API 619 (5th Edition, 2010)

Rotary-type Positive Displacement Compressors for Petroleum, Petrochemical and Natural Gas Industies

 

 

본 규격은 Rotor Type Positive Displacement Compressor에 적용하며, Shop Test시 사용하는 Vibration Limit에 대해 Dry, Oil-Flooded Screw Compressor에 따라 아래와 같이 각각 명기하고 있다.

 

 

1. 진동 기준치, Dry Screw Compressor

	Hydrodynamic bearings	Rolling element bearing
Measurement on bearing housing
Vibration at any speed within operating range -Overall -Increase in allowable vibrations at speeds beyond operating speed but less than trip speed	Vu<5.0mm/s RMS (0.2 in/s RMS) 50%	Vu<8.0mm/s RMS (0.3 in/s RMS) 50%
Measurement on shaft adjacent to bearing
Overall vibration at any speed within the operating speed range Increase in allowable vibrations at speeds beyond operating speed but less than trip speed	"A" shall be the lesser value of or 50% bearing clearance 50%
Vu is the unfiltered velocity. RMS is the root mean square. A is the unfiltered peak-to-peak amplitude of vibration. n is the max continuous speed in revolutions per minute(r/min).

 

 

2. 진동 기준치, Oil-Flooded Screw Compressor

Measurement on bearing housing	Hydrodynamic bearings	Rolling element bearing
Vibration at any speed within operating range -Overall -Increase in allowable vibrations at speeds beyond operating speed but less than trip speed	Vu<8.0mm/s RMS (0.3in/s RMS) 50%	Vu<8.0mm/s RMS (0.3in/s RMS) 50%
NOTE  The pulsating oil flow through the oil-flooded screw compressor causes increased vibration. Oil-flooded screw compressors with hydrodynamic bearing typically operate with higher compression ratios and/or higher discharge pressures than machines with rolling element bearings.
Vu is the unfiltered velocity. RMS is the root mean square.

 

 

 

 

진동측정, 진동 분석, 진동 해결, 설계 검토 - (주)이너턴스

 

 

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