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Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020...

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Sprinkler Pipe Corrosion in Wet, Dry and Preaction Fire Protection Systems Presented by: Scott Bodemann, Product Manager South‐Tek Systems 2940 Orville Wright Way Wilmington, NC 28405
Transcript
Page 1: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Sprinkler Pipe Corrosionin Wet, Dry and Preaction Fire Protection Systems

Presented by:Scott Bodemann, Product Manager

South‐Tek Systems2940 Orville Wright WayWilmington, NC 28405

Page 2: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3
Page 3: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Corrosion Leads to Catastrophic/Pinhole Leaks

Property/Equipment damage

Costly ongoing repairs; pipe and/or system replacement

Renders Fire Protection System (FPS) inoperable in event of fire

Sprinkler head blockage

Deteriorates system components such as gaskets and seals

Page 4: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Corrosion Occurs in Galvanized & Black Steel

• Unprotected Metal (A)• Uniform wall thinning corrosion mechanism in Black Steel

• Localized pitting corrosion mechanism in Galvanized

• Electrochemical Potential (B)• Inexhaustible source of Oxygen in compressed supervisory air

• Electrolyte (C)• Residual water and moisture left behind after hydrotest

A + B + C = Corrosion

Corrosion Triangle

B. Electrochemical Potential (Oxygen)

C. Electrolyte (Moisture)

A. Unprotected Metal

Nitrogen eliminates the Electrochemical potential (B), therefore the equation is not complete and Corrosion is Inhibited.

Page 5: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Wall thickness

As‐received

Cleaned

Courtesy of: CorrConsult

Example: Galvanic Corrosion

Page 6: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3
Page 7: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Nitrogen vs. Air

Ongoing, long term exposure tests conducted to compare the performance of Nitrogen vs. air

Sections of Schedule 10 Black Steel and Galvanized Pipe

Individually subjected to compressed air and supervisory Nitrogen

Measure the corrosion rates and extrapolate

Sufficient data collected to project significant pipe service life extension as a result of Nitrogen supervision

Page 8: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

BLACK STEEL36‐MonthTest Results 

Compressed Air

16.4 Years Pipe Service Life

95% Nitrogen 

20.3 Years Pipe Service Life

98% Nitrogen 

48 Years Pipe Service Life

As Received Cleaned

Page 9: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

GALVANIZED STEEL36‐MonthTest Results 

Compressed Air

7.1 Years Pipe Service Life

95% Nitrogen 

10.4Years Pipe Service Life

98% Nitrogen 

92 Years Pipe Service Life

As Received Cleaned

Page 10: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Pipe Material Supervisory

Gas

Exposure time

(Days)

Uniform wall loss or Pit

depth (inches)

Penetration Rate

(mils/yr)

AveragePenetration

Rate (mils/yr)

497 0.009 6.6 Black steel Compressed Air 759 0.022 10.6 7.3

780 0.017 8.0 1116 0.015 3.9 497 0.008 5.9

Black steel 95% Nitrogen 759 0.012 5.8 5.9 780 0.016 7.5 1116 0.013 4.3 497 0.004 2.9

Black steel 98% Nitrogen 759 0.003 1.4 2.5 780 0.007 3.3 1116 0.007 2.3 497 0.028 20.6

Galvanized steel Compressed Air 759 0.034 16.4 17.5 780 0.036 16.9 1116 0.050 16.4 497 0.003 2.2

Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001

Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3 780 0.007 3.3 1116 0.002 0.7

RESULTS36‐MonthTest  

Page 11: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Sprinkler Pipe Testing Conclusions

• Potential extension of black steel pipe service life from 16 to 48 years 

• Potential extension of galvanized steel service life from 7 to 92 years

• Significant cost savings can be realized by using black steel pipe in combination with Nitrogen supervision instead of galvanized steel pipe.

