DS 2-8 Earthquake Protection for Water-Based Fire ... - FM Global
DS 2-8 Earthquake Protection for Water-Based Fire ... - FM Global
DS 2-8 Earthquake Protection for Water-Based Fire ... - FM Global
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<strong>Earthquake</strong> <strong>Protection</strong> 2-8<br />
<strong>FM</strong> <strong>Global</strong> Property Loss Prevention Data Sheets Page 29<br />
words, the seismic design load on the fastener should not exceed the table values <strong>for</strong> the bolt<br />
size and configuration selected.<br />
c) Install welded studs in accordance with American Welding Society standard D1.1, Structural Welding<br />
Code. Stud load-carrying capabilities need to be adequate <strong>for</strong> the anticipated seismic load H.<br />
d) For attachment to other types of steel structural members, such as “C” or “Z” purlins, trusses, or<br />
joists, the adequacy of the structural member and the point of attachment to carry the anticipated<br />
load need to be determined as part of the system design and included with the system design<br />
in<strong>for</strong>mation.<br />
D. Make attachments to the sprinkler piping in accordance with the following guidelines. See Fig. 17 <strong>for</strong><br />
examples of bracing attachment to piping.<br />
1. Make connections, capable of carrying the anticipated seismic load, directly to the sprinkler piping<br />
with <strong>FM</strong> Approved connectors or with a pipe clamp, a U-bolt that is mechanically fastened to the brace<br />
using nuts and washers, or other positive mechanical means of attachment.<br />
2. Avoid methods of attachment that allow excessive movement, such as pipe rings, because they<br />
result in a loose fit.<br />
3. Provide verification of the load-carrying capacity <strong>for</strong> the attachment to the pipe with the system design<br />
in<strong>for</strong>mation.<br />
Length of lag screw<br />
under head,<br />
L, in. (mm)<br />
Table 8. Hole Dimensions <strong>for</strong> Lag Screws<br />
Length of shank,*<br />
S, in. (mm)<br />
Depth of lead hole,*<br />
in. (mm)<br />
⁄ ⁄ 2 (50) 1 2 (13) 1-3 4 (45)<br />
3 (75) 1 (25) 2-3 ⁄ 4 (70)<br />
4 (100) 1-1 ⁄ 2 (40) 3-3 ⁄ 4 (95)<br />
5 (125) 2 (50) 4-3 ⁄ 4 (120)<br />
6 (150) 2-1 ⁄ 2 (65) 5-3 ⁄ 4 (145)<br />
7 (180) 3 (75) 6-3 ⁄ 4 (175)<br />
8 (200) 3-1 ⁄ 2 (90) 7-3 ⁄ 4 (195)<br />
*Depth of hole <strong>for</strong> shank is the length of the shank minus the attachment thickness. For remainder of hole depth use lead hole boring only.<br />
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