US Navy Magazine Sprinkler Systems
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Questions and Answers

Why are magazine sprinkler systems installed on US Navy ships, considering historical experiences?

  • To mitigate fire risks in magazines and ordnance areas, preventing loss of the ship. (correct)
  • To preemptively flood magazines preventing any possibility of fire.
  • To ensure every ship remains invulnerable to all potential fire hazards.
  • To provide supplemental cooling to munitions, regardless of fire presence.

What are the three fundamental components that constitute a typical magazine sprinkler system?

  • Detection, Actuation, and Sprinkling (correct)
  • Alarm, Valve assembly, and Nozzle
  • Regulation, Distribution, and Suppression
  • Monitoring, Control, and Discharge

Under what condition can a magazine sprinkler system be configured to automatically detect and respond to a fire?

  • If the system is connected to the ship's central fire control computer.
  • If it is configured with a Pneumatically-Released Pilot Valve. (correct)
  • If it is manually tested weekly and certified by a fire safety inspector.
  • If it includes a self-testing diagnostic module that validates its functionality every 24 hours.

What is the standard operational design of a Magazine Sprinkler Valve (MSV) in its non-activated state?

<p>Designed to remain closed until actively triggered to open. (B)</p> Signup and view all the answers

What is the fail-safe design principle of the Magazine Sprinkler Valve (MSV)?

<p>Fails to the closed position to prevent unintentional flooding. (D)</p> Signup and view all the answers

Which function is served by Port A on the Magazine Sprinkler Valve (MSV)?

<p>Connects the operating pressure from the hydraulic control system. (A)</p> Signup and view all the answers

What is the primary observable indication provided by Port B on the Magazine Sprinkler Valve (MSV)?

<p>A visual sign of a ruptured diaphragm. (C)</p> Signup and view all the answers

What is the function achieved by carefully bleeding air from Port C on the Magazine Sprinkler Valve (MSV)?

<p>Relieving valve chatter by removing air from the operating pressure chamber. (B)</p> Signup and view all the answers

What specific maintenance issue can be identified by observing Port D on the Magazine Sprinkler Valve (MSV)?

<p>Presence of damaged or failing o-rings. (B)</p> Signup and view all the answers

What is the intended function of the Three-Way Manual Control Valve within a magazine sprinkler system?

<p>To provide a means to manually activate or secure the magazine sprinkler system. (C)</p> Signup and view all the answers

In the context of the Three-Way Manual Control Valve, what effect does setting the valve to the 'Neutral' position have on the magazine sprinkler system?

<p>Removes operating pressure from control piping, deactivating the system. (D)</p> Signup and view all the answers

What is the function of the Hydraulically Operated Remote Control Valve within the magazine sprinkler system?

<p>Allows the magazine sprinkler control valve to be secured from any manual control station. (B)</p> Signup and view all the answers

What is the function of the Hydraulically Operated Check Valve in a magazine sprinkler system?

<p>Rapidly releases operating pressure, allowing the magazine sprinkler control valve to close quickly and completely. (D)</p> Signup and view all the answers

What critical dimensional standard must be met by all orifice plates used in a magazine sprinkler system?

<p>A hole diameter of 0.098 inch with a tolerance range of +0.002 and -0.000 inches. (D)</p> Signup and view all the answers

What consequence may arise if an orifice plate with a hole diameter larger than 0.102 inch is installed in a magazine sprinkler system?

<p>The system may open slowly or not at all, rendering it ineffective. (A)</p> Signup and view all the answers

What potential problem is associated with using orifice plates that have a hole diameter smaller than specified for a magazine sprinkler system?

<p>Increased risk of the orifice becoming clogged. (C)</p> Signup and view all the answers

Dain lines serve what critical function in a magazine sprinkler system? (Select all that apply)

<p>Dain line 1 – OPEN loop of the operating pressure circuit (C), Dain line 2 – CLOSED loop of the operating pressure circuit (D)</p> Signup and view all the answers

What maintenance concern is indicated by the presence of water in the drain lines of a magazine sprinkler system?

<p>An internal leak of seals or seats, signaling a need for corrective action. (D)</p> Signup and view all the answers

In what type of magazine sprinkler systems is the Pneumatically-Released Pilot Valve (PRPV) typically installed?

<p>Automatically actuated systems that use thermo-pneumatic sensors. (C)</p> Signup and view all the answers

Under what specific condition is it necessary for a Pneumatically-Released Pilot Valve (PRPV) to trip, ensuring proper system functionality?

