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  1. djwright

    Testing Hydraulic Tubing

    I am involved in testing hydraulic tubing system (design pressure = 3000psi). I have tested two sections individually. I plan to join these two sections with JIC fittings. Can anyone advise if I may do a "service leak test" of the system with pressure provided by the hydraulic system (ie the...
  2. djwright

    V-cone Flow Meter for Wet Gas

    Thanks for these responses. We like the v-cone from a space-saving point of view but have concerns about the robustness of the v-cone configuration in slug flow conditions. We are now looking at the conditioning orifice meter (by Emerson). Regards, DJ Wright
  3. djwright

    V-cone Flow Meter for Wet Gas

    Has anyone out there got experience of using the McCrometer v-cone flow meter for metering wet gas at a wellhead? I have used venturis before but the v-cone flow meter has some apparent advantages (e.g. smaller required space envelope and lower cost). Regards, DJ Wright
  4. djwright

    Hydrate Formation at Pipe Bends

    Thanks for your thoughts. In my application, gas will be flowing round bends at > 10m/s. Intuitively, it seems to me that bends will not cause accumulation of hydrate crystals in such circumstances. For more details, see similar posts in Chemical Process Engineering. Regards, djwright
  5. djwright

    Hydrate formation in piping bends

    Thanks for your advice. My original post was I think slighly misleading. A reinterpretation of the expert's view is that turbulent flow regimes can promote hydrate growth. Typically, a production well has xmas tree, pipework with choke, NRV connected to a manifold by means of a tee. Our flow...
  6. djwright

    Hydrate formation in piping bends

    I am looking at wet natural gas piping system. An expert has advised that hydrate crystals have a tendency to accumulate at piping bends (radius < 3d). Intuitively, this does not seem right. Also I have been unable to find any references to the phenomenum on the internet. Has anyone got any...
  7. djwright

    Hydrate Formation at Pipe Bends

    I am looking at wet natural gas piping system. An expert has advised that hydrate crystals have a tendency to accumulate at piping bends (radius < 3d). Intuitively, this does not seem right. Also I have been unable to find any references to the phenomenum on the internet. Has anyone got any...
  8. djwright

    Pressure ncrease in vessel due to in-leakage

    I want to calculate increase in pressure in empty vessel (volume is approx. 2m3) due to gas (methane) flow into the vessel at a known rate (approx. 6 standard m3 per minute). Could a kind process engineer out there let me know how to do the calculation? Thanks. djwright
  9. djwright

    FCAW for site welding of structural steel

    Thanks for helpful posts. In our application we have used gas-sheilded process to weld 60ksi structural steel. Welding environment was offshore / windy but full protection and monitoring was provided. Some &quot;cracking&quot; was reported. Various theories have been put forward (lack of...
  10. djwright

    Use of 316L Stainless Steel in Marine Environment

    Thanks for the responses. I guess my original post wasn't very clear. I have some 316L tubing already in place. So far (1 year in service) it looks OK. I am currently planning to install more. I would prefer to use 316L if its fit for purpose and cheaper than the alternatives suggested...
  11. djwright

    Use of 316L Stainless Steel in Marine Environment

    I want to use 316L stainless steel hydraulic tubing on an offshore platform (field life approx. 10 years) offshore Ireland. I am advised that 316L will corrode and that I must therefore paint it. I don't want to paint because I believe it is not necessary in my application and for obvious cost...
  12. djwright

    FCAW for site welding of structural steel

    Is flux cored arc welding a good process for site welding of structural steel? Has there been any history of weld cracking associated with this process? Thoughts and experiences would be appreciated.
  13. djwright

    Alloy 625 Overlays on Carbon Steel - Cracking

    Thanks for this. Based on my investigations so far I believe that it is essential to ensure that overlay welding procedure provides hardness less than 22HRC / 248HV10 as per NACE MR-01-75. I have contacted ITAG to establish the cause of the problem on Liverpool Bay and await a response. djwright
  14. djwright

    Alloy 625 Overlays on Carbon Steel - Cracking

    I believe it was ITAG
  15. djwright

    Alloy 625 Overlays on Carbon Steel - Cracking

    Thanks for this. It was the reported BHP failure(s) which had me worried. The use of overlays is so common I assume that the BHP failure is specific to BHP rather than a generic problem. In our sour service application, we have qualified overlay procedures in accordance with ASME IX and NACE...
  16. djwright

    Alloy 625 Overlays on Carbon Steel - Cracking

    It is a fairly common practise to overlay carbon steel componenents with alloy 625. Valve seat pockets and flange ring grooves are two applications which I have encountered many times in the petrochemical industry. Recently, I heard about a crack like failure between overlay and carbon steel in...
  17. djwright

    UV Protection of Polypropylene Coating

    Thanks for this. You have pointed me in the right direction. Regards, DJ Wright
  18. djwright

    UV Protection of Polypropylene Coating

    We have some above ground steel pipework with polypropylene (PP) coating in a petro-chemical plant. Whilst the PP coating has proved to be a very robust for buried pipeline useage, we understand that it will degrade over time in sunlight. We believe we have 2 options: a) Strip PP off and use...
  19. djwright

    Crane Tests

    I have got an electro-hydraulic 15ton SWL crane fitted with something called automatic crane protection system. I want to test and use the crane in UK. Do I have to test the crane at 1.1 or 1.25 x SWL? Do I have to think about the structural and mechanical strength separately from hydraulic...
  20. djwright

    B31.3 Class M

    John, Thanks for this. It has been most helpful. Regards, Dave Wright

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