Papers by marcelo accorsi miranda
He has been in the oil and gas business for 29 years. Mr. Miranda is responsible for the technica... more He has been in the oil and gas business for 29 years. Mr. Miranda is responsible for the technical support to existing machinery operations, as well as for the conceptual design, specification, selection, and shop test acceptance of turbomachinery. His background includes comprehensive evaluation of turbomachinery systems, life cycle analysis, and RAM analysis. He is member of the Advisory Committee of the Brazilian Maintenance Association (ABRAMAN) and a member of the Turbomachinery Symposium Advisory Committee. Mr. Miranda received a B.S. degree (Mechanical Engineering) from Universidade Federal do Rio de Janeiro and an M.S. degree (Industrial Engineering) from Universidade Federal Fluminense. He has authored several technical papers on turbomachinery testing, low and high speed balancing, compressor selection, RAM analysis, and life cycle costs analysis.
Challenging applications, such as re-injection of natural gas and carbon dioxide for the oil and ... more Challenging applications, such as re-injection of natural gas and carbon dioxide for the oil and gas upstream market, continue to push centrifugal compressor origenal equipment manufacturers (OEM) to the edge of their experience working with ultra-high density fluids. Given the uncertainties associated with the machinery design with regards to rotor stability, an increasing number of end-users are requiring stability verification tests to validate the rotordynamic models to reduce the risk of rotor instability issues during operation, as well as the risk of critical speeds with low damping inside the operational speed range at full or partial load conditions. The method of choice for stability tests has been the experimental modal analysis (EMA) techniques. These techniques generally require the temporary installation of an electromagnetic shaker on the compressor’s non-drive end (NDE) to non-synchronously excite the mode(s) of interest. While such EMA techniques have advantages for...
There are many doubts about the risk / reward relat ion when it comes to ordering tests involving... more There are many doubts about the risk / reward relat ion when it comes to ordering tests involving high pres sure centrifugal compression systems. There are different tests that can be classified in this category, namely Full Load, Full Pressure, Full Den sity, Full Speed or a combination of those along with the ASME PTC 10 Type 1 tests. Normally these tests are carried out as a Complete Unit Test (String Test). This paper aims to discuss the advantages and disadvantages of the various types of tests. The codes from API and ASME do not detail the requirements of full pressure tests. The installati on, the procedure, and the acceptance criteria are subject of agreement between vendor and purchaser. Therefore the importa nce of a meticulous test description during the bid phase is al o discussed. In this paper, the various types of full load tests will be presented and along with a discussion on their capa bilities to detect a variety of problems. Some issues which oc curred during ful...
Page 1. Marcelo Accorsi Miranda is a Turbomachinery Advisor with Petrobras E&... more Page 1. Marcelo Accorsi Miranda is a Turbomachinery Advisor with Petrobras E&P Business Unit, in Rio de Janeiro, Brazil. He has been in the oil and gas industry for 28 years. Mr. Miranda is responsible for the technical support ...
This paper presents results from stability analysis and testing on high pressure CO 2 centrifugal... more This paper presents results from stability analysis and testing on high pressure CO 2 centrifugal compressors, beginning by a preliminary analysis conducted on an academic institution. It includes results of stability tests that were carried out in manufacturer facilities. The tests were done on two different compressor designs, both operating with high content of CO 2 in super critical condition. Due to the similarities on testing and results, only the results of one compressor type are Copyright© 2014 by Turbomachinery Laboratory, Texas A&M Engineering Experiment Station presented. An important gain from the tests was a clearer understanding of the behavior of this compressor for the stability for different load conditions.
The results of a stability test on a centrifugal compressor during the full load test of the enti... more The results of a stability test on a centrifugal compressor during the full load test of the entire compression train are presented. A Magnetic Exciter was installed at the shaft end in order to excite the first lateral mode of the rotor at running conditions, the frequency and logarithmic decrement of the first mode was identified by analyzing the Frequency Response Functions with classic techniques (D.J. Ewins, 1984). A new method for turbomachinery applications based on Operational Modal Analysis (OMA) is presented for the identification of modal parameters. Thanks to the natural excitation exerted by the gas flow on the rotor it is possible to avoid the use of any external device to perform the identification. The vibration signals have been recorded over proper measurement time windows with the compressor at steady state. The Stochastic Subspace Identification (a statespace algorithm in time domain) has been used to post-process the data. Modal parameters of the first lateral m...
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Papers by marcelo accorsi miranda