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WIKA · Temperature measurement · Family TW15

Threaded thermowell

Head design: hexagon, milled wrench flats or round with hexagon
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

  • International standard
  • Possible thermowell designs: tapered, straight or stepped
Identification
ModelTW15
SubcategoryThreaded thermowell
Process conditions
Process connection
1 NPT male threadM27 x 21 BSPWG ½ BM20 x 1.5½ NPT male thread¾ NPT male threadG ¾ B½ BSPT¾ BSPT½ BSPP¾ BSPPM20 x 1,51/2 NPT male thread3/4 NPT male threadG 1/2 female thread1/2 BSPT3/4 BSPT1/2 BSPP
Materials
Thermowell materialStainless steel 316/316L, Stainless steel 304/304L, A105, Stainless steel 1.4571, Alloy C4, Alloy C276, Alloy 400, Titanium grade 2, Materials per ASTM specifications
Operating environment
Weight0.2 kg
Certifications and approvals
Certifications
2.2 test report3.1 inspection certificate
Additional details
Probe diameter6.6 mm
ThermowellYes
Thermowell formtapered, straight, stepped
Datasheet languagesEN
Tables from datasheet
Basic information
Thermowell form■ Tapered ■ Straight ■ Stepped
Version
DesignTW15-HHexagon
DesignTW15-RMilled wrench flats
DesignTW15-MRound with hexagon
Material (wetted)■ Stainless steel 316/316L ■ Stainless steel 304/304L ■ A105 ■ Stainless steel 1.4571 ■ Alloy C4 ■ Alloy C276 ■ Alloy 400 ■ Titanium grade 2 ■ Materials per ASTM specifications → Other materials on request
Process connection
Type of process connection■ ½NPTmale thread ■ ¾NPTmale thread ■ 1 NPT male thread
→ Other threads on request
Connection to thermometer■ ½NPTfemale thread ■ G½female thread
→ Other threads on request
Bore size■ Ø6.6 mm[0.26 in] ■ Ø8.5 mm[0.36 in]
→ Other bore sizes on request
Insertion length U■ 50 mm[1.97] ■ 75 mm[2.95] ■ 100 mm[2.5 in] ■ 150 mm[5.9 in] ■ 200 mm[7.87 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]
→ Weitere Einbaulängen auf Anfrage
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]
→ Other tip thicknesses on request
Suitable stem length l 1 (dial thermometer)
Connection design S, 4, 4.1, 5, 6.1, 6.2, 6.3 and 7Parallel threadl 1 = U + H - 10 mm[0.4 in]
Tapered threadl 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 calculationThe 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 seeTechnical information IN 00.15'Wake frequency calculation'.
Process connec- tionHead designDimensions in mm[in]Weight in kg [lbs]
Hexagon or round with hexagonRound with wrench flats
MetricImperialMetricImperialNØ QØVØ BHU=2½inU=7½in
½NPTHEX 27HEX1.125Ø34mm with SW28Ø1.375 in with SW1⅛in■ ½NPT ■ G½ ■ M20 x 1,516 [0.625]13 [0.512]■ 6.6 [0.260] ■ 8.5 [0.355]45 [1.772]0.20 [0.441]0.36 [0.794]
¾NPTHEX 27HEX1.125■ ½NPT ■ G½ ■ M20 x 1,522 [0.866]16 [0.625]■ 6.6 [0.260] ■ 8.5 [0.355]45 [1.772]0.31 [0.683]0.56 [1.235]
1 NPTHEX 36HEX1.375■ ½NPT ■ G½ ■ M20 x 1,527 [1.063]19 [0.750]■ 6.6 [0.260] ■ 8.5 [0.355]45 [1.772]0.50 [1.102]0.84 [1.852]
G ½ BHEX 27HEX1,125--■ ½NPT ■ G½ ■ M20 x 1,516 [0.625]13 [0.512]■ 6.6 [0.260] ■ 8.5 [0.355]45 [1.772]0.20 [0.441]0.36 [0.794]
G¾BHEX 32HEX1,259--■ ½NPT ■ G½ ■ M20 x 1,522 [0.866]16 [0.625]■ 6.6 [0.260] ■ 8.5 [0.355]45 [1.772]0,35 [0.772]0,6 [1.323]
M20 x 1,5HEX 27HEX1,125--■ ½NPT ■ G½ ■ M20 x 1,516 [0.625]13 [0.512]■ 6.6 [0.260] ■ 8.5 [0.355]45 [1.772]0,20 [0.441]0,36 [0.794]
M27 x 2HEX 32HEX1,259--■ ½NPT ■ G½ ■ M20 x 1,522 [0.866]16 [0.625]■ 6.6 [0.260] ■ 8.5 [0.355]45 [1.772]0,35 [0.772]0,6 [1.323]
½BSPTHEX 27HEX1,125--■ ½NPT ■ G½ ■ M20 x 1,516 [0.625]13 [0.512]■ 6.6 [0.260] ■ 8.5 [0.355]45 [1.772]0,20 [0.441]0,36 [0.794]
¾BSPTHEX 32HEX1,259--■ ½NPT ■ G½ ■ M20 x 1,522 [0.866]16 [0.625]■ 6.6 [0.260] ■ 8.5 [0.355]45 [1.772]0,35 [0.772]0,6 [1.323]
1 BSPWHEX 36HEX1,375--■ ½NPT ■ G½ ■ M20 x 1,527 [1.063]19 [0.750]■ 6.6 [0.260] ■ 8.5 [0.355]45 [1.772]0,50 [1.102]0,84 [1.852]
½BSPPHEX 27HEX1,125--■ ½NPT ■ G½ ■ M20 x 1,516 [0.625]13 [0.512]■ 6.6 [0.260] ■ 8.5 [0.355]45 [1.772]0,20 [0.441]0,36 [0.794]
¾BSPPHEX 36HEX1,375--■ ½NPT ■ G½ ■ M20 x 1,522 [0.866]16 [0.625]■ 6.6 [0.260] ■ 8.5 [0.355]45 [1.772]0,50 [1.102]0,84 [1.852]