Pipe with Dual Grade

What is Dual Grade Stainless Steel Pipe: According to ASME BPVC Section II states that control the material characteristics such as mechanical properties (Mechanical Properties), chemical (Chemical, COMPOSITION), the Heat Treatment Through the provision of Grade supplies more than one Grade will be identified as Dual or Multiple Grade. For example, Dual Grade Stainless Steel Pipe, ASME SA-213 TP316 / 316L: Looking at the ASME SA-213 spec, you can see that 316L Low-Carbon Grade is defined to have the Carbon content lower than 316 Standard Grade, and at the same time requires that 316L have Min. Tensile Strength and Min. Yield Strength be lower. (Steel in general, if having less Carbon, will also have low Tensile Strength) This … Continue reading Pipe with Dual Grade

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 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

Steam trap design in piping system

Why does a Steam Heat Exchanger or any Steam Heater have a Steam Trap: 1st reason: On Outlet line, Steam-out of the Heat Exchanger may also heat or condensated at Steam outlet, therefore, a Steam Trap at Outlet line of Heat Exchanger for trap the Steam to condense into water  before forwarding it to condensate main line (Saving Steam). 2nd reason: The Steam on the Heat Exchanger may be Water Condensate contaminated, so they have to set Steam Trap with Steam Inlet line to prevent damage from Two-phase flow steam erosion occurred in Heat Exchanger. (Corrosion/Errosion Protection) Example of Steam … Continue reading Steam trap design in piping system

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

ASME B16.5 Flange Marking Explanation

ASME B16.5 Flange Marking;  Marking (Stamp) on the flange according to the requirements of the AMSE B16.5 Pipe Flanges and Flanged Fittings Standard must include the size of the Flange, Flange Rating Class, the symbol “B16” or “B16.5”, Material Specification, and Manufacturer’s name. 1: Size of Flange (NPS), Ex. 4″; See: PIPING/TUBING CONFIGURATIONS 2: Class of Flange, Ex. 150, 300, 600; See: FITTING PRESSURE RATING CLASS 4: Standard, Ex. B16 or B16.5 5: Material specification, Ex. SA A182 F304/304L; See: ASME B16.5 FLANGE MATERIAL GROUP Others: 6. Heat No, Ex: CR47 7. Trade Mark, Ex: CE, KOR, VN ect., Continue reading ASME B16.5 Flange Marking Explanation

Test Pressure vs MAWP (ASME VIII)

Hydrostatic Test Pressure vs MAWP of Section VIII Vessels;  An example of Hydrostatic Test Pressure compared to the MAWP of Pressure Vessel ( in the form of Shell & Tube Heat Exchanger) designed according to ASME Section VIII Div.1. What is Hydrostatic Test Pressure for Section VIII Vessels; The Hydrostatic Test of Pressure Vessel according to the ASME Section VIII Div.1 must be done at a pressure not less than 1.3 times of the Maximum Allowable Working Pressure (MAWP) of the Vessel multiplied by the Stress Ratio to compensate for the strength of the material. In case of use at high temperatures ( when Hydrotest is made at Ambient Temp.) , The Stress Ratio is the ratio of the Allowable Stress of the material to … Continue reading Test Pressure vs MAWP (ASME VIII)