LUDWIG SCHNEIDER Wake-up frequency calculation

Application

The wake-up frequency calculation of the thermowell can be used

as a static and dynamic response relative to the operating

temperature and pressure.Mathematical proof of strength.

Special function

Calculated according to the wake-up frequency of ASME PTC 19.3

TW-2016, used for standard bar hot sleeve

Pipe as engineering service

It is possible to make suggestions for structural changes of

thermowells that exceed the allowable stress limit

Nozzle inner diameter

Nozzle height (shield length)

Inner diameter and wall thickness of the pipe/container

Description

SI unit Imperial Other

Flow

Medium density

Temperature

Pressure1）Dynamic viscosity

m/s

kg/m³

℃

bar

m㎡/s

ft/s

Ib/ft³

°F

psi

ft/1000s

-

-

-

-

cP

1) ASME PTC 19.3 TW-2016 is optional

ASME PTC 19.3 TW-2016 is used for solid drill pipe blanks with

tapered, straight or stepped designs Material thermowell, such as

JW20, JW35, JW40, JW45 and JW50, or made of forgings

The process data required to perform calculations according to ASME

PTC 19.3 TW-2016 are as follows:

Wake-up frequency calculation

Solid processed thermowell. Generally, according to ASME PTC 19.3 TW-2016, Rodriguez does not

provide any responsibility for the calculation of results.

For suggestions regarding structural changes beyond the allowable

stress limit, the following additional information is required:

Rodriguez warrants that the calculation is performed in accordance

with ASME PTC 19.3 TW-2016. end user

Responsible for the consistency between the actual process data and

the data on which the calculation is based.

What guarantee. The results are informative.

LUDWIG

SCHNEIDER Wake-up frequency calculation

LUDWIG DATA

TEL:400-860-9760

www.Ludwig-Schneider.com.cn

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罗德玮格仪表唤醒频率计算型号FT60

Basic information about ASME PTC 19.3 TW-2016

ASME PTC 19.3 TW-2016 is divided into dynamic and static calculation results.

For low-density gases, the frequency limit is usually rmax = 0.8. For other gaseous media, stable operation around the on-line resonance

within the range of r=0.4...0.6 is not allowed. For liquid media, in many applications,

Usually, the newly introduced online resonance limit frequency rmax = 0.4 is used.

Online resonance:

r = 0.5 (drag oscillation)

Main resonance:

r = 1 (lift oscillation)

rmax rmax

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 r=fs/fn

Section 6-8.2:

Sections 6-8.3 and 6-8.4:

Low density gas NSC> 2.5 nd Re <105

Cyclic stress condition

All other situations:

0.4

0.4

0.8

0.6 0.8

The static results of ASME PTC 19.3 TW-2016 are produced by the maximum allowable process pressure (depending on the process temperature and

the geometry of the thermowell) and the bending stress in the root area of the thermowell. The bending stress is

It is caused by the incident flow on the thermowell and depends on the shielding length of the flange nozzle.

Is NSC>2.5; The NSC of the fluid is usually less than 2.5.

Whether the frequency ratio r <0.8 can also be used as the evaluation limit for other process media depends on the allowable stress in the

thermowell material relative to the actual stress at resonance. In addition, assess the effect of thermowell material on bending fatigue

The Scruton number NSC in the calculation depends on the inherent damping coefficient, the density of the thermowell material, the process

medium, and the tip and aperture of the thermowell.

The evaluation of dynamic results is carried out using the damping factor NSC (Scruton number NSC is directly related to the allowable frequency

ratio rmax from the wake-up frequency fs to the natural frequency fn). After simplification, for gaseous media, the characteristic value

The influence of strain is clamped in the thermowell area.

LUDWIG


LUDWIG DATA

TEL:400-860-9760


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When the allowable frequency ratio rmax is exceeded,

use structural changes to remedy

By exceeding the maximum allowable limit frequency rmax

of "series" or main resonance, the following structure can be

solved variety:

a) Shorten the insertion length

This is the most effective way to increase the frequency ratio r

(also recommended by ASME PTC 19.3 TW-2016 method).

b) Increase the root diameter

By increasing the tooth root diameter, the natural frequency fn

will increase, thereby optimizing the frequency ratio r。

c) Increase the tip diameter

By increasing the tip diameter, the vortex shedding frequency

fs is reduced, thereby optimizing the frequency ratio r.

d) Support collar

e) ScrutonWell® design

Calculate ScrutonWell® design according

to ASME PTC 19.3 TW-2016

Maximum allowable pressure load under the original stem size

Maximum allowable bending load after the stem size is modified

Since the damping of the oscillation exceeds 90%, there is no

need for the dynamic part of the wake-up frequency calculation

Jw10 thermowell designed by ScrutonWell®

For prefabricated (welded pipe) thermowells, ASME PTC

19.3 TW-2016 does not apply.Please contact Rodriguez

representative to provide calculations based on

Dittrich/Klotter.

