Settings

The lower part of the windows has options for specific Mass Property Settings. The main Settings determine if the calculations are to consider negatives (holes/cut-outs):

Negatives:

The following options are available from the Negatives drop-down list:

A good example of choosing to use Consider(Net) or Ignore(Gross) is a steel plate panel with a hole, where a ‘net’ calculation will give the finished weight; but a ‘gross’ calculation will give the weight of the panel before the hole is cut.

Volume Of:

Element Only verses Element plus members.

The 'Volume of' ('Weight of' or 'Surface of' for other forms) is mainly to allow reporting of elements that may have geometry, and own other elements that also have geometry. A good example is a steel section (SCTN) that owns a fitting (FITT).

for example:

Weight of SCTN only = 1000kg

Weight of SCTN + FITT = 1057kg

Representation Level

When calculating any Mass Property, the system uses the Representation Mass value, input in the representation level field or set using the Setting > Graphics > Representation window. Representation Mass is similar to other representation settings for different drawing levels of detail of a pipe component or equipment.

For example, a very simple shape at say level 1 for a quick calculation of surface area rather than a very complicated set of detailed shapes that would mean a very complex (hence slower) calculation of the surface.

Units

Both metric and imperial units can be selected from the pull-down menu in Volume and Surface window.

Note:
Not available in Weight and Centre of Gravity (CofG) window.

Within Area

It is possible to calculate the Mass property of each element in the Selection grid:

Note:
Not available in Weight and Centre of Gravity (CofG) window.

• Volume/Surface inside

• Volume/Surface outside

• Free Volume inside (Volume window only)

If this option is to be used, then checking the option will make the gadgets active for input, or picking, of an ‘Area Definition’ AREADE such as a room; then specifically ‘inside’ or ‘outside’. It is possible to calculate the weight of all the elements within an area (AREADE) by adding the elements within an area to the list of elements to be processed then performing the calculation on only these elements.

Each option allows for setting and refreshing of the representation level to be used in the Mass Property calculation.

Centre of Gravity Setting

For Weight and Centre of Gravity Mass Properties only there are two additional setting options:

• Wet/Dry

• Include Piping and HVAC Insulation

• CofG WRT

• The Wet/Dry option for Dry weight and Wet weight, is used primarily for Piping and Equipment with fluids.

For Equipment the weight will normally be an input value USRWEIGHT with an optional USRWWEIGHT for wet weight.

The Include Piping and HVAC Insulation check box to add the insulation to the calculation of the Wet/Dry Settings.

The CofG WRT option is used to calculate the centre of gravity of an element with respect to another element.

You can input, for example an Element Name and Calculate will use this for the list of individual Centres of Gravities. If you change the CofG WRT value only the total Centre of Gravity will be refreshed. To refresh the individual Centre of Gravities the user must click Apply again.

Use the Ship Positions check box to change the coordinates format from XYZ to ship grid positions (FR, LH, LV).

Calculate

To calculate any of the settings applied in the Volume, Surface or Weight and Centre of Gravity window the user must click Apply.