Cavitation tests with feed pump PN-1500-350
At the Ural Branch of the All-Union Thermotechnical Institute, the cavitation characteristics of the seven stage feed pump PN-1500-350 were obtained and analyzed. The pressure at the inlet was changed by a valve while the feed, the rotational frequency of the rotor, and the water temperature remained constant. In the tests of the pump, constant feed was ensured with the aid of a control valve, and water was not extracted from the first stage. By changing the pressure at the inlet with unchanged feed, determination was made of the permissible cavitation margin, marking the appearance of low-frequency vibrations of the rotor and a change of the amplitude of the pressure pulsations. The tests showed that when the cavitation margin is reduced to approximately 60m, the head of the first stage and the efficiency of the pump remained practically unchanged. The lowest possible pressure at the pump inlet was determined from the appearance of vibrations for axial shift. To this minimum pressure at the inlet correspond the cavitation margins of 67.6, 71.8, 72.3 and 73.3 m. The theoretical minimal permissible cavitation margin was determined by Rudnev's formula.
- OSTI ID:
- 6196122
- Journal Information:
- Chem. Pet. Eng. (Engl. Transl.); (United States), Vol. 19:9; Other Information: Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 9, pp. 17-18, September, 1983
- Country of Publication:
- United States
- Language:
- English
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