a completely clash free design is almost impossible to achieve, it is many times more expensive to resolve clashes during the fabrication, assembly or erection phase than it is in the design phase.

2.1

Overview of AVEV AVEVA A E3D Clash De Detecti tecti on

Project wide ‘clash runs’ are normally made at frequent intervals during the design process. They are generally timed events, set-up by the System or Project Administrator, and run during non-working hours. This type of clash detection enables clash reports to be produced and certain clashes to be ‘approved’ so that they are not reported again unless specifically requested. This type of clash detection is outside the scope of this training guide.

AVEVA E3D also provides the user with interactive i nteractive clash facilities so that clashes may be detected during creation or modification of model elements, or retrospectively, following completion of a particular part of the design (prior to it being checked or approved). These types of clashes cannot be approved. There is no ‘magic button’ that resolves clashes. Clash detection is passive. Clashes will be reported when asked, but actions that may cause a clash are not prevented. Therefore, if clashes are found in the design steps must be taken to resolve them.

2.2 2. 2

Obstruct ion Va Values lues

All model primitives and all catalogue primitives have an Obstruction attribute (Obst ) that define the physical type of obstruction the primitive represents. For catalogue items the Obstruction attribute value is determined during the creation of the catalogue item. For design primitives (e.g. a primitive used in equipment building and structural panels) the value is set by the user. The Obstruction attribute may have one of three integer values: 2, 1 or 0. 

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Obstruction = 2 – 2 – a hard obstruction. This value represents a solid element and is generally used for ‘real’ objects such as a piece of equipment, a steel beam, a pipe componen t, etc. Obstruction = 1 – a soft obstruction. This value represents a volume that is not solid but should be kept clear for access purpose. This value is generally used for access/escape routes, valve wheel access, stair headroom, tube bundle withdrawal volumes, etc. Obstruction = 0 – 0 – no obstruction. This value represents a freely accessible volume. It is generally used for simplified structural profile definitions, etc.

In addition to the obstruction types defined by the Obstruction attribute, Insulation is treated as a special obstruction type in its own right.

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2.3

Classes of Clash

As well as the three types of clashing item, i.e. hard, soft and insulation, AVEVA E3D uses three classes of clash depending on three values that may be set by the user, i.e. Overlap , Gap and Clearance. The three classes of clash are: 

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Physical Clash – the primitive volumes overlap by more than the Overlap value. Touch – the primitives either overlap by less than the Overlap value or are separated at their closest point by less than the Gap value. Clearance – the primitives are separated at their closest point by more than the Gap value but less than the Clearance value.

In the following scenarios the values are set to: Overlap = 5mm , Gap = 2mm and Clearance = 8mm .

 Care should be taken when setting the values for overlap, gap and clearance as, both individually and in combination, they can make an enormous difference to the number of clashes detected.

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Scenario 1 - primitives overlap by more than 5mm, a clash is reported.

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Scenario 2 - primitives overlap, but by less than 5mm, a touch is reported.

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Scenario 3 - primitives do not overlap but are separated by less than 2mm, a touch is reported.

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Scenario 4 - primitives are separated by more than 2mm but by less than 8mm, a clearance is reported.

If the primitives are separated by more than 8mm then no interference is found.

 The Clearance value, if set, must be greater than the touch Gap value. Setting the Clearance value to 0 switches off the clearance checking function.

2.4

How AVEVA E3D Repor ts Clashes

Physical clashes, touches and clearances occur between two elements. The element that is being checked is known as the Clash Item and the element that interferes with it is known as the Obstruction Item . When clashes, touches and clearances are reported the class of clash is prefixed by the type of obstruction of the Clash Item and the Obstruction Item. The Clash Item is always specified first, for example: 

HH Hard/Hard – the Obst value of both the Clash Item and Obstruction Item is 2.

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HS Hard/Soft – the Obst value of the Clash Item is 2 and Obst value of the Obstruction Item is 1.


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HI Hard/Insulation - the Obst value of the Clash Item is 2 and the Obstruction Item is insulation .

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SS Soft/Soft – the Obst value of both the Clash Item and Obstruction Item is 1.

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SH Soft/Hard - the Obst value of the Clash Item is 1 and Obst value of the Obstruction Item is 2.