As a result of 98% Nitrogen 

supervision instead of compressed 

air supervision

Page 12: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3
Page 13: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Ice Plugs

Accumulation of condensation leads to ice plugs

Compressed air exits the air compressor between 180◦ and 250◦F

Warm air cools too quickly and moisture develops on the low temperature piping

Even with regenerative dryer, moisture collects whenever dew point is greater than pipe temperature

Nitrogen is an inert gas with a true ‐40◦to ‐70◦F dew point

Per FM Global, “It is recommended that a dew point 20◦F lower than the freezer temperature be chosen.” Photos courtesy of FM Global

Page 14: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3
Page 15: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Membrane Technology

Used to generate Non‐cryogenic (gaseous) Nitrogen on‐site

A polymeric hollow fiber permeates oxygen, water vapor, and impurities out of side walls, allowing Nitrogen to flow through its center

10 – 15+ year lifespan (when properly designed and maintained)

Requires a minimum of 125 PSI of clean, dry compressed air

NitrogenOxygenWater Vapor

Page 16: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

PSA Technology

Cost effective for larger applications

For applications requiring up to 99.995% Nitrogen purity

Carbon Molecular Sieve (CMS) adsorbs Oxygen and all other molecules under high pressure, allowing Nitrogen to pass through

20 – 25 year lifespan (when properly designed and maintained)

Sieve Bed Pressure Vessels 

Filled with Carbon 

Molecular Sieve

Vessels are filled with Carbon Molecular Sieve (CMS)

Under high pressure, CMS adsorbs impurities, allowing Nitrogen to pass through and into the Storage Tank

Once the CMS is saturated, the vessel is vented to atmosphere and impurities are released from the CMS

The CMS is now ready for the next N2 generating cycle

Page 17: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Type 1 Nitrogen GeneratorInstallation Layout

Note:  Figures Not Drawn to Scale

Air CompressorAir Compressor

Nitrogen GeneratorNitrogen Generator

Compressed AirBypass Line

Compressed AirBypass Line

Nitrogen Supply line out to 

Air Maintenance Devices (AMDs)

Nitrogen Supply line out to 

Air Maintenance Devices (AMDs)

Page 18: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Nitrogen Supply line out to 

Air Maintenance Devices (AMDs)

Nitrogen Supply line out to 

Air Maintenance Devices (AMDs)

Note:  Figures Not Drawn to Scale

Air CompressorAir Compressor

Refrigerated Air Dryer

Nitrogen GeneratorNitrogen Generator

Compressed AirBypass Line

Compressed AirBypass Line

Type 2 Nitrogen Generator Install Layout

Page 19: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Type 3Nitrogen GeneratorInstallation Layout

Note:  Figures Not Drawn to Scale

Nitrogen Supply line out to 

Air Maintenance Devices (AMDs)

Nitrogen Supply line out to 

Air Maintenance Devices (AMDs)

Air CompressorAir CompressorRefrigerated Air Dryer

Nitrogen GeneratorNitrogen Generator

Compressed AirBypass Line

Compressed AirBypass Line

Page 20: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

NEW  N2‐Blast® INTEGRATED CORROSION INHIBITING SYSTEM for 

FIRE PROTECTION SYSTEMS

TOTALPAC®3TOTALPAC®3

Page 21: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

NEW  N2‐Blast® INTEGRATED CORROSION INHIBITING SYSTEM for 

FIRE PROTECTION SYSTEMS

TOTALPAC®3TOTALPAC®3

N2-Blast® Option Components

A: Dry or preaction automatic sprinkler systemB: Air Style “A” Direct air compressor (shown) or Style”B” APMD availableC: Nitrogen generatorD: Nitrogen storage tank (28 gallons)E: Maintenance Air Compressor - Maintains storage tank pressure

N2-Blast® Option Specifications

Page 22: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Building Monitoring System Integration

Alarms if Nitrogen Generator is bypassed by air compressor or inadvertently powered “off”

Ensures that Nitrogen, not air, is continually flowing to the Air Maintenance Device/s

Built internal to the Nitrogen Generator and provides both a visual and audible alarm

Includes a dry contact to wire into the Building Monitoring System

Air Bypass AlarmLeak Detection System

•Should be provided with every Nitrogen generator

•Alarms when the Nitrogen Generator senses a significant leak in FPS piping, which causes the equipment to run excessively

