Fire Protection Systems

A (combustibles), B (flammables), C (electrical), D (metals). Understanding fire classifications is essential for selecting appropriate suppression methods.

Wet pipe, dry pipe, and pre-action. Different system types address various environmental conditions and protection needs.

The most common and reliable for heated spaces. These simple systems contain water in the pipes at all times for immediate discharge.

Mandatory in areas subject to freezing temperatures. These systems contain pressurized air or nitrogen in the pipes.

Require a two-step activation process, ideal for water-sensitive areas. Both detection and sprinkler operation needed before water release.

Used for high-hazard areas like aircraft hangars. All sprinklers are open, and water discharges from all heads simultaneously when activated.

Public mains and dedicated storage tanks. Reliable water supplies are critical for fire suppression systems.

Standard ratings and color codes. Sprinklers are designed to activate at specific temperatures.

Purpose and placement. FDCs allow firefighters to supplement system water supply and pressure.

Typically Siamese connections with 2.5" female threads. Standardized connections ensure compatibility.

Electric, diesel, and vertical turbine. Fire pumps provide additional water pressure when supply pressure is inadequate.

Maintain system pressure to prevent main pump short-cycling. These small pumps handle minor pressure drops and leaks.

100 psi at the base. Adequate water pressure ensures effective operation during firefighting operations.

Importance for optimal coverage and obstacle clearances. Proper placement ensures adequate water distribution.

Ordinary hazard (OH) and extra hazard (EH). Classifications determine water density and coverage area requirements.

Calculation method for determining requirements. Hydraulic calculations ensure sufficient water flow and pressure.

Downstream of a fire pump due to dezincification. High water velocities can cause dezincification, weakening pipes.

Required for high-hazard connections. RPZ devices provide the highest level of protection against backflow.

Critical importance to assess water supply adequacy. Drain tests verify available water supply volume and pressure.

Function and quarterly inspection requirement. These valves control water flow and activate water flow alarms.

Weekly test runs and dedicated power source. Regular testing ensures reliability and identifies problems.

Requirement for annual fire pump testing. Churn testing verifies pump performance at zero flow condition.

Mandatory semi-annual testing requirement for RPZ backflow preventers. Ensures critical devices function properly.

Monthly visual inspection and annual maintenance requirement. Ensures extinguishers are charged and accessible.