1) ASME, Journal of Ocean and Mechanics and Articulated Engineering, November 2011,

Volume 133/041102-1

Point 6-7-(e). According to customer requirements,

support ring can be used and designed to be connected to

the process

Thermowell, however, this is beyond the scope of ASME

PTC 19.3 TW-2016. Operator is responsible

There is an interference fit between the support ring and

the installed pipe, ASME PTC 19.3 TW-2016

Rodriguez generally does not provide guarantees for

support ring solutions!

Support rings or other support methods are not within the

standard range. It is generally not recommended to use a

support ring because only

Piece interference fit. Will be designed according to ASME

PTC 19.3 TW-2016 design and calculation standards

Support the collar firmly in the nozzle, which may mean

that the collar needs to be reworked.

Rework. Rodriguez ScrutonWell® design has passed the

independent laboratory TÜVSÜDNEL

For more information, see data sheet SP 05.16

(Glasgow) and the Institute of Mechanics and Fluid

Dynamics (Freiberg University of Technology) for testing

and

Or used in welding or threaded connection process. This

design can reduce the oscillation amplitude by more than

90% 1),

Recognized.

ScrutonWell® design can be used for integral processing

thermowells with flange connection, Vanstone design

And thermowells can be installed easily and quickly

without expensive and time-consuming on-site

LUDWIG


LUDWIG DATA

TEL:400-860-9760


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No

No

Yes

Yes

No

Yes

Yes

No

No

Yes

Perform standard wake-up frequency calculation according

to ASME PTC 19.3 TW-2016

This simplified flow chart shows step by step the requirements

according to the ASME PTC 19.3 TW-2016 implementation standard.

The process of wake frequency calculation. The graph only

addresses the failure frequency ratio. About possible wrong

generation For the complete list of codes, please refer to

Rodriguez's operating instructions. Due to the change of

thermowell design and the combination of various process

parameters, not all wake up Frequency calculations can follow

this standard procedure. If the steps shown in the diagram do

not make you a satisfactory result, please contact Rodriguez

sales representative For support, as a separate engineering

solution may be required.

meets the

ASME PTC 19.3 TW-2016


Stellite

Cover layer, rough surface,

Support ring, spiral ridge design,

Stepped hole or specified

Different handle design?

TW is not here

PTC 19.3 TW-2016

In the range

Please contact your

Rodriguez sales

representative for support

Support collar or

ScrutonWell® design

according to

ASME PTC 19.3 TW-2016


Did the result pass?

suggested

Unsupported

Length (L)>Nozzle protrusion+

Wall thickness+

2 inches (50mm)


Unsupported length

Change to Lopt

And recalculate

Caveat!

If there is a "loop situation",

Please contact your Rodriguez

sales representative for

support。

Enlarge the tip and/

Or root diameter and recalculate



ends TW passed

LUDWIG


LUDWIG DATA

TEL:400-860-9760


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Plan the details

Determine the position of the first support ring

The position of the thermowell support ring will be calculated as:

Nozzle projection-1 inch (25.4mm)

E.g:

14 inch (355.6mm) nozzle protrusion. The first support collar is

located 13 inches from the flange face (330.2mm).

The protruding length of the nozzle is defined as the length from

the outer diameter of the pipe/pipe to the height of the fitting

(flange surface or short pipe, etc.).

Determine the number and location of support rings

If the location of the first support ring is less than 5 inches (127 mm),

only one support ring is needed.

If the location of the first support ring is 5 inches (127 mm) or more,a second

Support ring, and the position of the first support ring divided by 2.

If the nozzle length is greater than 30 inches (762 mm)

Please consult your Rodriguez sales representative.

Example 1-Two support ring nozzles are 14 inches (356 mm) in length.

Support ring 1 is located 14 inches (356 mm)-1 inch (25.4 mm) = 13 inches (330 mm).

Since this number is greater than 5 inches (127 mm), two support rings are required.

So 13 inches (330 mm) / 2 = 6.5 inches (165 mm).

The support ring 2 is located at 6.5 inches (165 mm).

Example 2-A support ring nozzle length is 4.5 inches (114 mm).

Support ring 1 is located 4.5 inches (114 mm)-1 inch (25.4 mm) = 3.5 inches (89 mm).

Since this number is less than 5 inches (127 mm), a support ring will be required.

