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Aye, we have the same problem offshore on longer lines, over sand banks, up risers or from offshore to the beach. Got a job in the Med next year where the lowest points are at 1600-1700m, platforms at 80m depth and then onshore. Going to be interesting Pipeline Services Engineer in the Oil &...

Okay, thanks for your help. Appreciate it. Pipeline Services Engineer in the Oil & Gas Sector

Thanks for the response. We always use scfm for any gas flow, I had assumed that was just standard convention as it is rare we see anything else, so the SoW can be quoted regardless of back pressures calculated in detailed engineering. Regarding the units, procedurally we generally use gauge...

Okay. For the sake of argument, let's say the following: Pipelay = Horizontal (for simplicity) Location = Subsea Pipeline on Seabed at Depth = 105.5 m Pipeline Length = 23,184.3 m Pipe ID = 196.9 Pipeline Free Volume = 705.953 m3 (24,927.2 scf) Pipeline Fill Volume (N2 at 23.3 barG) =...

Hello, I am putting together a calcs spreadsheet for general pipeline services operations and have run across a problem. In the case of bulk dewatering, i.e. pigging the water out of the line with nitrogen, I need to calculate the back pressures of the MEG/MeOH slugs and also the water infront...

Look's like I'll have to stop being and lazy and finding a work around and get coding then. Thanks alot. Pipeline Services Engineer in the Oil & Gas Sector

Hello, I am currently making a calculations spreadsheet for pipeline services and am thinking of how best to calculate gas flowrates. Liquid is simply the Darcy-Weisbach equation with Churchill (Darcy) Friction Factors. However when it comes to gas, for example the dewatering of a liquid-use...

On a related note, does anyone know how the Darby 3K method is for gas flow? Pipeline Services Engineer in the Oil & Gas Sector

Not currently, but just trying to be proactive. It's a mammoth spreadsheet as it is, just trying to cover all eventualities. Take your point about the number of Flowmeters, that'll explain why I haven't had any success. Will just get the values for the ones we currently use and add them in...

I am making a calculations spreadsheet and want to include a means of estimating if for whatever reason the manufacturers values are not available at the time (vessel wifi is notoriously bad). Pipeline Services Engineer in the Oil & Gas Sector

Good evening, Does anyone have any information on the Darby 3K method for the pressure drop due to valves and fittings pertaining to flowmeters of various types. Been unable to obtain K factors for these with this method. Any help appreciated. Best Regards, Stuart

Perfect. thanks alot.

Result. Have now got it to determine if FDTF or Laminar. Couldn't get transitional so am counting transitional as everything not Laminar or FDTF. For anyone interested, code below: Re = cell C34 2Re = cell C53 f - original - cell C57 f - 2Re = cell C56 Churchill A...

Having a think just now and as the complete turbulence region f is independent of Re, I'll try doubling the Re and if the resulting f is closely approximate to the original value of f, then the flow is completely turbulent. Will give it a go and let you know how I get on. EDIT: Rounding to 3...

Thanks for that. That's how I have currently got it, as in the above image. the curve is produced using the Churchill correlation (as per the radigan link) and then the Re is plotted as a vertical line at the appropriate location. However, without looking back at the diagram each time. Do you...

Good Evening, I am currently creating a new calculation spreadsheet, part of this is a back pressure calculator which shows the type of flow using the churchill friction factor, this is shown graphically on a moody diagram as per the below image. However, I have multiple pipeline sections with...