Endress+Hauser Thermophant T TTR31 Operating Manual page 33

TTR31, TTR35 Technical data
maximum permitted static operating pressure is lower at greater insertion lengths due to the
increased bending load caused by the flow. The calculation assumes the maximum permitted
medium velocity for the respective insertion length (see diagram below).
"
Caution!
The maximum process pressure for the conical metal-metal process connection (see Fig. 4,
item MB) is 16 bar = 1.6 MPa (232 psi)!
Permitted flow velocity depending on the insertion length.
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Fig. 16: Permitted flow velocity
L = insertion length, during flow
v = flow velocity
Medium: ----- air; - - - - - water
The permitted flow velocity is the minimum from resonance velocity (resonance distance 80%)
and load or buckling caused by flow, which would lead to failure of the thermometer tube or to
exceedance of the safety factor (1.9). Calculation was performed for the specified limit operating
conditions of 200°C (392°F) and ≤10 MPa (1450 PSI) process pressure.
Endress+Hauser 33