Prevent Ice Plugs with the FM Approved Dry Air Pac for Freezer Room Fire Protection

The Leading Manufacturer of Air Compressors The Leading Manufacturer of Air Compressors Designed for All Types of Dry Pipe Sprinkler SystemsDesigned for All Types of Dry Pipe Sprinkler Systems

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Dry Air Pac For Critical Applications

•Basics of Compressed Air

•Ice Plugs

•Primary Components

•A Closer Look At The Integrated Control Panel

•Inside the Control Panel

•Troubleshooting


Basics of Compressed Air


Air Compressors

Compressed Air: Atmospheric air compressed by a mechanical device to increase its pressure.

• Compressed air is an energy source – often considered the 4th utility.

Moisture

Dewpoint: Temperature at which moisture will occur.

• Example: 75ºF, 75 RH, 25 CFM = 4.5 gallons of water per day

Air Dryers

• Refrigerated, 30ºF – 39ºF dewpoint

• Chemical, down to -100ºF dewpoint


Compression Ratio

It takes 7.8 Ft3 of atmospheric air (14.69 PSIA) to make one actual cubic foot of air at 100 psig. (psia / atmosphere)


Compression Ratio


Ice Plugs

The Problem - Ice Plugs

• Ice Plug formation causes partial and eventually complete blockage of the dry-pipe system.

•Factory Mutual, after several years of study, found that 50% to 70% of the dry pipe systems inspected were plagued with Ice Plug problems.

The Cause - Ice Plugs

• Evaporating Priming Water

• Water left in the lines after annual trip test.

• The Major Culprit, moisture laden compressed air meeting freezing temperatures in the Dry Pipe System.

(Contrary to popular belief, using air from the freezer room for the dry pipe systemWill not solve the ice plug problem)


The Solution …

• Freezer Rooms

• Cold Storage

• Parking Garages

• Potential MIC Effected Areas

• Anywhere Dry Air is Essential


Primary Components

FM Approval eliminates requirement to connect air intake to freezer room.

Industrial Duty Compressor Pump

Removable Intake Filter with Weatherhood

Compact Air Cooled Aftercooler

Pressure Switch

Check Valve

ASME / NB Tank (30 Gallons)

Integrated Electronic Drain

Vibration Isolation Pads

Prefilter with Differential Pressure Gauge

SAEJ10 Towers

Purge Pressure Gauge

Oversized Mufflers for quiet discharges and low backpressure

UL Listed / FM Approved Air Maintenance Device

Combination Afterfilter & Regulator

Dry Air Outlet

Dewpoint Test Port

Dry Air Pac Test Kit

gives visual indication if moisture is present (Available as option).

Fully Integrated Control Panel ensures package performs to specification.

A Closer Look at the Fully Integrated Control

Panel

Fully Integrated Control Panel – Performance Lights

Fully Integrated Control Panel –

•Reset Button

•Control Panel Power

•Incorporated Automatic Drain Controls

Fully Integrated Control Panel – Hour Meter

Fully Integrated Control Panel – Receiver Pressure Gauge

Fully Integrated Control Panel – Left Tower Pressure Gauge

Fully Integrated Control Panel – Right Tower Pressure Gauge

Fully Integrated Control Panel – Outlet Pressure Gauge

Inside the Control Panel

Inside the Control Panel – Magnetic Line Starter (NEMA Rated)

Inside the Control Panel – Control Circuit Transformer (with primary and secondary fusing)

Inside the Control Panel – Cam Timer

Inside the Control Panel – Solenoid Valves


Troubleshooting

Troubleshooting the Dry Air Pac

Problem

Poor Dewpoint Performance

Probable Cause

Low pressure on desiccant dryer

Excessive water or oil in dryer

Low purge flow

Desiccant contamination

High inlet temp. to dryer

Solution

Reset Pressure Switch .

Check coalescing filter & automatic drain operation

Check purge pressure setting

Check the date of the last desiccant change. Recommended change every 1 to 2 years

Clean aftercooler


Problem

Excessive Pressure Drop

Probable Cause

Switching valve failure . .

Desiccant breakdown

Clogged filters

Solution

Check tower-operating sequence to verify and identify which valves are operating.

Change desiccant

Change filter elements


Problem

Switchover Failure

Probable Cause

Electric power loss . .

Solenoid valve failure

Solution

Turn dryer off; check connections to cam timer and inlet to unit.

Check valve operative sequence. Replace valve.


Problem

Repressurization Failure or Purge Failure

Probable Cause

Purge flow control valve orifice clogged.

Failed check valve.

Purge exhaust solenoid valve failure.

Purge exhaust muffler clogged.

Solution

Clean or replace. .

Replace.

Turn dryer off, check connections to cam timer, inspect valve and solenoid, replace if necessary. .

Clean or replace.


Call Toll Free

1-800-345-8207Or visit our web site

www.GeneralAirProducts.com

Prevent Ice Plugs with the FM Approved Dry Air Pac for Freezer Room Fire Protection

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Transcript of Prevent Ice Plugs with the FM Approved Dry Air Pac for Freezer Room Fire Protection