<p>When a differential pressure of at least 8 ounces per square inch (OSI) is present across the release diaphragm. (B)</p> Signup and view all the answers

During testing of a Pneumatically-Released Pilot Valve (PRPV) system, what minimum pressure and duration must be maintained to validate system integrity?

<p>8 OSI of pressure for at least 5 minutes. (C)</p> Signup and view all the answers

What initial action should be taken if a Pneumatically-Released Pilot Valve (PRPV) fails to operate at its specified pressure threshold?

<p>Retest the PRPV by increasing the pressure to 16-20 OSI and slowly bleeding down to 8-1/2 OSI. (C)</p> Signup and view all the answers

What is the subsequent action to undertake if repeated attempts to operate a Pneumatically-Released Pilot Valve (PRPV) fail at 8-1/2 OSI?

<p>Repeat the test to the next higher 1/2 ounce increment. (D)</p> Signup and view all the answers

What is the maximum permissible pressure that should be applied when testing a Pneumatically-Released Pilot Valve (PRPV)?

<p>10 OSI (C)</p> Signup and view all the answers

When troubleshooting a Pneumatically-Released Pilot Valve (PRPV) system, what action should be taken if all operational checks fail?

<p>Call the inspectors. (D)</p> Signup and view all the answers

What is the primary operational feature that defines a Vented Check Valve in a magazine sprinkler system?

<p>A spring-loaded mechanism that allows flow in only one direction with a vent for pressure equalization. (B)</p> Signup and view all the answers

In what specific part of automatically actuated magazine sprinkler systems are Vented Check Valves installed?

<p>The transmission tubing. (C)</p> Signup and view all the answers

What unique function do the small vents within Vented Check Valves perform in response to normal changes in ambient temperature?

<p>Allows a slow back flow of air to equalize system pressure. (A)</p> Signup and view all the answers

What type of material is specified for the transmission tubing used in magazine sprinkler systems?

<p>1/8 seamless copper tubing with a rockbestos/rockhide covering. (B)</p> Signup and view all the answers

What is the maximum allowable length for transmission tubing between the PRPV manifold and HSD in a magazine sprinkler system?

<p>50 feet, as measured along the tubing. (B)</p> Signup and view all the answers

What specific method is prohibited when extending the length of transmission tubing in a magazine sprinkler system?

<p>Using couplings or brazing. (D)</p> Signup and view all the answers

What angular flare is required when connecting tubing to components within a magazine sprinkler system?

<p>37° (C)</p> Signup and view all the answers

What is the primary functional mechanism of a Heat Sensing Device (HSD) in a magazine sprinkler system?

<p>Releases a spring-loaded bellows, creating a pneumatic signal when actuated. (B)</p> Signup and view all the answers

At what temperature is the fusible link within a Heat Sensing Device (HSD) designed to separate, activating the device?

<p>160°F (+/- 3°) (B)</p> Signup and view all the answers

What is the minimum allowable distance for locating a Heat Sensing Device (HSD) from any supply ventilation terminal or air conditioning unit discharge?

<p>5 feet (B)</p> Signup and view all the answers

What is the functional purpose of the FH (Sprinkling) Alarm in a magazine sprinkler system?

<p>Indicates that the sprinkler system has been actuated or there is leakage past the sprinkler control valve. (A)</p> Signup and view all the answers

How does the FH (Sprinkling) Alarm activate in response to water entry, and where are its key components located?

<p>Through electrical terminals located in the alarm’s well which trip when sea water closes the electrical circuit. (D)</p> Signup and view all the answers

What condition does the FD (Flooding) Alarm indicate in a magazine sprinkler system?

<p>The presence of flooding in the protected compartment. (C)</p> Signup and view all the answers

How is the FD (Flooding) Alarm triggered, and how is it measured?

<p>By a float-type switch that activates when approximately 2 inches of fluid accumulates. (B)</p> Signup and view all the answers

What is the actuation temperature for the F (High Temperature) Alarm?

<p>105°F (A)</p> Signup and view all the answers

Where are the thermostats for the F (High Temperature) Alarm typically installed within a protected compartment?

<p>In the overhead. (D)</p> Signup and view all the answers

What is the maximum area that each thermostat in the F (High Temperature) Alarm system is designed to effectively cover?

<p>250 square feet (B)</p> Signup and view all the answers

Approximately, how many thermostats shall be installed in any magazine compartment to activate the F (High Temperature) Alarm?

