Running a clash detection scan or report will typically bring up many duplicate instances of the same issue. If a single run of pipework clashes with five beams, it will show as five clashes though, in reality, resolving one issue (the placement of the pipework) will solve all clashes. Reviewing and cancelling these clashes in the design is a key part of the BIM process. As with any automated process these kinds of scans should not be relied upon in isolation and should form part of wider design co-ordination processes.
How to avoid Clash?
Clash avoidance is a key part of the design and construction process. Documenting a set of standard procedures in a BIM Execution Plan (BEP) and setting out procedures for co-ordination in Employer's Information Requirements (EIR) as part of a project's contract documentation are crucial. So too are the BIM Execution Plans authored by suppliers. During the design and construction process, design team interface managers should assess design decisions and clashes to see if they can resolve them internally, and where this cannot be done, separate models may be combined for review by a design lead.