ASME PTC TW was written to replace ASME PTC following some catastrophic failures in non-steam service, these thermowells passed the. Since then, ASME PTC TW has been applied successfully worldwide in all industries whose processes are subject to high loads. standard, known as ASME PTC TW (“TW” for thermowell), is over 40 pages due to the explanations of theory and the sheer complexity of the process.
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ts Receive 15 new engineering projects per week — get them easily delivered into your mailbox. It stands as the benchmark: The revision provides some clearer and more-detailed definitions. The provisions that it contained for the wake frequency calculation were based on J.
This standard remained unchanged for more than 20 years. In there was a serious accident at the Japanese nuclear power plant in Monju. It was caused by the rupture of a thermowell due to turbulence: The vibration direction of the tube was parallel to the flow direction ;tc the medium in the pipe. Such an in-line resonance was not considered in the original calculation basis from This edition of asne standard only considered the more frequently occurring vibrations at right angles to the flow direction.
As a consequence of the Monju incident, the ASME standard from was completely revised and the result was published in This applies, for example, to companies in the oil, gas and chemical industries. The amendments contained within it relate to the following three aspects. As a result, passing through the in-line resonance is possible, if the process medium is gaseous and the range of the in-line resonance does not fall within the continuous operation of the plant.
What Has Changed with the Revision of the ASME PTC TW Standard?
As expected passing through this in-line resonance is the responsibility of the plant owner. Here, the permissible flexural fatigue stress must not be exceeded during the cumulative number of vibrations of 10 11 cycles. How this translates into figures is shown in the table see picture gallery. Furthermore, the process medium must not adversely affect the fatigue strength of the thermowell material. For the case, which cannot be completely eliminated, of a thermowell rupture resulting from in-line resonance, the standard demands safety provisions to prevent severe injury to personnel 19.3 damage to the plant.
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What Has Changed with the 2016 Revision of the ASME PTC 19.3 TW Standard?
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