Upload
others
View
11
Download
0
Embed Size (px)
Citation preview
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
///////
20
20
YE
AR
00
50
7-0
52
7-1
01
3 C
h V
ers
ion
///////
1/7
LUDWIG
SCHNEIDER
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
SCHNEIDER Wake-up frequency calculation
LUDWIG DATA
TEL:400-860-9760
www.Ludwig-Schneider.com.cn
///////
20
20
YE
AR
00
50
7-0
52
7-1
01
3 C
h V
ers
ion
///////
2/7
LUDWIG
SCHNEIDER
罗德玮格仪表 唤醒频率计算型号FT60
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
SCHNEIDER Wake-up frequency calculation
LUDWIG DATA
TEL:400-860-9760
www.Ludwig-Schneider.com.cn
///////
20
20
YE
AR
00
50
7-0
52
7-1
01
3 C
h V
ers
ion
///////
3/7
LUDWIG
SCHNEIDER
罗德玮格仪表 唤醒频率计算型号FT60
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
Wake-up frequency calculation
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
Wake-up frequency calculation
Did the result pass?
suggested
Unsupported
Length (L)>Nozzle protrusion+
Wall thickness+
2 inches (50mm)
Did the result pass?
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
Did the result pass?
Wake-up frequency calculation
ends TW passed
LUDWIG
SCHNEIDER Wake-up frequency calculation
LUDWIG DATA
TEL:400-860-9760
www.Ludwig-Schneider.com.cn
///////
20
20
YE
AR
00
50
7-0
52
7-1
01
3 C
h V
ers
ion
///////
4/7
LUDWIG
SCHNEIDER
罗德玮格仪表 唤醒频率计算型号FT60
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
SCHNEIDER Wake-up frequency calculation
LUDWIG DATA
TEL:400-860-9760
www.Ludwig-Schneider.com.cn
///////
20
20
YE
AR
00
50
7-0
52
7-1
01
3 C
h V
ers
ion
///////
5/7
LUDWIG
SCHNEIDER
罗德玮格仪表 唤醒频率计算型号FT60
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
SCHNEIDER Wake-up frequency calculation
LUDWIG DATA
TEL:400-860-9760
www.Ludwig-Schneider.com.cn
///////
20
20
YE
AR
00
50
7-0
52
7-1
01
3 C
h V
ers
ion
///////
6/7
LUDWIG
SCHNEIDER
罗德玮格仪表 唤醒频率计算型号FT60
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
SCHNEIDER Wake-up frequency calculation
LUDWIG DATA
TEL:400-860-9760
www.Ludwig-Schneider.com.cn
///////
20
20
YE
AR
00
50
7-0
52
7-1
01
3 C
h V
ers
ion
///////
7/7
LUDWIG
SCHNEIDER
罗德玮格仪表 唤醒频率计算型号FT60