DS 2-8 Earthquake Protection for Water-Based Fire ... - FM Global

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2-8 Earthquake Protection Page 52 FM Global Property Loss Prevention Data Sheets Fig. 23. Example of building with three sprinkler rises and three types of sprinkler system configurations Fig. 24. Layout and zones of influence for lateral and four-way riser sway bracing for System #1. ©2010 Factory Mutual Insurance Company. All rights reserved.
Earthquake Protection 2-8 FM Global Property Loss Prevention Data Sheets Page 53 Fig. 25. Layout and zones of influence for longitudinal and four-way riser sway bracing for System #1. C.2.1 Gridded System (System No. 1) Step 1. Layout and orientation of braces. Fig. 24 shows the layout of the two-way lateral braces, and a four-way brace at the riser. Fig. 25 shows the layout of the two-way longitudinal braces. In both figures, the dashed lines indicate the zone of influence for piping to be used to calculate horizontal seismic design load for each bracing location. In this example, the location of lateral and longitudinal sway bracing on the actual piping grid is fairly straightforward. However, because of the long feedmain, and the changes in direction, lateral bracing is strategically located within 2 ft (0.6 m) of the changes of direction, and will be used both as lateral bracing on the pipe to which it is attached, and as longitudinal bracing for the run of piping after the change in direction. This will be illustrated in Step 2. Step 2. Calculate design loads. In this example, a horizontal acceleration of 0.5 G will be used for calculation purposes. Assume sprinkler piping is Schedule 10. Using weights per length of water-filled pipe from Table 1, horizontal seismic design loads for each sway bracing location can be determined as shown in Table 17. Step 3. Select the proper brace type, size, and maximum length. Based on the configuration of the brace connection to the structure, the angle of the brace from the vertical, and the calculated horizontal design load, the brace type, size, and maximum length can be selected from Tables 2 to 7. Step 4. Using the Step 2 design loads, and the brace angle from the vertical, select the appropriate type and size of fastener for attachment to the building structure. ©2010 Factory Mutual Insurance Company. All rights reserved.
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DS 2-8 Earthquake Protection for Water-Based Fire ... - FM Global

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