Page 41 - Pipeline Rules of Thumb Handbook

28 Pipeline Rules of Thumb Handbook

-60 -70 -95 -110 -120 -135 -140 -145 -150

-55 -65 -90 -105 -115 -125 -130 -135 -140

-50 -55 -80 -100 -110 -120 -125 -130 -130

-45 -50 -75 -90 -100 -110 -115 -120 -125

Cooling Power of Wind Expressed as “Equivalent Chill Temperature”, °F
-40 -45 -70 -85 -95 -105 -110 -115 -115 Great Danger (Flesh may freeze within 30 seconds)

-35 -40 -60 -80 -85 -95 -100 -105 -110

-30 -35 -60 -70 -80 -90 -95 -100 -100

-25 -30 -50 -65 -75 -80 -85 -90 -95

-20 -25 -45 -60 -65 -75 -80 -80 -85
Equivalent Chill Temperature

-15 -20 -40 -50 -60 -65 -70 -75 -75

-10 -15 -35 -45 -50 -60 -65 -65 -70

-5 -10 -25 -40 -45 -50 -55 -60 -60

0 -5 -20 -30 -35 -45 -50 -50 -55
0 Increasing Danger (Flesh may freeze within 1 minute)
5 -15 -25 -30 -35 -40 -40 -45
5
10 -10 -20 -25 -30 -30 -35 -35

15 10 0 -10 -15 -20 -25 -30 -30

20 15 5 -5 -10 -20 -25 -30 -20

25 20 10 0 0 -5 -10 -10 -10

30 25 15 10 5 0 0 -5 -5 Little Danger

35 40 30 35 20 30 15 30 10 25 10 20 5 15 5 10 0 10

Wind chill chart Wind Speed MPH Knots Calm Calm 5 3–6 10 7–10 15 11–15 20 16–19 25 20–32 30 24–28 35 29–32 40 33–36 Winds above 40°F have little additional effect