Press hydraulics: NAR 224/32 pumps back in service without replacement

MMK im. Ilyicha OJSC, press equipment shop · signed by: head of the press equipment shop V. A. Tkachev, shop mechanic V. A. Borodin, head of the planning bureau of the Chief Mechanic's Department B. F. Shuvalov

Mariupol, Ukraine · bench tests at the press equipment shop from 25.12.2000 · running tests on press DO-242 No. 2 on 10.01.2001

PRODUCTXADO RVSXADO repair-and-restoration compounds — generation zero of the technology

TREATED EQUIPMENTPress shop hydraulic equipmenthigh-pressure pumps NAR 224/32 · directional control valve 1VE10.574 AV110

DOCUMENT TYPEEconomic effect calculation
signed by officials of the press shop and the Chief Mechanic's Department

Key results

↓2.23×

cost of returning a NAR 224/32 pump to service, 6030 → 2700 UAH

↓280UAH

hydraulic booster 1VE10.574V110 was beyond repair — no purchase of a new unit was needed

EQUIPMENT	CONDITION AT THE START OF TESTS	WHAT WAS ASSESSED
High-pressure pump NAR 224/32 · 3 units	Residual working pressure 12 MPa (unstable) and 3 MPa	Working pressure on the test bench, fitness for further service
Directional control valve 1VE10.574 AV110 · 1 unit	Leaks past the piston: the pump does not reach rated pressure	Pressure developed by the pump, fitness for further service

Condition of the hydraulic equipment before and after treatment

UNIT	BEFORE TREATMENT	AFTER TREATMENT
Pumps NAR 224/32, 3 units	Residual working pressure 12 MPa (unstable) and 3 MPa	Rated parameters, fully fit for further service
Directional control valve 1VE10.574 AV110	Leaks past the piston — the pump did not reach rated pressure	Rated parameters, fully fit for further service

The post-treatment assessment is based on running tests of the restored equipment on press DO-242 No. 2, 10.01.2001.

Cost of restoration versus factory repair and replacement

UNIT	FACTORY REPAIR OR REPLACEMENT	RESTORATION WITH XADO RVS	SAVINGS
Pump NAR 224/32, 1 unit	6030 UAH — repair at the Kharkiv Hydraulic Drives Plant	2700 UAH	3330 UAH
Hydraulic booster 1VE10.574V110	280 UAH — the unit is beyond repair and must be replaced	restored together with the hydraulic equipment	280 UAH

Prices are given in hryvnia as of the date of the document, 2000–2001.

Conclusion of the plant commission

The commission of MMK im. Ilyicha OJSC recorded that as of 10.01.2001 the hydraulic equipment had been restored and had passed running tests on press DO-242 No. 2 — "the said equipment has rated parameters and is fully fit for further service". Three pumps were returned to service, on which wear had brought residual working pressure down to 3 MPa and 12 MPa, together with a hydraulic booster that by factory practice was beyond repair and had to be replaced. According to the commission's calculation, repair of one NAR 224/32 pump at the Kharkiv Hydraulic Drives Plant costs 6030 UAH, while restoration with XADO repair-and-restoration compounds costs 2700 UAH: savings of 3330 UAH per pump, meaning that factory repair is 2.23× more expensive. Savings on the hydraulic booster amount to 280 UAH.

The results relate to press shop hydraulic equipment — high-pressure pumps NAR 224/32 and directional control valve 1VE10.574 AV110 running on IGP-30 oil; on other units and under other operating conditions the figures may differ. Costs are given at 2000–2001 prices; the economic effect calculation was signed, among others, by a representative of the organisation that carried out the treatment. RVS is an obsolete XADO designation for generation zero compounds; the current generation of products are revitalizants. The original document is published in full and available for download.

Current equivalent

Revitalizant gel for hydraulic systems →

Hydraulic systems of industrial and special equipment, pumps, motors and valves; gearboxes with oil filtration.

How such units are treated: Pump Hydraulic system

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