| Autor: |
Jędral, Waldemar, Karaśkiewicz, Krzysztof, Szymczyk, Jacek |
| Předmět: |
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| Zdroj: |
Journal of Power Technologies; 2014, Vol. 94 Issue 3, p196-201, 6p |
| Abstrakt: |
Pump characteristics H(Q), P(Q) and η(Q) provided by pump manufacturers in the form of test results or in situ examination results carried out by measurement companies describe pumps functioning in the "first quarter", i.e., in the pump functioning zone. They enable pump parameters to be calculated in other points of the zone for a rotational speed different than the nominal one. However, pumps sometimes function in untypical zones. This is due to failures resulting from startup with high pressure on the pump discharge flange or an existing non-zero flow (during parallel operation or with positive geometric head), when using pumps to dissipate energy (during periodical work in a serial system) or to recover energy in turbine mode. Quantitative and qualitative descriptions of those parameters for all possible functioning states are included in the universal pump characteristics. These characteristics, described in the literature, concern pumps with just a few specific speeds. This article presents characteristics of pumps with as yet unpublished specific speeds. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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