2009

If you have a pipe requiring a specific thickness of insulation, then you may want to carry out a
clearance test on that pipe, setting the clearance tolerance to the required insulation thickness.
This would identify any areas where there is not enough clearance around the pipe to install the
insulation.
If you have various pipes, all requiring different thicknesses of insulation then rather than setting
up a separate clearance test for each thickness, you can set up one test with the greatest
necessary tolerance, i.e. assume all pipes require the maximum thickness of insulation. This rule
can then be applied to ignore any clashes that are falsely identified, as their actual insulation
thickness is less than the maximum clearance used.
See the diagram below for an example of where this ignore rule would be applied:
Pipe 1 has insulation thickness t and C is the maximum clearance (thickest insulation) required
anywhere in the current model. Any items (2) that come within the range of t to C will not be
reported in the results.
• Same Property Value. This rule will ignore clashing items that share a specific property.
Clash Rules
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