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E.M.I Effects of Cathodic Protection on Electromagnetic Flowmeters

View Article: PubMed Central

ABSTRACT

Electromagnetic flowmeters are used to measure the speed of water flow in water distribution systems. Corrosion problem in metal pipelines can be solved by cathodic protection methods. This paper presents a research on corruptive effects of the cathodic protection system on electromagnetic flowmeter depending on its measuring principle. Experimental measurements are realized on the water distribution pipelines of the Izmir Municipality, Department of Water and Drainage Administration (IZSU) in Turkey and measurement results are given. Experimental results proved that the values measured by the electromagnetic flowmeter (EMF) are affected by cathodic protection system current. Comments on the measurement results are made and precautions to be taken are proposed.

No MeSH data available.


Flowmeter with grounding plates and ground.
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f7-sensors-07-00075: Flowmeter with grounding plates and ground.

Mentions: When installing an electromagnetic flowmeter in pipelines with cathodic protection, some specific conditions must be taken into account. The sensor and the medium must have roughly the same electrical potential to ensure that the measurement is accurate and no electrical erosion takes place at the electrodes. Normally the reference electrode in the sensor or the metal pipe ensures that the potentials are equalized [15, 16]. The transmitter must be supplied through an isolation transformer for compact mounting. The EMF should be installed with grounding plates, located between flanges, up- and downstream of the flowmeter which are insulated from the pipeline in order to provide a shunt path for the Cathodic Corrosion Protection (CCP) potential for pipelines with interior insulating liners. The grounding plates up- and downstream of the EMF are at the ground potential (Figure 7).


E.M.I Effects of Cathodic Protection on Electromagnetic Flowmeters
Flowmeter with grounding plates and ground.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3756713&req=5

f7-sensors-07-00075: Flowmeter with grounding plates and ground.
Mentions: When installing an electromagnetic flowmeter in pipelines with cathodic protection, some specific conditions must be taken into account. The sensor and the medium must have roughly the same electrical potential to ensure that the measurement is accurate and no electrical erosion takes place at the electrodes. Normally the reference electrode in the sensor or the metal pipe ensures that the potentials are equalized [15, 16]. The transmitter must be supplied through an isolation transformer for compact mounting. The EMF should be installed with grounding plates, located between flanges, up- and downstream of the flowmeter which are insulated from the pipeline in order to provide a shunt path for the Cathodic Corrosion Protection (CCP) potential for pipelines with interior insulating liners. The grounding plates up- and downstream of the EMF are at the ground potential (Figure 7).

View Article: PubMed Central

ABSTRACT

Electromagnetic flowmeters are used to measure the speed of water flow in water distribution systems. Corrosion problem in metal pipelines can be solved by cathodic protection methods. This paper presents a research on corruptive effects of the cathodic protection system on electromagnetic flowmeter depending on its measuring principle. Experimental measurements are realized on the water distribution pipelines of the Izmir Municipality, Department of Water and Drainage Administration (IZSU) in Turkey and measurement results are given. Experimental results proved that the values measured by the electromagnetic flowmeter (EMF) are affected by cathodic protection system current. Comments on the measurement results are made and precautions to be taken are proposed.

No MeSH data available.