Maximum Fluid Velocity, Feet Per Second
(See Velocity Ratings also found in Resources)
Insertion Length — “U” (in)
Well Type Material 21⁄2 41⁄2 71⁄2 101⁄2 131⁄2 161⁄2 191⁄2 221⁄2
3⁄4" Series 40 and 45 Brass 276 (127) 124 (79) 44 22 13  8.0  6.0  4.0
Carbon Steel 352 (228) 191 (114) 68.9 35 21 14 10  7.5
A.I.S.I. 304 & 316 415 (299) 203 (154) 73.2 37.3 22.5 15 11  8.0
Monel 340 (255) 172 (134) 62 31 19 12.8  8.0  6.0
1" Series 40 and 45 Brass 321 (150) 129 (83.5) 46.8 23.6 14.5  9.6  6.9  5.1
Carbon Steel 410 (270) 249 (150) 90.3 45.6 27.8 18.5 13.2  9.8
A.I.S.I. 304 & 316 483 (350) 272 (208) 97.3 49.7 30.4 20.3 14.5 10.7
Monel 396 (306) 214 (167) 77.5 39.2 23.8 16 10.3  7.7


Pressure — Temperature Rating
(lbs. per square inch)
Temperature
Material 70°F 200°F 400°F 600°F 800°F 1000°F 1200°F
Brass 5000 4222 1000
Carbon Steel 5200 5000 4800 4600 3500 1500
A.I.S.I. 304 7000 6200 5600 5400 5200 4500 1650
A.I.S.I. 316 7000 7000 6400 6200 6100 5100 2500
Monel 6500 6000 5400 5300 5200 1500

Additional Resources

Where single values appear in table, thermowell may be considered safe for water, steam, air or gas. The values in parentheses in the shorter insertion lengths represent safe values for water flow, taking into consideration the velocity pressure effect of water flowing at higher velocities.

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