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WELD-IN THERMOWELLS FOR 1/4" AND 3/8" DIAMETER ELEMENTS

Model 260TWI - Weld-In, Model 385TWI - Weld-In
Please Note: Tel-Tru data on Thermowell performance is from industry standards in common use by design engineers and other manufacturers. Tel-Tru is not responsible for errors resulting from omission, transmission, transposition, printing, or interpretation of such data.

PRESSURE - TEMPERATURE RATING - PSI
Temperature - °F
Well Type Material 70° 200° 400° 600° 800° 1000° 1200°
1-1/2"
Diameter
260TWI		 Carbon Steel 5950 5750 5450 5250 4000 1750 -
304SS 7800 7050 6400 6150 6000 5190 1875
316SS 7800 7800 7250 7100 6950 5800 2720
F-11 7350 7350 7350 7350 7350 2898 504
F-22 7224 7224 7224 7224 7098 3192 546
1-1/2"
Diameter
385TWI		 Carbon Steel 5200 5000 4800 4600 3500 1500 -
304SS 7000 6200 5600 5400 5200 4500 1650
316SS 7000 7000 6400 6200 6100 5100 2500
F-11 6562 6562 6562 6562 6562 2587 450
F-22 6450 6450 6450 6450 6337 2850 487


MAXIMUM FLUID VELOCITY - FEET PER SECOND
Insertion Length - "U"
Well Type Material 2-1/2 4-1/2 7-1/2 10-1/2 13-1/2 16-1/2 19-1/2 22-1/2
1-1/2"
Diameter
260TWI

 		Carbon Steel 493
(306)		 220
(170)		 79.4 40.5 24.5 16.4 11.7 8.8
304SS; 316SS 539
(443)		 233.5
(231)		 84 42.8 25.9 17.3 12.4 9.3
F-11 or F-22 549
(451)		 237
(235)		 85.5 43 26.4 17.6 12.6 9.5
1-1/2"
Diameter
385TWI		 Carbon Steel 451
(286)		 269
(159)		 96.9 49 29.9 20 14 10.7
304SS; 316SS 531
(385)		 285
(220)		 102 52 31.6 21.2 15 11.4
F-11 or F-22 542
(392)		 290
(224)		 104 53.2 32 21.5 15.4 11.6
Note: Values are for steam, air, gas and similar density.
Values shown in parenthesis are for water flow only.

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