The present invention relates to an apparatus for detecting a differential pressure in order to detect a flow rate in a blast furnace gas, a coke oven gas, a ladle gas, and a blower air process piping. The pressure guiding pipe connected to the gas pipe is arranged in the circumferential direction to detect the pressure from the gas pipe in the radial direction, thereby preventing the closing of the detection port due to impurities, enabling accurate pressure detection, and the flow measurement due to the differential pressure detection. The present invention relates to a differential pressure detecting device for a gas pipe, which can greatly improve deviation and process control accuracy.;According to the present invention, high and low pressure guide tubes are drawn from both sides of an orifice mounted inside the gas pipe, and each of the pressure guide tubes is connected to a differential pressure transmitter, and the differential pressure transmitter is electrically connected to a control panel. An apparatus for detecting a pressure difference in a gas pipe used to calculate a gas flow rate, the pressure pipe comprising: a plurality of straight pipes disposed in a radial direction of the gas pipe and connected to the gas pipe at a constant interval in a circumferential direction; A circular pipe connecting the plurality of straight pipes to each other while communicating with the differential pressure transmitter; And a drain pipe extending to a lower portion of the circular pipe and discharging condensed water generated in the gas pipe to the outside. It provides a differential pressure detection device for a gas pipe comprising a.
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