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

2-8 Earthquake Protection
Page 62 FM Global Property Loss Prevention Data Sheets
Table 19. Horizontal Seismic Design Loads for System No. 3.
Brace Location Nominal Diameter,
in. (mm)
1. Riser Bracing (RB)
Lateral
Longitudinal
8
(200)
8
(200)
8
(200)
8
(200)
Number x Length, ft (m) x
Weight/Length, lb/ft (N/m) xG=
1 x 150 x 47.7 x 0.5 =
(1 x 4.6 x 700 x 0.5) =
1 x 12.5 x 47.7 x 0.5 =
(1 x 3.8 x 700 x 0.5) =
=
=
1x15x47.7x0.5 =
(1 x 4.6 x 700 x 9.5) =
1x25x47.7x0.5 =
(1 x 7.6 x 700 x 0.5) =
=
=
Force, lb (N)
358 lb
(1610 N)
298
(1330)
656 lb
(2940 N)
358 lb
(1610 N)
596
(2660)
954 lb
(4270 N)
(The riser bracing will need to be designed to withstand simultaneously a 656 lb (2940 N) lateral and 954 lb [4270 N]
longitudinal horizontal seismic load.)
2. Feedmain Bracing
M,N,
-lateral
6
(150)
1x33x31.7x0.5 =
(1 x 10 x 465 x 0.5) =
523 lb
(2325 N)
(Braces M and N pick up the lateral load for 33 ft [10 m] of feedmain piping. Four-way braces T and Q will pick up the
16.5 ft (5 m) of piping north of Brace M and south of Brace N, respectively.)
O
-lateral
V
-longitudinal
8
(200)
6
(150)
3. Four-way Feedmain/Crossmain Bracing
Q
East-to-West Portion
lateral
longitudinal
8
(200)
6
(150)
6
(150)
4
(100)
1x25x47.7x0.5 =
(1 x 7.6 x 700 x 0.5) =
1x50x31.7x0.5 =
(1 x 15 x 465 x 0.5) =
1 x 12.5 x 47.7 x 0.5 =
(1 x 3.8 x 700 x 0.5) =
1 x 16.5 x 31.7 x 0.5 =
(1 x 5.0 x 465 x 0.5) =
3x10x31.7x0.5 =
(3 x 3.1 x 465 x 0.5) =
4x10x16.4x0.5 =
(4 x 3.1 x 241 x 0.5) =
East-to-West Total Load =
=
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596 lb
(2660 N)
793 lb
(3488 N)
298 lb
(1330 N)
262
(1163)
476
(2162)
328
(1494)
1364 lb
(6149 N)