A waste treatment specialist company in France was using differential pressure (DP) transmitters to measure and control the level within their two steam drums. However, after a recent review, the plant’s insurers were concerned that if the DCS was to fail, the DP measurement would be lost and there would be no way of knowing the level within the steam drum. This could lead to the steam drum running dry, or rising level and water entering the steam turbine, both critically dangerous situations. The insurers insisted on an additional measurement on the steam drum which would be independent of the DCS.
Emerson proposed the MobreyTM Hydrastep Electronic Steam and Water Gauging System, a product designed specifically for this application. One Hydrastep system was fitted to each steam drum. The two-input board option was chosen for dual redundancy; should one board fail, the other would continue to operate and provide a level measurement.
The Hydrastep is capable of interfacing with the DCS, but it was decided to keep it independent in case the DCS was to fail. Remote displays were positioned in the control room to give a clear and continuous indication of the level in each drum.
The plant’s insurers were content that the Hydrastep would give a reliable level measurement and would enable the customer to continue the safe operation of their plant. Read more herehttp://bit.ly/2lGVLfF