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SI Soft/Insulation - the Obst value of the Clash Item is 1 and the Obstruction Item is insulation .

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II Insulation/Insulation – both the Clash Item and the Obstruction Item are insulation .

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IH Insulation/Hard – the Clash Item is insulation and the Obst value of the Obstruction Item is 2.

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IS Insulation/Soft – the Clash Item is insulation and the Obst value of the Obstruction Item is 1.

Therefore, interferences may be reported as HH Clash, HH Touch, HH Clearance, HS Clash, HS, Touch, H S Clearance, etc. Clashes between the following pairs of items are no t reported: 

Primitives belonging to the same equipment.

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Two structure or substructure primitives having the same owner.

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Two piping components that are connected.

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A piping component and the nozzle to which it is connected.

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Any component or primitive that has its obstruction value set to 0.

2.5

Settin g Clash Optio ns

The number of clashes reported during a clash check depends greatly on the options chosen and the values of the parameters discussed previously. Functionality relating to clashing is accessed from the Check group when working in discipline specific modules. The Clashes view can be accessed by navigating to the HOME tab and selecting Clashes > Clashes from the Check group, this will open a new 3D view alongside the current view called Clashes . It is worth noting that when the Clashes view current forms will remain open and may overlap the Clashes for m . At this point it is often helpful to hide all other forms; forms may be hidden by pressing F2 key or by pressing the Clear Canvas button, located in the top right of the window. Pressing F2 or the clear canvas button again will return all previously open forms.

The Clashing options are located on the Options tab.


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Tolerances provide settings for Touch Gap, Overlap and Clearance are set by entering the required values in the appropriate textboxes. Clash options determine the behaviour of the clash checking operation, with the following settings. Touches are option list enables the user to specify whether touches (and clearances) are to be Included or Ignored .

The Clashes within Branch options list enables the user to specify how Branches are checked and has the following options: 

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are Included – this option runs the ACHECK function which performs a primitive-by-primitive check of every component in each branch. are Ignored – this option ignores clashes within individual Branches but reports clashes between items in different Branches. Ignore Adjacent – this option runs the BCHECK function which is a simplified check that ignores the possibility of clashes between certain pairs of components within the Branches.

 The ACHECK and BCHECK functions are part of the DESCLASH command set. See the help files for details of these commands.

The Connections options list enables the user to control clash checking at steelwork junctions. Clashes between sections and attached joints are ignored automatically. However, if end preparations at steelwork joints have been left until late in the design process, clash reporting at connections may be inhibited using the following options: 

are Included – (default) includes all steelwork connections.

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are Ignored – ignores all steelwork connections.

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With Spec. are Ignored – ignores only those connections that have specifications, i.e. the SJOIs Spref attribute is set.

The Clash Midpoint Position checkbox enables the position of the clash to be more accurately determined. By default, the reported position of a clash depends on which part of the overlapping region is first detected. In most cases this identifies with sufficient accuracy the clash. Checking the Clash Midpoint Position Copyright © 2013. AVEVA Solutions Limited and its subsidiaries. All rights reserved.

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checkbox makes the reported clash position the centre of a box surrounding the overlapping region. Using this option will give more reproducible results but may be slower. The Clash Colours determine the colour of the Clash Item, Obstruction Item and background Colour when the clashes are displayed in the 3D view. Clicking the Major Clash Items button displays the Major Clash Items Colour form, clicking the Obstruction Items button displays the Minor Clash Items Colour form and clicking the View Background button displays the View Background Colour form. The required colour may be selected from the palette and clicking Cancel on any of the forms sets the colour selection.

Presentation defines how the clash information is displayed. Group Clash/Obstruction – if checked groups the clashes grid on the Clashes tab by clash and obstruction item. Clash Item Ai d – if checked displays aid label within the 3D view detailing the name of the clash item. Clash Obstruction Aid – if checked displays an aid label within the 3D view detailing the name of the obstruction item. Clash Position Aid – if checked displays an aid label within the 3D view detailing the position of the clash using the current session coordinates. Clashes Ignored Within enables clashes within certain elements to be ignored, but still report clashes between different elements. Each applicable element type is shown with an adjacent checkbox. Checking a box next to an element type will cause clashes within that element to be ignored. If the box is left unchecked then clashes are included .

