How to do it to facilitate the maintenance of the gas flowmeter in the later stage?

How to do it to facilitate the maintenance of the gas flowmeter in the later stage? It is best to install the gas flowmeter indoors. If it must be installed outdoors, rainwater, flooding and sun exposure should be avoided, and moisture-proof and sun-proof measures must be taken. The flowmeter should be avoided to be installed in an environment containing corrosive gases. When it must be installed, ventilation measures must be taken. How to do it to facilitate the maintenance of the gas flowmeter in the later stage? For the convenience of installation, maintenance and maintenance, there should be sufficient installation space around the flowmeter. In order to facilitate the maintenance of the gas flowmeter in the later stage, these tasks must be done well. The installation requirement of the electromagnetic flowmeter is that it must be installed at the low point of the pipeline or the vertical section of the pipeline, but it must be in the case of a full pipe. It is the first 5D and the last 3D, so as to ensure the use of the electromagnetic flowmeter and the accuracy requirements. Installation method 1) It should be installed at the lower part of the horizontal pipe and vertically upward, avoiding installation at the high point of the pipe and vertically downward; 2) It should be installed on the rising part of the pipe; 3) It should be installed on the open discharge pipe At the lower part of the pipeline; 4) If the drop of the pipeline exceeds 5m, install an exhaust valve downstream of the sensor; 5) Install a control valve and a shut-off valve downstream of the sensor, and the front 130, the middle 2329, and the rear 0389 can be connected. 6) The sensor cannot be installed at the inlet and outlet of the pump, but should be installed at the outlet of the pump; 1. Requirements for the external environment 1.1. The flowmeter should not be installed in places where the temperature changes greatly or is exposed to high-temperature radiation from the equipment. If it must be installed, measures for heat insulation and ventilation must be provided. The measurement principle of the electromagnetic flowmeter does not depend on the characteristics of the flow rate. If there is a certain amount of turbulence and vortex in the pipeline in the non-measurement area (such as: elbows, tangential flow restrictions, or half-open stop valves upstream), it will be related to the measurement irrelevant. If there is a steady-state eddy current in the measurement area, it will affect the stability and accuracy of the measurement. At this time, some measures should be taken to stabilize the flow velocity distribution, increase the length of the front and rear straight pipe sections, use a stable flow rate, and reduce the measurement point. section. Requirements for process pipes The flowmeter has certain requirements for the upstream and downstream process pipes of the installation point, otherwise the measurement accuracy will be affected. a. The inner diameter of the upstream and downstream process pipes is the same as that of the sensor, and should meet: 0.98DN≤D.≤1.05DN (where DN: sensor inner diameter, D: process tube inner diameter) b. The process tube and the sensor must be concentric, and the coaxial deviation should not be greater than 0.05DN 1.2. Requirements for bypass pipe In order to facilitate the maintenance of the flowmeter, it is best to install a bypass pipe for the flowmeter. In addition, for heavily polluted fluids and flowmeters that need to be cleaned and the flow cannot be stopped, a bypass pipe must be installed. 1.3. The installation site of the flowmeter should avoid magnetic fields and strong vibration sources. If the pipeline vibrates greatly, there should be supports for fixing the pipeline on both sides of the flowmeter. 2. Pipeline electromagnetic flowmeter 2.1. Requirements for straight sections In order to improve the influence of eddy current and flow field distortion, there are certain requirements for the length of the front and rear straight pipe sections installed by the flowmeter, otherwise the measurement accuracy will be affected (rectifiers can also be installed, try to avoid close to the regulating valve and half-open valve installed afterwards). When the electromagnetic flowmeter is widely used in many industries, it mainly uses the principle of Faraday's electromagnetic induction. It is composed of a flow sensor and a transmitter. It is suitable for measuring the volume flow of conductive liquids and slurries in closed pipelines, such as clean water, Sewage, various acid-base salt solutions, mud, ore pulp, pulp and food liquids, etc. a. Facilitate the maintenance of the flowmeter b. For heavily polluted fluids must be installed c. The flow cannot be stopped and the flowmeter needs to be cleaned. 3. Insertion type electromagnetic flowmeter installation requirements 3.1. Requirements for Straight Pipes Inlet/Outlet Straight Pipes: The inlet should be≥10×DN; the export should be≥5×DN 3.2. Requirements for the grounding point In order to make the instrument work reliably, improve the measurement accuracy, and not be disturbed by the external parasitic potential / the sensor should be well grounded, and the grounding resistance should be less than 10. (If the metal pipe is well grounded, there is no need to set up a special grounding device) 3. 3 Requirements for the installation position. Insert the electromagnetic flowmeter as shown in the figure. According to the situation of the pipeline on site, the flowmeter without ball valve should be installed on the pipeline without pressure (that is, the installation without pressure can choose not to install the ball valve. Flow meter), the diameter of the opening on the pipe is 50, and the connecting welded pipe is to be welded on the opening of the pipe; for occasions that require continuous flow loading and unloading or where the medium is not allowed to overflow, a ball valve must be installed, that is, a plug-in type with a ball valve structure is selected. Electromagnetic flowmeter; the diameter of the opening on the pipeline is 50, and the connecting welded pipe is ready to be welded on the opening of the pipeline.

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