•Alarms if the equipment is not working properly

•Built within the Nitrogen Generator cabinet and includes dry contact for signal out to Building Monitoring System

Page 23: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

AutoPurgeSystem

In order to effectively inhibit corrosion, high purity Nitrogen must be equally distributed throughout the entire FPS

• Provides a constant purge of Nitrogen within each FPS Zone

• Assists in drying out residual water and moisture left behind after hydrotest

• Proven through Computational Fluid Dynamics Modeling to be the most effective way to ensure high purity Nitrogen reaches all branches within the FPS

(1) to be installed on each Zone / System

Install on remote section of FPS

Easily tuned on site by the Sprinkler Contractor

Pneumatic, no power required

Page 24: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

AutoPurgeSystem Install

Page 25: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Tuning the AutoPurgeSystem

Page 26: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Nitrogen Supply line out to 

Air Maintenance Devices (AMDs)

Nitrogen Supply line out to 

Air Maintenance Devices (AMDs)

Note:  Figures Not Drawn to Scale

Air CompressorAir Compressor

Refrigerated Air Dryer

Nitrogen GeneratorNitrogen Generator

Initial  fill  with  Compressed  Air

Open the Compressed AirBypass Line

Open the Compressed AirBypass Line

Page 27: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

System fill with compressed air

AutoPurgeSystem™

Page 28: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

System fill with compressed air

AutoPurgeSystem™

Page 29: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

System fill with compressed air

AutoPurgeSystem™

Page 30: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

System fill with compressed air

AutoPurgeSystem™

Page 31: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

System fill with compressed air

AutoPurgeSystem™

Page 32: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

System fill with compressed air

AutoPurgeSystem™

Page 33: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

System fill with compressed air

AutoPurgeSystem™

Page 34: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

System fill with compressed air

AutoPurgeSystem™

Page 35: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

System fill with compressed air

AutoPurgeSystem™

Page 36: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Nitrogen Supply line out to 

Air Maintenance Devices (AMDs)

Nitrogen Supply line out to 

Air Maintenance Devices (AMDs)

Note:  Figures Not Drawn to Scale

Air CompressorAir Compressor

Refrigerated Air Dryer

Nitrogen GeneratorNitrogen Generator

Close the Compressed AirBypass Line

Close the Compressed AirBypass Line

Introducing  98%+ Nitrogen

Page 37: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

Purge compressed air with Nitrogen

AutoPurgeSystem™

Page 38: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

Purge compressed air with Nitrogen

AutoPurgeSystem™

Page 39: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

Purge compressed air with Nitrogen

AutoPurgeSystem™

Page 40: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

Purge compressed air with Nitrogen

AutoPurgeSystem™

Page 41: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

Purge compressed air with Nitrogen

AutoPurgeSystem™

Page 42: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

Purge compressed air with Nitrogen

AutoPurgeSystem™

Page 43: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

Purge compressed air with Nitrogen

AutoPurgeSystem™

Page 44: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

Purge compressed air with Nitrogen

AutoPurgeSystem™

Page 45: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

Purge compressed air with Nitrogen

AutoPurgeSystem™

Page 46: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

Purge compressed air with Nitrogen

AutoPurgeSystem™

Page 47: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

Purge compressed air with Nitrogen

AutoPurgeSystem™

Page 48: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

Purge compressed air with Nitrogen

AutoPurgeSystem™

Page 49: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Dry or Preaction Riser

Purge compressed air with Nitrogen

AutoPurgeSystem™

Page 50: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Portable Nitrogen Purity Sensor

Designed for Building Management Personnel to periodically obtain a quick, visual display of the Oxygen content within the system

• Ensures that the inner walls of the Sprinkler Piping are blanketed with 98%+ pure Nitrogen

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Nitrogen Monitoring Manifold

Provides the Building Manager with a true indication of the Nitrogen purity content within each FPS and ultimately minimizes power consumption

