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Study of the stability of methane hydrates in normal conditions

Pavlenko A., Koshlak V., Vytyaz O.

AGH Drilling, Oil, Gas

2014

Vol. 31, no. 4

495--505

The problems of accumulation, transport and storage of gases and gas mixtures exist in many cases. Often the existent technologies appear ineffective for transporting his with pipelines, as condensate or compressed gas. Therefore, the transportation and storage of gas in hydrate form can be an alternative to traditional technologies. Preservation of gas hydrate blocks can store them for some time at the no equilibrium conditions. The thermodynamic parameters of forcibly conservation of gas hydrate blocks theoretically are determined and experimentally verified.

Warunki równowagi czopa w poprzecznym łożysku hydrostatycznym.

Przybył R.

Zagadnienia Eksploatacji Maszyn

1999

Vol. 34, nr 1

103-109

W artykule przedstawiono równania równowagi czopa w poprzecznym łożysku hydrostatycznym o dowolnej liczbie komór. Założono, że przepływ oleju przez dławiki może być dowolny: uwarstwiony, burzliwy lub pośredni, np. uwzględniający różne połączenia dławików. Przedstawiono wyniki badań doświadczalnych dla obciążenia statycznego.

Conditions of shaft equilibrium in a hydrostatic journal bearing are usually formulated for two types of restrictor flow: laminar and turbulent. In practice, limiting oneself to only these two cases frequently turns out to be insufficient. One may come across restrictor constructions consisting of elements connected in series, in which the character of flow is different [L. 5]. Sometimes, oil is channelled to the bearing recesses through capillary and orifice restrictors connected in parallel. Formula allows one to calculate the rate of oil flow through the restrictor for any character of flow: laminar, turbulent, and also for intermediate cases i.e. for different restrictor connections. Equations of shaft equilibrium in a hydrostatic joural bearing hold good for all kinds of loads - constant or variable, any number of recesses k > or = 3, and also for all locations of loads with respect to recesses. In the event of static load, the solutions for the abovementioned equations are given dependencies. Figure shows the results of measurements of displacements y and z in a force-function Wy (at Wz=0) for two bearings, the relevant data regarding which have been presented in a table. The results of theoretical analysis and experimental research show that equations in which dependence has been taken into consideration, may be useful in the process of designing and researching of hydrostatic journal bearings.