Fire Sprinkler Earthquake Protection – Sway Bracing Abstract • Earthquake sway bracing for fire sprinklers will become normative in the EN12845 Annex • Building structures are protected against earthquakes and so should the life safety system of fire sprinklers Abstract • Fire sprinkler protection provided thru: – Joint flexibility – Proper clearances – Sway Bracing • Sway bracing consists of: – Lateral – Longitudinal – 4Way Abstract • Brace design is based on the amount of sprinkler pipe weight within a zone of influence (ZOI) for a given horizontal seismic load (“g” force) – Requires calculations and submittals to AHJ’s showing brace meets design loads Abstract • Brace assembly strength is limited to the load capacity of the weakest component – Requires 3rd party load testing & certification Today’s Presentation • Importance of bracing fire sprinklers • Brace assembly components • General rules for brace placement Importance of Bracing Fire Sprinklers FM Global - Understanding the Hazard “Lack of Earthquake Bracing on Sprinkler System” 10 Year Period (FM Global) • 561 earthquakes worldwide • $315 million (USD) in damages facilities • $560,000 (USD) average loss • 50% of average loss is due to sprinkler system failure How Damage Occurs • Building movement is different than the fire sprinkler pipe • Unbraced fire sprinklers damage may occur by: – Hitting walls, suspended ceilings or other building systems – Fittings break due to twisting – Couplings can separate or leak during excessive bending, rotation or movement Additional Concerns • Protecting against loss from fire or water leakage is a critical towards recovery from an earthquake • Time for water leak discharge to fill a 14 ft x 14 ft (4.3m x 4.3m) room to depth of 1 foot (30cm) based on 50 psi (3.4 bar): Pipe Diameter (in) (mm) 1/2 12 1 32 1 1/2 40 2 50 4 100 6 150 Time (minutes) 37 8.1 4.0 2.7 1.5 1.3 Ways to Avoid Sprinkler Damage • Bracing • Flexibility • Clearance • Other Considerations – Brace suspended ceilings – Weak brace and/or hanger attachments – Anchoring of equipment, tanks & racks Costs to Brace • 3 – 4% if installed with the sprinkler system • Retrofit costs vary widely from an estimated $100 - $500 USD per brace location Importance of Sprinkler Bracing - Summary • Critical after earthquake protection against: – Water leaks – Fires • Decreases loss of: – Property – Function / use of facilities • Increases life safety Brace Assembly Components Sway Brace Components Structure Attachment Brace Brace Clamp Structural Attachments CSBUNIV – Universal Structural Structural Attachments CSBBARJ – I-Beam Attachment Structural Attachments CSBIB – Adjustable I-Beam Attachment Structural Attachments CSBMA – Multi Attachment Brace Clamps – Lateral Only CSBQIKCL – Quick Grip Jr CSBQG – Quick Grip Brace Clamps – Lateral & Longitudinal CSBEZU and CSBSTU Universal Brace Clamp General Rules For Brace Placement Lateral Bracing Lateral Bracing • What: – Feed and cross mains (any size) – Branch and other piping > 2 ½” (65mm) diameter • Where: – 40 ft o.c. (12m) maximum spacing – On the last length of pipe at the end of a main – Within 6 ft (1.8m) of the end of the pipe Lateral Bracing Lateral Bracing • Can act as longitudinal brace if installed within 2 ft (0.6m) of piping braced longitudinally Note that Pipe A Diameter > Pipe B Diameter Longitudinal Bracing Longitudinal Bracing • What: – Feed and cross mains (any size) – Branches > 2 ½” (65mm) diameter • NFPA 13 Not Required • FM DS 2-8 Required if longer than 40 ft (12.2m) • Where: – 80 ft (24.2m) o.c. maximum spacing – Within 40 ft (12.2m) of the end of the pipe or change in direction Longitudinal Bracing Longitudinal Bracing • Can act as a lateral brace if installed within 2 ft (0.6m) of piping braced laterally Riser Bracing • Riser tops exceeding 3 ft (0.9m) in length • Maximum Spacing = 25 ft (7.6m) o.c. Thank You Any Questions??