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  • Users: Inchtain
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  1. Inchtain

    Vessels Manways

    According to the relevant standards and codes, is there a minimum recommended diameter for a manway e.g. 24 inches." , so that the entry into the vessel can be refused due to safety reasons. Is that also valid for entering pressure vessels for inspection during total shutdown of the Plant...
  2. Inchtain

    Welding Joint Repair

    I would appreciate it if you could inform me whether it is allowed to repair a root defect in an 8" and 12" pipe welding joint from inside of the pipe by chipping off the defect and welding the root pass again. Thanks
  3. Inchtain

    Standpipes

    Hello I would like to know whether the standpipes are considered part of the pressure vessels. Additionally, I wonder if there is any reference for that in international codes/standards?! Thank you for your contribution. Best regards,
  4. Inchtain

    Bottom Repair of Water Fixed Roof Tank

    Hello, I would like to know if it is allowed/recommended to leave the weld build-up of limited pits of the Tank Bottoms or they shall be ground smooth? Which is better? and Is Visual and Dye Penetrant Examinations are enough for their inspection? Thanks
  5. Inchtain

    Seat Rings of small and big size ball valves

    Hello, I wonder if it is a common practice or a recommended way to weld the seat rings and pull them to remove the ball from top-entry ball valves?! Is there any better alternatives? Thanks
  6. Inchtain

    Corroded Bottom Floor Plates Replacement

    I am seeking your help in comparison between choosing the single bottom with geomembrane liner and CP protection; and the double steel bottom with leak detection and CP protection for the replacement of a Crude Oil Surge Tank floor replacement with reference to the International Standards...
  7. Inchtain

    Failure during Hydro Testing of 36" Ball Valve

    Valve Data: Borsig Ball Valve 36" ANSI 600 RJ Type: Trunnion mounted/Top Entry Process Fluid: Gas Operating Pressure: 490 psi Max. Allowable Working Pressure: 830 psi Max. Allowable Working Temperature: 110 Degrees Celsius Ball & Seat Rings Material: F316 Year Built: 1977 Test Pressure: 2175...
  8. Inchtain

    PED or ASME Stamp

    We are purchasing a new condenser (Heat Exchanger) for a LNG Plant. We wonder if we request an ASME or PED Stamp from the manufacturer? and what is the main differences between those 2 stamps, apart from ASME for America and PED for Europe The Heat Exchanger Data: Fluid: Shell: Hydrocarbon...
  9. Inchtain

    Industrial Pump Incident

    Hello, We have two vertical pump installed (one is stand-by) at an API Separator to transfer the recovered crude oil back to the production separators, where the suction section is submersed in the oil. Few days ago, when the operator was ordered to switch off the working pump and start up the...
  10. Inchtain

    Underground Oil & Water Pipelines

    Hello all, Recently, we repaired a rupture in a water pipeline by replacing a pipe spool. Surprisingly, and after about 6 months we experienced a leak in the same trunkline and in the same replaced new portion. Could anyone elaborate more on how new welded pipes corrode faster than the older...
  11. Inchtain

    Treating Sulphate Reducing Bacteria

    Hello, We have tried injecting small dosages of Chlorine into a Treated Water Tank at an NGL Plant, in addition to the injection of the Biocide. The results were marvelous and the bacteria was dramatically decreased. However, I wonder if there is cons and pros for continuing injecting the...
  12. Inchtain

    Fiberglass Storage Tanks

    Dear Gents, Could you possibly inform me whether in-service horizontal foam concentrate fiberglass storage tanks (2000liters) are subjected to periodic inspections? and whether they are considered pressure vessels and required to be certified by a third party? I wonder what checks can be done...
  13. Inchtain

    Safety Valves for Pressure Vessels and Heat Exchangers

    Dear Gents, We are going to perform a general turnaround for an NGL Plant. I would like to know if it is mandatory by code/standard to dismantle the safety valves pertaining to the equipment planned for inspection during the period of the shutdown for inspection and setting verification. As...
  14. Inchtain

    Pressure Testing of Valves 2

    Dear gents, Would you confirm whether pressure testing of valves (ball, gate, glob, etc.) require a third-party presence, review or approval according to the international applicable standards and codes. Thanks,
  15. Inchtain

    Pressure Testing of Valves

    Good morning, Can anyone give me clear steps for the following valve tests? Low-pressure closure test backseat test Double block and bleed high-pressure closure test I would appreciate it if you have videos explaining the procedures. Additionally, is it a good practice to test gate valves...
  16. Inchtain

    Double-Bottom Crude Oil Storage Tanks

    Hi, Out of my curiosity, does API recommend or require the use of double bottoms for a leaking Crude Oil Storage Tank (Tank in-service), when the whole corroded bottom replacement is foreseen? In my opinion, it will be more economical to replace the Tank floor with the addition of geomembrane...
  17. Inchtain

    Could you possibly inform me about

    Could you possibly inform me about using Ceramic Fiber Blanket 1" THK in two layers instead of Ceramic Fiber Boards 11/2" THK for a partial replacement of the internal lining of a furnace (MWP: 1000 psi, MWT: 194 Fahrenheit, Burner using Fuel Gas) due to unavailability of insulation boards in...
  18. Inchtain

    Instrument Calibration

    Hello, With regards to the calibration of the UT thickness Gauges, Coating Gauges, Pressure Gauges, etc. I have two queries: - Is calibration needed every year? and which Standard states this interval? - When reading a calibration certificate for a device or a temperature or pressure gauge...
  19. Inchtain

    Heat Exchanger Tubes

    Dear Colleagues, We have a Condenser that experienced a rapid failure of its tubes. If the cooling water treatment was improved, do we still need to think about altering the material used. Saying that, I wonder if SA 334 Gr. 1 carbon steel material was a good choice for this Condenser tubes...
  20. Inchtain

    Testing a Vacuum Breather Valve

    Dear colleagues, We have a Vaccum Breather Valve whose setting is -10 mbar and installed at a fuel gas blanketed Water Backwash Clarifier (The design pressure of the Vessel is 20 mbar and the current vessel operating pressure is 5 mbar; while the diameter of the vessel is 3600 mm and the height...

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