Fire sprinkler earthquake protection sway bracing
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Fire Sprinkler Earthquake Protection – Sway Bracing PowerPoint PPT Presentation


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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.

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Fire Sprinkler Earthquake Protection – Sway Bracing

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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):


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??


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