FIELD: oil and gas industry.
SUBSTANCE: invention is related to equipment intended for tank decoking and may be used for treatment of oil and oil products. The equipment intended for decoking by fluid jets comprises a mechanism for delivery of decoking fluid, a nozzle unit, a cover, at least one cutting nozzle, at least one drilling nozzle and at least one deflector plate for selective orientation of fluid to one of the drilling and cutting nozzles. The fluid delivery mechanism is configured for receipt of pressurized fluid for decoking from the source. There's at least one pipeline for decoking fluid in the cover. The cutting nozzle is made so that selective fluid communication with the pipeline may be created. At least one cutting nozzle is protruded in lateral direction beyond the external dimension set by the cover. Beyond at least one cutting nozzle the major part is not protruded in lateral direction beyond the external dimension set by the cover. The drilling nozzle is made so that selective fluid communication with the pipeline may be created. At least one of cutting nozzles and one of drilling nozzles comprise an inner channel formed between the input and output. The inner channel sets curved conical shape, which is converged along the axial length from input towards output. Upon passage through the fluid flow the flow pattern of decoking fluid at the output from the cutting nozzle and drilling nozzle will be mainly coherent. Radius of the channel cross-section at the input, radius of the channel cross-section at the output and axial length are selected in order to minimize radial velocity and inhomogeneous axial velocity through the minimized axial length.
EFFECT: improving manufacturability, simplifying drilling and improving working efficiency due to possibility of linear conversion in kinetic energy and pressure energy and to facilitation of exact prediction in scaled structures.
8 cl, 5 dwg, 1 tbl
