Specifications
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Siemens FI 01 · 2015 US Edition
Temperature Measurement
SITRANS TS500
Technical description
2
Thermowell calculation
Properly applied load diagrams will provide a sufficient degree
of safety for the most common thermowell configurations.
However, there are cases in which operating conditions deviate
too greatly from standard parameters. In this case, a customized
thermowell calculation may be required.
Another reason for doing this calculation is the fact that flowing
media can create turbulence at the tip of the thermowell under
certain conditions. The thermowell will then vibrate and may
even be destroyed if not configured correctly. This is the most
frequent cause of thermowell bailure.
SIEMENS offers the two recognized methods for calculating the
thermowell:
• DIN/Dittrich method
• ASME/Murdock method
This method also takes into account turbulence formation on
a mathematical level.
Both methods provide a high degree of safety with regard to
thermowell configuration, however, they do not provide a guar-
antee against breakdowns.
Materials
Where cost-intensive materials are used with flange thermowells, cost savings can be achieved by using a so-called flanged wheel.
A thin disc of the material which comes into contact with media is applied prior to the flange (ordinary stainless steel).
Material descriptions/Standards comparison Max. tem-
perature
[°C (°F)]
(unloaded)
Properties Applications
Mat. No.: AISI/Trade
name:
EN 10028-2: Description
1.4404 or
1.4435
AISI 316 L X2CrNiMo17-12-2 Austenitic stain-
less steel
600
(1112)
Good acid resistance, resistant
against grain boundary corro-
sion
Chemical industry, waste treat-
ment, paper and cellulose
industry, food industry
1.4571 AISI 316 Ti X6CrNiMoTi 17 12-2 Austenitic stain-
less steel
800
(1472)
Good acid resistance, resistant
against grain boundary corro-
sion (supported by TI portion)
Chemical industry, textile
industry, paper and cellulose
industry, water supply, food
and pharmaceuticals
1.5415 A 204 size A 16Mo3 Carbon steel,
high-alloy
500
(932)
Resistant at higher tempera-
tures, well suited for welding
Steam turbines, steam lines,
water pipes
1.7335 A 182 F11 13CrMo4-5 Carbon steel,
high-alloy
540
(1004)
Resistant at higher tempera-
tures, well suited for welding
Steam turbines, steam lines,
water pipes
1.4841 SS 314 X15CrNiSi25-20 Austenitic heat-
resistant stain-
less steel
1150
(2102)
Resistant at high tempera-
tures, also resistant against
low-O
2
and nitrogen-contain-
ing gases.
Flue gas, petrochemical indus-
try, chemicals industry, power
plants
1.4762 446 X10CrAl24 Ferritic heat-
resistant steel
1150
(2102)
Resistant at high tempera-
tures, in oxidizing and reduc-
ing sulphur-containing
atmosphere
Chemical industry, power
plants, steel industry, waste
gas treatment
2.4816 Inconel 600 NiCr15Fe Nickel-Chrome
alloy
1150
(2102)
Resistant at high tempera-
tures, resistant against chlo-
rine-induced cold crack
corrosion
Chemical industry, petrochem-
ical industry, food industry
1.4876 Incoloy 800 X10NiCrAlTi32-21 Austenitic heat-
resistant stain-
less steel
1100
(2012)
Excellent resistance against
oxidation and carbonization at
high temperatures, good cor-
rosion resistance
O&G industry, waste gas treat-
ment, power plants (steam
boiler, heat exchanger), appli-
cations using aggressive fluids
2.4819 Hastelloy C 276 NiMo16Cr15W Nickel-Chrome-
Molybdenum
alloy
1100
(2012)
Resistant at high tempera-
tures, in oxidizing and reduc-
ing atmosphere, resistant
against pitting and crevice cor-
rosion, good corrosion resis-
tance after welding
Chemicals industry, paper and
cellulose industry, waste treat-
ment, waste incinerators, emis-
sions controls, shipbuilding
and offshore industry
2.4360 Monel 400 NiCu30Fe Nickel-Copper
alloy
500
(932)
Excellent corrosion resistance,
particularly against chlorine-
induced cold crack corrosion
Chemical industry, offshore
industry, nuclear technology,
petrochemical industry
© Siemens AG 2015