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Design flows for pressure sewers

Błażejewski R., Matz R.

Environment Protection Engineering

2012

Vol. 38, nr 2

157--170

Existing methods to estimate design flows of sewage in pressure mains have been compared. It was found that the number of simultaneously running identical cavity displacement (grinder) pumps (m out of n), connected to a pressure main is better described by the binomial (for n &le 30) and normal distributions (for n > 30) than by the Poisson probability distribution. A new probabilistic approach to estimate the design flow which takes into account distinguishable (not identical) sources of sewage, disposing to a pressure main, is presented. All possible states of pumps, equal to the number of variations with repetitions, are considered. The method is elaborated for small systems equipped with cavity displacement pumps which have relatively steep characteristic curves. A new formula for the peaking factor, combining averaging over time and over ensemble (number of dwellings) is also presented. The new formula can be applied for individual homes, dwellings in apartment blocks and villages, serving by cavity displacement and/or centrifugal pumps.

Influence of hydraulic oil viscosity on the volumetric losses in a variable capacity piston pump

Koralewski J.

Polish Maritime Research

2011

nr 3

55-65

The variable capacity piston pumps are elements of the great power and highest energy efficiency hydrostatic drives. They are used in the drive systems of ship equipment such as deck cranes, steering gears, main propulsion of smaller vessels. The laboratory and simulation investigations of the influence of liquid viscosity on the variable capacity displacement pump energy losses have not been so far performed. The paper presents results of the investigations of impact the hydraulic oil viscosity has on the volumetric losses in a piston pump operating in the full range of its capacity and oil pressure.

Wykrywanie zmian ciśnienia roboczego pompy wyporowej

Stojek J.

Hydraulika i Pneumatyka

2007

nr 5

13-16

Wskazano na możliwość wykorzystania parametrycznego modelu autoregresji z zewnętrznym wymuszeniem ARX opisującego właściwości dynamiczne układu elektrohydraulicznego w procesie wykrywania niesprawności jego działania. Pokazano zależność parametrów tego modelu od zmian ciśnień pracy układu, powstałego na skutek nieodpowiedniego ciśnienia wyjściowego pomp wyporowej.

The article present the possibility of use parametrical ARX model of electro-hydraulic system in his work fault detection. Model parameters dependence of system work pressure changes due to improper output pressure of positive-displacement pump was shown.