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TI01383T/09/EN/01.18
71391761
Products Solutions Services
Technical Information
TU51, TU52, TU53 and TU54
Heavy duty - general purpose thermowell made of drilled
barstock material
Application
The thermowell is designed for use with RTD and
thermocouple assemblies mainly in heavy duty applications for
process industries.
Your benefits
• Industry standard thermowells manufactured from round
barstock.
• The process connections can be weld-in, socket weld,
threaded, or flanged with double sided standard or full
penetration welds.
• The thermowell stem shape can be straight, stepped, or
tapered.
• Variable lag and immersion lengths.
• CRN approved thermowells
• The standard material of construction is 316/316L
• Special versions can be manufactured according to
specifications.
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Installation instructions
L
3
2
4
TU51, TU52, TU53 and TU54
Installation Conditions
Design, dimensions
1 Installation examples
1-2 In pipes with a small cross section the sensor tip should reach or extend slightly past the center line of the
pipe (-L).
3-4 Tilted installation
The immersion length of the thermometer influences the accuracy. If the immersion length is too
short the measurement may be impacted by the pipe wall and process connection causing errors. If
installing into a pipe then the ideal immersion length should extend to or slightly past the center line
of the pipe, if possible (see 1 and 2), especially in laminar flow. A further solution could be an angled
(tilted) installation (see 3 and 4). When determining the immersion length, take into account all
process (e.g. flow velocity, viscosity, process pressure).
• Installation possibilities: Pipes, tanks or other plant components
• A general rule of thumb is to design the insertion length to be 10 times the diameter of the
thermowell.
Mechanical Construction
All dimensions in inches. For values related to the graphics please refer to the tables and equations
below.
A0023412
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TU51, TU52, TU53 and TU54
¼”
¼”
"5/8”
1¾”
+ T
1¾”
+ T
Q
1
U
U
A
A
P P
2¼”
+ T
U
4
6
1
2
3
"0.26”
"0.26”
¼”
5
7
"0.26”
A
¼”
Q
1
Q
1
Q
2
Q
2
Q
2
A
¾”
¼”
T
U
2½”
1”
"0.26”
Q
1
Q
2
A0035779
2 Dimensions of the thermowells
1 TU51 weld-in thermowell (tapered)
2 TU52 socket weld thermowell (tapered)
3 TU53 threaded thermowell (stepped)
4 TU54 flange thermowell (tapered)
5 Full penetration weld thermowell
6 Standard weld thermowell
7 Straight thermowell tip
P Pipe size
Q1 Thermowell root diameter
Q2 Thermowell tip diameter
T Lag dimension
U Thermowell immersion length
A Drill depth of thermowell
Dimensional Details
General Dimensions
Type Weld-in Socket-weld Threaded Flanged
Process Connections ¾" and 1" ¾" and 1" ½", ¾" and 1" 1", 1-½", 2"
Immersion Length 2" to 24"
Lag Length Up to 6" (in ½" increments)
Instrument Connection ½" NPT
TU51 TU52 TU53 TU54
ANSI Flange
150 to 1500 RF
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TU51, TU52, TU53 and TU54
L
D
K
d
b
f
TU51 TU52 TU53 TU54
Bore Diameter 0.26"
Tip Thickness 0.25"
Roughness 32µin (0.8µm)
TU51 Weld-in Thermowells
NPS ¾" 1"
P 1.050" 1.315"
Q1 (root) 1.050" 1.315
Q2 (tip) 5/8" 5/8"
TU52 Socket-weld Thermowells
Stepped Straight Tapered
NPS ¾" 1" ¾" 1" ¾" 1"
P 1.050" 1.315" 1.050" 1.315" 1.050" 1.315"
Q1 (root) ¾" 7/8" ¾" 1" 7/8" 1"
Q2 (tip) ½" ½" ¾" 1" 5/8" 5/8"
TU53 Threaded Thermowells
Stepped* Straight Tapered
NPT ½" ¾" 1" ½" ¾" 1" ¾" 1"
Q1 (root) 5/8" ¾" 7/8" 5/8" ¾" 7/8" 7/8" 1-1/16"
Q2 (tip) ½" ½" ½" 5/8" ¾" 7/8" 5/8" 5/8"
*Stepped versions with U < 3" will have Q = V = ½"
TU54 Flanged Thermowells
Stepped Straight Tapered
Flange 1" and larger 1" and larger 1" 1-½" and larger
Q1 (root) ¾" ¾" 7/8" 1-1/16"
Q2 (tip) ½" ¾" 5/8" 5/8"
Flange
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TU51, TU52, TU53 and TU54
For detailed information on the flange dimensions refer to the following flange standard: ANSI/
ASME B16.5.