<p>No less than two thermostats. (A)</p> Signup and view all the answers

Flashcards

Magazine Springs

Springs used in magazines to reliably feed ammunition into a firearm.

Magazine Sprinkler System

A fire suppression system designed to limit the spread of fire around magazines by wetting down and cooling munitions.

Magazine Sprinkler System

The magazine sprinkler system that floods a magazine regardless of size in no more than one hour.

Magazine Sprinkler Valve (MSV)

A normally closed, globe valve designed to open fully upon actuation in a magazine sprinkler system.

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Magazine Sprinkler Valve (MSV)

This is designed to fail in the closed position.

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MSV Port A

Operating pressure connection; ports water from the hydraulic control system to the operating Pressure Chamber.

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MSV Port B

Atmospheric port located on the side of the Cover that gives visual indication of a ruptured Diaphragm

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MSV Port C

Set screw used to bleed air from the operating pressure chamber, relieving valve chatter.

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MSV Port D

Atmospheric port that gives an indication of bad O-rings.

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Three-Way Manual Control Valve

Valve for manually actuating the magazine sprinkler system.

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Three-Way Manual Control Valve - Neutral

Valve that removes operating pressure from control piping with a neutral position.

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Hydraulically Operated Remote Control Valve

Valve that permits the magazine sprinkler control valve to be secured from any manual control station

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Hydraulically Operated Check Valve

Valve that permits the operating pressure to be rapidly released of pressure thus permitting the magazine sprinkler control valve, to close rapidly and completely.

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Orifice Plates

Components with a 0.098 inch hole (with tolerance) that controls water flow in the system; smaller orifices are subject to frequent clogging.

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Dain Line 1

An open loop of the operating pressure circuit of the Dain Lines.

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Dain Line 2

A closed loop of the operating pressure circuit of the Dain Lines.

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Dain Line 3

System drain of open loop and MSV (Magazine Sprinkler Valve).

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Dain Lines

Valves that show evidence of water, indicating an internal leak of seals or seats, signal the need for corrective action.

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Pneumatically-Released Pilot Valve (PRPV)

Normally closed, spring-loaded pilot valve installed in thermo-pneumatically (automatically) actuated magazine sprinkler systems.

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Pneumatically-Released Pilot Valve (PRPV)

Opens automatically to actuate the sprinkler system in response to a pneumatic signal from one or more thermo-pneumatic sensors

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PRPV Pressure Requirement

A differential pressure of at least 8 ounces per square inch (OSI) across the release diaphragm is necessary to trip PRPV.

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Vented Check Valve

Spring-loaded check valve with a vent feature, installed in transmission tubing of automatically actuated magazine sprinkler systems.

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Transmission Tubing

1/8 seamless copper tubing with a rockbestos/rockhide covering.

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Heat Sensing Device (HSD)

A thin walled, spring-loaded bellows containing air that creates a pneumatic signal when the device is actuated.

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HSD Fusible Link Temperature

Fusible link designed to part when the link temperature reaches 160°F (+/-3°), thus releasing the bellow

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Magazine Sprinkler System Alarms

Alarms and sensors installed to verify system actuation and indicate potential malfunctions.

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Sprinkling (FH Circuit) Alarm

Functions to provide an indication that the sprinkler system has been actuated or that there is leakage past the sprinkler control valve.

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Flooding (FD Circuit) Alarm

Provides an indication that flooding exists in the protected compartment

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High Temperature (F Circuit) Alarm

Will actuate when the space temperature reaches 105°F.

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Study Notes

  • US Navy ships are not immune to fire
  • Fires in magazines or ordnance handling areas can lead to total loss of the ship if not quickly contained

Magazine Sprinkler System Purpose

  • Sprinkler systems limit fire spread around magazines
  • Sprinkler systems work by wetting and cooling munitions/structures, aiding fire extinguishing within the magazine
  • The systems have detection, actuation, and sprinkling sections
  • System effectiveness relies on rapid response and reliable function independent of operation frequency or inactivity

Magazine Sprinkler System Capabilities

  • They can completely flood any size magazine in 1 hour
  • Preemptive actuation to prevent magazine explosion is possible
  • Automatic fire detection and sprinkling is possible when configured with a Pneumatically-Released Pilot Valve

Magazine Sprinkler Valve (MSV)

  • It is a normally closed globe valve
  • It opens fully on actuation
  • The valve is designed to fail closed
  • Sizes up to 8" are available

