nvent RAYCHEM XL-Trace Step-By-Step Design Manual
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nvent RAYCHEM XL-Trace Step-By-Step Design Manual

nvent RAYCHEM XL-Trace Step-By-Step Design Manual

Fire sprinkler system freeze protection
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FIRE SPRINKLER SYSTEM FREEZE
PROTECTION - XL-TRACE SYSTEM

INTRODUCTION

RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904
This step-by-step design guide provides the tools necessary to design a
nVent RAYCHEM XL-Trace fire sprinkler freeze protection system. For other
applications or for design assistance, contact your nVent representative or call
(800) 545-6258. Also, visit our web site at nVent.com.
CONTENTS
INTRODUCTION ...................................................................................... 1
How to Use this Guide ........................................................................................................... 2
Safety Guidelines .................................................................................................................... 2
Warranty ................................................................................................................................... 2
SYSTEM OVERVIEW ............................................................................... 3
Approvals ................................................................................................................................. 3
Self-Regulating Heating Cable Construction .................................................................... 4
Typical Pipe Freeze Protection System ............................................................................. 5
Fire Supply Lines .................................................................................................................... 6
Sprinkler Standpipes ............................................................................................................. 8
Branch Lines with Sprinklers ............................................................................................... 9
Freezer Application .............................................................................................................. 10
Design Step by Step ............................................................................................................. 11
Step 1 Determine design conditions and pipe heat loss ...................................... 12
Step 2 Select the heating cable ................................................................................. 17
Step 3 Determine the heating cable length ............................................................. 19
Step 4 Determine the electrical parameters ........................................................... 21
Step 5 Select the connection kits and accessories .............................................. 24
Step 6 Select the control system ..............................................................................29
lete the Bill of Materials..............................................................................30
INSTALL ATION AND MAINTENANCE ................................................... 31
PROTECTION DESIGN WORKSHEET ..................................................... 32
This design guide presents nVent recommendations for designing an XL-Trace
pipe freeze protection system for fire sprinkler piping. It provides design and
performance data, control options, electrical sizing information, and application
configuration suggestions. This guide does not give information on how to design
your fire protection system.
This guide does not cover applications in which any of the following conditions exist:
• Hazardous locations, as defined in national electrical codes
• Supply voltage other than 120 V or 208-277 V
If your application conditions are different, or if you have any questions,
contact your nVent representative or call (800) 545-6258.
|
nVent.com
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Summary of Contents for nvent RAYCHEM XL-Trace

  • Page 1: Table Of Contents

    This step-by-step design guide provides the tools necessary to design a nVent RAYCHEM XL-Trace fire sprinkler freeze protection system. For other applications or for design assistance, contact your nVent representative or call (800) 545-6258. Also, visit our web site at nVent.com. CONTENTS INTRODUCTION ..................

  • Page 2: How To Use This Guide

    • Additional installation instructions are included with the connection kits, controllers, and accessories If you do not have the above documents, you can obtain them from the nVent web site at nVent.com. For products and applications not covered by this design guide, please contact your nVent representative or call (800) 545-6258.

  • Page 3: System Overview

    XL-Trace system; 5XL, 8XL, and 12XL for applications using 120 V and 208–277 V power supplies.

  • Page 4: Self-Regulating Heating Cable Construction

    Constant wattage Constant wattage Temperature Temperature Fig. 2 Self-regulating heating cable technology nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...

  • Page 5: Fire Suppression System Freeze Protection Applications

    Ambient sensing RTD RayClic-LE lighted end seal XL-Trace Thermal insulation C910-485 RayClic-S splice electronic controller Standpipe Power RayClic-PC distribution Fire power connection panel alarm Control valves panel in heated enclosure Ground Fig. 3 Typical XL-Trace pipe freeze protection system nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...

  • Page 6: Fire Supply Lines

    • The heating cable is installed per manufacturer’s instructions with approved nVent RAYCHEM connection kits. See Table 11 on page 25 and the XL-Trace System Installation and Operation Manual (H58033).
  • Page 7 RayClic connection kits. Fig. 5 Typical buried piping system Application Requirements The system complies with nVent requirements for use on buried insulated metal or plastic pipe when: • The heating cable is permanently secured to insulated metal pipes with GT-66 glass tape or to plastic pipes using AT-180 aluminum tape.

  • Page 8: Sprinkler Standpipes

    • The heating cable is installed per manufacturer’s instructions with approved nVent connection kits. See Table 11 on page 25 and the XL-Trace System Installation and Operation Manual (H58033).

  • Page 9: Branch Lines With Sprinklers

    • The heating cable is installed per manufacturer’s instructions with approved nVent connection kits. See Table 13 on page 27 and the XL-Trace System Installation and Operation Manual (H58033). • Additional heating cable is installed to compensate for sprinkler heads,...

