3
WinterGard Selection Guide
Selection Tables
Use one of the tables below to help select
the correct WinterGard heating cable for
your application. (Consult the
Commercial and Residential Application
and Design Guide or H900/H908
Installation Instructions for complete sys-
tem design information.)
Use Table 1 to select heating cables for
insulated metal pipes. Use Table 2 for
insulated plastic pipes.
Read across the table to find your pipe
diameter, then drop down to the line corre-
sponding to the lowest air temperature for
that application and the correct insulation
thickness. The cell at that intersection has
a particular shade and may have a num-
ber.
The shade indicates which heating cable to
use (key to the shades appears to the left of
Table 1). A number in the cell represents
the spiraling ratio (feet of heating cable per
foot of pipe). If no number appears in the
cell, straight trace the pipe. If a number
does appear in the cell, spiral trace the
pipe. If your spiraling ratio is 2.0,
multiple-trace the pipe using two straight
traces at the 4 o’clock and 8 o’clock posi-
tions.
If your spiraling ratio is 3.0, multiple-trace
the pipe using three straight traces at the
11 o’clock or 1 o’clock position and at the 4
o’clock and 8 o’clock positions.
1.3
Insulation
thickness
Lowest
air temp.
0°F
–20°F
–40°F
Pipe diameter
(inches)
0.5 in
1.0 in
1.5 in
0.5 in
1.0 in
1.5 in
2.0 in
0.5 in
1.0 in
1.5 in
0.50
0.75
1.00
1.25
1.50
2.00
2.50
3.00
4.00
6.00
2.0 in
1.8
1.1
1.3
1.5
1.1
1.5
1.1
1.9
1.4
1.1
1.8
1.1
1.2
1.1
1.4
1.4
1.7
2.0
3.0
3.0
Insulation
thickness
Lowest
air temp.
0°F
–20°F
–40°F
Pipe diameter
(inches)
0.5 in
1.0 in
1.5 in
0.5 in
1.0 in
1.5 in
2.0 in
0.5 in
1.0 in
1.5 in
0.50
0.75
1.00
1.25
1.50
2.00
2.50
3.00
4.00
6.00
2.0 in
2.0
1.7
3.0
1.2
1.6
1.2
1.1
1.3
1.5
1.4
1.8
1.1
1.3
3.0
1.7
1.4
3.0
1.8
1.8
1.1
1.2
1.1
1.1
1.5
1.9
3.0
1.8
2.0
1.2
1.4
3.0
3.0
1.1
1.2
1.4
1.6
1.4
1.7
1.1
1.3
1.1
1.2
2.0
3.0
Example 1
Pipe = 2-inch-diameter metal
Lowest air temperature = 0°F
Insulation thickness = 1 inch
Cable length and type = 1 foot of
WinterGard H311 per foot of pipe
Example 2
Pipe = 2.5-inch-diameter plastic
Lowest air temperature = –20°F
Insulation thickness = 1 inch
Cable length = 1.2 feet of WinterGard Plus
H611, H621 or WinterGard Wet H612, H622
H311 WinterGard
H611/621 WinterGard Plus
H612/H622 WinterGard Wet
Increase insulation thickness.
Key to Tables 1 and 2
Table 1. For metal pipes with fiberglass insulation or equivalent
(based on 40°F maintain)
Table 2. For plastic pipes with fiberglass insulation or equivalent
(based on 40°F maintain)
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THERMAL MANAGEMENT SOLUTIONS
EN-RaychemWinterGardSelection-AR-H55235 09/13
