There are 4 main reasons that cause corrosion in heat exchangers to need to be concerned during the inspection: Water impingement, Temperature, Vibration, Velocity. Refer to: Corrosion in Heat Exchanger Likely Location of Corrosion – Heat Exchanger Tubes at Baffle; Heat Exchanger Tubes in the Baffle Plates area are highly prone to corrosion. Due to the possibility of vibration of the Tubes causing friction with the Baffle (Vibration fretting) or Erosion from Fluid flow in Heat Exchanger For smaller tubes, The corrosion of the Tubes on the Baffle can be checked using a hammer. If the Tubes in the Baffle area is thin … Continue reading Typical location of Corrosion on Heat Exchanger
External Evidence of Caustic Leaking; Carbon Steel Piping used for Caustic Service (NaOH content) may be damaged by Caustic Cracking, especially in areas with welded and discrete areas that have high stress. Caustic leaks or leaks from the cracks will look like White salt, which can be seen with the naked eye. Therefore, when doing an external visual inspection for Caustic Piping, don’t forget to look for “White Salt” which is an Evidence that indicates that our Caustic pipe is leaking. External Evidence of Caustic Leaking – Caustic Cracking on Socket Welded Piping; Example of Caustic leakage from Caustic (NaOH) Injection Piping … Continue reading What is Caustic corrosion cracking
Soil to Air Interface – Zone of Corrosion on API 570 Piping; The area where the pipelines fall underground, or soil-to-air interface, is the area that has a high chance of external corrosion if Wrapping or Coating is damaged. Due to the difference in temperature, humidity and oxygen in the area, the API 570 stipulates that 6 inches above and 12 inches below the soil surface is the Soil-to-air Interface zone that should be Reviewed. Inspection of Soil-to-air Interface for Underground Piping; For example, to monitor underground pipes ( Underground, Piping) in a pipe underground or Soil-to-air Interface by digging tube down … Continue reading What is Soil Corrosion
Flash Point VS. Autoignition Temperature; Flash Point is the lowest temperature at which a material or substance ( Flammable materiales) vapors ( Vapor was) enough to be flammable when mixed with air (Air) and a power source ( With The the Source, Ignition). Autoignition Temperature is the temperature at which the vapor of materials or substances ( Flammable materiales) can spontaneously ignite when mixed with air (Air) without a power source ( online Without the Source, Ignition). For example, Gasoline can ignite from a temperature of 43 degrees Celsius (Flash Point). If sparks occur And can ignite spontaneously at temperatures from 280 degrees Celsius ( … Continue reading Flash point, Boiling Point, and Autoignition point.
Vessel and Tank Inspection – Rubber Lining Inspection; Within the Piping, Vessel or Tank, some will be done with Lining or Coating to Prevent Corrosion and Erosion. During inspection (in-service), damages that will occur to the Lining, such as separation, breakage, swelling. If we find that Lining damage. We have to dismantle the lining to check for damage to the metal surface of the Vessel beneath the lining (in the picture is an example of the Rubber Lining inside the tank that is very cracked and swollen, and the Corrosion that occurs on the metal surface of the tank under the Rubber Lining) Continue reading Vessel rubber lining inspection
Likely Location of CUI for Vessels – Bottom of Horizontal Vessel; The risk area for the Corrosion Under Insulation (CUI) for the Pressure Vessel, which is horizontal (Horizontal) is the bottom (Bottom) of the Vessel, which is where water will be trapped under the Insulation. CUI on Insulation Support Ring of Vertical Vessel and the Design for Minimize CUI; In an example of the result is corrosion An Under Insulation (CUI) Downtown Insulation Support Ring Of Vertical Vessel , especially the Support Ring in the zone below. When water is added to the Insulation of water to flow down by gravity. And imprisoned in the Insulation Support Ring makes the atmosphere remove this happen CUI violence. The design method to reduce … Continue reading Typical location of CUI corrosion on Pressure Vessel and Storage Tank
Likely Location of CUI for Piping – Penetration or Breach in the jacket (Vents); The Line Vents area of Carbon Steel Piping is one area that has a higher chance of CUI being stronger than other areas. Because this area will have the joints of the Insulation Jackets at the top (Top) of the pipes, which water will be able to penetrate easily if the Seal of the Insulation Jackets begin to deteriorate. Design of Termination of Insulation for CUI Protection (Piping); The design and method of insulation is very important in preventing water, which causes Corrosion Under Insulation (CUI) to not go … Continue reading Typical location of CUI corrosion in piping system
Oxygen Scavenger (Corrosion Inhibitor); Oxygen Scavenger is a chemical used to inhibit Corrosion one that removes Oxygen in reaction Corrosion by being put into the water Boiler feed water to get rid of Oxygen , or from the rest of the Deaerator before release to manufacturing Steam. Continue reading What is Oxygen scavenger?
Profile RT – U Tubes of Heat Exchanger; For example, Profile RT (Digital) of the U Tubes ( -Heat Exchanger, ), which can be viewed Profile thickness Tube and Profile of Corrosion happens inside Tube Profile RT – Vent Nozzle of Acid Storage Vessel; Example of Profile RT (Digital) of Vent nozzle of Sulfuric acid storage vessel which can see profile of nozzle thickness and profile of corrosion occurring within the nozzle . Profile RT – Socket Weld Gap; For Socket Weld of Piping, ASME Standard will require Gap , approximately 1.5 mm. This can be checked by the Profile RT (Digital) which made Profile RT can also be used to view a Profile of the thickness of the pipes, In. Service is also possible Profile RT for CUI Inspection ; Today share a Case Study, using Profile RT for monitoring Corrosion Under Insulation (CUI) by shooting rays through Insulation occupies Pipe Fitting … Continue reading What is Profile Radiographic Test