Summary of Contents for DREXAN HeatTracer
- Page 1 Fire Sprinkler Freeze Protection Design / Install Guide Page 1 of 23 HD110301-1 Rev2...
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Page 2: Table Of Contents
Fire Sprinkler System Freeze Protection Design / Install Guide CONTENTS HAZARDOUS LOCATIONS Introduction Page 3 System Overview Page 4 Fire Suppression System Freeze Protection Applications Page 5 Typical Pipe Freeze Protection System Page 5 Fire Supply Lines Page 6 Sprinkler Standpipes Page 8 Branch Lines with Sprinklers Page 9... -
Page 3: Introduction
INTRODUCTION This design guide and installation manual from Drexan HeatTracer provides recommendations for designing a pipe freeze protection system for fire sprinkler piping, using Drexan HeatTracer MultiTrace cables. It provides system design and performance data, information on heat tracing monitoring and control, electrical sizing information, and various configuration recommendations. -
Page 4: System Overview
Tools necessary for a complete installation and commissioning tests Approvals Drexan HeatTracer MultiTrace is CSA / UL (CUS) certified for use on fire suppression systems in North America. The system covered in this manual includes supply lines, stand pipes, branch lines and sprinkler heads. -
Page 5: Fire Suppression System Freeze Protection Applications
FIRE SUPPRESSION SYSTEM FREEZE PROTECTION APPLICATIONS Properly designed freeze protection systems maintain water temperature at a minimum of 40°F/4°C to prevent fire suppression piping from freezing. Fire Suppression System Freeze Protection Applications A typical freeze protection system includes the heating cables, connection kits, cable monitoring and temperature control, and power distribution. -
Page 6: Fire Supply Lines
FIG. 2 – ABOVE GROUND SUPPLY PIPING Application Requirements The system complies with Drexan HeatTracer design and installation requirements for above ground general water piping given the following conditions are met: Heating cable is permanently secured to insulated metal pipes using TAPE-GCR-HT glass tape or to plastic pipes using TAPE-AL aluminum tape ... - Page 7 The line is buried at least 2 feet/0.7 m deep All heating cable connections are made above ground The power connection and end seal connections are made above grade in Drexan HeatTracer connection kits Heating cable is protected from the pipe to the power connection box in CSA certified water- sealed conduit with a minimum diameter of ¾”...
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Page 8: Sprinkler Standpipes
FIG. 4 – STANDARD SPRINKLER STANDPIPE – Heating System Layout Application Requirements The system complies with Drexan HeatTracer design and installation requirements for freeze protection of sprinkler system piping given the following conditions are met: Schedule 5, 10, 20 or 40 steel sprinkler standpipe up to and including 20” diameter is used ... -
Page 9: Branch Lines With Sprinklers
FIG. 5 – TYPICAL FIRE SUPPRESSION SYSTEM FOR BRANCH LINES WITH SPRINKLERS Application Requirements The system complies with Drexan HeatTracer design and installation requirements for freeze protection of fire suppression branch lines with sprinklers given the following conditions are met: ... -
Page 10: Freezer Applications
FIG. 6 – TYPICAL FIRE SUPPRESSION SYSTEM FOR FREEZER APPLICATIONS Application Requirements The system complies with Drexan HeatTracer design and installation requirements for fire suppression systems for freezer applications given the following conditions are met: The heating cable is permanently secured to insulated metal pipes using TAPE-GCR-HT glass tape or to plastic pipes using TAPE-AL aluminum tape ... -
Page 11: Fire Suppression System Freeze Protection Design Guide
This section provides step-by-step instructions to design a fire suppression freeze protection system. While the steps shown here allow for manual design, Drexan HeatTracer recommends the use of the ProTrace Design Software to provide a compliant design complete with estimates of power loads and detailed bills of material for the project. -
Page 12: Step 2 - Design Considerations
STEP 2 – DESIGN CONSIDERATIONS When a pipe enters the heated area of a building it is important that the cable extends into the building approximately 12” to ensure the pipe temperature is maintained above freezing. When a pipe enters the ground to below the frost line it is important to run the cable well below the frost line (a minimum of 2 feet) to ensure the pipe temperature is maintained above freezing. -
Page 13: Step 3 - Electrical Requirements
Note: The charts used in this guide are based on Glass Fiber Thermal Insulation. These charts may also be used with polyisocyanurate and Mineral Wool insulations of the same thickness. Note: refer to the MultiTrace cable data sheet located on the Drexan HeatTracer Website: www.drexan.com/... - Page 14 Table 1 WATTS PER FOOT PIPE REQUIRED Pipe Dia. Ambient Temp. Insulation Thickness Inch °F °C ½" 1" 1 ½" 2" 2 ½" 3" 4" ½ ¾ 1 ¼ 1 ½ 2 ½ 10.0 11.9 11.3 14.9 Page 14 of 23 HD110301-1 Rev2...
