Locomotive 45-185 compressor: faster charging, lower current

BDZh EAD, Sofia — Locomotive Management Division, Plovdiv · commission appointed by BDZh Central Administration order No. 031 · chairman: Eng. Plamen Yordanov, chief repair specialist

Plovdiv, Bulgaria · report dated 01.11.2003 · repeat measurements after 20 800 km of locomotive service

PRODUCTXADO revitalizanttreatment of locomotive air compressors during lifting overhaul

TEST OBJECTAir compressor,
locomotive 45-185operating parameters recorded on compressor No. 2

DOCUMENT TYPECommission report,
BDZh EAD, Sofia

Key results

↓33%

time to charge the air system from 7 to 8 atm, 37 → 25 s

↓6.1-12.7%

compressor motor current, 80-118 → 74-103 A

EQUIPMENT AND UNIT	MILEAGE AFTER TREATMENT	WHAT WAS MEASURED
Locomotive 45-185, air compressor No. 2	20 800 km	Time to charge the air system from 7 to 8 atm; motor current at start-up, after 5 s of running and before shutdown

Air compressor No. 2 — before treatment and after 20 800 km of service

PARAMETER	BEFORE TREATMENT	AFTER SERVICE	CHANGE
Time to charge the air system from 7 to 8 atm	37 s	25 s	−12 s · 33 %
Motor start-up current	118 A	103 A	−15 A · 12.7 %
Current after 5 s of running	80 A	74 A	−6 A · 7.5 %
Current before shutdown	98 A	92 A	−6 A · 6.1 %

All measurements were taken by the commission of the enterprise on compressor No. 2 of locomotive 45-185, in one and the same operating mode before the treatment and after the service run.

Commission conclusion

The commission of the Locomotive Management Division of BDZh EAD recorded: «Based on the measurements it was established that the current dropped by 9 A on average, and the air system charging time was reduced by 12 s (or by 33 %)». The repeat measurements were taken on the same compressor and in the same operating mode, but already after 20 800 km of locomotive service — the effect holds under line duty, not merely right after the treatment. The shorter charging time means restored compressor output: the cylinder-piston group holds air again, and the same work is done in two-thirds of the former time. The current fell at all three points of the cycle — at start-up, under load and before shutdown — that is, the motor overcomes less friction resistance in the unit. Both quantities by which a depot judges the condition of a compressor have returned to working values.

The results refer to the air compressor of locomotive 45-185 of BDZh EAD and to its operating conditions; on other equipment and in other modes the figures may differ. The original report dated 01.11.2003, with signatures and seal, is published in full and available for download.

Current equivalent

Revitalizant gel for compressors and bearings →

Piston, screw and centrifugal compressors; rolling and sliding bearings running in an oil bath; machine-tool spindle units and slideways.

How such units are treated: Compressor

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