Pipeline electromagnetic flowmeter installation requirements

Pipeline electromagnetic flowmeter installation requirements

1,    Straight pipe section requirements

In order to improve the effect of eddy current and flow field distortion, the flow meter is installed on the front and rear straight pipe sections with certain requirements, otherwise it will affect the measurement accuracy (it is also possible to install the flow distributor, and try to avoid after the * near-control valve and half-open valve installation).

Pipe installation type

Installation diagram

Standard pipeline

Straight pipe L

Straight pipe after S

Horizontal Pipe

Figure a

5D

3D

Curve

Figure b

10D

5D

Flaring tube

Figure c

5D

5D

Valve downstream

Figure d

10D

5D

Shrink tube

Figure e

5D

2D

Pump downstream

Figure f

15D

5D

Mixed liquor

Figure g

30D

3D

2,    Process tube requirements

Flowmeters have certain requirements for installing upstream and downstream process tubes; otherwise, the measurement accuracy will be affected.

a.         The inner diameter of the upstream and downstream process tubes is the same as the inner diameter of the sensor and should satisfy: 0.98DN≤D≤1.05DN (where DN: sensor inner diameter, D: process tube inner diameter)

b.         Process tube and sensor must be concentric, coaxial deviation is not greater than 0.05DN

3, the requirements of the bypass channel

In order to facilitate overhaul of the flowmeter, it is better to install a bypass channel for the flowmeter. In addition, if the heavy pollution fluid and the flowmeter need to be cleaned and the fluid cannot be stopped, the bypass channel must be installed.

4, in accordance with the requirements of the flowmeter on the pipeline

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