IE A076COMMISSION REPORT · TREATMENT WITHOUT DISASSEMBLING THE UNIT
VPZ 20/9 UKhLCh compressor: output up, while friction, heat and noise went down
Friction in the units decreased, the compressor became cooler and quieter, oil consumption dropped. 20 % — K-19 oil consumption per shift, 250 → 200 g; 28.6 % — motor rotor coast-down, 3.5 → 4.5 s; 5–7 °C — stage and crankcase temperature, 45–85 → 40–78 °C; 10 dB — ultrasonic noise at the crankcase, 20 → 10 dB (2002).
with signatures and stamp
Key results
| EQUIPMENT | CONDITION AT THE START OF TESTING | WHAT WAS MEASURED |
|---|---|---|
| VPZ 20/9 UKhLCh compressor | In service since 1986 — 16 years of operation; knocking of the connecting rod bearing shell was audible | Time to reach working pressure, power consumption, oil pressure, rotor coast-down, oil consumption, temperature, noise, vibration |
Compressor operating parameters
| PARAMETER | BEFORE TREATMENT | AFTER TREATMENT | CHANGE |
|---|---|---|---|
| Time to reach working pressure 6 kgf/cm² | 6 min 45 s | 5 min 50 s | ↓ 55 s |
| Power consumption, no load (A × V) | 120 × 400 | 118 × 395 | 97.1 % of the initial value |
| Oil pressure, kgf/cm² | 2.4–2.5 | 2.5–2.55 | ↑ increase |
| Motor rotor coast-down, s | 3.5 | 4.5 | ↑ 1.0 s |
| K-19 oil consumption per shift, g | 250 | 200 | ↓ 50 g |
According to the commission's findings, the shorter time to reach working pressure corresponds to a 13.6 % increase in compressor output, while the reduction of friction forces was estimated at 23 %.
Temperature behaviour and noise
| MEASUREMENT POINT | BEFORE TREATMENT | AFTER TREATMENT | CHANGE |
|---|---|---|---|
| Temperature, stage II | 45 °C | 40 °C | ↓ 5 °C |
| Temperature, stage I | 85 °C | 78 °C | ↓ 7 °C |
| Temperature, crankcase | 48 °C | 42 °C | ↓ 6 °C |
| Ultrasonic noise, crankcase | 20 dB | 10 dB | ↓ 10 dB |
As estimated by the commission, compressor vibration decreased by 22 %, and ultrasonic noise was halved.
Commission's conclusion
Current equivalent
- Revitalizant gel for compressors and bearingsCompressors · bearings · spindles
- XADO “Restorative” greaseFriction pairs · joints
How such units are treated:
About this result:
Limits of this report: The results refer to the VPZ 20/9 UKhLCh reciprocating compressor under the operating conditions of Isker JSC; on other equipment and in other duty cycles the figures may differ.