Accessories / Thermowells

Thermowells essentially protection tubes used to house thermocouple and RTD probes in harsh conditions, such as in high pressures, flows or corrosive fluids. Thermowells will impact response time, but are absolutely critical in tough industrial conditions. They are often threaded, flanged or welded into place. RdF offers a variety of design options and materials to suit challenging applications.

Please contact us for assistance.

Type “S”

Standard Well, No Lag

"X" NPT "Q" DIA
3/4" 3/4"
1" 7/8"

Type “L”

Standard Well, With Lag

"X" NPT "Q" DIA
1/2" 5/8"
3/4" 3/4"
1" 7/8"

Type “H”

Heavy Duty, No Lag

"X" NPT "Q" DIA
3/4" 7/8"
1" 1 1/16"

Type “T”

Heavy Duty, With Lag

"X" NPT "Q" DIA
3/4" 7/8"
1" 1 1/16"

Type “W”

Socket Weld

PIPE SIZE "P" DIA.
3/4" 1.050"
1" 1.315"

Type “F”

Flanged

Type “G”

Flanged, Heavy Duty

Ordering Specifications



SX
LX
HX
TX
WP
FM
GM

TYPE AND DESIGNATOR FROM TABLES

Standard threaded well; no lag extension
Standard threaded well; with lag extension
Heavy Duty – no lag
Heavy Duty – with lag
Socket Weld
Flanged
Flanged Heavy Duty

  DESIGNATORS    
X PROCESS THREAD
1

1/2" NPT (TYPE L ONLY, T=0.5" MIN.)

2

3/4" NPT

 

 
3

1" NPT

 

 

P PIPE SIZE M FLANGE MATERIAL

2

3/4"

 

(SEE THERMOWELL

3

1"

 

MATERIAL)
 
   STEM (“A”) – LENGTH IN INCHES
 
    INSERTION (“U”) – LENGTH OF THERMOWELL IN INCHES
 
    LAG (“T”) – LENGTH IN INCHES
 
    THERMOWELL MATERIAL

A
B
C
D
Z

Carbon Steel C1018
SS 304
SS 316
SS 316L
Chrome/Moly (F22)

E
F
G
H

Hastelloy C
Inconel 600
SS 446
Mondel

J
K
L
M

Brass
Hastelloy B
Titanium
321 SS

N
P
Q
R

347SS
317SS
2205SS
321 HSS

    FLANGE FOR TYPE F OR G (face type and rating in Lbs., ie: R300)
R
RTJ
F 		Raised Face        (150Lbs., 300Lbs., 600Lbs.
Ring Type Joint    900Lbs., 1500Lbs.)
Flat Face
 
    FLANGE SIZE FOR TYPE F OR G: 1", 1.5", 2", 2.5", 3", 4"
FC
–
6
–
4
–
0
–
C
–
R300
–
1.5
–   Typical Write-Up