| Term | Definition |
|---|
| Standpipe systems | consist of a fixed piping system and hose valve connections to preclude the need for long hose lays within tall or large buildings. |
| How the water is fed into these systems | through an automatic water supply or manually through a fire department connection. |
| Standpipe systems requirements are based on | building height or interior travel distances. |
| The complete installation standard for standpipe systems and Hose Systems is | NFPA 14. |
| Hose connections in Class I systems are typically | 21/2 inch threaded outlets. |
| The current preferred location for stairway hose connections | is at the intermediate stair landings between floors. |
| Fire attack using hose lines from stairway hose connections requires | stair doors to be propped open. |
| In buildings with a corridor system feeding multiple rooms, tenants, or agencies, designers should | locate remote hose stations within the corridor. |
| To ensure that the water supply, pipe sizes used, and pumps (if needed), will provide a certain flow and pressure at a specified numbers of hose connections in the system the new standpipe system are designed by | Hydraulic calculations. |
| The current NFPA 14 specifies a minimum design pressure for class I system of | 100 pounds per square inch (psi) at a specific flow rate, which depends on the number of hose connections per floor. |
| The distance between hose connections and remote areas of a building can be up to | 150 feet for buildings without complete sprinkler protection, and up to 200 feet for fully sprinklered buildings. |
| Pressure regulating devices (PRDs) restrict system pressures, usually below 175 psi for Class I systems is considered | the maximum safe operating pressure as well as the maximum working pressure limit of most fire protection components. |
| The standpipe isolation valves and riser isolation valve allow the fire department | to shut off, or isolate, any given riser or feed that breaks or otherwise fails. |
| In climates subject to freezing temperatures, | it is vital that standpipes in unheated areas be dry type systems |
| First, their failure rate has been high, resulting in the addition of testing requirements to NFPA 14. Secondly, many cannot be adjusted by firefighters during a fire, or they require special tools and knowledge. Finally, hose connections with these devices cannot be used as backup fire department inlet connections, since water can only flow through a PRD in one direction. | PRVs and pressure control valves desadvantages |
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