FIELD: oil and gas industry.
SUBSTANCE: invention is mostly related to the oil industry. The oil refinery includes the following parts constituting its hydraulic system: a crude oil receiving and storage tank battery connected to the refinery through a system of process pipelines equipped with shutoff and/or shutoff and control valves with a locking mechanism and with pumping equipment mostly composed of electric pumps; an integrated process system of oil refining and fractionation plants to produce commercial oil products with their possible, at least partial compounding; a boiler house and/or thermal or electric and thermal power generating units and plants connected through a piping network or networks as appropriate with a cold and/or hot water supply source and with internal and/or external thermal power consumers; at least one combustible waste recovery system; and a storage tank battery for fractions and commercial oil products fitted with a system of process pipelines and preferably connected with the above-mentioned main process plants thereby forming part of the main hydraulic system of the refinery. At least one process pipeline and/or hot and/or cold water supply pipeline designed as a pressure pipeline and fitted accordingly with at least one electric pressure pump is equipped with a hydromechanical device to provide gradual load of the hydraulic system. The hydromechanical device is connected to at least one pressure pipeline usually on the pressure side between a pump or pump group pressurising the pipeline and the nearest shutoff and/or shutoff and control valve, communicates with the pipeline through working medium, usually pumped liquid, and is mounted so that on and off operations of the shutoff and/or shutoff and control valves can be automatically prolonged. The hydromechanical device includes the following components that are connected in series with each other: an inlet nozzle; a governor to control the opening speed of the shutoff and/or shutoff and control valves and the load transfer to the hydraulic system; and hydromechanical drive. The latter includes a power chamber with a housing containing at least one variable displacement compartment for controlled liquid medium back filling in case of pipeline pressure increase; and a transfer mechanism. The hydromechanical device is double-connected to the pipeline: at the inlet - an inlet nozzle allows it to communicate with the pipeline through working medium; at the outlet - it is kynematically by the hydromechanical drive with the locking element of the above-mentioned valves. The movable transfer mechanism is connected to the power chamber through a "piston-rod" or "membrane-rod" connection type.
EFFECT: capability to start pumps and spin up to a speed close to the operating speed reached with closed valves, which reduces power consumption at pump motor start-up, as well as automatically achieved gradual opening of valves and soft start of hydraulic systems, quick pressure release, and system shutdown when motors are stopped.
20 cl, 11 dwg