• LCD screen tracks the Nitrogen purity content within each specific Zone  

• Samples the Nitrogen purity  at  remote points within the FPS

• Stops the purging process once Nitrogen purity has been achieved

• Limits the runtime of the Air Compressor and Nitrogen Generator

• 110V/60Hz/1Ph, 8 amp power required

Page 52: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Preventative Maintenance

Annually

• Air Compressor • Change lubricant, air filters and oil filter

• Nitrogen Generator & Related Accessories• Change all (3) filters

• Rinse the inside of each filter bowl• Hour meter should be less than 1000 hrs/year

• Wipe down all surfaces

Quarterly

• Air Compressor • Check belt, wipe down surfaces, and inspect oil level

• Nitrogen Generator & Related Accessories• Clean strainer on each AutoPurge System

• Check that 98% or greater Nitrogen purity content is being maintained within each Zone

• Monitor  runtime  (should be less than 3 hours per day)

• Wipe down all surfaces

Page 53: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3
Page 54: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3
Page 55: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3
Page 56: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3
Page 57: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Wet System Corrosion Oxygen exists within Water

• Water is continuously being maintained within  the steel piping.

• That water contains ~ 10 parts per million (ppm) of dissolved oxygen.  Therefore each wet system will experience  initial corrosion because of dissolved oxygen . 

• However, this can become self‐limiting in the sense that all of the dissolved oxygen will be consumed and will cease until the system is refilled with fresh, oxygenated water.  

• Reduction of the dissolved oxygen in water to a level below 0.3ppm will result in inhibiting corrosion of the steel that is in contact with water.

Page 58: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Wet System Corrosion Oxygen exists within Air Pockets

• Trapped air pockets frequently exist within Wet systems

• These trapped air pockets contain 20.9% Oxygen and therefore electrochemical corrosion is fully sustained

• As a result, pin hole leaks eventually develop at the location of the air‐water interface 

• Reduction of the 20.9% oxygen to a level below 2% will inhibit corrosion in the steel surrounding the trapped air pocket.

• However, the oxygen concentration of the water surrounding the trapped air pocket must also be reduced. 

Page 59: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Wet System Corrosion 

Page 60: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

Mitigating Wet Sprinkler Pipe Corrosion

•By pre‐pre‐purging the system with Nitrogen, the pockets of trapped air will now be pockets of trapped nitrogen gas, no longer containing harmful Oxygen

• Then by charging the sprinkler pipe with DeOx™ ‐Deoxygenated Water, less than 0.1ppm of dissolved oxygen (under the Oxygen limits known to cause corrosion) remains in constant contact with the steel sprinkler piping.

• There isn’t enough Oxygen in the water to dissipate into the trapped nitrogen gas pockets, hence protecting the piping area where in the past, corroded.

• In conclusion, by eliminating the trapped air pockets and removing all but .1ppm of dissolved oxygen from within the sprinkler piping, the overall threat of corrosion is eliminated.  

How?  Pre‐purge with a N2 gas and  charge the sprinkler system with DeOx™ ‐Deoxygenated Water

• Objective # 1• Reduce the dissolved oxygen in water to a level below 0.3ppm

• Objective # 2• Remove the Oxygen from within the trapped air pockets

In order to slow down or completely eliminate internal wet system corrosion, the following must be accomplished

Page 61: Sprinkler Pipe Corrosion497 0.003 2.2 Galvanized steel 95% Nitrogen 759 0.040 19.2 11.5 780 0.020 9.1 1116 0.047 15.4 497 0.001 0.001 Galvanized steel 98% Nitrogen 759 0.003 1.4 1.3

South‐Tek Systems

• 2940 Orville Wright Way   Wilmington, NC  28405

• t: (888) 526.6284• f: (910) 332.4178• e: [email protected]• w: www.southteksystems.com

South‐Tek Systems•Product/ Account Manager:• Scott Bodemann• c: 484.574.6067• [email protected]

•Sales/ Technical Support:• Jimmy O’Connor• c: 910.338.8092• [email protected]

•Molly Hollifield• 910.332.4173 ext. 112•[email protected]

•Service/ Warranty Support:  •Kevin Mueschen• o: 910.332.4173 ext. 125

Key Contacts:


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