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)

What is PRV valve Trevitest ?

PRV Testing – Trevitest (Principle);  Trevitest Test Set Pressure of the Pressure Relief Valve (PRV) with On-Line while PRV are In-Service without adding (Build up) the pressure in the whole system approaching the Set Pressure. The Trevitest test kit uses the Hydraulic Lift Assist Device to help push the spindle of the PRV to overcome the spring force without increasing the pressure in the system and calculate the set pressure of the PRV using the pressure in the system. PRV Testing – Trevitest (Tools Setup); Examples of tools and installation of Trevitest test  kits installed on the Pressure Relief Valve at the site:   PRV Testing – Trevitest (Result Interpretation);  Interpretation of Trevitest  test results is done by using the software that comes with … Continue reading What is PRV valve Trevitest ?

What is PRV Field Test?

PRV Testing – Field Test; Test Set Pressure and Seat Tightness Test of Pressure Relief Valve (PRV) at the venue (Field Test) can be performed using a kit for compressed inward, Inlet performed on Nozzle of PRV, which will make the case that PRV is large, located on a high ground, difficult to transport. Refer to: What is PRV pop test? (Popping test) Continue reading What is PRV Field Test?

What is PRV Set Pressure Tolerance

PRV – Set Pressure Tolerances per ASME Section I;  Pressure Relief Valve (PRV) is designed to be opened to release pressure (Relief Overpressure) at Set Pressure is set, which follows the Requirement of ASME Section I Power Boiler to Pressure Relief Valve (PRV) is a deviation ( of Tolerance) of Opening. Pressure from Set Pressure not exceeding the value in the table divided by Set Pressure of the PRV. Refer to: What is PRV pop test? (Popping test) Beside this term, there’s Blowdown and Overpressure Tolerance for PRV testing: Refer to: What is PRV blowdown? Continue reading What is PRV Set Pressure Tolerance

What is Holiday Test ?

Holiday Test – Overview;  A holiday test here refers to defects in coating or lining, which are Pinhole, Void, Crack, Thin Spot or Contaminant.  Holiday Test is a method for checking these defects by providing electricity through the defects in Coating/lining to Workpiece. If any area has a defect, spark or short circuit will occur. Holiday Test will be divided into two(2) main methods. According to the thickness of Coating/lining by Low Voltage or “Wet Sponge” It applies to Coat thickness less than 500 microns of High Voltage or “Spark” is used to Coating thickness greater than 500 microns. Example of understanding the methods: … Continue reading What is Holiday Test ?

Typical location of CUI corrosion in piping system

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