The long awaited PTC TW is a completely new standard that ASME responded to changing industry demands for a more comprehensive set of. thermowell failures in their systems, but ASME PTC had been the standard by which most thermowells were designed. Color enhanced smoke trail . Since then, ASME PTC TW has been applied successfully worldwide in all industries whose processes are subject to high loads.
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What Has Changed with the Revision of the ASME PTC TW Standard?
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Our portfolio can be seen here. This standard remained unchanged for more than 20 years.
What Has Changed with the 2016 Revision of the ASME PTC 19.3 TW Standard?
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This edition of the standard only considered the more frequently occurring vibrations at right angles to the flow direction. Chemical Safety Board; Picture: Scientific Image of the Day: Such an in-line resonance was not considered in the original calculation basis from In there was a serious accident at the Japanese nuclear power plant in Monju.
The revision provides some clearer asmee more-detailed definitions. This article is protected by copyright.
It stands as the benchmark: The amendments contained within it relate to the following three aspects. It was caused by the rupture of a thermowell due to turbulence: KG Klingenberg a.
The provisions that it contained for the wake frequency calculation were based on J. As a consequence of the Monju incident, the ASME standard from was completely revised and ptd result was published in Furthermore, the process medium must not adversely affect the fatigue strength of the thermowell material. Infos can be found under www. The vibration direction of the tube was parallel to the flow direction of the medium in the pipe.
How this translates into figures is shown in the table see picture gallery. As a result, passing through the in-line resonance 19.33 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.
Dos Santos International; Picture: This applies, for example, to companies in the oil, gas and chemical industries.
You want to use it for your own purpose? News from process industries from all over the world. With this deal, a wide range of PVA polymer grades will be made available in the pharma market.
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 or damage to the plant. Here, the permissible flexural fatigue stress must not be exceeded during the cumulative number of awme of 10 11 cycles.
As expected passing through this in-line resonance is the responsibility of the plant owner.