Category: OIL & GAS

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What is PRV blowdown?

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With referance to: Pressure Level Relationships chart PRV Testing – Blowdown;  Blowdown is the % difference between Closing Pressure (Reseating Pressure) and Set Pressure. In general, Blowdown is set to 7% for ASME Section VIII and 4-6% for ASME Section I. If the blowdown is too much, PRV Will close slowly and cause a lot of Process Fluid loss. If the Blowdown is too low, PRV will cause a lot of Simmer, which causes Disc and Seat ‘s Valve can damage. Refer to: What is PRV pop test? (Popping test) PRV – Requirement of Overpressure and Blowdown per ASME Section I;  For Pressure … Continue reading What is PRV blowdown?

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Pneumatic Testing Steps of Pressure Vessel (ASME VIII)

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Pneumatic Testing Steps of Pressure Vessel per ASME Section VIII; Pressure testing using the Pneumatic Test according to ASME Section VIII has the following steps: Step 1 to increase the pressure to 50% of required pressure test ( Test, Pressure ). Gradually increase the pressure in steps, stepby 10% of Test pressure until equal to Test pressure. Test the pressure by keeping the pressure at Test pressure fora period of time. Reduce the pressure to Test pressure divided by 1.1 in order to inspect the leak of the Pressure vessel using Visual method. If no leakage is found, reduce the pressure.Complete thePneumatic test Continue reading Pneumatic Testing Steps of Pressure Vessel (ASME VIII)

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What is Profile Radiographic Test

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Profile RT – U Tubes of Heat Exchanger;  For example, Profile RT (Digital) of the U Tubes ( -Heat Exchanger, ), which can be viewed Profile thickness Tube and Profile of Corrosion happens inside Tube Profile RT – Vent Nozzle of Acid Storage Vessel;  Example of Profile RT (Digital) of Vent nozzle of Sulfuric acid storage vessel which can see profile of nozzle thickness and profile of corrosion occurring within the nozzle . Profile RT – Socket Weld Gap; For Socket Weld of Piping, ASME Standard will require Gap , approximately 1.5 mm. This can be checked by the Profile RT (Digital) which made Profile RT can also be used to view a Profile of the thickness of the pipes, In. Service is also possible Profile RT for CUI Inspection ; Today share a Case Study, using Profile RT for monitoring Corrosion Under Insulation (CUI) by shooting rays through Insulation occupies Pipe Fitting … Continue reading What is Profile Radiographic Test

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What is Fillet Welded Patch on pressure vessel.

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Repair of Pressure Vessel – Fillet Welded Patch;  Fillet Welded Patch can be used to repair Pressure Vessel temporary (Temporary repair) by the Patch Plate cover the areas that have been damaged and welded to the Vessel by Fillet Weld This method applies to damage caused by Corrosion or. Erosion which will cause the Vessel ‘s walls to become thinner ( Local Wall Thinning). Repair of Pressure Vessel – Fillet Welded Patch Example 1 (Local Thin Area); Example of repair with a Fillet Welded Patch with a local thin area: Repair of Pressure Vessel – Fillet Welded Patch Example 2 (Through-wall … Continue reading What is Fillet Welded Patch on pressure vessel.

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Pipe support shoe (sliding type) – inspection

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Pipe Supports Inspection – Pipe Shoe off Support;  When checking piping, be sure to check the position of Pipe Shoes to see if they are still in the right position or if they fall out of support like below: Pipe Supports Inspection – Fix Pipe Shoes off Support;  In the event that the pipe shoe is dropped from the support, it can be resolved by expanding the support structure to support the thermal expansion. Continue reading Pipe support shoe (sliding type) – inspection

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How to inspect steam trap on piping system

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Steam Trap Inspection – Visual and Sound Summary for relieve open system; To check the Steam Trap, an Open System by observing ( the Visual ) function and sound ( A Sound) to indicate a malfunction of Steam Trap or not. Steam Trap Inspection – Visual;  Visual inspection of the steam trap is by looking at the external conditions to see if the steam trap has leaks at various points or not. Second, observe the behavior of the steam trap, which can indicate problems with the steam trap , such as lack of ventilation. Condensate water , large amounts of steam flow out of the steam trap, while the steam trap is closed, live steam ejects, etc Steam Trap Inspection – Overview; Monitoring Steam Trap to determine … Continue reading How to inspect steam trap on piping system

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Steam Trap – Bimetallic type

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Steam Trap – Bimetallic;  The Bimetallic Steam Trap uses the Thermostatic principle of the unequal expansion of two metals (Bimetallic) at high temperatures to open and close the Condensate drain valve . When high-temperature Steam comes in, the Bimetal disk will heat and bend. Causes the stem to move upwards to close the valve, but if condensate water gets trapped in a steam trap , the condensate ‘s water temperature will gradually decrease until the Bimetal disk comes back straight and causes the stem to slide down to open Valve. Continue reading Steam Trap – Bimetallic type

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Pressure Level Relationships chart

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PRV – Pressure Level Relationships;  The relationship between the pressure levels of the Pressure Relief Valves (PRVs) on the left side and the pressure on the right side of the system. See What is Set pressure: What is Cold Differential Test Pressure (CDTP) See What is Set pressure/ Accumulation Pressure: What is accumulation pressure of PRV, PSV? See What is MAWP: What is MAWP of pressure vessel (ASME VIII) See What is Popping test: What is PRV pop test? (Popping test) See What is Blowdown: What is PRV blowdown? See What is Simmer phenomena: What is simmer of valve (PRV/PSV)? See What is MAWP: What is … Continue reading Pressure Level Relationships chart

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What is PRV Seat leakage (tightness) test?

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PRV Testing – Seat Tightness Test (Leakage Test);  Seat Tightness Test or Leakage Test is a leak test between Seat and Disc of Pressure Relief Valves (PRV) which will be done after Pop test by maintaining PRV ‘s Inlet pressure at 90% of Set Pressure and counting bubbles. Caused by air or nitrogen leak through Seat and Disc come out. PRV Testing – Example of Seat Tightness Test (Leakage Test);  An example of setting up equipment for the Seat Tightness Test or Leakage Test of Pressure Relief Valves (PRV) PRV Testing – Acceptance Criteria for Seat Tightness Test (Leakage Test);  In … Continue reading What is PRV Seat leakage (tightness) test?