Suction Header Cracking

•   Power quality
•   Natural gas pumping station
•   Four reciprocating compressors
•   Cracking of pipe caused by structural resonance driven by pulsations
•   Pressure and vibration measurements
•   Finite element modelling confirmed natural resonance and pipe stress concentration
•   Fatigue life assessment
•   Recommended solution included operating and structural modifications

Mid-Stage Scrubber Cracking

•   Natural gas reciprocating compressor
•   Extensive cracking caused by unbalance couple and structural resonance
•   Fastening issues identified by vibration measurements
•   Finite element modelling used to confirmed base strength and structural modifications
•   Recommended solution included operating and structural modifications

Gas Compressors

•   Excessive vibration in suction piping
•   Four vibration units investigated
•   On-site measurements of pressure and vibration, assessment to API guidelines
•   Finite modelling confirmed resonance and unbalance force contributions
•   Stress analysis used to confirm API guidelines
•   Structural modifications applied to reduce vibrations and dynamic stresses