Close Interval Potentıal Survey (Cıps)
(CIPS) CLOSE INTERVAL POTENTIAL SURVEY; electrolytic direct current (DC) potential measurements made at regular intervals to assess the level of polarization in buried or underwater structures such as steel pipelines. In some sources it is also called the CIS (close interval survey).
(CIPS) The accuracy of Close Interval Potential Surveys has evolved over the past decade as electronic data logger circuits and GPS synchronized current interrupters and survey equipments have been marketed. Each rectifier is providing open, continuous and instant readings with GPS coordinates, time, date and altitude from sea level and the accuracy of the GPS signal.
It is not enough to obtain and to keep it under control 100% of the cathodic protection efficiency of the pipeline from the CP measurement boxes made on average 1 - 2 km. Even when we look at the total length of the pipeline and the number of measurement boxes, it allows us to comment on the cathodic protection of very few areas.
CIPS is used to assess the level of polarization of pipelines when they are protected by a Cathodic Protection system. It is a technique that determines the zones where corrosion can occur and allows us to comment on the entire pipeline. It also allows to reduce the external corrosion present in buried pipelines or to identify and control the damaged areas of coatings. When used with other measurement techniques (DCVG), it allows us to pinpoint stray current dimensions and locations on the pipeline isolation. At the same time, it has a significant ability to identify areas that have a damaged surface coverage on buried surfaces. By this way it will provide information on the development of medium and long-term plans to effectively reduce external corrosion
(CIPS) Close Interval Potential Surveys allow us to find answers to the following critical questions, depending on the survey results.
• Confirmation about compliance of pipeline and CP criteria
• To control the insulation of the pipeline
• Determining electrical continuity
• Determining protection criteria every 2 meters
• Providing control of the pipeline coating condition
Just before the CIPS (Close Interval Potential Survey) measurement is started, the intelligent interrupter which is connected to transformer rectifier is synchronized with the data recorder by setting the ON-OFF period according to the standards.
By the CIP Survey, the observed voltage differences in the ground are registered automatically to the CIPS data recorder via Cu / CuSo4 reference electrodes with conductive copper (enamel coated) wire tied to the CP measurement boxes on the pipeline.
According to the NACE-0207-2007, NACE SP 0502-2008 - NACE TG294 standards, the efficiency and evaluation of cathodic protection are presented to you by direct survey service or practical training.