Clashes can be ignored within the following elements: PIPE

Pipework

STRU

Structure

BRAN

Branch

SUBS

Sub-Structure

PTRA

Pipe Track

FRMW

Framework

HANG

Hanger

SBFR

Sub-Framework

REST

Restraint

SCTN

Section

EQUI

Equipment

GENSEC

Generic Section

TMPL

Template

PCOJ

Primary Collinear Joint

CWBRAN

Cableway Branch

PLTFRM

Platform

CPANEL

Curved Panel

SITE

Site

HPANEL

Hull Panel

ZONE

Zone

STRFLT

Stair Flight

HANDRA

Handrail

RLADDR

Rung Ladder

The Save/Restore frame allows the saving of current or retrieval of previous clash checking options.


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The Reset System Defaults button resets the form settings to the system defaults which are read from a system file when AVEVA E3D is opened. The Save button saves the current option settings to a user options file. The Restore button reads the saved user options file and sets the options accordingly.

2.6

Specifyi ng What to Clash Check Against

Having set the clash options the items to clash check against must be specified. The items to check against may be specified by an Obstruction list of explicit elements or by setting clash limits where all elements within those limits are used.

2.6.1

Obstruct ion List

Selecting the Obstructions/Exclusions tab on the clashes form displays the Obstructions and Exclusions Lists.

This tab defines which elements will be used to clash against. This can be performed in two ways. By explicitly selecting all the obstructions to clash against, or by excluding the specific elements that will not be clashed against. The top half of the tab is the Obstructions list , where the obstructions the checked item(s) will be clashed against are specified. The default content of the list is Al l , meaning that all Design items in the MDB will be used to check against. There are several ways in which items may be added or removed from the list. However, with Al l set, no other elements can be added to the Obstructions list. All must be removed before other elements can be added. The Add button works in conjunction with the adjacent options list which has the following options: 

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Current Element – with this option, clicking the Add button adds the CE to the Obstructions list. Pick Element – with this option, clicking the Add button displays the prompt ‘Pick element to Add ’ . The required elements are graphically picked from the 3D view and are highlighted. Pressing the Esc key will add the picked items to the Obstructions list.


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Current Selection – with this option, clicking the Add button adds all elements selected in the 3D view to the Obstructions List. Multiple items can be selected by holding down the Ctrl key when picking from the 3D View. Current Collection – with this option set, clicking the Add button adds the contents of the current collection to the Obstructions list. Al l – with this option set, clicking the Add button removes any elements currently in the Obstructions list and replaced it with the key word Al l , meaning all elements within the MDB will be checked against.

The Remove button removes the current selection from the Obstructions list. The button is only available when a selection is made from the list. The Clear button removes all items from the Obstructions list. A confirmation box appears before the List is cleared. Clicking Yes on the message clears the list. Clicking No will cancel the operation and retain the List.

 When an element is added to the Obstruction List, all elements and primitives below the specified item (i.e. its members) are automatically incorporated in the list. If a Branch (or higher) element is added to the Obstruction list, implied tube within the Branch is treated as part of the obstruction. If individual piping components are added to the list, implied tubing connecting those components is not automatically included and must be added explicitly if required.

The bottom half of the tab shows the Exclusions list , where the items selected are excluded from the clash checking operation. This list may be used to exclude specific elements from the clash check. For example, if the element’s Owner has been included in the Obstruction list. Any elements in the Exclusion list will not be considered during clash checking. The default Exclusion list is empty. The Exclusions list options work the same as those for the Obstruction List; with the exception of the Add Al l option as adding all items to the obstruction list would void the clash checking operation.

2.6.2

Clash Lim its

By default, all parts of the model relevant to the current Obstruction List will be checked during a clash check run. However, if the entire design is not required to be checked a restricted region of interest may be specified using a Clash Limits box. The Clash Limits box is defined from the Limits tab in the Clashes form.


