DREXAN HeatTracer Manuale utente
HD110301-1 Rev2
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Fire Sprinkler Freeze Protection
Design / Install Guide
HD110301-1 Rev2
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CONTENTS
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
Freezer Applications Page 10
Fire Suppression System Freeze Protection Design Guide Page 11
STEP 1 –Collect the Required Information for Each Line Page 11
STEP 2 –Design Considerations Page 12
STEP 3 –Electrical Requirements Page 13
STEP 4 –Selecting Cable Power Output Page 13
STEP 5 –Cable Components Page 17
STEP 6 –Power Distribution Page 18
Installing Self-Regulating Cable Page 19
Testing Self-Regulating Cable Page 21
Heating Cable Test Report Page 22
Troubleshooting Self-Regulating Cable Page 23
Fire Sprinkler System Freeze Protection
Design / Install Guide
HAZARDOUS LOCATIONS
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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
MultiTracecables. It provides system design and performance data, information on heat tracing
monitoring and control, electrical sizing information, and various configuration recommendations.
This design guide assumes the fire protection system has been designed by others qualified in the
art.
MultiTrace is certified to all CSA / UL (CUS) standards for use throughout North America, as well as
ATEX 2014/34/EU for global applications and is suitable for both metal and non-metal pipes, tanks
and vessels. (see p.17).
This guide does not cover the following applications:
•Hazardous locations as defined in the National / Canadian Electric Code
•Supply voltages other than 100-130V or 208-277V
For assistance with application requirements that differ from those addressed in this document,
contact your Drexan representative or Drexan directly at 1-800-663-6873.
The following instructions will provide you with a step-by-step procedure for determining the best
solution for your fire sprinkler system freeze protection applications. An improperly designed and
installed heat tracing system could result in cable failure and possible physical injury.
The installation manual provides general guidance for installing the heating cable and components
on fire sprinkler piping. Additional installation instructions are included with the connection kits,
controllers, and accessories. If you are missing any required documents, you can download them
from the on-line document library at www.drexan.com.
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SYSTEM OVERVIEW
Drexan HeatTracer MultiTrace self-regulating cable is designed for freeze protection of above
ground and buried supply pipes, fire standpipes, branch lines and branch lines containing sprinklers
when run in areas potentially exposed to freezing temperatures.
Drexan offers 4 MultiTrace nominal cable power output options for fire sprinkler systems: 3W, 5W,
8W and 10W per foot
1
for applications using 100-130V and 208-277V power. Selection of the
correct power output for a given line size will ensure sprinkler systems do not overheat and that
electrical energy is efficiently used, while providing the required, reliable freeze protection.
A correctly designed and specified system will comprise the following:
Heating cable correctly selected for the line size at design minimum ambient temperatures
Power connections, tees and end seals based on piping configuration
Monitoring and control system
Power distribution panels complete with appropriate ground fault equipment protection
Accessories including attachment tapes and warning labels
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.
1
at 50 degrees F
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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.
FIG. 1 –TYPICAL FIRE / FREEZE PROTECTION SYSTEM
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Fire Supply Lines
MultiTrace is designed to maintain fire supply lines at 40°F/4°C in areas subject to freezing.
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
The system is controlled by a Controller with integrated ground fault protection with alarm
contacts connected to a fire control panel
Heating cable is installed per manufacturer’s instructions with approved connection kits.
Approvals
CSA / UL (CUS) certified for non-hazardous locations.
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FIG. 3 –TYPICAL BURIED PIPING SYSTEM
Application Requirements
The system complies with Drexan HeatTracer design and installation requirements for buried piping
given the following conditions are met:
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” suitable for the location
The system is controlled by a Controller with integrated ground fault protection with alarm
contacts connected to a fire control panel
Closed cell waterproof thermal insulation with fire retardant waterproof covering approved
for direct burial is used over the cable and pipe
Heating cable is installed per manufacturer’s instructions with approved connection kits
Approvals
CSA / UL (CUS) certified for non-hazardous locations.
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Sprinkler Standpipes
MultiTrace is designed to maintain fire suppression system standpipes at 40°F/4°C in areas subject
to freezing.
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
UL listed fiberglass or closed cell flame-retardant insulation with weatherproof cladding is
used
The system is controlled by a Controller with integrated ground fault protection with alarm
contacts connected to a fire control panel
Control valve may be traced but requires removable insulation to allow inspection, and
requires a dedicated controller with RTD mounted on valve body and alarm contact for low
temperature alarm connected to a fire control panel
Heating cable is installed per manufacturer’s instructions with approved connection kits.
Approvals
CSA / UL (CUS) certified for non-hazardous locations.
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Branch Lines with Sprinklers
MultiTrace is designed to maintain branch lines containing sprinklers at 40°F/4°C in areas subject to
freezing.
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:
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
Temperature controller alarm contacts must be connected to the fire control panel
The system is controlled by a Controller with integrated ground fault protection with alarm
contacts connected to a fire control panel
The sprinkler design must account for the sprinkler shadow created by the outer diameter
of the thermal pipe insulation
Closed cell waterproof thermal insulation with flame-retardant waterproof covering is used
Heating cable is installed per manufacturer’s instructions with approved connection kits
Additional heating cable is run to compensate for sprinkler heads, sprigs, valves and pipe
supports as detailed in these design guidelines and installation instructions
Approvals
CSA /UL (CUS) certified for non-hazardous locations.
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Freezer Applications
MultiTrace is designed to keep condensate in dry sprinklers from freezing and may be installed in
freezers located in areas subject to freezing.
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
The system is controlled by a Controller with integrated ground fault protection with alarm
contacts connected to a fire control panel
Closed cell waterproof thermal insulation with flame-retardant waterproof covering is used
The sprinkler design must account for the sprinkler shadow created by the outer diameter
of the thermal pipe insulation
Heating cable is installed per manufacturer’s instructions with approved connection kits
Additional heating cable is run to compensate for sprinkler heads, sprigs, valves and pipe
supports as detailed in these design guidelines and installation instructions
Approvals
CSA / UL (CUS) certified for non-hazardous locations.
Indice