Nozzle projection

Nozzle projection

length

Support collar 2

Support collar 2

LUDWIG


LUDWIG DATA

TEL:400-860-9760


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NPS Unit Support ring outer diameter

SCH.10 SCH.40 SCH.STD SCH.80 SCH.XS SCH.160 SCH.XXS

1" inch 1.107 1.059 1.059 0.967 0.967 0.825 0.609

mm 28.1 26.9 26.9 24.6 24.6 21.0 15.5

1 ½" inch 1.692 1.620 1.620 1.510 1.510 1.348 1.110

mm 43.0 41.1 41.1 38.4 38.4 34.2 28.2

2" inch 2.167 2.077 2.077 1.949 1.949 1.697 1.513

mm 55.0 52.8 52.8 49.5 49.5 43.1

NPS Unit Recommended support ring root diameter

SCH.10 SCH.40 SCH.STD SCH.80 SCH.XS SCH.160 SCH.XXS

1" inch 0.938 0.875 0.875 0.813 0.813 0.688 0.500

mm 23.8 22.2 22.2 20.6 20.6 17.5 12.7

1 ½" inch 1.500 1.375 1.375 1.250 1.250 1.125 1.000

mm 38.1 34.9 34.9 31.8 31.8 28.6 25.4

2" inch 1.875 1.750 1.750 1.625 1.625 1.500 1.250

mm 47.6 44.5 44.5 41.3 41.3 38.1

12.7 mm (½")

“A” “A”

Typical installation through nozzle

≥ 45 mm (1.75")

See "Details”

deal with

Tap

er in

sertio

n le

ng

th

Details

Process fit between support ring

and nozzle inner diameter

Four point support collar

“ A”-“ A”Section

Determine the outer diameter of the support ring according to the pipe size and schedule

Determine the recommended maximum root diameter based on nozzle size and schedule

LUDWIG


LUDWIG DATA

TEL:400-860-9760


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Description Tapered and straight design Stepped design

At the lowest limit Maximum

Insert length L

Aperture d

Tip diameter B

Taper ratio B/A

B ratio ratio B / A = 12.7 mm

B ratio ratio B / A = 22.2 mm

Aperture ratio d/B

Cross-sectional area ratio L/B

Length ratio Ls/L

Minimum wall thickness (B-D)/ d

63.5 mm (2.5") 609.6 mm (24") 127 mm (5") 609.6 mm (24")

3.175 mm (0.125") 20.9 mm (0.825") 6.1 mm (0.24") 6.7 mm (0.265")

9.2 mm (0.36") 46.5 mm (1.83") - -

0.58 1 - -

- - 0.5 0.8

- - 0.583 0.875

0.16 0.71 - -

2 - 2 -

- - 0 0.6

3 mm (0.12") - 3 mm (0.12") -

Mark According to ASME

PTC 19.3 TW-2016

Rodriguez

Data sheet

Insert length

Aperture

Tip diameter

Tooth root diameter

L U

d B

B V

A Q

Tag no. T P v rho Dyn. Viscosity

cPmodel

Size mmmaterial

in m/s in kg/m³ L Ø d Ø A Ø B Tt NID NL

TW-0301 220 1.5 23.6 2.4 0.013 JW10 250 8.5 25 19 6.4 38.3 220 1.4435

TW-0303 220 1.5 25.7 2.0 0.017 JW10 250 8.5 25 19 6.4 38.3 220 1.4435

TW-0305 235 10 19.6 6.1 0.015 JW10 250 8.5 25 19 6.4 38.3 220 1.4435

TW-0307 220 10 13 8.9 0.014 JW10 355 8.5 25 19 6.4 38.3 220 1.4571

TW-0309 235 30 8.9 28.3 0.013 JW10 355 8.5 25 19 6.4 38.3 220 1.4571

TW-0311 400 31.5 31.9 10.1 0.017 JW10 355 8.5 25 19 6.4 38.3 220 1.4571

ASME PTC 19.3 TW-2016 design code

At the lowest limit Maximum

If the thermowell size exceeds ASME PTC 19.3 according to

customer requirements or for specific applications

According to the requirements of TW-2016, the calculation

results can only be used to provide information.

Therefore, Rodriguez cannot Guarantee.

Provide calculation data

The example in the following table shows how process and geometric data should be provided as an excel spreadsheet to

Rodriguez for further electronic processing.

The sample table includes calculation data for 6 measuring points

Description

Tag No. Measuring point number

T Temperature

P Pressure

V Flow

rho Process the density of the mediumRodriguez representative office in China

Rodriguez Automation Instrumentation (Guangzhou) Co., Ltd.

Luode Weige International Trade (Shanghai) Co., Ltd.

Phone: 400-860-9760

Email: [email protected]

Website: www.Ludwig-Schneider.com.cn

LUDWIG

SCHNEIDER

LUDWIG


LUDWIG DATA

TEL:400-860-9760


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LUDWIG

SCHNEIDER


LUDWIG SCHNEIDER Wake-up frequency calculation

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