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The Limits tab enables two opposing corners of a box to be specified, defining the clash limits. The coordinates of the box corners may be specified by entering values in the From and To textboxes. Each co-ordinate direction can be swapped by selecting the drop down list adjacent to the relevant textbox. A direction can be locked to preserve its value by checking the checkbox next to the relevant textbox. The Clash Limits box may also be defined b y using the Volume drop down list. Current Element - this sets the Clash Limits box to the limits of the current element. The co-ordinates are displayed in the relevant From and To textboxes. Picked Elements – this displays the prompt ‘Pick element to add to list for enclosing box ’ . The required elements are graphically picked from the 3D view and are highlighted. Pressing the Esc key will set the Clash Limits box to the limits of the picked items. The co-ordinates are displayed in the relevant From and To textboxes. Defined by 2 picks - this displays the prompt ‘Pick First Clash Limit’ and activates the Positioning Control form . This then allows the use of any of the positioning control functions to select the first, To , corner of the limits box. Once the first point is picked the prompt is changed to ‘Pick Second Clash Limit’ . Once the second From point is selected the co-ordinates are displayed in the To and From textbox. Current Selection – this sets the clash limits to all elements selected in the 3D view. Multiple items can be selected by holding down the Ctrl Key when picking from the 3D View. The co-ordinates are displayed in the relevant From and To textboxes. Current Collection - This sets the clash limits to all elements contained within the current collection. The co-ordinates are displayed in the relevant From and To textboxes.

 For a clash to be reported, both items involved in the clash must lie wholly or partially within the Clash Limits box. A clash between items that lie partially within the Clash Limits box will always be reported, even if the point at which they clash occurs outside the box.

The Clear button can be used at any time to reset all values from the To and From textboxes to 0. The Display checkbox is used to toggle on and off an aid representation of the limits box. The aid shows the clash limits as a wireframe box and marks the To and From corners of the limits box with aid labels.


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2.7

Aut o Clash

Auto Clash may be turned on by selecting HOME > Check > Clashes > Auto Clash button. When Auto Clash is switched On , a clash check is carried out at the end of every command in which an element has been modified in some way that could cause a clash to occur, for example: 

When a new element has been created.

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When an element's position and/or orientation has been changed.

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When an element's geometry has been changed.

Each clash check is carried out using the current clash options and Obstructions/Exclusions Lists. If the Obstruction List is extensive, Auto Clash may have a small overhead in performance so it is good practice to consider the contents of the Obstruction List or restrict the volume being considered using a Clash Limits box. Auto Clash is very useful where a few new items are to be added to an existing design which has already been checked for clashes. Auto Clash starts checking when it is switched On . Any clashes that have occurred before that time are not considered. Similarly, Auto Clash stops checking as soon as it is switched Off. Any clashes that occur after that time are not considered. When a clash is detected the Clash Item and Obstruction Item are highlighted in the colours specified in the Clash Options. If a clashing element is already in the Drawlist it will be highlighted in the appropriate colour. If the element is not currently displayed, it will be added to the Drawlist automatically, in the default visible colour, and will then be highlighted in the appropriate colour. The element stays highlighted until another clash is found, until all graphical highlighting is specifically removed, or the clash is resolved. The results of each clash check replace those of any previous checks, so any reported clashes must result from the actions of the last command. The user’s attention will normally focus on the current element, so graphical highlighting is used to show the clash, rather than outputting the clash data to file. Copyright © 2013. AVEVA Solutions Limited and its subsidiaries. All rights reserved.

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 In order to avoid spurious clash reports when a new Branch is created, the last section of implied tube in a Branch is checked only if the Branch LTAI attribute is set to True. (The LTAI attribute is set automatically when the Branch Tail is positioned).

The clash-checking rules are as follows: 

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If the current element is a Piping Component and is the last component in the Branch, then its leave tube is checked only if the Branch LTAI attribute is set to True. If the current element is a Branch which has no members, then the tube which constitutes the Branch is checked only if the Branch LTAI attribute is set to True.

2.8

Clasher

In addition to Auto Clash, AVEVA E3D provides the user with interactive clash detection utility which may be used at any time. If Auto Clash is not used, it is good practice to use this utility whenever a significant part of the model has been completed so that any errors in the design can be resolved before impacting on other model elements. Selecting HOME > Check > Clashes > Clashes displays the Clashes view. Clash information is found on the Clashes tab .

