Avoidance of Obstructions: The coupon should be positioned in the location where It is far from obstructed by other parts or structures throughout the process.
(An alternative choice for pipeline and corrosion engineers to take into account is reducing the MAOP for that area of pipe. That would cut back the part of the pipe wall thickness demanded for stress containment, but would increase the portion of the pipe wall thickness for the corrosion allowance. Having said that, this selection really should only be used extremely judiciously.)
EM coupons are very polished coupons that happen to be faraway from the process and so are examined with scanning electron microscopy.
LPR approaches needs to be useful for measuring standard corrosion—not pitting corrosion. The LPR procedure necessitates conductive solutions around the electrodes and is effective very best when the answer is hydrocarbon no cost [10]. LPR probes have Traditionally not been advised about ER probes for measuring corrosion prices in oil or gas units, that are predominantly hydrocarbon based, and also have small drinking water cuts [ten].
Figure 28.three ER probe connected to remote details collector. Note the cable linked to a probe Situated in addition to this pipe. The cable connects to your remote details collector, that may be programed to measure the corrosion rate at typical intervals, like every single 15 min, hourly, everyday, weekly, and the like. When the handheld system is connected to the distant information collector, the archived facts may be retrieved for analysis.
Also, make sure the coupon or ER probe is thoroughly wetted by any liquids flowing from the pipeline. Even more, Be certain that any flush mounted coupon or ER probe that's mounted over the diameter of the pipeline is not so near to the inside bottom from the pipe as to make an artificial crevice.
Maintenance specifications: The linked mother nature of probes implies they may require additional consideration in terms of upkeep and calibration to be sure they offer quite possibly the most accurate details. By comparison, coupons commonly require minor to no maintenance right until They're retrieved with the pipeline.
Price tag: Corrosion coupons are normally less click here costly than corrosion probes, as They can be only utilized for a brief timeframe prior to being replaced. Corrosion probes, Then again, need a a lot more important expense with regard to equally hardware and application.
The reduction in mass above the publicity interval is used to ascertain The interior corrosion fee. If pits are observed within the steel coupons at the conclusion of the publicity period, then a pitting fee will be based upon the depth of the deepest pit plus the exposure interval [four, 9].
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