Reciprocating refrigeration compressor foundation design, anchor bolt inspection and anti-vibration pad replacement specification

Reciprocating refrigeration compressor foundation design, anchor bolt inspection and anti-vibration pad replacement specification

Compressor foundation transfers dynamic load to ground and isolates vibration; insufficient foundation rigidity or damaged anti-vibration pads will amplify vibration and loosen anchor bolts. The foundation natural frequency shall be at least 1.4 times away from compressor operating frequency; this avoids resonance between unit and concrete base. Xiteliduo reciprocating compressor adopts composite rubber anti-vibration pads; pad thickness loss exceeding 20% or surface crack depth over 3 mm requires immediate replacement. Small 4-cyl reciprocating refrigeration compressor foundation is usually compact concrete block; anchor bolt loosening often originates from insufficient grouting during installation. Medium 4-cyl reciprocating refrigeration compressor anti-vibration pad aging shows uneven compression; one-side pad collapse causes unit tilt and misalignment of coupling. Large 4-cyl reciprocating refrigeration compressor heavy base needs annual anchor bolt torque check; torque drop over 15% from original value indicates bolt relaxation. Large 6-cyl reciprocating refrigeration compressor multi-cylinder alternating excitation generates complex dynamic force; foundation crack inspection must cover all base edges and corners. Many maintenance teams only retighten loose anchor bolts without checking pad condition. This practice leads to repeated bolt loosening probability rising by 46%. Single-unit two-stage refrigeration compressor low-stage and high-stage share one foundation; vibration coupling between two compressors may create new resonance peaks. Cascade unit high-stage reciprocating refrigeration compressor foundation bears higher dynamic load; anti-vibration pad material must resist high ambient temperature around discharge piping.

FAQ

Q1: What frequency separation requirement is needed for compressor foundation to prevent resonance? A1: Foundation natural frequency shall be at least 1.4 times away from compressor operating frequency. Q2: What defect threshold requires replacement of Xiteliduo composite rubber anti-vibration pads? A2: Thickness loss over 20% or surface crack depth deeper than 3 mm. Q3: What is the common root cause of small 4-cyl compressor anchor bolt loosening? A3: Inadequate grouting during initial installation. Q4: What symptom indicates aging of medium 4-cyl compressor anti-vibration pads? A4: Uneven compression and one-side pad collapse leading to unit tilt. Q5: What torque deviation triggers anchor bolt re-tightening for large 4-cyl compressor? A5: Torque drops more than 15% compared with original installation torque. Q6: What risk will appear if only retightening anchor bolts and ignoring anti-vibration pads? A6: The probability of repeated bolt loosening increases by 46%. Q7: What vibration phenomenon exists on shared foundation of single-unit two-stage compressor? A7: Vibration coupling between low-stage and high-stage may generate new resonance peaks.