- Page 15 Table 1 cont. WATTS PER FOOT PIPE REQUIRED Pipe Dia. Ambient Temp. Insulation Thickness Inch °F °C ½" 1" 1 ½" 2" 2 ½" 3" 4" 11.0 13.5 16.0 21.1 11.6 14.0 17.2 20.5 11.0 27.0 14.6 10.3 17.0 21.0 11.4 26.0 13.6...
- Page 16 The following Table 2 shows the amount of extra cable required to heat trace pipe hardware such as valves and supports. Allow an extra 4 feet of cable per cable circuit run for the power and end seal terminations. Example: 3 feet for the power termination and 1 foot for the end termination. Table 2 HEAT LOSS ADDERS (CABLE PER FOOT) Pipe Hardware Types...
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Page 17: Step 5 - Cable Components
A typical heat tracing system will include cable, cable components and controls, as required. Drexan offers 3 families of connection components. For most installations, AMIGA components are recommended as they can connect up to three heaters to power or be used as an inline splice (no power) or inline tee (no power). -
Page 18: Step 6 - Power Distribution
STEP 6 – POWER DISTRIBUTION Power to the heating cables can be provided directly or through external contactors. For large jobs where power distribution panels are desired, contact Drexan HeatTracer for design and delivery. Single circuit control: Heating cable circuits that do not exceed the current rating of the selected Controllers can be switched directly. -
Page 19: Installing Self-Regulating Cable
INSTALLING SELF REGULATING CABLE Install heating cable on the bottom half of the pipe between 4 & 8 o’clock. Install cable straight along the pipe. In some instances, it may be necessary to install more than one run or spiral the cable around the pipe. Example: pipe heat loss requires 12 W/ft., cable output is 8 W/ft., therefore apply 1.5 feet cable per foot of pipe. - Page 20 FIG. 7 Page 20 of 23 HD110301-1 Rev2...
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Page 21: Testing Self-Regulating Cable
TESTING SELF-REGULATING CABLE A test should be performed when the heating cable is received, prior to installation and after installation using a 500 VDC megger. Note: Do not use a megger in excess of 2500 VCD. Detecting cable damage prior to the application of insulation can prevent additional labor costs. Minimum readings of 20 Megohms for each circuit is an acceptable level to test for. -
Page 22: Heating Cable Test Report
HEATING CABLE TESTING REPORT Customer ___________________________ Contractor Phone No. __________________________ Phone No. Site Location ________________________ Project Ref. Readings Prior to Installation: Cable Reference No. __________________ Heater Length Insulation Resistance (M Ohms) __________________ Tested By ___________________________ Date Witnessed By ________________________ Date Readings after Installation: Insulation Resistance (M Ohms) ______________________________________ Tested By ___________________________ Date... -
Page 23: Troubleshooting Self-Regulating Cable
Thermostat setting is incorrect Adjust thermostat to correct setting. Incorrectly designed. Revisit the design conditions and criteria FOR HEATTRACER TECHNICAL ASSISTANCE CALL 1-800-663-6873 (NORTH AMERICA ONLY) OR +1.780.413.1774 Page 23 of 23 HD110301-1 Rev2...
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