Analysis and on-stream countermeasures of sub-synchronous vibration of a centrifugal compressor

Case StudyThe sub-synchronous vibration could be attributed to many causes such as gas-whirl, oil whirl, looseness and so on. To prevent sub-synchronous vibration, manufacturer analyzes stability during design stage. But field condition can be changed because of process issues. Based on actual experience of sub-synchronous vibration in recycle gas compressor of MDU(Middle Distillation Unit) plant, this case study will show how to analyze and reduce vibration without compressor shut down by applying on-stream countermeasure

Reliability Improvement for Booster Reciprocating Compressor In CCR Reformer

Case Stud

Analysis and Countermeasures for Sideband of Gear Mesh Frequency(GMF) Induced by Shaft Fretting Corrosion in a Gearbox

Case StudyCS deals with trouble shooting and solving a chronic fretting corrosion damage b/w a gear and shaft (shrink fit). The damage on the geared shaft always accompanied by an increase in the amplitude and frequency side bands at the gear mesh frequency (GMF). The troubleshooting process and analysis revealed that the distance between the two gears is a critical design parameter for preventing fretting corrosion

Analysis and on-stream countermeasures of High Thrust Bearing Temperature of A Centrifugal Compressor

Case StudyThe problem of high bearing temperature is a frequent concern for most rotating machinery. In case of critical equipment such as critical compressors or turbines, its consequences could lead to total plant shut down and huge losses. Furthermore it is very hard to find its cause, and solutions. On-stream remedies are very limited because the machines aren’t stopped. For the investigation and analysis of high thrust bearing problem of centrifugal compressor, it is required to understand the mechanism of bearing temperature increase as well as thrust load balance. In addition, it is also needed to review the quality and quantity of lube oil supply, and maintenance and operation history in various aspects. Based on actual experience of high thrust bearing temperature rise in recycle gas compressor of Residue Hydrogen Desulfied (RHDS) plant, this case study will show how to analyze it and take on-stream countermeasures, as well as lessons-learned for maintenance and design

Reliability Improvement for Booster Reciprocating Compressor In CCR Reformer

Case Stud

Analysis and Countermeasures for Sideband of Gear Mesh Frequency(GMF) Induced by Shaft Fretting Corrosion in a Gearbox

Case StudyCS deals with trouble shooting and solving a chronic fretting corrosion damage b/w a gear and shaft (shrink fit). The damage on the geared shaft always accompanied by an increase in the amplitude and frequency side bands at the gear mesh frequency (GMF). The troubleshooting process and analysis revealed that the distance between the two gears is a critical design parameter for preventing fretting corrosion

CST09 - Analysis and countermeasure for Sulfide Stress Cracking of Centrifugal compressor

Case StudyIn case of copressors operated in evironment of wet hydrogen sulide, Sulfide Stress Craking could act critical mechanism of impeller failure. This case study deal with what make sulfide stress cracking and how to take a countermeasure to prevent recurrence of sulfide stress craking, based on 2 cases of impeller failure from petroleum process