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WIKA · Temperature measurement · Family TW25

Weld-in thermowell

Weld-in thermowell suitable for high process loads in petrochemical industry and plant construction, available in tapered, straight, and stepped designs.
2.2 test report3.1 inspection certificate
Price
On request
Depends on configuration
Request a quote
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Description

Each thermowell/protection tube is an important component of any temperature measuring location. It is used to separate the process from the surrounding area, thus protecting the environment and operating personnel and keeps aggressive media, high pressures and flow rates from the temperature probe itself and thereby enables the thermometer to be exchanged during operation.

Based on the almost limitless application possibilities, there are a large number of variants, such as thermowell designs or materials. The type of process connection and the basic method of manufacture are important design differentiation criteria. A basic differentiation can be made between threaded and weld-in thermowells/protection tubes, and those with flange connections.

Special features

  • Variable welding diameters
  • International standard
  • Possible thermowell forms: Design TW25-A: tapered Design TW25-B: straight Design TW25-C: stepped
  • Design TW25-A: tapered
  • Design TW25-B: straight
  • Design TW25-C: stepped
Identification
ModelTW25
SubcategoryWeld-in thermowell
Process conditions
Process connection
Welding diameter 25.4 ... 49.5 mm½ NPT female threadG ½ female thread1/2 NPT female threadG1/2 female thread
Materials
Thermowell materialStainless steel 316/316L, Stainless steel 304/304L, A105, Stainless steel 1.4571, Other materials on request, Special materials
Operating environment
Weight0.4 kg
Certifications and approvals
Certifications
2.2 test report3.1 inspection certificate
Additional details
ThermowellYes
Thermowell formDesign TW25-A: Tapered, Design TW25-B: Straight, Design TW25-C: Stepped
Datasheet languagesEN
Tables from datasheet
Basic information
Thermowell form
DesignTW25-ATapered
DesignTW25-BStraight
DesignTW25-CStepped
Material (wetted)■ Stainless steel 316/316L ■ Stainless steel 304/304L ■ A105 ■ Stainless steel 1.4571 ■ Special materials → Other materials on request
Process connection
Type of process connectionWelding diameter (Bar diameter) to customer specification from 25.4 ... 49.5 mm[1 ... 1.95 in]
Connection to thermometer■ ½NPTfemale thread ■ G½female thread
Bore size■ Ø6.6 mm[0.260 in] ■ Ø8.5 mm[0.355 in]
Insertion length U■ 100 mm[2.5 in] ■ 150 mm[5.9 in] ■ 200 mm[7.87 in] ■ 250 mm[9.84 in] ■ 300 mm[11.81 in] ■ 350 mm[13.78 in] ■ 400 mm[15.75 in]■ 6 in [152 mm] ■ 7 in [178 mm] ■ 10 in [254 mm] ■ 13 in [330 mm] ■ 16 in [406 mm]
Min. insertion lengthDepending on the selected version
Max. insertion length 1)800 mm[31.5 in]
Connection length H45 mm[1.75 in]
Min. Connection lengthDepending on the selected version
Max. Connection length250 mm[10 in]
Tip thickness6.4 mm[0.25 in]
Suitable stem lengths l 1 (dial thermometer) with tip thickness 6.4 mm[0.25→ Other tip thicknesses on request in]
Connection design S, 4, 4.1, 5, 6.1, 6.2, 6.3 und 7Parallel thread Tapered threadl 1 = U + H - 10 mm[0.4 in] l 1 = U + H - 2 mm[0.08 in]
Connection design 2l 1 = U + H - 30 mm[1.2 in]
Operating conditions
Max. process temperature, process pressureDepending on: ■ Thermowell design - Dimensions - Material ■ Process conditions - Flow rate - Medium density
Wake frequency calculation (option)The calculation in accordance with ASME PTC 19.3 TW-2016 of individual thermowells minimises the risk of dynamic damage that can be caused by the vortex shedding of a Kármán vortex street (Vortex Induced Vibration; VIV). In addition, the static loads due to lateral flow and the process pressure are calculated depending on the temperature. The calculation can be carried out independently using an online tool or as aWIKA engineered service (subject to charges). → For further information, see Technical information IN 00.15 'Wake frequency calculation'.
Dimensions in mm[in]Weight in kg [lbs] (for H = 45 mm[1.771 in])
Ø PNØ QØVØ BU = 100 mm[3.937 in]U = 560 mm[22.047 in]
25.4 [1.000]■ ½NPT ■ G½25.4 [1.000]19 [0.750]■ 6.6 [0.259] ■ 8.5 [0.334]0.4 [0.881]1.5 [3.306]
35.0 [1.380]■ ½NPT ■ G½35.0 [1.380]19 [0.750]■ 6.6 [0.259] ■ 8.5 [0.334]0.7 [1.543]2.8 [6.172]
49.5 [1.945]■ ½NPT ■ G½49.5 [1.945]19 [0.750]■ 6.6 [0.259] ■ 8.5 [0.334]1.4 [3.086]4.9 [10.802]
View all (6)
Overview of versions
TW10Thermowell with flange
TW15/TW50Threaded thermowell
TW20Weld-in thermowell (for welding socket)
TW25Weld-in thermowell (variable welding diameter)
TW30Thermowell in Vanstone design for lap flanges
Dimensions in mm[in] Surface texture z y x Tol. ISO 2768 - mK 0,5 ...6 >6 >30 >120 ...30 ...120 ...400 Check indicator language nominal sizeRoot diam- eter mm [inch] units SIZE ISO 14405  8015 Nur zur DR commentsTip diam- eter www.wika.com D-63911 Klingenberg ALEXANDER WIEGAND SE & Co. KG Information sheets 1 / 1Strake heightStrake depthScruton length 1)Insertion length 1)
- 63 16 4 1 ± 0,1 ± 0,2 ± 0,3 ± 0,5 GER/ENGØ Q ISOØV DEKLI1_EN_A4M_T01 26.04.2023ShSwSLU
1" pipe schedule 5 ... 8024 [0.945]17 [0.669]2.5 [0.098]2.5 [0.098]Max. 800 [31.5]Max. 1,000 [39]
1 ½" pipe schedule 5 ... 16030 [1.181]20 [0.787]2.5 [0.098]2.5 [0.098]Max. 800 [31.5]Max. 1,000 [39]
2" pipe schedule 5 ... 16030 [1.181]20 [0.787]2.5 [0.098]2.5 [0.098]Max. 800 [31.5]Max. 1,000 [39]