To study the effect of pressure pulsation and shake forces in suction line with different operational cases.
The suction pipe for pulsation analysis starts from inlet guide filter and connects to suction end of reciprocating compressor cylinder A1 and A2 via Low pressure cooler, Low pressure accumulator and first stage suction dampener.
Following assumptions and considerations have been taken for the analysis flow induced turbulence
1. Pipe connected to storage tanks or header is considered as open end which specifies pressure waves will not reflect back in piping system.
2. Maximum allowable pressure drop shall not exceed 0.25% of average absolute line pressure at the device.
3. Amplitude due to pipe vibrations based on the maximum calculated acoustic shaking forces shall be limited to maximum allowable vibration amplitude of 0.5 mm peak-to-peak for frequencies below 10 Hz.
4. Dynamic stresses in the piping system due to shaking forces shall be limited to maximum allowable stress as per applicable standard.
Results obtained from pulsation analysis show pulsation peaks which are lower than the allowable values as per API 618 5th edition as pulsation waves generated by the reciprocating compressors are absorbed in pulsation dampeners and orifice plates at flow induced vibrations upstream and downstream of pulsation dampeners.
The pipe stresses obtained from dynamic stress analysis for shake forces at different harmonics are under allowable limits
No modification is required in suction piping system.