RU2204079C2 - Device for measurement of gas leaks in shut-off fittings by means of vent pipe - Google Patents

Abstract

FIELD: pipe line transport of gas. SUBSTANCE: volume of gas flowing through shut-off fittings via vent pipe is determined by measuring rotational speed of L-shaped tubes hermetically fitted in vent pipe in plane perpendicular to axis of pipe through whose nozzles gas escapes into atmosphere. Proposed device is provided with vertical vent pipe whose inlet is hermetically connected with outlet of shut-off fittings and outlet is provided with protective cap having holes for escape of gas into atmosphere; outlet part of vent pipe is provided with L-shaped tube system in plane perpendicular to axis of pipe; L-tube system is mounted hermetically; it consists of nozzle-like L- shaped tubes rigidly interconnected in Z- shaped pattern; said system is rotatable around axis of vent pipe; interior of nozzle-like tubes forms single gas- evacuating passage connected with interior of vent pipe. EFFECT: enhanced efficiency. 1 dwg

Description

 The invention relates to the field of power engineering and can be used in gas transportation systems at compressor stations, gas distribution stations located near end gas consumers, and other places where gas is released (discharge) through candle tubes into the atmosphere.

 A device for measuring leaks in shutoff valves using a candle pipe, including a device for measuring the volumetric flow rate of gas flowing through the shutoff valves.

 Candle tubes are provided at various parts of the system for ventilation of gas pipe covers at underground passages, emergency gas discharge on the linear part of gas pipelines and purging of equipment and gas pipelines at compressor stations (SU 585362 A, class F 16 K 37/00, 12/25/1977) .

 The technical result of the invention is to provide a device for measuring the volume of leaks of natural gas through leaking valves.

 This is achieved due to the fact that the gas outlet from the spark plug pipe into the atmosphere is organized through nozzles of a Z-shaped rigidly connected nozzle-shaped tube of an L-shaped form, which is tightly installed in the exhaust pipe. The measurement of the rotation speed of the tube system is carried out by an angular velocity sensor.

 The drawing shows a diagram of a device for measuring the volume of gas flowing through the shut-off valve through a candle pipe.

 A device for measuring the volume of gas flowing out through the shutoff valves through the candle pipe contains a vertically arranged candle pipe 1, the inlet of which is hermetically connected to the outlet of the shutoff valves, and the outlet is equipped with a protective cap 2 having openings 3 for gas to escape into the atmosphere. An exhaust system of at least two Z-shaped nozzle-shaped tubes 4 of a L-shaped shape located in a plane perpendicular to the pipe axis with the ability to rotate clockwise or counterclockwise, bearing 5, bearings 6 and angular velocity sensor.

 The operation of the device is as follows. Gas flowing through the shut-off element passes through the candle pipe 1 to the outlet, where a system of L-shaped tubes is hermetically installed. As the gas accumulates in the candle tube 1, excess pressure is generated, as a result, gas flows out through the nozzle tubes 4, a reactive moment arises, which leads to the rotation of the tubes 4. In this case, the gas exits through the openings 3 into the atmosphere. The speed of rotation of the nozzle tubes is in direct proportion to the amount of leakage.

где Q_г - объемный расход, м³/с;
I - приведенный момент инерции вращения сопловидных трубок относительно оси трубы, кг/м²;
f - циклическая частота вращения трубок, с^-1;
ρ_г - плотность газа, кг/м³;
R - радиус расположения осей сопел трубок относительно оси свечной трубы, м.The volumetric flow rate of the outflowing gas Q _{g is} calculated by the formula:

where Q _g - volumetric flow rate, m ³ / s;
I - reduced moment of inertia of rotation of the nozzle tubes relative to the axis of the pipe, kg / m ² ;
f is the cyclic frequency of rotation of the tubes, s ^-1 ;
ρ _g - gas density, kg / m ³ ;
R is the radius of the axis of the nozzles of the tubes relative to the axis of the spark plug pipe, m

 The system of nozzle tubes 4 has the ability to rotate around the axis of the candle tube, and the internal volumes of the nozzle tubes form a single gas outlet path connected to the internal volume of the candle tube.

Claims (1)

A device for measuring gas leaks in valves using a candle pipe, containing a device for measuring the volumetric flow rate of gas flowing through the valves, characterized in that in a vertically located candle pipe, the entrance to which is hermetically connected to the outlet of the valves, and the outlet is equipped with a protective cap having openings for gas to escape into the atmosphere, in its outlet part, a plane perpendicular to the pipe axis, a system of Z-shaped rigidly connected nozzle-shaped tubes of the L-shaped forms that can rotate around the axis of the candle tube, and the internal volumes of the nozzle tubes form a single gas outlet path connected with the internal volume of the candle tube, and the volumetric flow rate of the outgoing gas

where Q _g - volumetric flow rate, m ³ / s;
I - reduced moment of inertia of rotation of the nozzle tubes relative to the axis of the pipe, kg • m ² ;
f is the cyclic frequency of rotation of the tubes, s ^-1 ;
ρ _g - gas density, kg / m ³ ;
R is the radius of the axis of the nozzles of the tubes relative to the axis of the spark plug pipe, m