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Fire Protection and Fire Prevention on Covered Bridges Part 2. Covered Bridge Preservation National Best Practices Conference June 5-7, 2003.

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fire protection and fire prevention on covered bridges part 2

Fire Protection and Fire Prevention on Covered BridgesPart 2

Covered Bridge Preservation

National Best Practices Conference June 5-7, 2003

Presented by: Robert H. Durfee, P.E. Hoyle, Tanner & Associates, Inc. Manchester, New Hampshire Burlington, Vermont

slide2

Summary of Recent Covered Bridge Fires

  • Several thousand covered bridges built but only about 850 remain
  • 34 bridge fires between 1992-2002
  • Average loss of 3-4 bridges/year
  • Only 10 bridges survived to be repaired
  • 4 bridges that survived had systems
  • 11 bridges or 32% lost in 2002 alone!
nature of covered bridge fires
Started by arsonists

Occurred at night

Bridges in remote locations

Few bridges had fire protection systems

Poorly lit or no lighting

Most bridges had been burning for some time until discovered

Nature of Covered Bridge Fires
slide4

Slate Covered Bridge, NH

  • 1993
  • Bridge totally engulfed by flames
slide5

Cedar Bridge, IA

  • 2002
  • Bridge totally engulfed by flames
key measures to protect covered bridges
Deterrence

Reducing the fire potential

Arresting the fire

Key Measures to Protect Covered Bridges
slide7

Deterrence

  • Fire Detection
  • Alarms
  • Lighting
  • Telemetering
fire detection
Smoke detectors

Flame detectors

Heat detectors

Heat detectors are best suited for covered bridges

Fire Detection
slide9

Heat Detector

Linear heat detector wire

slide10

Heat Detector

  • Haverhill/ Bath Fire October 2002
  • Linear heat detector works!
  • Damage localized
slide11

Deterrence

  • Fire Detection
  • Alarms
  • Lighting
  • Telemetering
slide12

Alarms

Audible bell or horn alarm recommended

Flashing strobe optional

slide13

Deterrence

  • Fire Detection
  • Alarms
  • Lighting
  • Telemetering
slide14

Lighting

Metal halide or mercury vapor lamps recommended

slide15

Deterrence

  • Fire Detection
  • Alarms
  • Lighting
  • Telemetering
slide16

Telemetering

Typical control panel with telemetering

reducing the fire potential
Retardant treated wood

Intumescent Paint

Intumescent paint is best suited for covered bridges

Reducing the Fire Potential
slide18

Intumescent Paint

Color or transparent finishes available

slide19
Hydrants

Pressurized hydrants

Dry hydrants

Sprinkler system

Arresting the Fire

slide21

Sprinklers

Typical Sprinkler Installation

slide22

Sprinklers

Sprinkler feed location is important

slide23

Sprinklers

Fire Department charging sprinklers

slide24
Cost vary depending on:

Length and width of bridge

Availability of water source

Remoteness of site

Distance to electrical/phone lines

Capabilities of local fire/police departments

Fire Protection Costs

slide25
Typical Bridge: 80’ long by 20’ wide

DETERRENCE

SystemCost per Square FootCost Per Bridge

Heat detectors, alarms, telemetering $7.00 $11,200.00

Lighting $4.00 $6,400.00

Fire Protection Costs

slide26
Typical Bridge: 80’ long by 20’ wide

FIRE POTENTIAL REDUCTION

SystemCost per Square FootCost Per Bridge

Intumescent Paint $6.50 $10,400.00

Fire Protection Costs

slide27
Typical Bridge: 80’ long by 20’ wide

ARRESTING THE FIRE

SystemCost per Square Foot Cost Per Bridge

Fire hydrant N/A $3,500.00

Dry hydrant N/A $2,500.00

Sprinklers $10.50 $16,800.00

Total for all systems: $48,300.00

Fire Protection Costs

slide28
Deterrence, fire detection and fire protection measures work!

Systems are cost effective (3% to 15% of total project)

Costs are generally one-time

Reduction in insurance premiums

Conclusions

slide29

Questions

Robert H. Durfee, P.E. Hoyle, Tanner & Associates, Inc. 150 Dow Street Manchester, New Hampshire (603) 669-5555 rdurfee@hta-nh.com