Seismic Bracing Design – Fire Sprinkler System for Manufacturing Area (FM Global Compliant)

As part of the fire protection system design for Wrigley India Pvt. Ltd. (Baddi, Himachal Pradesh), I was responsible for the seismic bracing layout and calculations for the sprinkler network in compliance with FM Global Data Sheet 2-8.

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Scope of Work:

• Developed zone-of-influence (ZOI) plans for lateral and longitudinal sway braces

• Performed brace load calculations using FM-approved formulas:
  H = G × Wp, where G = 0.9 and Wp = water-filled pipe weight

• Calculated seismic loads for various braces (e.g., LAT-1 to LAT-4, LON-1 to LON-3)

• Used FM Table 3.1.5 and 3.1.8-C for weight and maximum allowable load checks

• Prepared detailed brace data sheets including:

  • Pipe sizes (2", 2½", 6")

  • Horizontal seismic loads

  • UTT10/UTT20 brace fittings and HILTI anchor selection

  • Maximum L/R = 200, fastener capacity = 1551 lbs

• Integrated seismic restraint design with layout drawing, coordinated typical details for risers and horizontal mains

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All calculations were verified for lateral and longitudinal bracing placement within FM Global’s maximum spacing limits:

• Lateral: ≤ 12 m (40 ft)

• Longitudinal: ≤ 24 m (80 ft)​​