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Questions and Answers
What is the purpose of a standpipe system?
What is the purpose of a standpipe system?
A standpipe system is intended to eliminate the need for excessively long runs of hose for manual firefighting.
What is a Class 1 standpipe?
What is a Class 1 standpipe?
Intended for fire department use only, equipped with a 2 1/2 in. (65 mm) angle valve for hose attachment.
What NFPA standard covers standpipes?
What NFPA standard covers standpipes?
NFPA 14
What is a Class 2 standpipe?
What is a Class 2 standpipe?
How long can the hose be in Class 2 standpipes?
How long can the hose be in Class 2 standpipes?
How many GPM's and at which PSI do Class 2 standpipes discharge at?
How many GPM's and at which PSI do Class 2 standpipes discharge at?
What is a Class 3 standpipe?
What is a Class 3 standpipe?
How is a standpipe system tested?
How is a standpipe system tested?
How are dry systems tested?
How are dry systems tested?
What are the minimum qualifications that need to be met during a flow test at the most hydraulically demanding riser for a Class 1 standpipe?
What are the minimum qualifications that need to be met during a flow test at the most hydraulically demanding riser for a Class 1 standpipe?
What is the minimum GPM and PSI for every additional riser in a building with a Class 1 standpipe?
What is the minimum GPM and PSI for every additional riser in a building with a Class 1 standpipe?
What should be the minimum total GPM of all Class 1 standpipes flowing simultaneously in a building that is not completely sprinklered?
What should be the minimum total GPM of all Class 1 standpipes flowing simultaneously in a building that is not completely sprinklered?
What should be the minimum total GPM of all Class 1 standpipes flowing simultaneously in a building that is protected throughout with an automatic sprinkler system?
What should be the minimum total GPM of all Class 1 standpipes flowing simultaneously in a building that is protected throughout with an automatic sprinkler system?
What NFPA standard covers sprinkler systems?
What NFPA standard covers sprinkler systems?
How many different classes of standpipes are there?
How many different classes of standpipes are there?
How many different types of standpipes are there?
How many different types of standpipes are there?
Describe the 'wet type' of standpipe system.
Describe the 'wet type' of standpipe system.
Describe the 1st 'dry' type of standpipe.
Describe the 1st 'dry' type of standpipe.
Describe the 2nd 'dry' type of standpipe.
Describe the 2nd 'dry' type of standpipe.
Describe the 3rd 'dry' type of standpipe.
Describe the 3rd 'dry' type of standpipe.
On the 3rd type of dry standpipe, how do some systems help reduce filling time by the engine?
On the 3rd type of dry standpipe, how do some systems help reduce filling time by the engine?
How far apart should Class 3 standpipes be spaced out in a building?
How far apart should Class 3 standpipes be spaced out in a building?
How far apart should Class 2 standpipes be spaced out in a building?
How far apart should Class 2 standpipes be spaced out in a building?
What is the minimum water supply for a Class 1 standpipe?
What is the minimum water supply for a Class 1 standpipe?
What is the minimum water supply for a Class 2 standpipe?
What is the minimum water supply for a Class 2 standpipe?
What is the minimum water supply for a Class 3 standpipe?
What is the minimum water supply for a Class 3 standpipe?
What is an FDC and how many are required for Class 1 and 3 standpipes?
What is an FDC and how many are required for Class 1 and 3 standpipes?
How often should a standpipe be tested and maintained?
How often should a standpipe be tested and maintained?
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Study Notes
Standpipe Systems Overview
- Standpipe systems facilitate firefighting by reducing long hose runs.
- NFPA 14 governs the standards for standpipe systems.
Classifications of Standpipes
- Class I: For fire department use; equipped with a 2 1⁄2 in. angle valve.
- Class II: Suited for occupants; features 1 1⁄2 in. hose, lengths between 50-150 feet; discharges at 50 GPM and 65 PSI.
- Class III: A combination of Class I and II; has both a 2 1⁄2 in. valve and a 1 1⁄2 in. hose rack.
Testing and Maintenance
- Standpipe systems undergo hydrostatic testing at 200 PSI for 2 hours to detect leaks.
- Dry systems require an air pressure leak test at 40 PSI for 24 hours; a pressure drop of 1.5 PSI indicates leakage.
- Frequency of testing is determined by state and local regulations.
Flow and Water Supply Requirements
- Class I flow test must verify 500 GPM at 100 PSI from the most hydraulically demanding riser.
- Each additional Class I riser requires 250 GPM at 100 PSI.
- Total minimum supply for non-sprinklered Class I buildings is 1250 GPM; for sprinklered buildings, it's 1000 GPM.
- Class II minimum supply is 100 GPM for 30 minutes at 65 PSI.
Types of Standpipe Systems
- Wet Type: Constant water supply and pressure maintained at outlet valves.
- Dry Types:
- First type activates water flow upon valve use.
- Second type uses air pressure; water enters on valve opening.
- Third type has no water supply; relies on fire department delivery.
Installation and Spacing Requirements
- Class III standpipes must ensure every floor section is within 30 feet of a nozzle with up to 100 feet of hose.
- Class II requires a maximum of 20 feet from nozzles attached to 75 feet of hose.
Fire Department Connection (FDC)
- FDCs consist of one or more Siamese connections, required for Class I and III systems.
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