The Clashes form, allows a graphical display of clashes and a Clash List of all the clashes found during the clash check. Clash checking and viewing of the results is controlled by the form tabs and the 3D view pop-up menu, as described in the sections that follow.

 For use of the 3D View controls and functionality refer to the TM

1801 AVEVA Everything3D™

–

Foundations training guide.

2.8.1

The Clashes Form

The Clashes form contains options to initiate a clash check and modify the 3D view to show the clash. It has the following options. 

Check CE – this option initiates a clash check of the CE against the Obstruction List.


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 It is good practice to initiate clash checks on small items, e.g. a Pipe or Branch, a FRMW or SBFR, etc., so that the displayed results are manageable. 

Check – this option initiates a clash check of the Element defined in the adjacent text box against the Obstruction List. An element Name can be directly entered into the textbox for checking.

The Clip Box check box toggles a clip volume within the 3D view. If checked the 3D view is clipped around the position of the clash. The size of the clip box is defined by the text box adjacent to the checkbox. The default value is 2000mm. This can be changed by entering a value or by using the slider. As the slider is moved to the right the value in the box is increased and the 3D view is updated. Likewise moving the slider to the left decreases the value within the textbox. If the Clip Box checkbox is unchecked then the entire of the current drawlist will be displayed in the 3D view.

 Any elements which are checked are automatically added to the current drawlist. Likewise any obstructions found to be clashing with a checked item are also added to the current drawlist.

The Clashes form also displays the details of the current clash selected in the Clashes Grid . This is shown as a label at the top of the form. The details shown update as the user navigates between clashes.

2.8.1.1 Clash Gri d The Clashes tab displays the resulting information following a clash check and allows the viewing and organising of the results and navigation to the Clash and Obstruction Items. The clash information is displayed within the Clashes Grid . The information within the grid is displayed with the following headings. 

Clash number.

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Clash – Checked / Obstruction Item, i.e. HH or HS.

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Clash Type.

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Clash Item (Checked Item).

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Obstructer.

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Clashed low level elements.

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Clash Easting.

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Clash Northing.

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Clash Elevation.

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Clash Owning Element.

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Obstruction Owning Element.

The clash results can be sorted and grouped by one or more column headings. To group by a heading click and hold the left mouse button on the heading and drag the heading into the grey area above the grid. Any of the columns can be filtered using the standard grid gadget filtering, utilising the options available in the cell below the heading title. Selecting a clash from the grid automatically updates the 3D view to display the current clash. The information for the selected clash is also displayed at the top of the clashes form.


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The Navigate check box defines the relationship between the clashes grid and the Model Explorer. Unchecked the explorer will remain unchanged as clashes are selected from the grid. If checked it activates the adjacent drop down menu. This has two options: 

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Clash Item – selecting this option will navigate to the Clash Item in the Model Explorer for the clash highlighted in the clash gird and make it the CE. Obstruction Item – selecting this option will navigate to the Obstruction Item in Model Explorer for the clash highlighted in the clash grid and make it the CE.

Right clicking anywhere in the clash grid shows a pop-up menu with two methods for the export of the clash grid information. Print Preview – Opens the standard print preview form allowing the page setup to be defined and the grid printed. Save to Excel – Prompts the user to browse to a file location and save the grid as a Microsoft Excel, .xls, file. This then saves the file to the selected location.

 Any grouping or filtering applied to the grid is maintained within the export. However the print preview only displays the group titles and not the lower information. Excel export provides all the grid information in the same format as the grid gadget.

2.8.1.2 Clash Repor ti ng The clasher utility has the ability to generate a text report of the clash checking results. The reporting functionality is located on the Report tab of the Clashes form.


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The default setting when running a clash check is no t to create a report. When this is the case the report options are inactive. By checking the Report to file when checking for clashes checkbox the clash checker will automatically create a report of its results and the options for this report are then activated. The Position frame sets the presentation of the clash position. World – Reports the position with respect to the world origin. Site – Reports the position with respect to the owning site of the clash item. Off – Position of clash is not reported.

