What is PREN value for pitting corrosion?

Despite its inherent resistance to corrosion, stainless steel tubing installed in a marine environment suffers from different types of corrosion throughout its expected lifetime. Such corrosion can lead to fugitive emissions, lost product, and potential risks. Offshore platform owners and operators can reduce corrosion risks at the outset by specifying more robust tubing materials that offer better corrosion resistance. Later, they must remain vigilant in their inspections of chemical injection, hydraulic, and impulse lines, as well as process instrumentation and sensing equipment, to ensure corrosion isn’t threatening the integrity of the installed tubing and impacting safety. Localized corrosion can be … Continue reading What is PREN value for pitting corrosion?

What is water standards for hydrostatic testing?

Selection and Treatment of Water and Conduct of the Test, to Maintain the integrity of the System is a priority concern in new-building or construction project. Specially on Stainless-steel which is very sensitive to corrosion. 1.0 Introduction Welded fabrications are frequently tested hydrotested for pressure tightness. Unless properly conducted, this procedure can induce problems. It is important to avoid initiating corrosion of the fabrication by subjecting it to critical conditions outside the initial design constraints. Where the vessel is to handle materials which are later ingested, contamination must be avoided. Damage may be caused by the induction of latent corrosion … Continue reading What is water standards for hydrostatic testing?

Is Stainless Steel ferrous metal?

This question has been made through every year when the engineer concerning about ferrous or non-ferrous metal during making of welding procedure, permanent joint qualification or corrosion calculation. This article gives an overview of ferrous metals, what they are and how they’re made. There are several common types of ferrous metals such as mild steel, stainless steel and cast iron. Ferrous metals are highly versatile. Read this article to learn about their applications and advantages and disadvantages of ferrous metals Did you know? Iron is the most abundant element on earth. The earth’s core consists of an iron-nickel alloy that makes … Continue reading Is Stainless Steel ferrous metal?

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)