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  1. GregLamberson

    Welding - NACE

    Deepray, Agree with PAN, you'll need to look at the as-builts and data books, pipe dia & wt, and do the calcs. A hydrotest would be in order plus an intelligent pig run to identify corrosion at a minimum. Valve suitable is another. You mention offshore, I would be very hesitant to use an...
  2. GregLamberson

    Subsea Pipeline Free Span Survey (As Laid & As Built Surveys)

    SDRME I see no one has respond3ed, I'll throw out a few comments. The as-laid survey as you mention is to determine the actual position of the pipeline as it is laid and compare it to the design basis calcs/criteria. Any issues as far as spans & stresses, damage, unusual in-place conditions...
  3. GregLamberson

    two pipeline in the same trench

    Rainbowseahorse Anchor blocks are not recommended as they tend to impart more stress into pipeline, which requires larger anchor blocks and you go round & round. Basically in a buried pipeline the soil acts as a continuous anchor, the only issues you have are where you come above ground at a...
  4. GregLamberson

    two pipeline in the same trench

    Rainbowseahorse: I would definately stay away from the anchor blocks. As far as the spacing, welder access is not really a consideration in bundling; those sections are welded up separatly at the push site and then "bundled" as they are pushed thru the swamp. Greg Lamberson, BS, MBA...
  5. GregLamberson

    two pipeline in the same trench

    robb4 Agree with BigInch. I am currently working on a project where we are bundling 3 ea high pressure gas pipelines (18", 22", and 24") and pulling them offshore through a cofferdam in a single trench. Greg Lamberson, BS, MBA Consultant - Upstream Energy Website: www.oil-gas-consulting.com
  6. GregLamberson

    PLEM PLET protection against trawling

    heyjaehey Had to run earlier, but wantesd to throw in a few other thoughts. There are basically two means of protecting subsea systems, be it pipelines/flowlines or equipment. These are, 1) reduce the marine activities in the area, or 2) engineer out or mitigate the risk by design. Ideally...
  7. GregLamberson

    PLEM PLET protection against trawling

    heyjaehey In addition to trawling damage, you may also want to consider protection against dropped objects from vessels. I believe API RP 14C gives some guidance on safety systesm, including trawling damage. Also, try API 1111. Depending on your location, you can check 30 CFR 250, 49 CFR...
  8. GregLamberson

    Pipeline welding

    It should have been specified in the PO to be ground flush. As you mentioned, it will cause problems with your automatic welding as well as your AUT. I had that problem once before in Russia and we did grind the external seam. Check with the welding & AUT equipment manufacturers for the...
  9. GregLamberson

    4 Leg vs 8 Leg

    JLSeagull Don't have the weight of the topsides yet, but it on the small side - it will have 15 well slots and it's a 1,000 bpd production with 30 GOR and 1,000 bwpd, so it will have some gas processing & water handling. I was asked what the technical justification would be for one over the...
  10. GregLamberson

    4 Leg vs 8 Leg

    All: Is there any technical justification to go with an 8 Leg vs a 4 Leg rig support/production platform if the topsides are the same? This would be in 250' of water. Greg Lamberson, BS, MBA Consultant - Upstream Energy Website: www.oil-gas-consulting.com
  11. GregLamberson

    Spool?

    cavatina For risers, again, it depends. If the riser is stalked on there is no spool. Otherwise, you have some options, maybe a sub-sea flange or a spool that is hyperbarically welded. In any case it is a piece of pipe, with or without any appurtenances, that is used to complete a piping...
  12. GregLamberson

    Spool?

    rconnor is correct - it depends. A spool piece is a section of pipe that is put in temporarily for some reason or another. Maybe you need to pull out a valve and want to drop in a spool piece until you get another one or get it repaired, many reasons for spool pieces. Pipe spools on the...
  13. GregLamberson

    Steel for Offshore Applications - References

    JohnOD This should be posted as a new thread, some members take "thread hijacking" seriously. Greg Lamberson, BS, MBA Consultant - Upstream Energy Website: www.oil-gas-consulting.com
  14. GregLamberson

    PERMEABILITY OF PIPELINE COATINGS TO CO2

    rodneybennet Actually I don't need to know, however, IMV (the original poster) does have need of this information for one reason or another. Greg Lamberson, BS, MBA Consultant - Upstream Energy Website: www.oil-gas-consulting.com
  15. GregLamberson

    shallow water pipelay barges

    Jihed What you may want to look at, and I don't know how close the shallow water is to the shore (where the tie-in is) or how long the pipeline is, is weld it up on shore and pull it out. In fact we are doing that now in offshore Nigeria, we have very shallow water (unable to access it with a...
  16. GregLamberson

    shallow water pipelay barges

    Jihed What you may want to look at, and I don't know how close the shallow water is to the shore or how long the pipeline is, is weld it up on shore and pull it out. In fact we are doing that now in offshore Nigeria, we have very shallow water (unable to access it with a laybarge) out 5 kms...
  17. GregLamberson

    shallow water pipelay barges

    I would think tugs would be a problem handling anchors in shallow water, may need to use a modified jack-up, like a SEWOP or similar and rig it up to lay pipe. It depends on what size pipe and how long it is, but it's fairly easy to rig up stations for laying pipe in shallow water, be pretty...
  18. GregLamberson

    Pigging of internally-lined pipeline

    I'll echo SJones, trying to coat field joints internally is a nightmare. There are companies that do it and it's been done, but not successfully as far as I know. Greg Lamberson, BS, MBA Consultant - Upstream Energy Website: www.oil-gas-consulting.com
  19. GregLamberson

    PERMEABILITY OF PIPELINE COATINGS TO CO2

    IMV Assume you are talking of internal pipe coatings - have you tried any of the coating manufacturers or coating application companies? Greg Lamberson, BS, MBA Consultant - Upstream Energy Website: www.oil-gas-consulting.com
  20. GregLamberson

    Off-shore/On shore pipeline costs for economic modelling

    rex113a I have a conceptual cost estimating model I'd be happy to dump the informaiuton in and see what spits out, but it apply's area factors, so I will need the geographical region as well as the key details - pipe length & sizes (dia & WT), type of coating (and if CWC is required, any...

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