CA Fire Sprinkler flashcards
CA Fire Sprinkler · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Design density
- The minimum flow rate in gallons per minute per square foot that must be discharged over the design area, determined by occupancy hazard classification in NFPA 13.
- Remote area
- The hydraulically most demanding area of sprinkler operation used in calculations; its size depends on hazard, ceiling slope, and sprinkler response type.
- Hazen-Williams formula
- An empirical equation relating friction loss to flow, pipe diameter, and a roughness coefficient; used to compute pressure loss in sprinkler piping.
- Velocity pressure
- The pressure associated with the speed of water in a pipe, calculated as 0.001123 times flow squared divided by diameter to the fourth power.
- Balancing a junction
- Adjusting flow in one branch so its pressure matches the other branch at a common junction, using flow proportional to the square root of pressure.
- Hose stream allowance
- The flow in gallons per minute reserved for fire department hose use, added to sprinkler demand and applied for a specified duration.
- Fire pump churn
- The pump's shutoff condition with no flow; churn pressure is typically 110 to 140 percent of rated pressure and must be considered in system design.
- Standpipe Class I
- A standpipe system with 2½-inch outlets intended for fire department use, requiring 100 psi residual pressure at the topmost outlet.
- Water supply curve
- A plot of available pressure versus flow at the point of connection, derived from static and residual readings taken during a flow test.
- Hanger spacing
- The maximum distance between supports for sprinkler pipe, typically 12 feet for pipe up to 1¼ inch and 15 feet for larger sizes.
- Sway bracing
- A seismic restraint system that limits lateral and longitudinal pipe movement, installed at specified intervals along the piping.
- Deflector distance
- The required distance between a sprinkler deflector and the ceiling, typically 1 to 4 inches below noncombustible ceilings and up to 12 inches below combustible ceilings.
- Trapeze hanger
- A support consisting of a horizontal member suspended from two rods, used where individual hangers cannot be attached or where multiple pipes are supported.
- NFPA 13
- The standard for the installation of sprinkler systems in commercial and industrial occupancies, covering design, installation, and acceptance testing.
- NFPA 25
- The standard for inspection, testing, and maintenance of water-based fire protection systems, specifying frequencies for gauges, alarms, and main drains.
- Hydrostatic test
- A pressure test of piping at 200 psi for two hours, or 50 psi above working pressure if higher, to verify the system is leak-free before acceptance.
- Plan submittal
- The package of drawings, hydraulic calculations, water supply data, and manufacturer information submitted to the authority having jurisdiction for review and approval.
- Unit price contract
- A contract where the contractor is paid a fixed price per unit of work installed, requiring accurate quantity tracking for final billing.
- Retainage
- A percentage of each payment withheld by the owner until substantial completion, providing security for completion of the work.
- Change order
- A written modification to the contract scope, price, or schedule, signed by authorized parties, used to document and bill extra work.
- Schedule of values
- A breakdown of the contract price by work items, used as the basis for progress payments and tracking of completed work.
- Main drain flow test
- A test that opens the main drain to measure static and residual pressure and confirm the water supply can deliver the required flow.
- Waterflow alarm test
- An annual test that activates a flow switch or pressure switch to verify the alarm signals properly and is received at the monitoring location.
- Impairment procedure
- A documented process for taking a system out of service, including notification of the authority having jurisdiction and posting of a fire watch.
- Dry-pipe trip test
- A test that opens the dry-pipe valve to confirm it trips at the design air pressure and that water reaches the system within the required time.
- CSLB
- The California Contractors State License Board, which licenses contractors, administers exams, and enforces contractor law in the state.
- Qualifying individual
- The person who passes the trade and law exams and is listed on a contractor's license, responsible for the licensee's operations.
- Contractor bond
- A surety bond required by California law, typically $25,000, that provides protection to consumers for certain violations by a licensed contractor.
- Down payment limit
- A California rule limiting the down payment on home improvement contracts to 10 percent of the contract price or $1,000, whichever is less.
- Grooved coupling
- A mechanical pipe joint that connects grooved pipe ends with a gasket and clamp, allowing some movement and commonly used in seismic areas.
- Alarm check valve
- A valve that opens to allow water into the system and directs flow to an alarm device when a sprinkler operates, used in wet-pipe systems.
- Temperature rating
- The maximum ambient temperature at which a sprinkler is designed to operate, color-coded and selected based on the expected ceiling temperature.