NFPA 13 184.108.40.206 says sprigs 4 ft and over shall be restrained againist lateral movement. Does any one know what type of restraint is to be used.
This document may be helpful to you.
ANSI SP-69-2003 Pipe Hangers and Supports – Selection and Application (ANSI-approved American National Standard)
If you read the appendix for that section cited, it will give you the answer,
Plus I would say it depends on where you are, in Calif, you may needed beefed up bracing vs some where in the mid west where they do no shake it.
OHHH I am not an engineer, so you can discount my reply if you want
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