Standpipe/Riser Clearance in Floor Openings?

We have a combination sprinkler/standpipe riser through floor-level landings in a stairwell of our building. There is a project requirement to provide a pipe sleeve and "required clearance per NFPA 13". 

NFPA 13 gives very clear guidance on clearances in Section 9.3 (NFPA 13 2016 Edition), but that doesn't apply to this project as it is not required to be designed for seismic (Seismic Design Category B).

Where can I determine what clearance needs to be between the pipe and the hole in the concrete stairwell floors/ceilings? I'm not seeing any clearance requirement, but I surely could be missing something. Thanks in advance!

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