The Duplicate frame sets the option for reporting clashes which appear multiple times within a clash check. When clash checking it is possible for an obstruction in one clash to be the clash item in another. As such it is possible for an item to be a both a clash item and an obstruction item and thus the same clash is reported twice. These options allow the report to take this into account. First – Reports only the first element within the clash and ignores the second. Second – Reports only the second occurrence of the clash and ignores the first. Both - Reports the first and second clash occurrences.

The Levels frame sets the types of clashes that will be reported. Clashes – Will report any physical clashes found. Clearances – Will report any clearance clashes found. Touches – Will report any touch clashes found.

The Report Format frame allows the report layout to be customised. Header – Adds header information to the top of the report such as Date and Time of clash check; the types of clash reported; any non-default checking options and limits; the touch and clearance limits; any special reporting options in use. An example is shown below. Date 11 Mar 2013 Time 10:03 Report on All CLASHES TOUCHES CLEARANCES in:ZONE /ZONE-PIPING-AREA01 Touches defined as 2mm overlap to 0mm gap No clearance defined Branch check option ACHECK selected Clashes included between connected SECTIONs Clashes ignored within GENSEC, TMPL, CWBRAN, PLTFRM, SCTN, PCOJ, SITE, ZONE, EQUI, CSURPX, CPANEL, HPANEL, STRFLT, RLADD R, HANDRA Primary clashes only are reported All items specified as obstructions

Main Body – Details of the clashes found, including the clash type and extent and the identifiers of the two design items involved. The clashes are grouped into sections , one for each significant element that contains interference. An example is shown below. ZONE /ZONE-PIPING-AREA01 PIPE /100-B-1 BRANCH /100-B-1/B1 1 HH =16410/37 FLANGE 2 with =16432/513 BOX 4 of TMPLATE 1 of :PUMP /P1502B AT WORLD COORDINATES W307299 N303517 U100557


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Numbering – Adds the relevant clash number from the clash grid to the clash main body within the report. Primary - Reports only the first or highest priority clash found between two significant elements (i.e. suppresses multiple clashes, including those between different primitives of the same pairs of significant elements). Obstruction – Adds the obstruction list to the header information. Reference – Adds database reference numbers to the clash and obstruction items in the main body. Clash Summary – Lists the total number of clashes of each type found; the total number of elements checked and the number of elements found to be interference free. If the Primary option was selected the summary will be divided into the Primary clash summary and the Actual Clash summary. An example of this is shown below. ***PRIMARY CLASH SUMMARY*** 35 hard/hard clashes 1 hard/soft clashes 30 hard/hard touches 87 significant elements checked 48 significant elements interference free ***ACTUAL CLASH SUMMARY*** 85 hard/hard clashes 2 hard/soft clashes 30 hard/hard touches

The Listing frame allows a list of the selected element types that are checked to be incorporated into the report. Checking the List Elements checkbox activates the list. The default value for all element types is On . Clicking on a row in the list toggles the Check column On or Off . The destination and name of the report file can be set via the Report to file frame. The default destination and file name is, %AVEVA_DESIGN_USER%/MyReport.txt. This can be changed by typing in the required filename and path or by navigating to the required location using the Browse button. This opens a standard windows dialogue box, where the required location and filename can be entered.

 The AVEVA_DESIGN_USER folder can be thought of as a storage area for settings, files and defaults created or setup by the user. The information held in the folder may interact with many aspects of AVEVA E3D but is essentially independent of the programmes function. The AVEVA_DESIGN_USER folder is typically located at C:\Users\Public\Documents\AVEVA\USERDATA .

The Reset System Defaults button resets the form settings to the system defaults which are read from a system file when AVEVA E3D is opened. The Save button saves the current user options. The Restore button reads the saved user options file and sets the options accordingly.


