VP 205 40/3 compressor: less power, higher output, lower vibration and noise

SKLO LLC · report approved by the technical director; measurements signed by the chief mechanic and the senior foreman of the compressor section, with an engineer of XADO LLC in attendance

Merefa, Kharkiv region, Ukraine · treatment 13.08.2001 · report 28.08.2001

TECHNOLOGYTreatment by XADO technologyMetal-ceramic coating on friction surfaces, without disassembling the unit

TREATED UNITVP 205 40/3 piston compressorSerial No. 50120 · cylinder-piston group, stages I and II

DOCUMENT TYPECompany report
with signatures and seal

Key results

↓28.6%

no-load current draw, 210 → 150 A

↑5.6%

compressor output, pump-up time 280 → 265 s

↓47-67%

vibration velocity, stages I and II, 1.5-2.4 → 0.8 mm/s

↓30%

oil consumption through the lubricator, 0.5 → 0.35 l/h

UNIT	CONDITION AT START OF TESTING	WHAT WAS MEASURED
VP 205 40/3 piston compressor, serial No. 50120	In service; water from the cooling system was entering the working chamber of the stage II cylinder through a micro-crack in the liner	Current draw, pump-up time, vibration by stage, noise, operating temperatures, oil consumption and oil pressure

Power consumption and output

PARAMETER	BEFORE	AFTER	CHANGE
Current draw, no load, A	210	150	−28.6 %
Pump-up time, s	280	265	−15 s

Current was measured at no load; pump-up time — while raising pressure from 1.5 to 3.5 atm. It is this figure that yields the 5.6 % gain in output.

Vibration, noise and thermal behaviour

PARAMETER	BEFORE	AFTER	CHANGE
Vibration velocity, stage I, mm/s	2.4	0.8	−67 %
Vibration velocity, stage II, mm/s	1.5	0.8	−47 %
Noise level, dB	93.5	89.5	−4 dB
Oil temperature, °C	76	73	−3 °C
Discharge air temperature, °C	129	124	−5 °C
Coolant temperature, °C	32	32	no change

Coolant temperature was identical in both measurements: the cooling regime was comparable, so it does not account for the drop in oil and air temperatures.

Lubrication system

PARAMETER	BEFORE	AFTER	CHANGE
Oil consumption through the lubricator, l/h	0.5	0.35	−30 %
Oil pressure, kgf/cm²	1.1	1.15	+0.05 kgf/cm²

The report attributes the lower consumption to the cylinder-piston group: "oil carry-over through the cylinder-piston group decreased".

Conclusion of the company commission

The commission of SKLO LLC — the technical director, the chief mechanic and the senior foreman of the compressor section — recorded in the report: "After the treatment, oil carry-over through the cylinder-piston group decreased, electricity consumption fell by 28.5 %, and noise and vibration levels went down. Compressor output increased by 5.6 %. The ingress of water from the cooling system into the working chamber of the stage II cylinder ceased, because the existing micro-crack in the cylinder liner was sealed over by a layer of metal-ceramics". Before the treatment the compressor was running with a defect in the stage II liner, through which coolant water entered the working chamber. The unit was returned to working condition without disassembly and without replacing the liner.

The results relate to the VP 205 40/3 piston compressor (serial No. 50120) of SKLO LLC and to its operating conditions; on other units and duty cycles the figures may differ. The original report is published in full and available for download.

Current equivalent

Revitalizant gel for compressors and bearingsCompressors · bearings · spindles
Revitalizant gel for cylinder restorationEngine cylinders, deep wear

How such units are treated: Compressor Cylinder-piston group

← Full catalogue