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  • Users: gatossi
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  1. gatossi

    EN10253-2 Caps Type A with no Pressure Factors

    Type A fittings are defined as "having the same thickness in the body as in the welded end" and in most cases have a lower pressure containing ability than the pipe of the same thickness. So far I have not had any issue while selecting Elbows, Reducers and Tees (EN10253-2 clearly shows the...
  2. gatossi

    PFA Liner detached from flange surface

    For one of our projects, we have a PFA Lined piece of equipment. On inspection, we found out that the liner is detached from the face of the flange (about 2-3 mm). The supplier claims that this is normal practice and the gap will close once the piece is bolted to the pipe. I am sure that will be...
  3. gatossi

    Category M equivalent in EN 13480

    We are designing a process plant under EN 13480, one of the fluid is Hydrogen Cyanide and our HSE team has deemed it as a "Category M fluid". As far as I am aware, Category M is not defined as such under EN 13480 (or PED). Am I missing anything in EN13480 that lays down rules for designing a...
  4. gatossi

    Through wall tensile testing

    Hi all, I need to specify tensile test that shows how the mechanical properties vary across the wall thickness of the pipe (X60 pipe, heavy wall... over 45mm) API 5L reads something on the lines of "tensile test probes shall be representative of the wall thickness of the pipe", but our design...
  5. gatossi

    Non-monogramed API 5L Pipe

    Hi all, Our client in the middle east has specified an 14" API 5L X60 with a wall thickness of 55 mm (minimum), i.e nominal around 60mm In accordance with Table 9 on API 5L 45th Ed our pipe doesn't fall under the "Permissible specified outside diameter and specified wall thickness" therefore...
  6. gatossi

    Test Category TC1 or TC2

    Hi all, I'm specifying pipe to EN10216-2 and I find that there are two different categories for testing, namely TC1 and TC2. They mainly differ on the NDT for longitudinal imperfections. I couldn't find any reference on which one to select on EN13480-2 or -3. Can anyone bring some light on...
  7. gatossi

    Reducing Lapped Flanges

    Hi everybody, Our client wants to install a 18" line at the bottom of a tank which has a 24" nozzle. We have two options: 1) either we use a reducer (very expensive as it is made of zirconium) or, 2) we use a reducing lapped flange (18" stub end on zirconium sized to match the 24" face, flange...
  8. gatossi

    Buterrfly: Soft vs Hard seats

    I have a butterfly valve on LP Nitrogen and Instrument Air (9 barg @ 85ºC) with hard seats (SS 316L). What will stop me on changing it to Soft Seats (PTFE)?
  9. gatossi

    Steam Line valve selection

    Hello, I have a drip leg on a 300# - SS316L line where I have to select a couple of "block" valves (1" size) Previously the line was 2" and we had gate valves installed (Press 30barg, Temperature 300ºC, that's why we didn't use ball or plug valves) The vendors catalogues for SS gate valves go...
  10. gatossi

    Inverted bucket steam trap

    Good day! I'll need your help with steam traps. I've been asked by our process guys for a steam trap for which the line's design conditions are: Press: 30 kgs/cm2 Temp: 330 ºC But (always a but!) they recon the line won't see that much pressure constantly... on the contrary... it is going to be...
  11. gatossi

    Reduced vs Full Port Ball Valve Class 600

    Good day! I have a question in regards to ball valves. I just took over a project for a Process Plant and I'm checking the selection of valves. When I came to ball valves 600# our specification says to be "Reduced Bore" but our three vendors (all very well known and respected) had offered "Full...

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