  • Page 10: Freezer Application

    • The heating cable is installed per manufacturer’s instructions with approved nVent connection kits. See Table 13 on page 27 and the XL-Trace System Installation and Operation Manual (H58033). • Additional heating cable is installed to compensate for sprinkler heads, sprigs, valves and pipe supports as detailed in the Table 6 on page 20 of this document and the XL-Trace System Installation and Operation Manual (H58033).

  • Page 11: Fire Suppression System Freeze Protection Design

    TraceCalc Pro for Buildings is an online design tool available to help you create simple or complex heat-tracing designs for pipe freeze protection or flow maintenance applications. It is available at nVent.com. Design Step by Step Your system design requires the following essential steps.

  • Page 12: Step 1 Determine Design Conditions And Pipe Heat Loss

    Location Indoors Maintain temperature (T 40°F (4°C) Minimum ambient temperature (T 0°F (–18°C) Pipe diameter and material 1-inch metal Pipe length 200 ft (61 m) Thermal insulation type and thickness 1/2-inch closed-cell foamed elastomer Supply voltage 208 V nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...
  • Page 13 ΔT 50°F and ΔT 100°F + [0.20 x (Q – Q )] = 8.1 + [0.20 x (16.8 – 8.1)] = 9.8 W/ft Pipe heat loss (Q 9.8 W/ft @ T 40°F (32.1 W/m @ T 4°C) nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...
  • Page 14 Thermal insulation type and thickness 1/2-inch closed cell foamed elastomer Pipe heat loss Q 2.8 W/ft @ T 40°F (9.2 W/m @ T 4°C) 2.8 W/ft x 1.0 x 0.79 = 2.20 W/ft @ corrected 410°F (7.3 W/m @ T 4°C) nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...
  • Page 15 Pipe diameter (IPS) in inches thickness (in) °F °C 1-1/4 1-1/2 2-1/2 3-1/2 11.5 13.5 16.0 18.0 11.2 13.4 14.9 17.9 21.1 25.0 28.1 10.2 10.6 12.2 14.2 15.9 10.5 11.6 Note: Multiply the W/ft heat loss values by 3.28 for W/m. nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...
  • Page 16 50°F (10°C) (BTU/hr–°F–ft /in) Insulation multiple Examples of preformed pipe insulation 0.1–0.2 Rigid cellular urethane (ASTM C591) 0.2–0.3 Glass fiber (ASTM C547) Foamed elastomer (ASTM C534) 0.3–0.4 Cellular glass (ASTM C552) Mineral fiber blanket (ASTM C553) nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...

  • Page 17: Step 2 Select The Heating Cable

    (54) (°C) Pipe temperature 5XL1-CR and 5XL1-CT (120 V) 8XL1-CR and 8XL1-CT (120 V) 12XL2-CR and 12XL2-CT (208 V) 5XL2-CR and 5XL2-CT (208 V) 8XL2-CR and 8XL2-CT (208 V) Fig. 11 Heating cable power output on metal pipe nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...
  • Page 18 5XL2 = 5.6 W/ft @ 40°F (from Fig. 11) Supply voltage correction factor 1.00 (from Table 4) Pipe material correction factor Metal = 1.00 Corrected heating cable power 5.6 x 1.00 x 1.00 = 5.6 W/ft Selected heating cable 5XL2 nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...

  • Page 19: Step 3 Determine The Heating Cable Length

    7. Complete the Bill supports, and flanges) of Materials TABLE 5 ADDITIONAL HEATING CABLE FOR VALVES Pipe diameter (IPS) inches Heating cable feet (meters) (0.24) (0.4) (0.6) 1-1/4 (1.1) 1-1/2 (1.3) (1.3) (1.3) (1.3) (1.5) (1.5) (1.7) (1.9) (2.2) (2.9) 10.5 (3.2) nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...
  • Page 20 4.0 ft (1.2 m) + 2.0 ft (0.6 m) + 60 ft (18.3 m) = 66 ft (20.1 m) Total heating cable length required 200 ft x 1 run + 66 ft = 266 ft (81 m) of 5XL2-CR nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...

  • Page 21: Step 4 Determine The Electrical Parameters

    WARNING: To minimize the danger of fire from sustained electrical arcing if the heating cable is damaged or improperly installed, and to comply with the requirements of nVent, agency certifications, and national electrical codes, ground-fault equipment protection must be used on each heating cable branch circuit.
  • Page 22 266 ft / (398 ft max 30 A CB at 0°F) = 0.67 circuits Round up to 1 circuit DETERMINE TRANSFORMER LOAD Transformers must be sized to handle the load of the heating cable. Use the following tables to calculate the total transformer load. nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...
  • Page 23 208 V Minimum start-up temperature 0°F (–18°C) (from Step 1) Max A/ft at 0°F x Total feet x Supply voltage = (0.060 A/ft x 266 ft x 208 V) / 1000 1000 Transformer load (kW) = 3.3 kW nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...

