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THERMAL MANAGEMENT SOLUTIONS
EN-RaychemWinterGardH900-IM-H53665 01/13
THERMAL MANAGEMENT SOLUTIONS
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2. calculate the total heating cable length required
Length = A + b + c + D + E + F + G + H
A Pipe length x spiraling ratio
b 4 ft x # gate/globe valves x valve length (ft) x spiraling ratio
c 2 ft x # ball/butterfly valves x valve length (ft) x spiraling ratio
D 2 ft x # flanges x pipe diameter (ft) x spiraling ratio
E 2 ft x # pipe supports v pipe diameter (ft) x spiraling ratio
F 1 ft for each power connection
G 2 ft for each splice connection
H 3 ft for each tee connection
= Total heating cable length (ft)
3. Determine the maximum heating cable circuit length allowed.
See Table 3 on the next page. Ensure that your circuits do not
exceed the maximum circuit length listed in Table 3. If necessary,
use additional shorter circuits.
Example (taken from Example 2 [on metal pipe], page 3):
Pipe length:
50 ft
Spiral ratio:
1.3 (from Table 1, page 3)
Globe valves:
3 (each 0.5 ft long)
Pipe supports:
10 supports for 1 in pipe
Power connections:
1
Splice connections:
1
WinterGard heating cable required:
A Pipe length x spiral ratio
= 50 ft x 1.3
= 65.0 ft
b 3 globe valves (0.5 ft each) = 4 ft x 3 x 0.5 x 1.3
= 7.8 ft
c 0 ball/butterfly valves
= 0 =
0
D 0 flanges
= 0 =
0
E 10 pipe supports
= 2 ft x 10 x 0.085* x 1.3 = 2.2 ft
F 1 power connection
= 1 ft x 1
= 1.0 ft
G 1 splice connection
= 2 ft x 1
= 2.0 ft
H 0 tee connection
= 0 =
0
Total heating cable length required
= 78.0 ft
*1 in pipe diameter / 12 in per foot = 0.085 foot
HEATING cAbLE INSTALLATION
1. prepare for installation.
• Store the heating cable in a clean, dry place.
• Complete piping pressure test.
• Review the WinterGard heating cable design and compare to
materials received to verify that the proper WinterGard heating
cable and accessories are available. The WinterGard heating
cable will have the heating cable type printed on the outer jacket.
• Walk the system and plan the routing of the WinterGard
heating cable on the pipe.
2. cut the heating cable to length.
• Cut the heating cable to the length required. This can be done
before or after the cable is attached to the pipe. Leave a minimum
of 1 foot extra heating cable for connection to power. For splice
and tee connections, leave a minimum of 1 foot for each section
of heating cable. WinterGard heating cable can be cut to length
without affecting its heat output per foot.
• Protect the heating cable ends from moisture or mechanical
damage if they will be left exposed before connection.
3. position and attach heating cable to pipe.
• Be sure all piping to be traced is dry.
• Install heating cable, using straight tracing, spiraling, or multiple
tracing according to the “Heating cable selection and design”
section on page 3.
• For straight tracing, install the heating cable on a lower half of the
pipe; for example, in the 4 o’clock or 8 o’clock position.
• Be sure to install the additional heating cable required for valves,
flanges, etc. as indicated in Step 2 of the “Heating cable selection
and design” section.
• When the design calls for spiraling, begin by suspending a loop
every 10 feet as shown in Figure 1. To determine the loop length,
obtain the spiral factor from Table 1 or 2 and multiply by 10. For
example, if a spiral factor of 1.3 is called for, leave a 13-foot loop
of heating cable at every 10-foot section of pipe. Grasp the loop
in its center and wrap it around the pipe. Even out the distance
between spirals by sliding the wraps along the pipe. Use glass
tape to secure the center of the loop to the pipe. Secure the
heating cable flat to the pipe to obtain good contact.
• Tape WinterGard heating cable to the pipe at 2-foot intervals using
Raychem H903 fiberglass application tape or nylon cable ties. Do
not use vinyl electrical tape, duct tape, metal bands, or wire.
4. Install heating cable end seals, splices, tees, and power
connection.
• Install all end seals, splices, tees, and power connection prior to
plugging in.
• If splicing or teeing, use only the H910 WinterGard Splice and Tee
Kit to satisfy code and agency requirements.
• H900 kit assembly instructions begin on page 9.
5. check the installation.
• Prior to installing thermal insulation, make sure the heating
cable is free of mechanical damage (from cuts, clamps, etc.) and
thermal damage (from solder, overheating, etc.).
• Visually check all power connections, end seals, splices, and tees.
• Using a megohmmeter, test each circuit according to the
instructions in the “Heating cable testing and maintenance”
section (page 5) both before and after installing the thermal
insulation.
Figure 1. Spiraled heat tracing
10 feet
Glass tape
(typical)
Heating
cable
Tape after
spiraling
heating
cable on
pipe
Wrap loops
in opposite
direction
Pull heating
cable loop
length
Apply glass
tape before
spiraling
heating cable
on pipe
