Description of the requirements for the installation of straight pipe sections for V-cone flowmeters

V cone flowmeter installation straight pipe section requirements: First of all, note that the sensor itself can not be used as a load support point, it can not support the adjacent working pipe, there should be a pipe bearing the weight bearing. In order to obtain normal measurement accuracy, the V-cone flowmeter also has a length of straight pipe section upstream, but its length is lower than that of most other flowmeters. 90o elbow, T-shaped pipe, concentric reducer, full-opening valve, 5 pipe diameter (5D) length straight pipe section from the flange end of the sensor inlet end, 10D for different opening valves; downstream straight pipe section (2~3) D; however, prevent the butterfly valve disc from protruding into the sensor measuring tube. The lengths of the upstream and downstream straight pipe sections proposed by various standards or verification procedures are also inconsistent, and some ultrasonic flowmeters are required to be higher than usual. This is due to the requirement to ensure that the current 0.5-level precision instrument is achieved.

V-cone flowmeter installation position and flow direction, sensor installation direction horizontal, vertical or inclined (fluid must flow horizontally or obliquely upward) can be unlimited. When welding or flame cutting the sensor adjacent to the pipe, it is necessary to take isolation measures to prevent the lining from being heated, and it must be confirmed that the instrument converter signal line is not connected to prevent damage to the horizontal installation of the converter so that the electrode axis is parallel to the horizon, not perpendicular to Horizon, because the electrode at the ground is easily covered by deposits, the top electrode is easily wiped by the occasional bubbles in the liquid to cover the surface of the electrode, causing the output signal to fluctuate. For the installation of negative pressure piping, the fluoroplastic lining sensor shall be used with caution in the negative pressure piping system; the positive pressure piping system shall prevent the generation of negative pressure, for example, the piping system whose liquid temperature is higher than room temperature, after the sensor is closed, the upstream and downstream shut-off valves are stopped. The fluid cooling shrinkage will form a negative pressure. The negative pressure prevention valve should be installed near the sensor. The absolute pressure required for the pressure of the PTFE and PFA plastic lining applied to the negative pressure piping system at 200C, 1000C, and 1300C must be separately specified by the manufacturer. Greater than for non-conductive piping, the grounding flange is clamped between the sensor flange and the pipe flange. However, it is necessary to ensure that the measuring tube is coaxial with the process pipe. The axis deviation must not exceed 2MM. The V-cone flowmeter measures the solid-liquid two-phase fluid preferably in a vertical installation, especially in sewage flow metering, flowing from bottom to top. This can avoid the disadvantages of severe local wear of the lower half of the lining during horizontal installation and solid phase precipitation at low flow rates.

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