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Vortex flowmeter design technical standards
- Nov 06, 2017 -

First, the design plan

1, plan?

The meter of the flowmeter is filled out by the application unit. The unit and the production department sign the approval. The electric control department chooses the declaration plan accordingly. ??

2, critical control point?

Sensor caliber selection, appropriate DN300, mainly for the lower limit of the flow of accounting. It is probably with the following conditions should not be lower than the minimum Reynolds number limit Reynolds number ReC2 * 104 and VSF on stress in the lower flow vortex intensity should be greater than the value of the intensity of the vortex sensor to vortex intensity proportional to lift P U2. On the liquid should also look at the minimum working pressure is higher than the working temperature of the full vapor pressure, that is not likely to occur cavitation appearance.

3 flow measurement scale should also check whether it is in the appearance of the best scale of work, that is, the upper limit of the flow of 1/2, 2/3.

Two. Design standards?

The selection and precautions can be considered from five aspects: the five aspects of the flowmeter surface function, fluid characteristics, device conditions, environmental conditions and economic factors. The specific elements of the five aspects are as follows?

1, appearance function accuracy, repeatability, linearity, scale, flow scale, signal output characteristics, echo time, pressure loss and so on

2, the fluid characteristics of temperature and pressure, density, viscosity, chemical corrosion, abrasion and scaling, mixed phase, phase transition, conductivity, velocity, thermal conductivity, specific heat capacity and entropy? 3, device condition pipeline arrangement direction direction detection on the downstream side of the straight pipe length, pipe diameter to repair space power supply, grounding, auxiliary equipment (filter, cancellation), device, etc.?

4, environmental conditions, such as environmental temperature, humidity, electromagnetic interference, safety, explosion protection, pipeline oscillation, etc.

The 5 key elements of the economy, appearance fees, fees, purchase of capital equipment operating expenses, check fees, repairs, spare parts, service life appearance.