2012

■ Items in Previously Found Pair of Composite Objects - any items
found clashing that are part of composite objects (items composed of
multiple parts of geometry) that have previously been reported in the test
are not reported in the results.
■ Items with Coincident Snap Points - any items found clashing that
have snap points that coincide are not reported in the results. This can be
particularly useful for pipe runs made from cylinders.
Rule Templates
You can also create your own ignore rules. The following rule templates are
available (in addition to the default clash rules):
■ Insulation Thickness - any items found clashing that have the clearance
value greater than the specified insulation thickness are not reported in
the results. This rule should be used with a
Clearance (page 674) test.
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, that is, 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:
692 | Chapter 15 Locate and Manage Interferences