Pipeline flowmeter | What is the purpose of having a flowmeter on the return pipe of a fire hydrant

『Pipeline flowmeter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)

1. Pipeline calculation and flow measurement

1. Pipeline calculation There are two types of pipelines: simple pipelines and complicated pipelines. Simple pipeline refers to a single pipeline composed of one diameter of pipe; And cumbersome pipelines are series pipelines connected by pipes of different diameters, or parallel pipelines and branch pipelines composed of several simple pipelines in parallel. The calculation of complicated pipelines is based on the calculation of simple pipelines. This section only discusses simple pipeline calculations. Pipeline calculation is actually the specific application of continuity equation, Bernoulli equation, and energy loss calculation formula. Due to the difference between known and unknown quantities, the calculation method also changes accordingly. The commonly encountered pipeline calculation problems in practical work can be summarized into the following three situations:

(1) Given the diameter, length, fittings, and valve settings of the pipeline, as well as the fluid delivery volume, the energy loss of the fluid passing through the pipeline system can be calculated to further determine the output power of the conveying equipment, the pressure inside the equipment, or the relative position between equipment. This type of calculation is relatively easy, as discussed earlier.

(2) Given the diameter, length, fittings, and valve settings, as well as the allowable energy loss, calculate the fluid velocity or flow rate. (3) Given the pipe length, equivalent length of fittings and valves, fluid flow rate, and allowable energy loss, calculate the pipe diameter. There is a common problem in the latter two cases, that is, the flow velocity v or pipe diam

eter d is unknown, so the Reynolds number Re value cannot be calculated, and the flow pattern of the fluid cannot be determined, so the friction coefficient μ cannot be determined. In this case, the trial and error method or other methods are often used in engineering calculations to solve it. Below is an example to introduce the application of the trial and error method. Example 1-6, as shown in the attached figure of this question, water is led from the water tower to the workshop through a steel pipe with a diameter of 114 × 4mm, with a total length of 150m (including the equivalent length of pipe fittings and valves, but excluding the equivalent length of inlet and outlet losses). The water tower is maintained constant by the water surface and is 12 meters above the drainage outlet. When the water temperature is 12 ℃, the water delivery capacity of this pipeline is several m3/h. Example 1-6 Diagram: Taking the water surface inside the tower as the upstream section 1-1 , and the outer side of the drainage pipe outlet carefully excavated as the downstream section 2-2, and using the center of the drainage pipe outlet as the reference horizontal plane. The Bernoulli equation is presented between two cross-sections, where z1=12m, z2=0v1=0v2=0p1=p2 in the non-metallic mineral processing machinery equipment formula. By substituting the above values into the Bernoulli equation, the flow velocity of water in the pipeline is obtained as follows: non-metallic mineral processing machinery equipment. Although there are only two unknowns μ and v in the above two equations, v cannot be solved yet. Due to the fact that the specific functional relationship of equation (b) is related to the flow pattern of the fluid, and v is currentl

Pipeline flowmeter | What is the purpose of having a flowmeter on the return pipe of a fire hydrant

1. Pipeline calculation and flow measurement

『SILVER Official Website SERVICE』