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  • Users: suraiya
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  1. suraiya

    Minimum Umbilical J-Tube Diameter

    I'm a project engineer currently working on a project designing an SSIV (subsea isolation valve) system. The umbilical size is 4-inch, and the pulling head is about 6-inch but the pipeline/subsea consultant has proposed that the umbilical J-tube diameter to be 16". To me this seems to be an...
  2. suraiya

    I'm a subsea engineer with mechanic

    I'm a subsea engineer with mechanical background. Recently I was assigned to a project which require design of a subsea umbilical, which will comprise bundle of hydraulic and chemical tubes as well as power and signal cable. Being a mechanical guy, I really need some basic idea on the power...
  3. suraiya

    subsea ball valve vs gate valve

    Between ball valve and gate valve, which one will be a better valve for isolation on a subsea manifold header (from an oil well)?
  4. suraiya

    Pipeline Slug Mitigation

    I have a subsea gas well with reasonable amount of water content. Tieback distance to the host platform is about 5 miles, and it is an 8" pipeline. Initial calculations show that there'll be slugging. So my flow assurance engineer advises periodical pigging operation. My question is, is there...
  5. suraiya

    Subsea Launcher/ Bi-Directional Pigging

    Thanks DrillerNic. Another option that I'm considering is to have automated subsea launcher, where you slot in couple of pigs into the launcher (you need longer traps, and some sort of valves or barrier between each pig, of course,and release one at each desirable time, using timer, or remote...
  6. suraiya

    Subsea Launcher/ Bi-Directional Pigging

    BigInch, Apology for not being clear enough. It is a gas field with high condensate ratio, also with potentially corrosive fluid. Apart from slugging (which is not that bad actually), the client wanted some means to assess the pipeline integrity from time to time- e.g. wall thickness losses...
  7. suraiya

    Subsea Launcher/ Bi-Directional Pigging

    Really appreciate all the responses. Indeed, the keyword here is "marginal", i.e. how to deliver the most optimized two-well subsea project from life cycle cost point of view. Obviously when talking about life-cycle-cost, critirea such as operability, maintainability, reliability etc are...
  8. suraiya

    Subsea Launcher/ Bi-Directional Pigging

    I'm currently working on an oil and gas subsea project whereby the client plans to tie-back a two-well marginal field (to a common manifold, and then) to their host facility, which is some 8 miles away. As part of the given operating philosophy, they'd like to have the pipeline piggable. The...
  9. suraiya

    drilling rig type for subsea well

    I'm a facilities engineer who has just started to venture into subsea production system. My question, is it technically possible to drill shallow water subsea well (say around 300ft water depth) from a jack-up rig or a tender-assist barge? If not, why? I'm just curious because in this part...
  10. suraiya

    Why pig traps have 2 barrels?

    In most pig trap design that I've encountered, there a 2 pig trap barrels, a major barrel and a minor barrel, connected with a reducer. Why do we need two barrels? Can't it be just long single size barrel?
  11. suraiya

    Determining adequate bolt length

    Is there any rules/codes or formula to determine minimum length of bolts for flange, both RF and RTJ? What are major parameters required to decide the length?
  12. suraiya

    CO2 vent snuffing system

    Hi, I'm working on a detail design for an ofshore platform vent snuffing system. The vent system, in the first place is not meant for continuous venting; it is thre only for upset cases. Max venting rate will be 40mmscf. And this platform is unmanned. The client is asking us to design a CO2...
  13. suraiya

    CO2 snuffing

    Hi all, Can someone help me on CO2 snuffing for offshore platform vent stack. I mean, does anyone know any guidelines or standards that could guide in calculations of number of CO2 bottles required for the snuffing operations.
  14. suraiya

    ASME B31.4 vs B31.8

    I know B31.4 is meant for liquid pipeline transportation, whereas B31.8 is for gas transmission. Apart from this distiction, I would really appreciate if someone can tell me what are the major differences between these codes.
  15. suraiya

    Pipeline Derating

    Is there any standard/best practices/rule of thumb exist on how to obtain a pipeline age derating factor? I'm currently working on an old (15 yrs) subsea 18" crude oil pipeline which need to be revived. I understand that the best way is to do physical inspections, which might include...
  16. suraiya

    gas turbine's exhaust internals material

    Which one between SS304, SS304L and SS409 is the better material for internal parts of gas driven turbo-generator exhaust. The application is for an offshore gas platform. As such, it shall suit a marine environment,ie. exposure to high humidity and saltwater/chloride environment.
  17. suraiya

    turbo-generator exhaust internal

    Which one between SS304, SS304L and SS409 is the better material for internal parts of turbo-generator exhaut. The application is for an offshore gas platform. As such, it shall suit a marine environment,ie. exposure to high humidity and saltwater/chloride environment.
  18. suraiya

    cladded pipe

    Hi, when people talks about caldded pipe, what does that mean? does that mean you add some other materials to the original pipe material to strengthen it? how does the cladding process take place- physically or via certain chemical processes?
  19. suraiya

    Hazen-Williams "C' factor

    Hi, Can anyone who is familiar with the Hazen-Williams equation for liquid line sizing tell me the most appropriate value of the "C" factor for duplex stainless steel piping materials? rgds, Suraiya
  20. suraiya

    direct welding of CS A333 to CS A106

    Thanx for all replies. I'm sorry that I don't make my case clear enough. In my case, the design temp range that we're looking at is -20C to 50C. However operation temp will be around 10C-15C. It is very unlikely that we'll go beyond this operational range.

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