PIPe FReeze PROTeCTIOn AnD FLOW MAInTenAnCe
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Determine the pipe heat loss:
See Table 2 for the base heat loss of the pipe (Q
b
) . If the
D
T for your system is not listed, interpolate between the two
closest values .
Q
B-50
∆T1
W/ft (W/m)
Q
B-100
∆T2
W/ft (W/m)
Q
B
W/ft (W/m)
in
in
°F (°C)
W/ft (W/m)
W/ft (W/m)
Example: Pipe Freeze Protection − Water Piping
Pipe diameter
2 in
1 in
60°F
Insulation thickness
3.2 W/ft
6.8 W/ft
∆T
Q
B-50
Q
B-100
Pipe diameter
Insulation thickness
∆T
Q
B-50
Q
B-50
∆T 60°F is 20% of the distance between ∆T 50°F and ∆T 100°F
Q
B-50
+ [0.20 x (Q
B-100
− Q
B-50
)]
∆T interpolation
3.2
+ [0.20 x (6.8 − 3.2)] = 3.9 W/ft
Q
B-60
3.9 W/ft @ T
M
40°F
Pipe heat loss (Q
B-60
)
