Thermoacoustic pulsations caused by heat exchangers
15. May 2019, 9:00 a.m. CEST/ Speaker: Dr.-Ing. Christian Jansen
Fatigue failures of pipework can in many cases be traced back to elevated pressure pulsations. For applications utilizing rotating or reciprocating machinery the source of these pulsations is obvious. In these cases, pulsation and vibration studies are carried out to avoid acoustic resonances and pipeline vibrations. This is normally performed during the design and engineering phase or as part of an optimization project to increase the reliability and availability of an existing plant.
Flow-induced vibrations are a further source for fatigue issues at industrial plants. The vortex shedding and acoustic amplification at heat exchanger tubes and vessels is a prominent example for this. Knowing these issues, some effort is put into proper design to avoid this.
Quite unknown is the fact that a heat exchanger itself can under special conditions cause pulsations in the heated gas due to an effect called “thermoacoustic instability”. This effect has been observed at several gas metering stations and is considered as the root cause for a heavy fire in a gas metering station.
This webinar presents the theoretical background of pulsations caused by thermoacoustic instability. Furthermore, case studies are presented which demonstrate the measurement-based approach to analyze and solve these problems.
14. May 2019, 4 p.m. CEST/ Speaker: Sven Rechenberger, M.Sc.
Typical problems and planning errors
Blowdown systems used in the oil and gas industry, petrochemical plants, refineries and other large industrial plants, generate very high noise levels due to high mass flows and high pressure drops.
To comply with noise limits, ever more complex and expensive silencer systems are being designed. Nevertheless, there exist many cases where blowdown systems still generate unexpectedly high noise levels, resulting in delays and cost-intensive modifications. Experience shows that problems often arise due to simple planning mistakes.
In this webinar, we will discuss typical noise problems of blowdown systems with focus on the following questions:
Which are the three physical processes generating the majority of the noise? And why are two of these processes often overlooked?
Is it truly necessary to employ more and more complex silencers? Are there cost-effective alternatives to reduce high noise level?
Why does the maximum achievable noise reduction of a blowdown system depend on the requirements of the heat radiation study?
Why can high noise levels lead to a fracture and loss of containment on a blowdown system?
Pipeline Vibrations – Measurements under difficult conditions
08. April 2019, 10:00 Uhr CEST/ Speaker: Dr.-Ing. Patrick Tetenborg
Two case studies about elevated pipeline vibrations, special challenges and individual methods of resolution.
Our first case study deals with obvious vibrations occuring randomly during high volume flow in winter time at a grid gas manifold. The second case study is about elevated vibrations in the reactor bay of a chemical plant using a hyper compressor.
Based on these initial situations we present the challenges resulting from the problem, our proceeding of evaluating and detecting the cause, the possible mitigation measures and our final solution.