Industrial compressor: bore wear offset, no overhaul needed

Prywatna Huta «ALMET», Częstochowa · signed by: plant director mgr inż. Lech Pustuł, independent expert dr inż. Janusz Kuliś, XADO representative Yuriy Bosiy

Częstochowa, Poland · report dated 04.11.2000 · test on in-service equipment, 121 h of operation

PRODUCTXADO revitalizantformulation for petrol engines · 3 tubes, three additions into the oil system

TEST OBJECTThree-cylinder compressorworking pressure up to 7 atm · cylinder bores, piston group

DOCUMENT TYPETest report
with signatures and sealmeasurements outsourced to an external workshop, an independent expert engaged for assessment

Key result

↓2.5×

score depth on the cylinder No. 2 bore, 0.05 → 0.02 mm

MACHINERY AND COMPONENTS	CONDITION AT START OF TESTING	WHAT WAS MEASURED
Three-cylinder compressor, working pressure up to 7 atm	Unfit for service: heavy oil consumption, low compression	Oil consumption, receiver filling time
Cylinder No. 2 bore	Destroyed over a significant area of the upper section, score depth about 0.05 mm	Score depth
Cylinder No. 1 bore	Three scores, perceptible to the finger	Surface condition
Shop pneumatic hammers	Frequent seizures, erratic operation in a dusty and aggressive environment	Tool operation, assessment

Cylinder bores — condition before and after the test

COMPONENT	BEFORE TREATMENT	AFTER 121 H OF OPERATION
Cylinder No. 2, upper section of the bore	Bore destroyed over a significant area, score depth about 0.05 mm	Greatest score depth 0.02 mm, bore largely restored
Cylinder No. 1, bore	Three scores, perceptible to the finger	The former scores can no longer be felt

Score depth measurements were carried out by an external organisation — Zakład Mechaniki Pojazdowej «AUTO-SZLIF-SPRAWKA», Częstochowa.

Compressor operating parameters

PARAMETER	BEFORE TREATMENT	AFTER TREATMENT
Engine oil consumption	100 cm³ per 8 h of operation	100 cm³ per 24 h of operation
Receiver filling time to 4.5 atm	3 min	1 min 30 s

Before the test the piston rings of all pistons were replaced; ring replacement has no effect on the geometry of the cylinder bores.

Conclusion of the report

The report of Prywatna Huta «ALMET» states: «After this test, repair of the compressor proved unnecessary owing to the significant improvement in operating parameters». Before treatment the unit was unfit for service: the bore of the first cylinder had three scores perceptible to the finger, the bore of the second was destroyed over a significant area of its upper section, with a score depth of about 0.05 mm. After 121 h of operation the greatest score depth in the second cylinder was 0.02 mm, the bore was largely restored, and the former scores in the first cylinder could no longer be felt — the coating had built up where the wear had been. Separately, the XADO repair kit for metal surfaces was applied to the shop pneumatic hammers: the seizures stopped and the tools ran smoothly. The authenticity of the facts described is certified by the plant director, the independent expert and the XADO representative.

The results relate to a three-cylinder industrial compressor with a working pressure of up to 7 atm at the Prywatna Huta «ALMET» plant (Częstochowa, Poland); on other units and duty cycles the figures may differ. The report was signed, among others, by a XADO representative; the score depth measurements were performed by an external workshop, and an independent expert was engaged for the assessment. The original report with signatures and seal 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

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