SU1418183A1 - Intake device for cargo pump of tanker ship - Google Patents

Abstract

The invention relates to shipbuilding, in particular to cargo systems of tankers, and reduces the downtime of tankers under unloading by increasing the performance of the cargo pump. For this, the inlet 2 is made with an annular opening 3 located in its upper base between the suction pipe 1 and the tapered surface of the receiving inlet 2 on the side of its upper base. When the level of oil in the tanker decreases, the annular opening 3 of the upper base of the suction inlet is blocked by a floating valve 5 mounted on the suction pipe 1 with the possibility of movement between the stops 6 and 7. 1 3.p. f-ly, 1 ill. about (b / c 4 00 00 with manxtpa

Description

one

The invention relates to shipbuilding; in particular to the cargo systems of tankers.

The goal of the invention is to reduce tanker downtime during unloading by increasing the performance of the cargo pump.

The drawing shows schematically the receiving device of the tank pump servo pump.

The receiving device of the cargo tanker pump contains a suction pipe 1 rigidly connected to the receiving pipe 2 from the side of its upper base, which has an annular opening 3, and the bottom base f of the pipe 2 is located above the bottom of the tanker. A floating valve 5 is mounted on the suction pipe 1, having the ability to move between the upper stop 6 and the lower stop 7. On the receiving pipe 2, an elastic shield 8 is fixed at one end, the other end of which is fixed on the right side 9, located on the bottom base side.

Constructive execution of a floating valve may be different, for example, ensuring the overlapping of the upper base of the nozzle from above on a flat plane and sealing on the outer surface of the valve or blocking on the inner surface of the nozzle - inflatable rubber

and t, n o

The receiving device operates as follows.

With a high level of oil 1 of the product in the tank, the floating valve 5 is located at the stop 6 above the upper base of the receiving pipe 2,

The unloading of the main part of the oil product is performed through the upper base of the nozzle 2. The petroleum product flows freely to the suction pipe 1, excluding the pressure loss on the inlet hydraulic resistance, thereby ensuring the sta- tion. work of the cargo pump.

With a further decrease in the level of petroleum product, the annular opening 3 of the upper base of the nozzle 2 is closed by a floating valve 5 (pos. 10), and a small part of the cargo is unloaded through the lower base of 4 nozzle 2. The presence of an elastic screen 8 with the float 9 prevents air from entering the receiving device, the most providing more

18183-2

full unloading of oil products due to the uniform supply of the cargo pump, excluding the disruption of its work.

The limiting dimensions of the bases 5 of the conical nozzle were chosen experimentally in order to ensure the necessary flow of oil leaking to the suction pipe and prevent air leaks, and

10 are determined by the fluidity (viscosity) of the oil product.

Thus, the lower limit of the upper base (Dg axis 1 5 dgc, where d pc is the diameter of the suction pipe) and 5 is such an area that provides the necessary leakage of oil products to the suction pipe having a low viscosity (light oil products - diesel fuels, kerosene, etc.). With Dj axis 4.5 dgc, the flow of fluid (by gravity) becomes less optimal and the pump performance decreases, since its power is spent on the formation of fluid flow to the place of its extraction (suction).

The upper base limit (D g. 3 dgj) is selected on the basis of discharge.

0 dark oil products with high viscosity (fuel oil of all brands, motor fuel, etc.). A further increase in the upper base does not significantly affect the performance of the cargo pump, and from the point of view of structural filling it becomes impractical.

The diameter of the lower base D. is limited by limits (1.0-1.6) d pc 0 at the rate of ensuring optimal operation with a low level of oil product, while the lower limit is recommended when working with light oil products and its decrease is lower than the regulated one causes an increase hydraulic resistance in the receiving device, which leads to increased energy consumption. The upper limit is recommended when working with dark petroleum products0

mi, and its increase over the regulated leads to air entrapment and the pump operation.

The size of the float is also determined experimentally, with a value of 0, 2.5 dgc air leakage is observed, and with Dpon 3.5 d, the efficiency during pump operation does not increase.

and its design execution is complicated.

Claims (2)

1. The receiving device of the cargo pump of the tanker, containing the suction pipe, as well as the inlet pipe coaxially with it and the float, characterized in that, in order to reduce the unloaded tankers under unloading by increasing the performance of the cargo pump, the inlet pipe is with an annular opening located in its upper base, and the suction pipe is provided with an annular floating valve installed on its outer surface with the possibility of axial movement along this pipe water between the stops made on it and the overlap of the annular opening of the suction inlet, one of the stops being located at the level of the upper the base of the nozzle, made in the form of a truncated cone, in which the diameters of the upper and lower bases are selected in the ranges five 0 D at. OSM DH. OSI where d c. OS (1.5 ... 3.0) d (1.0 ... 1.6) d Be BC H. OCH BC five diameter of the upper base of the suction inlet DU lgi - diameter of the lower base of the suction inlet; diameter of the suction pipe cross section. 2. The device according to claim 1, about tl, which means that it is provided with an elastic screen fixed at one end on the receiving branch pipe, and the other on the float, which is made toroidal, mounted coaxially with the receiving branch pipe and has a diameter of 2 , 5 ... 3 times overstepping by the size of the cross-sectional diameter of the suction pipe.