  • Page 24: Step 5 Select The Connection Kits And Accessories

    5. Select the WARNING: Approvals and performance are based on the use of connection kits and accessories nVent-specified parts only. Do not substitute parts or use vinyl electrical tape. 6. Select the control system 7. Complete the Bill ABOVEGROUND PIPING...
  • Page 25 Low-profile splice/tee; use as As required 3 ft (0.9 m) needed for pipe branches RayClic-LE Lighted end seal (RayClic-SB-04 pipe Alternate end seal 2 ft (0.6 m) mounting bracket included) RayClic-E Replacement end seal Additional end seal 0.3 ft (0.1 m) nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...
  • Page 26 50 (15 m) 40 (12 m) 25 (8 m) 20 (6 m) 15 (5 m) Feet of pipe per GS-54 roll 49 (15 m) 41 (13 m) 33 (10 m) 20 (6 m) 16 (5 m) 12 (4 m) nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...
  • Page 27 Note: FTC-XC is required for circuits requiring 40 A circuit breakers. RayClic-LE Lighted end seal (RayClic-SB-04 pipe Alternate 2 ft (0.6 m) mounting bracket included) end seal RayClic-E Replacement end seal Additional 0.3 ft (0.1 m) end seal nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...
  • Page 28 50 (15 m) 40 (12 m) 25 (8 m) 20 (6 m) 15 (5 m) Feet of pipe per GS-54 roll 49 (15 m) 41 (13 m) 33 (10 m) 20 (6 m) 16 (5 m) 12 (4 m) nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...

  • Page 29: Step 6 Select The Control System

    Flow Maintenance and Flow Maintenance Temperature control with heating cable circuit supervision is required by approval agencies, codes and nVent. To satisfy this requirement nVent offers a wide variety 1. Determine design conditions and of monitoring and control options for fire suppression system.

  • Page 30: Step 7 Complete The Bill Of Materials

    2. Select the heating cable 3. Determine the heating cable length 4. Determine the electrical parameters 5. Select the connection kits and accessories 6. Select the control system 7. Complete the Bill of Materials nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...

  • Page 31: Installation And Maintenance

    When installing XL-Trace on dry pendant sprinklers used in freezer applications follow the methods shown below: Thermal pipe insulation Sprinkler pipe XL-Trace heating cable Freezer wall Length = 2 x dry sprinkler length insulation Freezer Fig. 15 XL-Trace on extended pendant sprinklers nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...

  • Page 32: Xl-Trace System Fire Sprinkler System Freeze Protection Design Worksheet

    TraceCalc Pro for Buildings is an online design tool available to help you create simple or complex heat-tracing designs for pipe freeze protection or flow maintenance applications. It is available at nVent.com. Step 1 Determine design conditions and pipe heat loss Design conditions Min.
  • Page 33 + [0.67 x (Q − Q )] = 1.4 + [0.67 x (3.5 − 1.4)] = 2.8 W/ft B-50 B-50 B-20 B-40 Pipe heat loss (Q 2.8 W/ft @ T M 40°F (9.2 W/m @ T M 4°C) nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...
  • Page 34 1-1/2 in foamed elastomer Insulation thickness and type 2.8 W/ft @ T 40°F (9.2 W/m @ T 4°C) 1.00 Insulation multiple 0.79 Indoor multiple 2.8 W/ft x 1.0 x 0.79 = 2.2 W/ft @ T 40°F (7.3/m @ T 4°C) CORRECTED nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...
  • Page 35 Corrected heating cable power: 5.6 @/ft x 1.00 x 1.00 = 5.6 W/ft Select: 5XL2 Select outer jacket  -CR  -CT (Required for buried applications) Example: Pipe Freeze Protection − Branch line with sprinklers Location Aboveground, indoors Selection: 5XL2-CR nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...
  • Page 36 Additional heating cable Total Total: 66 ft Total heating cable length 200 ft 66 ft 266 ft Pipe length Number of heating Additional cable for valves, Total heating cable cable runs pipe supports, flanges, and sprinklers length required nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...
  • Page 37 Max A/ft* at minimum start-up temperature Heating cable length Supply voltage Transformer load (kW) Example: 0.06 A/ft 266 ft 208 V 3.3 kW / 1000 Max A/ft* at minimum start-up temperature Heating cable length Supply voltage Transformer load (kW) nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...
  • Page 38 ❑ GS-54 Glass cloth adhesive tape _____________ ❑ AT-180 Aluminum tape (for plastic pipes) _____________ Total heating cable allowance for connection kits Total heating cable length Total heating cable allowance for connection kits Total heating cable length required nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...
  • Page 39 Resistance temperature device ❑ RTD10CS _____________ Resistance temperature device ❑ RTD-200 _____________ Resistance temperature device ❑ RTD50CS _____________ Step 7 Complete the Bill of Materials Use the information recorded in this worksheet to complete the Bill of Materials. nVent.com RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...
  • Page 40 TRACER nVent.com ©2019 nVent. All nVent marks and logos are owned or licensed by nVent Services GmbH or its affiliates. All other trademarks are the property of their respective owners. nVent reserves the right to change specifications without notice. RAYCHEM-DG-H58489-XLTraceFireSprinkler-EN-1904...

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