External water spray system

An external water spray system (EWSS) is a domestic external fire sprinkler system designed to protect homes from bushfires and wildfires. While external spray systems have long been used in fire protection for buildings and facilities^{[citation needed]}, EWSS refers to domestic bushfire/wildfire systems.

Usage

The types of systems vary greatly from a single impact sprinkler placed on a roof, systems installed during construction with sprays on all windows and doors, and small sprays damping gutters^{[citation needed]}. Some are installed using copper piping and sprays while others use common PVC piping.

Usage depends on type of risk and belief of effectiveness. Copper piping is used to withstand high temperatures that may be experienced during a fire front or for higher reliability^{[citation needed]} for in ceiling installations. External PVC piping is used where failure with exposure to high radiant heat is acceptable^{[citation needed]}, as at the time the system is considered have "done its job". This is a matter of personal judgment.

Issues

There is a lack of scientific research regarding EWSS. Other issues that may affect the effectiveness of an EWSS:

Sprinkler performance in high wind conditions typical in a bushfire
Home design
- High vulnerability areas. e.g. decking
- Garden beds near walls
- Window sills
- Large windows (heat radiation)
- Internal furnishings (e.g. curtains)
Home location
- Slope
- Surrounding vegetation
If defended by occupiers
Preparation (if prepared for defense)
If intended for remote (unattended) defense
Available water supply
Ember attack
Fire front (radiant heat)
Adjacent building or vegetation fire

Types

Roof impact sprinkler
Gutter sprays
Window spray / deluge

Commercial sprays designed for EWSS are available^{[citation needed]}, but most systems use commonly available irrigation sprinklers/sprays.

Research

External spray systems for buildings are well documented for protection from fires in adjacent buildings^{[citation needed]}. However, up there is little published scientific research on scientific information pertaining to the effectiveness of EWSS under varying wildfire conditions.^[1]

References

^ "Report from FPA on EWSS after 2003 bushfires, Fire Protection Association Australia (FPAA) External Water Spray Systems to Aid Building Protection from Wildfire" (PDF).

External links

[1] "Report from FPA on EWSS after 2003 bushfires, Fire Protection Association Australia (FPAA) External Water Spray Systems to Aid Building Protection from Wildfire" (PDF).

[1]