Category: OIL & GAS

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Test Pressure vs MAWP (ASME VIII)

Amarine Antonio

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)

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What is PRV valve Trevitest ?

Amarine Antonio

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 ?

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What is PRV Field Test?

Amarine Antonio

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?

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What is PRV Set Pressure Tolerance

Amarine Antonio

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

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What is Holiday Test ?

Amarine Antonio

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 ?

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Typical location of CUI corrosion on Pressure Vessel and Storage Tank

Amarine Antonio

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

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Typical location of CUI corrosion in piping system

Amarine Antonio

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

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How PRV action and Maintenance understanding.

Amarine Antonio

Preview on PRV – Valve Action VS Inlet Pressure; Operation (open – closed) Pressure Relief Valve (PRV) compared to the pressure in the system (Inlet Pressure of PRV) describing as below chart: To understand above actions, firstly see the relationship of pressure levels and the definition of each acting term: Pressure Level Relationships chart Then, how to test the valve correctly by below topics: What is PRV pop test? (Popping test) What is PRV Seat leakage (tightness) test? What is Backpressure testing of PRV?             Continue reading How PRV action and Maintenance understanding.

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What is Backpressure testing of PRV?

Amarine Antonio

PRV Backpressure Testing; Speaking of PRV testing, everyone knows (1) Pop Test or Set Pressure Test. It is a test whether PRV can open at Inlet Pressure as set and or (2) Seat Tightness Test, which we call Leak Test, which is the test of leakage between Disc and Seat of PRV after Pop Test. But for Closed Bonnet PRV in a closed system and does not require Fluid is leaking to the outside (Discharge to Closed System) must be made Backpressure Test on Requirement of ASME BPVC Section VIII, Div.1 The Backpressure Test is a compressed air or gas at a pressure of at least 2 bars. Go from the outlet side of the PRV to see if the Body, Bonet, Bellow, including Gasketed Joint and Connection are leak or not. Which we will use soapy water to … Continue reading What is Backpressure testing of PRV?