MSV Four Ports

  • Port A: Operating pressure connection ports water from the control system to the operating pressure chamber
  • Port B: Atmospheric port on the cover provides visual indication of a ruptured diaphragm
  • Port C: Set screw is used to bleed air from the operating pressure chamber to relieve valve chatter, unscrew only until water is observed
  • Port D: Atmospheric port gives a indication of bad o-rings

Three-Way Manual Control Valve

  • It is primarily for manually actuating the magazine sprinkler system
  • Going to OPEN activates the magazine sprinkler system
  • Going to CLOSE secures the magazine sprinkler system
  • Neutral removes operating pressure from control piping

Hydraulically Operated Remote Control Valve

  • Enables the magazine sprinkler control valve to be secured from any manual control station

Hydraulically Operated Check Valve

  • Allows rapid release of operating pressure, enabling the magazine sprinkler control valve to close quickly and completely

Orifice Plates

  • All plates must have a 0.098" hole with a tolerance range of +0.002"/-0.000"
  • A diameter of 0.102" or greater may cause the system to open slowly or not at all, and is a service risk
  • Smaller orifices are subject to frequent clogging

Drain Lines

  • Dain Line 1: OPEN loop of the operating pressure circuit
  • Dain Line 2: CLOSED loop of the operating pressure circuit
  • Dain Line 3: System drain of open loop and MSV
  • Water in drain lines indicates internal seal/seat leaks requiring correction
  • Leaking seats/seals can cause unintentional operation and compartment flooding
  • A system is still usable if the leak is minor, but must be repaired

Pneumatically-Released Pilot Valve (PRPV)

  • It is normally closed, spring-loaded
  • It is installed in automatically actuated magazine sprinkler systems
  • Opens automatically to actuate the sprinkler system when a pneumatic signal is received
  • The signal comes from one or more thermo-pneumatic sensors
  • A differential pressure of at least 8 ounces per square inch (OSI) across the release diaphragm is needed to trip PRPV
  • During testing, the system must maintain 8 OSI of pressure for at least 5 minutes
  • Check the system for leaks if the system fails during testing
  • If PRPV fails at 8 OSI, retest by boosting pressure to 16-20 OSI and slowly bleeding down to 8-1/2 OSI
  • Repeat to next higher 1/2 ounce increment if PRPV fails at 8-1/2 OSI and do not exceed 10 OSI
  • If all attempts fail to operate PRPV, call inspectors

Vented Check Valve

  • Spring-loaded check valve with a vent feature, installed in transmission tubing of automatically actuated sprinkler systems
  • This valve checks against a rapid increase of air pressure in one direction and opens when air pressure is applied in the other
  • It includes a small vent in a bypass around the main valve, allowing slow back flow of air to equalize system pressure with ambient temperature changes

Transmission Tubing

  • Uses 1/8" seamless copper tubing with a rockbestos/rockhide covering
  • Total length of the tubing between the PRPV manifold and HSD should not be more than 50 feet
  • Couplings or brazing are NOT authorized
  • Tubing should be flared to 37° when connecting

Heat Sensing Device (HSD)

  • Consists of thin walled, spring-loaded bellows that contains air
  • It creates a pneumatic signal when actuated
  • Fusible link separates when reaching 160°F (+/-3°), releasing the bellow
  • HSDs should be located away from ventilation or air conditioning discharge by 5ft

Alarms for Sprinkler System

  • Alarms and sensors verify system actuation and indicate potential malfunctions

Magazine Sprinkler System Alarms

  • Sprinkling (FH Circuit) Alarm
  • Flooding (FD Circuit) Alarm
  • High Temperature (F Circuit) Alarm

FH Alarm

  • Provides indication of system actuation or leakage past the sprinkler control valve
  • Water in the alarm well, where two electrical terminals are located, closes the circuit and actuates the alarm

FD Alarm

  • It indicates flooding in the protected compartment
  • A float-type switch at the magazine's low point actuates the alarm when ~2 inches of fluid accumulates, closing an electrical circuit

F Alarm

  • It actuates when the temperature reaches 105°F
  • The thermostat is installed in the overhead of the protected compartment
  • Each thermostat covers up to 250 square feet
  • Minimum of two thermostats per compartment

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Description

Sprinkler systems limit fire spread around magazines on US Navy ships. They wet and cool munitions/structures, aiding fire extinguishing. The systems are designed for rapid response and reliable function, and can completely flood any size magazine in 1 hour.

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