TW55

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WIKA · Temperature measurement · Family TW55

Thermowell for weld-in or with flange

Name: Thermowell for weld-in or with flange
Brand: WIKA
SKU: TW55

Version per DIN 43772 form 4, 4F

3.1 inspection certificate2.2 test report

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Description

Each thermowell 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, and those with flange connections.

Special features

Version per DIN 43772
Model TW55-6: Form 4 to weld-in Model TW55-7: Form 4F with flange
For highly corrosion-resistant coating (model TW55-7)

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Your configuration

Thermowell styleForm 4 (welding connection)
Bar diameter [Bd or F2]24 mm
Connection to thermometer [N]M18 x 1,5 female
Bore size [B or d1]0.276 inch (7.0 mm)
Flange sizeWithout
Pressure ratingWithout
Flange faceWithout
MaterialStainless steel 1.4571
Total length [L]—
Insertion length [U1]0
Tapering length [U]—
CertificatesWithout

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Identification

Model	TW55
Subcategory	Thermowell

Process conditions

Process connection

EN 1092-1DIN 2527ASMEWeld-in (TW55-6)Flange (TW55-7)M14 x 1.5 female threadM18 x 1.5 female threadG½ female threadG¾ female threadweld-inflange

Materials

Thermowell material

1.4571, 316/316L, P250GH, 1.5415, 1.7380, Stainless steel 1.4571, Stainless steel 316/316L, Steel P250GH, Steel 1.5415, Steel 1.7380

Certifications and approvals

Certifications

3.1 inspection certificate2.2 test report

Additional details

Thermowell	Yes
Thermowell form	4F
Datasheet languages	EN

Tables from datasheet

Models TW55-6 and TW55-7
Designs per DIN 43772	■ Design TW55-6: Form 4 to weld-in ■ Design TW55-7: Form 4F with flange, for highly corrosion-resistant coatings
Thermowell materials	■ Stainless steel 1.4571 ■ Stainless steel 316/316L ■ Steel P250GH (former designation: 1.0460, C22.8) ■ Steel 1.5415 ■ Steel 1.7380
Process connection 1)
Thermowell outer diameter (bar diameter)	■ Ø18 mm[0.71 in] ■ Ø24 mm[0.94 in] ■ Ø26 mm[1.02 in] ■ Ø32 mm[1.26 in]
Flanges to valid national or international standards	■ EN 1092-1 ■ DIN 2527 ■ ASME
Connection to thermometer	■ M14 x 1.5 female thread ■ M18 x 1.5 female thread ■ G½female thread ■ G¾female thread
Bore size	■ Ø3.5 mm[0.14 in] ■ Ø7mm[0.28 in] ■ Ø9mm[0.35 in] ■ Ø11 mm[0.43 in]
Insertion length U 1 , cone length U and overall length L	For design combinations, see table page 4
Coating
PFA	■ Layer thickness min.0.4mm ■ Layer thickness min.0.6mm
ECTFE (Halar ® )	Layer thickness min.0.6mm
Max. process temperature, process pressure	Depending on ■ Load diagram DIN 43772 ■ Thermowell design - Dimensions - Material - Flange pressure rating - Coating ■ Process conditions - Flow rate - Medium density
Wake frequency calculation	For critical applications, is recommended in accordance with Dittrich/Klotter or ASME PTC 19.3 TW-2016 as aWIKA engineering service For further information, see Technical information IN 00.15 'Wake frequency calculation'.

Dimensions in mm[in]	Weight in kg [lbs]
L	U	U 1	DN 25, PN 40	DN 50, PN 40
200 [7.87]	65 [2.56]	130 [5.12]	1.9 [4.19]	3.8 [8.38]
260 [10.24]	125 [4.29]	190 [7.48]	2.1 [4.63]	4.0 [8.82]
410 1) [16.14]	275 [10.83]	340 [13.39]	2.3 [5.07]	4.2 [9.26]

Dimensions in mm[in]

N	Ø d 1	Ø F 2	Ø F 3	H 1	H 2
M14 x 1.5	3.5 [0.14]	18 [0.71]	9 [0.35]	16 [0.63]	13 [0.51]
M18 x 1.5	7 [0.28]	24 [0.94]	12.5 [0.49]	16 [0.63]	13 [0.51]
G½	7 [0.28]	26 [1.02]	12.5 [0.49]	19 [0.75]	15 [0.59]
G½	9 [0.35]	26 [1.02]	15 [0.59]	19 [0.75]	15 [0.59]
G¾	11 [0.43]	32 [1.26]	17 [0.67]	22 [0.87]	17 [0.67]

Dimensions in mm[in]	Weight in kg [lbs]
L	U
110 [4.33]	65 [2.56]	0.24 [0.53]
110 [4.33]	73 [2.87]	0.23 [0.51]
140 [5.51]	65 [2.56]	0.34 [0.75]
170 [6.69]	133 [5.24]	0.34 [0.75]
200 [7.87]	65 [2.56]	0.54 [1.19]
200 [7.87]	125 [4.92]	0.45 [0.99]
260 [10.24]	125 [4.92]	0.65 [1.43]
410 2) [16.14]	275 [10.83]	0.92 [2.03]

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Connection design	Stem length l 1
	Without neck tube	With neck tube
S, 4 or 5	l 1 = L - 10 mm[0.4 in]	-
2	l 1 = L - 30 mm[1.2 in]	-
3	-	l 1 = L + M- 10 mm[0.4 in] 1)

Connection design	Stem length l 1
	Without neck tube	With neck tube
E	l 1 = L - 10 mm[0.4 in]	-
3	-	l 1 = L + M- 10 mm[0.4 in] 1)

Thermowell	Insertion length	Cone length	Overall length
Model	U 1	U	L
TW55-6 (Form 4 to weld-in)	-	■ 65 [2.56] ■ 73 [2.87] ■ 125 [4.92] ■ 133 [5.24] ■ 275 [10.83]	■ 110 [4.33] ■ 140 [5.51] ■ 170 [6.69] ■ 200 [7.87] ■ 260 [10.24] ■ 410 [16.14]
TW55-7 (form 4F with flange)	■ 130 [5.12] ■ 190 [7.48] ■ 340 [13.39]	■ 65 [2.56] ■ 125 [4.92] ■ 275 [10.83]	■ 200 [7.87] ■ 260 [10.24] ■ 410 [16.14]

Flange standard	AARH in µinch	Ra in µm	Rz in µm
ASME B16.5	Stock finish	125 ... 250	3.2 ... 6.3	-
	Smooth finish	< 125	< 3.2	-
	RTJ	< 63	< 1.6	-
	Tongue/groove	< 125	< 3.2	-
EN 1092-1	Form B1	-	3.2 ... 12.5	12.5 ... 50
	Form B2	-	0.8 ... 3.2	3.2 ... 12.5
DIN 2527	Form C	-	-	40 ... 160
	Form E	-	-	< 16

Thermowell for weld-in or with flange

Description

Special features

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4 standard articles of family TW55