Stand Pipe Systems Flashcards

Questions and Answers

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?

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?

NFPA 14

What is a Class 2 standpipe?

The Class II system is usually equipped with 1 1/2 in. (65 mm) hose in varying lengths, used by building occupants until the fire department arrives. Signup and view all the answers

How long can the hose be in Class 2 standpipes?

50-150 feet Signup and view all the answers

How many GPM's and at which PSI do Class 2 standpipes discharge at?

50 GPM at 65 PSI Signup and view all the answers

What is a Class 3 standpipe?

A combination of Class I and Class II, usually equipped with a 2 1/2 in. (65 mm) angle valve for fire department use and a 1 1/2 in. (40 mm) hose rack assembly for industrial fire brigade use. Signup and view all the answers

How is a standpipe system tested?

A hydrostatic test is performed by pressurizing the piping to 200 PSI for 2 hours to check for leaks. Signup and view all the answers

How are dry systems tested?

An air pressure leakage test at 40 PSI for 24 hours must be conducted. Signup and view all the answers

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?

Flowing 500 GPM at 100 PSI at the most hydraulically demanding riser. Signup and view all the answers

What is the minimum GPM and PSI for every additional riser in a building with a Class 1 standpipe?

250 GPM at 100 PSI for each additional riser. Signup and view all the answers

What should be the minimum total GPM of all Class 1 standpipes flowing simultaneously in a building that is not completely sprinklered?

1250 GPM Signup and view all the answers

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?

1000 GPM Signup and view all the answers

What NFPA standard covers sprinkler systems?

NFPA 13 Signup and view all the answers

How many different classes of standpipes are there?

3 Signup and view all the answers

How many different types of standpipes are there?

4 types (1 wet and 3 dry) Signup and view all the answers

Describe the 'wet type' of standpipe system.

Standpipe system having a supply valve open and water pressure maintained at all times to the outlet valves. Signup and view all the answers

Describe the 1st 'dry' type of standpipe.

Normally empty, the system is charged automatically when an electrical switch or other device located at each outlet is activated. Signup and view all the answers

Describe the 2nd 'dry' type of standpipe.

Normally empty; the system is charged with air pressure. Water enters the system when an outlet valve is opened. Signup and view all the answers

Describe the 3rd 'dry' type of standpipe.

Normally empty; the system has no permanent water supply. Water is supplied by fire department pumper. Signup and view all the answers

On the 3rd type of dry standpipe, how do some systems help reduce filling time by the engine?

Primed system - a dry type (no permanent water supply), but kept full of water to reduce filling time by a pumper. Signup and view all the answers

How far apart should Class 3 standpipes be spaced out in a building?

All portions of each floor are to be within 30' of a nozzle attached to no more than 100' of fire hose. Signup and view all the answers

How far apart should Class 2 standpipes be spaced out in a building?

All portions of each floor are to be within 20' of a nozzle attached to no more than 75' of fire hose. Signup and view all the answers

What is the minimum water supply for a Class 1 standpipe?

500 GPM for 30 min., maintain 65 PSI at the topmost outlet with 500 GPM flowing. Signup and view all the answers

What is the minimum water supply for a Class 2 standpipe?

100 GPM for 30 min., maintain 65 PSI at the topmost outlet with 100 GPM flowing. Signup and view all the answers

What is the minimum water supply for a Class 3 standpipe?

Same as Class 1 Signup and view all the answers

What is an FDC and how many are required for Class 1 and 3 standpipes?

FDC - Fire Department Connection; one or more Siamese connections are required. Signup and view all the answers

How often should a standpipe be tested and maintained?

Outside agencies usually test and maintain systems, with frequency requirements set by state and local governments. Signup and view all the answers

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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Description

This quiz focuses on the essential concepts of standpipe systems used in firefighting. Understand the purpose, classifications, and standards related to these systems, particularly the NFPA regulations. Ideal for fire safety professionals or students studying fire protection measures.