Corrosion in Heat Exchanger

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: Typical location of Corrosion on Heat Exchanger Cooling Water Corrosion in Heat Exchanger Tubes at High Water Temperature Zone; Another important factor affecting Corrosion in Heat Exchanger Tube Service at Cooling Water is the temperature. The area where the Cooling Water has a high temperature ( on the Outlet side ), there will be more fouling and corrosion than the low-temperature area. In the example, you can see from the corrosion that occurred in front of … Continue reading Corrosion in Heat Exchanger

Elbow corrosion in the piping system

When we find that Erosion or Erosion-Corrosion Occurs in our piping system. Elbow area is one of the points where Flow hits and causes Erosion / Erosion-Corrosion. The simple way of looking at the wear (Eroded) or the thickness of the Elbow lost (Local-Thin Area) is the Grid UTM (Ultrasonic Thickness Measurement). This method will. This allows us to obtain both the profile of the remaining Elbow thickness and the ability to find the lowest thickness in the area by looking at the Thickness Profile obtained.   In another example of the Grid UTM area Outside radius of Elbow before the … Continue reading Elbow corrosion in the piping system

Corrosion Rate calculation for pressure vessel and piping (API 510, 570)

Corrosion Rate for New Vessel and Service Change per API 510;  According to API 510, “Corrosion Rate” for Pressure Vessel to be reinstalled or Pressure Vessel is changed. Service Conditions can be obtained. Use the Corrosion Rate of the Vessel that has the same or similar Service Condition The Corrosion Specialist is the person who estimates Or estimates the value from the published data such as API 581. Use the double thickness measurement to calculate the corrosion rate by the first time after the Vessel service for 3-6 months and the second time according to the appropriate period so that the value can be estimated Corrosion Rate.     Corrosion Rate for New Piping and Service Change … Continue reading Corrosion Rate calculation for pressure vessel and piping (API 510, 570)

Typical location of Corrosion on Heat Exchanger

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

What is Caustic corrosion cracking

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

What is Soil Corrosion

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, Boiling Point, and Autoignition point.

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 rubber lining inspection

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

Typical location of CUI corrosion on Pressure Vessel and Storage Tank

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