Reciprocating refrigeration compressor vibration amplitude threshold and on-site monitoring specification

Reciprocating refrigeration compressor vibration amplitude threshold and on-site monitoring specification

Vibration amplitude is the core monitoring index for reciprocating refrigeration compressor, reflecting the alignment state, bearing wear and foundation stability of the whole unit. For reciprocating refrigeration compressor bearing housing, the acceptable full-load vibration amplitude is below 0.06 mm; vibration above 0.08 mm will accelerate bearing wear by 3 times. Xiteliduo reciprocating compressor equips vibration monitoring interface; the alarm threshold is set at 0.07 mm peak-to-peak value, and shutdown protection triggers at 0.10 mm peak-to-peak. Small 4-cyl reciprocating refrigeration compressor vibration mainly comes from crankshaft rotation and gas pulsation; proper spring isolator can reduce foundation transmitted vibration by 86%. Medium 4-cyl reciprocating refrigeration compressor needs vibration inspection every 1000 running hours; vibration rising by more than 0.02 mm within one inspection cycle indicates component wear. Large 4-cyl reciprocating refrigeration compressor has heavier moving mass, so misalignment of coupling will increase vibration amplitude by 0.05 mm within 500 running hours. Large 6-cyl reciprocating refrigeration compressor has more cylinders working alternately, so its gas pulsation induced vibration is about 32% lower than large 4-cyl reciprocating refrigeration compressor. Many site operators only monitor vibration after unit startup. The vibration value rising by more than 0.03 mm after reaching thermal balance is a warning sign of bearing clearance expansion. Single-unit two-stage refrigeration compressor has two sets of compression cylinders, so vibration measurement points shall cover both high-pressure and low-pressure stage bearing housings. Screw refrigeration compressor has rotating rotor without reciprocating motion, so its normal vibration amplitude is only 25~35% of the vibration level of large reciprocating refrigeration compressor.

FAQ

Q1: What is the acceptable full-load vibration amplitude limit of reciprocating compressor bearing housing? A1: The acceptable vibration amplitude should stay below 0.06 mm under continuous full load. Q2: What are the vibration alarm and shutdown threshold for xiteliduo reciprocating compressor? A2: Alarm at 0.07 mm peak-to-peak, automatic shutdown protection triggers at 0.10 mm peak-to-peak. Q3: How much can spring isolator reduce foundation transmitted vibration for small 4-cyl compressor? A3: Proper spring vibration isolator can reduce vibration transferred to foundation by up to 86%. Q4: What vibration increment within one inspection cycle indicates component wear? A4: A vibration rise over 0.02 mm between inspections is a sign of internal component wear. Q5: How much lower gas pulsation vibration does large 6-cyl compressor have versus large 4-cyl model? A5: Its gas pulsation vibration is about 32% lower than large 4-cyl reciprocating refrigeration compressor. Q6: Where are vibration measurement points for single-unit two-stage refrigeration compressor? A6: Measurement points must cover bearing housings of both high-pressure and low-pressure stages. Q7: How does normal vibration level of screw refrigeration compressor compare with large reciprocating compressor? A7: Screw compressor vibration is only 25~35% of large reciprocating refrigeration compressor vibration level.