Reciprocating refrigeration compressor overhaul scope, acceptance criteria and post-overhaul test items

Reciprocating refrigeration compressor overhaul scope, acceptance criteria and post-overhaul test items

Reciprocating refrigeration compressor overhaul shall be carried out when cumulative operating hours reach 24000 h or obvious permanent mechanical defects occur, whichever comes first. After complete overhaul, the volumetric efficiency of reciprocating refrigeration compressor shall recover to no less than 95% of factory rated value; vibration and noise shall meet original specification. Xiteliduo reciprocating compressor overhaul includes piston ring replacement, valve plate assembly renewal, crankshaft bearing inspection, gasket full replacement and oil system flushing. Small 4-cyl reciprocating refrigeration compressor overhaul mainly focuses on valve plates and piston rings; these two parts account for over 70% of wear-related performance degradation. Medium 4-cyl reciprocating refrigeration compressor overhaul requires crankshaft dimensional measurement; crankshaft surface wear exceeding 0.03 mm needs grinding and repairing. Large 4-cyl reciprocating refrigeration compressor overhaul must check crankshaft straightness; bending deflection greater than 0.02 mm per meter will induce continuous abnormal vibration. Large 6-cyl reciprocating refrigeration compressor overhaul needs to test unloading mechanism for all cylinders one by one; every unloading cylinder must switch smoothly without sticking. Many users only replace broken parts during partial repair instead of full overhaul. Partial repair shortens the next overhaul cycle by 42%. Single-unit two-stage refrigeration compressor overhaul must inspect low-stage and high-stage components separately; valve and bearing wear rate differs greatly between two stages. Cascade unit high-stage reciprocating refrigeration compressor overhaul acceptance shall include continuous load test for at least 4 hours under design working condition.

FAQ

Q1: What is the overhaul trigger standard for reciprocating refrigeration compressor? A1: Overhaul at 24000 cumulative running hours or when permanent mechanical defects appear. Q2: What volumetric efficiency standard shall be achieved after compressor overhaul? A2: Volumetric efficiency should restore to ≥95% of factory rated value. Q3: What core items are included in Xiteliduo reciprocating compressor full overhaul? A3: Replace piston rings and valve plates, inspect crankshaft bearing, renew all gaskets and flush oil circuit. Q4: Which components cause most performance degradation for small 4-cyl reciprocating compressor? A4: Valve plates and piston rings, responsible for over 70% of wear-related performance loss. Q5: What crankshaft wear threshold requires grinding repair for medium 4-cyl reciprocating compressor? A5: Crankshaft surface wear over 0.03 mm needs grinding. Q6: What penalty will partial repair bring compared with full overhaul? A6: Partial repair reduces the interval to next overhaul by 42%. Q7: How long is the continuous load test required after overhaul of cascade high-stage reciprocating compressor? A7: Minimum 4 hours continuous load test under design operating condition.