API 510 Mechanical Clamp for Temporary Repair

Repair of Pressure Vessel – Mechanical Clamp;  Mechanical Clamp can be used to repair leaks Pressure Vessel temporary (Temporary repair) by using the Patch Plate Holder with Bolts / Nuts tightly and Inject substance Sealant to prevent Fluid leaks out along the edge of the Patch Plate. In an example of the Mechanical Clamp and Pressure Vessel (deaerator) with Steam leak as below: Continue reading API 510 Mechanical Clamp for Temporary Repair

Slip-on Flange ASME B31.3 limitation

Slip-on Flanges Limits per ASME B31.3;  In the ASME B31.3 Piping Code, restrictions on slip-on flanges are specified as follows:  Use welding Double-Welded for  Service that causes Severe erosion, Crevice corrosion, and Cyclic loading  Service that is combustible, toxic and harmful to people  Service at temperatures below -101 C 2. Do not Slip-on Flanges with Service with high pressure than ASME B16.5 Flange Class 2500. 3. Avoid  Slip-on Flanges with  Service that changes the temperature up – downtime (, Many the Large Temperature Contact of Cycle), especially with  Flanges are not covered  Insulation, which will cause a change in the temperature of the  Flange and.  Pipe quickly and may lead to thermal fatigue cracking … Continue reading Slip-on Flange ASME B31.3 limitation

Corrosion Rate calculation (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 Condition 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 (API 510, 570)

Typical location of Corrosion on 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 or corroded, when we knock, Tubes bounce or shake occurs. Likely Location of Corrosion – Heat Exchanger Tubes at Shell Inlet Nozzle (1);  Tubes on the opposite Inlet … Continue reading Typical location of Corrosion on Heat Exchanger

What is Vibration induce cracking

Vibration Induced Fatigue;  Vibration Induced Fatigue is a form of fracture due to fatigue, mechanical (of mechanical Fatigue) due to Dynamic load caused by vibration ( with Vibration) had done so at the risk of Vibration Induced Fatigue is a point there. High stress and severe shaking points. This type of damage is usually found at the small branch connections of Pressure Vessel and Piping, which are naturally high-stress points because they are discontinuous (see Stress Analysis) and are the receiving points. Vibrating force Thus, if the Support inadequate and the Small Branch Connection with Vibration ( for example, near … Continue reading What is Vibration induce cracking

What is Vortex Breaker

Vortex in Vessels;  Vortex, or vortex in Vessels, is the rotation of a liquid’s core while releasing or transferring liquid from Vessels. This appears to be caused by the Earth’s rotation. Vortex can be easily observed. In everyday life, such as flushing the toilet Releasing water from the sink or bathtub Vortex in Vessels will take gas or vapor into the liquid stream that is transferred out. This will make the refining process less efficient, the system has more pressure drop, causing Erosion from the two-phase flow at the nozzle or pipe connecting to the vessel and causing cavitation at … Continue reading What is Vortex Breaker

What is Static Head of vessel

What is “Static Head” in ASME Section VIII Vessels?  In designing the Pressure Vessels according to the ASME Section VIII Division 1, aside from not only considering the design pressure that will occur within the Pressure Vessel, but we also need to consider the weight of the Liquid within the  Vessel acting on it. The pressure caused by the weight of Liquid in Vessel is the “Static Head” which is based on the density of the liquid (Liquid Density called the p) and will have greater value as the height of the liquid from the bottom of the tank or Bottom of … Continue reading What is Static Head of vessel

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

Circumferential vs Longitudinal Stress

Circumferential vs Longitudinal Stress of a Cylindrical Shell in ASME VIII Vessels;  Let’s look at the formula for calculating the Cylindrical Shell thickness of the ASME Section VIII Pressure Vessel. We can see that the Minimum Thickness calculated from Circumferential Stress is approximate twice the thickness calculated from Longitudinal Stress. This is because the Circumferential Stress is twice as much as Longitudinal Stress. Therefore, when calculating Shell thickness, use the formula of Circumferential Stress. Refer to: What is Hoop Stress in pressure vessel? Continue reading Circumferential vs Longitudinal Stress