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Exercise 1

Clash Detection

Add the ZONE named /ZONE-PIPING-AREA01 below the SITE /SITE-PIPING-AREA01 to the 3D view. Drag to 11 O’clock on the PowerWheelTM to set Limits to Extents . Select HOME > Check > Clashes > Clashes to display the Clashes form . Navigate to the Options tab in the Clashes form. Check the Clash Midpoint Position checkbox. Set the Major Clash Items colour to Yellow and the Obstruction Items colour to Cyan . Select the Obstructions/Exclusions tab to display the Obstructions and Exclusions list. Click the Clear button on the Obstruction List, then the Yes button on the confirmation message box. The Obstruction List should now be empty. Navigate to the ZONE named /ZONE-STRUCTURAL-AREA01. Ensure Current Element is selected from the add obstructions drop down box and click the Ad d button. Note that the ZONE has been added to the Obstructions List. Repeat the operation to add the ZONE named /ZONE-EQUIPMENT-AREA01 to the Obstructions List. Select the Clashes tab on the Clashes form to display the Clash List . Navigate to PIPE 150-A-57 in the Model Explorer to make it the CE. Click the Check CE link label from the main form. There should be two clashes displayed in the Clash List and the 3D View should have updated to show a clipped view around the clash area.

Note that in the main 3D view a structural section, coloured Cyan has been added, indicating that it is the Obstruction Item. Also note that the two tubes on the selected Pipe are coloured Yellow , indicating they are the Clash Items.


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Check the Navigate checkbox. Then select Obstruction from the dropdown list. Select the second clash and note that the Obstruction Item (i.e. the GENSEC) is now the CE in the Model Explorer. To resolve this clash it may be necessary to raise the pipe to clear the beam or, lower the beam to clear the pipe. The resolution would need to be agreed between the disciplines. Remove the ZONE named /ZONE-PIPING-AREA01 and the ZONE named /ZONE-STRUCTURAL-AREA01 from the 3D view. Navigate to PIPE 100-B-1 in the Model Explorer and again click the Check CE link label from the Clashes form. There should be fifteen HH Touches in the Clash List. Sort by the results by theClash Item column.

Select the fifth clash in the Clash List , i.e. HH TOUCH ELBOW 9 OF BRANCH /100-B-1/B1 (tube) . The detail of the clash can be found by sliding the grid gadget across to reveal all the columns in the grid. An overview of the selected clash can be seen at the top of the clashes form.

This clash is a ‘touch’ between the leave tube of ELBOW 9 of the branch and a beam on ROW_J.

Select the North option on the PowerCompass TM to look north, then zoom in so that the touch between the tube and the structural section is clearly shown:


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This clash is classed as a touch because the default settings of Overlap 2, Gap 0 and Clearance 0 are being used. The tube is not overlapping the section but resting on it, therefore, it is not a Clash but a touch. Select the Options tab to display the Clash Options. Modify the Touch Gap setting to 1 and the Clearance setting to 5 and click the Save button. Select the Clashes tab . Navigate to PIPE 100-B-1 in the Model Explorer again and select Check CE to rerun the clash check with the new settings. Note that three clearances have been added to the Clash List , demonstrating the importance of getting the clash settings right.

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Select the Report tab. To create a clash report during clash checking check the Report to file when checking for clashes checkbox. Uncheck the Primary and Reference checkboxes, as all clashes will be reported on but the database reference for each clash item is not required. Click theSave button. Select the Clashes tab and navigate to the ZONE /ZONE-PIPING-AREA01 in the Model Explorer to make it the CE. Select Check CE from the Clashes form. The form should now display a considerable number of clashes. A text report detailing the clash check findings can be found in the AVEV A_DESIGN_USER directory with the default name MyReport.txt .


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The clash summary at the bottom of the report should be as below. ***ACTUAL CLASH SUMMARY*** 17 hard/hard clashes 1 hard/soft clashes 25 hard/hard touches 30 hard/hard clearances 87 significant elements checked 56 significant elements interference free

Note the total number of clashes and close the report. Change the default Touch Gap and Clearance settings on the Options tab back to 0 and save them. With the ZONE /ZONE-PIPING-AREA01 as the CE, again select Check CE from the Clashes form. As the name for the clash report was not changed the old text file is overwritten. The summary from the clash report should now be as below, again note that the number of clashes has been reduced. ***ACTUAL CLASH SUMMARY*** 17 hard/hard clashes 1 hard/soft clashes 22 hard/hard touches 87 significant elements checked 72 significant elements interference free

Check PIPE 100-B-8 and decide how the clashes might be resolved.


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AVEVA E3D 2.1 Clash Detection- CHAPTER 2

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