TW20

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WIKA · Temperature measurement · Family TW

Weld-in thermowell

Name: Weld-in thermowell
Brand: WIKA
SKU: TW20

Weld-in thermowell for welding sockets, suitable for high process loads in petrochemical industry and plant construction.

2.2 test report3.1 inspection certificate

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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

Different dimensions for standardised welding sockets
International standard
Possible thermowell forms: Design TW20-A: tapered Design TW20-B: straight Design TW20-C: stepped
Design TW20-A: tapered
Design TW20-B: straight
Design TW20-C: stepped

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Without3.1 Material certificate acc. EN 10204 with mill certificate (GB+G)

Your configuration

Thermowell styleTapered
Unit of measureMetric (mm)
Welding diameter26.7 mm (for 3/4 inch pipe)
Connection to thermometer [N]1/2 NPT female
Insertion length [U]100
Head length [H]45
MaterialStainless steel 316/316L
Bore size [B or d1]0.260 inch (6.6 mm)
Pressure ratingClass 3000
Root diameter [Q]19,0
Tip diameter [V or F3]16,0
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Identification

Model	TW20
Product family	TW
Subcategory	Weld-in thermowell

Process conditions

Process connection

½NPT female threadG½ female threadØ 26.7 mm [¾ in]Ø 33.4 mm [1 in]Ø 48.3 mm [1.5 in]Ø 6.6 mm [0.260 in]Ø 8.5 mm [0.355 in]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]800 mm [31.5 in]45 mm [1.75 in]250 mm [10 in]6.4 mm [0.25 in]Ø26.7mm [3/4in]

Materials

Thermowell material

Stainless steel 316/316L, Stainless steel 304/304L, A105, Stainless steel 1.4571, Other materials on request, Special materials

Operating environment

Weight

0.4 kg

Certifications and approvals

Certifications

2.2 test report3.1 inspection certificate

Additional details

Thermowell	Yes
Thermowell form	TW20-A: Tapered, TW20-B: Straight, TW20-C: Stepped
Datasheet languages	EN

Tables from datasheet

Basic information

Thermowell form
DesignTW20-A	Tapered
DesignTW20-B	Straight
DesignTW20-C	Stepped
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 connection	■ Ø26.7 mm[¾in] ■ Ø33.4 mm[1 in] ■ Ø48.3 mm[1.5 in]
	→ Other diameters on request
Connection to thermometer	■ ½NPTfemale thread ■ G½female thread
	→ Other threads on request
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]
	→ Other insertion lengths on request
Min. insertion length	Depending on the selected version
Max. insertion length 1)	800 mm[31.5 in]
Connection length H	45 mm[1.75 in]
Min. Connection length	Depending on the selected version
Max. Connection length	250 mm[10 in]
Tip thickness	6.4 mm[0.25 in] → Other tip thicknesses on request
Suitable stem lengths l 1 (dial thermometer) with tip thickness 6.4 mm[0.25 in]
Connection design S, 4, 4.1, 5, 6.1, 6.2, 6.3 and 7	Parallel thread	l 1 = U + H - 10 mm[0.4 in]
	Tapered thread	l 1 = U + H - 2 mm[0.08 in]
Connection design 2	l 1 = U + H - 30 mm[1.2 in]

Operating conditions

Max. process temperature, process pressure

Depending 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 P	N	Ø Q	ØV	Ø B	U = 100 mm[3.937 in]	U = 560 mm[22.047 in]
26.7 [¾]	■ ½NPT ■ G½	19 [0.750]	16 [0.625]	■ 6.6 [0.260] ■ 8.5 [0.355]	0.4 [0.882]	1.1 [2.425]
33.4 [1]	■ ½NPT ■ G½	25 [1.000]	19 [0.750]	■ 6.6 [0.260] ■ 8.5 [0.355]	0.6 [1.322]	1.9 [4.188]
48.3 [1.5]	■ ½NPT ■ G½	38 [1.496]	19 [0.750]	■ 6.6 [0.260] ■ 8.5 [0.355]	1.2 [2.646]	3.5 [7.716]

View all (6)

Overview of versions

TW10	Thermowell with flange
TW15/TW50	Threaded thermowell
TW20	Weld-in thermowell (for welding socket)
TW25	Weld-in thermowell (variable welding diameter)
TW30	Thermowell 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 size	Root diam- eter mm [inch] units SIZE ISO 14405  8015 Nur zur DR comments	Tip diam- eter www.wika.com D-63911 Klingenberg ALEXANDER WIEGAND SE & Co. KG Information sheets 1 / 1	Strake height	Strake depth	Scruton length 1)	Insertion length 1)
- 63 16 4 1 ± 0,1 ± 0,2 ± 0,3 ± 0,5 GER/ENG	Ø Q ISO	ØV DEKLI1_EN_A4M_T01 26.04.2023	Sh	Sw	SL	U
1" pipe schedule 5 ... 80	24 [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 ... 160	30 [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 ... 160	30 [1.181]	20 [0.787]	2.5 [0.098]	2.5 [0.098]	Max. 800 [31.5]	Max. 1,000 [39]

Weld-in thermowell

Description

Special features

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2 standard articles of family TW