The flange material must be the same as of the stem of the thermowell.
Specification Tolerances
Item Tolerance
Well up thickness ¼" ± 1/16”
Root/Tip Diameter ± 0.01”
Insertion Length (A Dim.) ± 1/16”
Bore Diameter + 0.005” / - 0.003”
Barstock Thermowell OD Milling Standard: + 0.000” / - 0.031”
Flanged Wells
Manufactured in accordance with ASME/ANSI B16.5
Pipe Threads
Manufactured in accordance with ANSI B1.20.1
Materials
In compliance with ASTM specifications (or other applicable National Standards)
Process connection and thermowell
The temperatures for continuous operation specified in the following table are only intended as
reference values for use of the various materials in air and without any significant compressive load.
The maximum operation temperatures are reduced considerably in some cases where abnormal
conditions such as high mechanical load occur or in aggressive media.
Material
name
AISI 316L,
complies
with
1.4401 or X5CrNiMo17-12-2
1.4404 X2CrNiMo17-13-2
Short form Recommended
max. temperature
for continuous use
in air
650 °C (1 202 °F)1)• Austenitic, stainless steel
Properties
• High corrosion resistance in general
• Particularly high corrosion resistance in chlorinebased and acidic, non-oxidizing atmospheres
through the addition of molybdenum (e.g.
phosphoric and sulfuric acids, acetic and tartaric
acids with a low concentration)
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Certificates and Approvals
TU51, TU52, TU53 and TU54
Test Reports
Other Standards and Guidelines
Product Configurator
Standard Tests available
• Internal Hydrostatic Pressure
• Dye Penetrant
• Others available upon request
• ASME B1.20.1
• FM 3615
• CSA C22.2 No 05
• ANSI/ASME B16.5
• ASME PTC 19.3 TW2016: Performance Test Codes
Ordering information
Product Configurator - the tool for individual product configuration
Detailed ordering information is available from the following sources:
• In the Product Configurator on the Endress+Hauser website: www.endress.com→ Select country→
Instruments→ Select device→ Product page function: Configure this product
• From your Endress+Hauser Sales Center: www.endress.com/worldwide
• Up-to-the-minute configuration data
• Depending on the device: Direct input of measuring point-specific information such as measuring
range or operating language
• Automatic verification of exclusion criteria
• Automatic creation of the order code and its breakdown in PDF or Excel output format
• Ability to order directly in the Endress+Hauser Online Shop
Service-specific accessories
Accessories
Accessories Description
Applicator Software for selecting and sizing Endress+Hauser measuring devices:
• Calculation of all the necessary data for identifying the optimum measuring
device: e.g. pressure loss, accuracy or process connections.
• Graphic illustration of the calculation results
Administration, documentation and access to all project-related data and
parameters over the entire life cycle of a project.
Applicator is available:
• Via the Internet: https://wapps.endress.com/applicator
• On CD-ROM for local PC installation.
Configurator
+temperature
Software for selecting and configuring the product depending on the measuring
task, supported by graphics. Includes a comprehensive knowledge database and
calculation tools:
• For temperature competence
• Quick and easy design and sizing of temperature measuring points
• Ideal measuring point design and sizing to suit the processes and needs of a wide
range of industries
The "Configurator" is available:
On request from your Endress+Hauser sales office on a CD-ROM for local PC
installation.
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W@M Life cycle management for your plant
W@M supports you with a wide range of software applications over the entire
process: from planning and procurement, to the installation, commissioning and
operation of the measuring devices. All the relevant device information, such as
the device status, spare parts and device-specific documentation, is available for
every device over the entire life cycle.
The application already contains the data of your Endress+Hauser device. Endress
+Hauser also takes care of maintaining and updating the data records.
W@M is available:
• Via the Internet: www.endress.com/lifecyclemanagement
• On CD-ROM for local PC installation.
FieldCare FDT-based plant asset management tool from Endress+Hauser.
It can configure all smart field units in your system and helps you manage them. By
using the status information, it is also a simple but effective way of checking their
status and condition.
For details, see Operating Instructions BA00027S and BA00059S
Documentation
Technical information
• T13, T14 and T15 Explosion proof RTD assembly in thermowell, TI00126R/09/EN
• TH13, TH14 and TH15 RTD assembly in thermowell, TI00110R/09/EN
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www.addresses.endress.com
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