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  • Users: Dario2002
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  1. Dario2002

    Pipe support during excavation of gasline

    Searching this forum shows quite many threads regarding pipe support. Most threads with specific answers are quite old (year <2005), and some general info is that there is no fixed rule or standard for pipe support distance. Has this changed in last few years? Is there now any...
  2. Dario2002

    Magnetization and demagnetization

    I see that many posts regarding demagnetization topic is present in this forum. Let's try to be more practical. Let's say we have 20" pipe, and we measure 35 gauss on pipe end. Heat treatment is probably not suitable for demagnetization. Next option is demagnetization using welding cables. How...
  3. Dario2002

    In service welding

    What are practical experiences with in service welding on high pressure gas pipeline (pressure containing metal sleeve)? Assuming that welding procedure is verified, preheat is controlled (up to 100°C), surrounding temperature is quite low (around -5°C), natural gas is flowing through 20" pipe...
  4. Dario2002

    Refurbish ball valve for natural gas

    What are practical experiences with refurbishing welded body ball valves for natural gas? We have some stock of leaking ball valves (PTFE seal, 12", 18", 20", Cooper Cameron, Argus, etc.). Experience with many of new valves (which often comes from China) are worse than 30 years old C.C. or...
  5. Dario2002

    Lamination in pipeline material

    As result of inline inspection, some of the anomalies are calsified as "possible lamination", and recomendation is to uncover pipeline and inspect anomaly. After that if it is really lamination which is not parallel to pipe surface, repair should be done. Question is, HOW TO INSPECT LAMINATION...
  6. Dario2002

    COMPOSITE WRAP's for pipeline repair

    What is Your expirience with composite wrap for onshore underground gas pipeline repairs? Until now we have used Clock Spring, some times WrapMaster (PermaWrap). I think this is fiber glass wrap's. Now we have some "Black Diamond" (Res-Q) which is carbon wrap, much more flexibile around...
  7. Dario2002

    Pipeline monitoring for burst

    Is there any good site, magazine, book, powerpoint .. anything .. about pipeline burst monitoring (natural gas transmission) using pressure drop over time? We are using pneumatic devices which close pipeline when pressure drop is too high (change to electronic device is stared). I need to...
  8. Dario2002

    Tool for measure dents

    Is there any good tool for measuring DENTS on pipe (10"-28") at pipeline. Tool should be simple and portable. One point measuring is ok (like gauge), but recording profile of dent is also desirable (one axis or two)..
  9. Dario2002

    Gas Compressor

    We need to buy compressor for natural gas. It must be an a explosion-proof edition, and it must be transportable by road. It will used to pump gas from one section of pipeline into next. Gas lines are in sizes 12", 20", 24" and 28". A length of sections is up to 15 km. Working pressures are up...
  10. Dario2002

    Pipe burst and transient analisis

    I lost 2 days searching for this on google, etc. I need method, or better yet software for transient flow analisis for following problem; Gasline with nautral gas (f.e. lenght 10 km, diameter 500 mm, pressure 30 bar). Gasline is broken is some point and loosing known flow (depending of hole...
  11. Dario2002

    Gas line - section valves with safty function

    We have some section valves on 20" gas line. Distance is cca 10km. Valves are equiped with actuators which are trigered by preassure drop in gas line. Not all of them have same setting (sensitivity adjusted). Is there any rule, or calculation for: WHICH PRESSURE GRADIENT MUST HAPPEN TO ACTIVATE...
  12. Dario2002

    Pressure drop at pipe damage

    Is there any resource how to estimate preasure drop when gas line gets some damage (hole, pinhole, gilotine, large hole) ? Ex. Pipe line with natural gas at 30 bar. Length cca 10 km. Which hole size is neccesery to have preassure drop of 1 bar/min. Or vice versa: for some hole (type) how much...

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