LOOP ASSESSMENTS | DM LOOP – Seawater to MED Unit

Within the loop assessments, online monitoring technologies are identified which could be potentially integrated with the Utility Units DCS. It is recommended that the Safaniya staff address the cost/benefit of acquiring, implementing, and maintaining the identified technologies against more traditional methods such as process stream sampling and lab assay. Consideration should be given to the rapidity with which a damage mechanism can lead to failure and the proven efficacy of the monitoring technology.

LOOP ASSESSMENTS

In the discussion of on-line monitoring technologies, the Intertek team has indicated specific monitoring devices/systems that could be used for online monitoring of various parameters. The citation of these specific devices is to provide an example of a type of on-line monitoring technology only. The mention of a specific manufacturer or product should not be construed as an endorsement of that company or product by Intertek or the Intertek team.

DM LOOP – Seawater to MED Unit

Loop Description

Seawater from Arabian Gulf is screened at Drum Screen-Seawater intake G26-K-216, filtered and pumped to the MED unit. Before entering the MED unit, seawater is chlorinated and de- chlorinated. Seawater intake pumps G26-G-220A/B are included. Road crossing seawater line is underground.
Equipment & Main Piping

Process Chemistry: Seawater

Process Contaminants: Bacteria/Plankton, etc.
Mitigation & Control: Chlorinated/Dechlorinated. Underground line is cathodically protected

Max Operating Condition: 32oC, 520kPa (90oF, 75psi)
Primary Internal Damage Mechanisms
• General Corrosion
• MIC

Specific Corrosion and IOW/Concern

If biocide dosing and chlorination are insufficient, MIC could occur. There are on-line monitoring systems such as the Emerson Model 499A free chlorine sensor could be used to monitor the Chlorination concentration to insure that the required dosing of 0.5 to 1 ppm is maintained. For Chlorine concentration measurement, equipment similar to could be employed. The primary means of preventing uniform corrosion are cathodic protection (Sacrificial Anode or Impressed Current-ICCP) and Anodic Protection.


 

Other Info

Document Category Accounting
Document Target Users Quisque turpis libero,

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