Methanol flowmeter

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What are the optional size specifications for methanol flow meters? The mainstream size specifications for methanol flow meters cover DN15~DN2000, which need to be determined based on the type of flow meter, operating flow rate, and pipeline parameters.

1. General size selection interval 1 Small flow scenarios: DN15~DN50, suitable for small diameter conveying scenarios such as sampling pipelines and small filling lines in workshops; 2. Medium flow scenario: DN65~DN300, which is the mainstream fitting size for the methanol main pipeline in the factory area; 3. High flow scenarios: DN350~DN2000, suitable for ultra large caliber working conditions such as dock unloading and long-distance methanol pipelines.

2. Size adaptation limitations for different types of flow meters: (1) Vortex flow meters: suitable for DN15~DN300, measurement accuracy will significantly decrease after exceeding DN300, and can only be used for measuring volume in non-conductive media (such as anhydrous methanol);

; （2） Electromagnetic flowmeter: suitable for DN10~DN2000, but can only be used for measuring industrial methanol containing trace conductive impurities. Anhydrous methanol cannot be used; （3） Coriolis mass flowmeter: suitable for DN10~DN300, with the highest measurement accuracy, mostly used in trade settlement scenarios, and relatively high cost; （4） Rotary flowmeter: only suitable for small flow sampling and measurement of DN15~DN50, mostly used in laboratories or trace conditions.

III. Selection and Use Constraints 1 Flow range constraint: It is necessary to ensure that the actual working flow rate is within the optimal range ratio range of the selected flow meter (usually 10%~100% of the rated flow rate), in o

rder to avoid accuracy failure at low flow rates; 2. Medium adaptation constraints: Anhydrous methanol should avoid electromagnetic flow meters and use instruments such as vortex street and Coriolis mass flow meters that are adapted to non-conductive media. The corresponding size range should be adjusted according to the type of flow meter; 3. Safety installation constraints: Methanol is a flammable chemical medium, and the installation of flow meters should be completed by personnel with chemical pipeline operation qualifications to avoid safety risks caused by medium leakage.

2. What are the measurement methods and conditions for methanol?

The commonly used methods for determining methanol are chromogenic acid colorimetry and gas chromatography.

1. Gas Chromatography [

1,2] (1) Principle: Methanol in air is adsorbed on a silica gel sampling tube, washed with water, separated by a GDX-102 chromatographic column, and determined by a hydrogen flame ionization detector. Qualitative retention time and quantitative peak height are used.

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