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  1. Chembloke99

    Friction coefficient between Polypropylene and Concrete Mattress

    All, I am currently working on the subsea pipeline crossing design. We have 18-inch pipeline crossing over the 6-inch pipeline. Can anyone please provide friction coeffiecient at the interface between polypropylene coated pipeline and concrete mattress used as the support. The pipeline is...
  2. Chembloke99

    Choice Between Higher Steel Grade and Higher Wall Thickness

    @ SNORGY Thanks SNORGY for your help. Those reference are of nice help. @ BigInch Thanks for your advice. I have understood your point.
  3. Chembloke99

    Choice Between Higher Steel Grade and Higher Wall Thickness

    @ Big Inch Sir, do you mean to say that, their is greater saving on higher grade steel from installation point of view? With due respect to you, from what I know, lower grade steel have lower installation cost due to the fact that it is difficult to weld higher grade steel and consequently lay...
  4. Chembloke99

    Choice Between Higher Steel Grade and Higher Wall Thickness

    Thank you all for your help. @ BigInch: Your advice is well taken. @S Jones: The Corrosion Allowance is taken as 3.2 mm. @Struct 71: The pipe weight is not an issue and the material is also avaiable.
  5. Chembloke99

    Choice Between Higher Steel Grade and Higher Wall Thickness

    Thanks a lot Zdas for your guidance. I can understand the things which are to be kept in mind while deciding on material grade selection and also your reasoning behind choosing lower grade steel . Many Thanks once again.
  6. Chembloke99

    Choice Between Higher Steel Grade and Higher Wall Thickness

    Thanks a lot Snorgy for your help. Yes, the pipe is indeed seamless. Can you please provide me some reference from any standard or recommended practice where I can obtain detail information on this topic and which I can quote while preparing the report.
  7. Chembloke99

    Choice Between Higher Steel Grade and Higher Wall Thickness

    Thank you Mike once again for your reply. Sending out an RFQ would be a time taking process and unfortunately, I have time contraint at the moment. With regards to product flowing through the pipeline, it is a multiphase fluid with C02 composition as 1%, Inlet P - 200 barg, Temperature - 70...
  8. Chembloke99

    Choice Between Higher Steel Grade and Higher Wall Thickness

    Thanks Mike for your reply. Honestly speaking, I don't think I have the essential skill and experience to design the whole system for different permutations and then evaluate the cost. Could you please tell me from a purely technical point of view which one is normally preferred in the...
  9. Chembloke99

    Choice Between Higher Steel Grade and Higher Wall Thickness

    Hello, I would like to know from both technical and commercial point of view if I have to make a choice for a subsea pipeline between Higher Steel Grade and Higher Wall Thickness, which one I should go for? For e.g. , for a 6" pipeline should I go for API 5L X- 52 Wall Thickness - 12.7 mm or...
  10. Chembloke99

    Change of Calendar format for different tasks

    Hi, I am new to MSP. I need help in creating Creating Different Calendar format for differnent tasks. For my project, I have many different tasks going on at the same time for which working hours and working days are different. For eg : 1.Engineering work- Days:Monday to Friday- Date: Start...
  11. Chembloke99

    Wall Thickness Design

    Thanks Amir for your reply and for your advice. In fact, I had followed what you had suggested. I took the help of few of my colleagues and found out how the values for combined loading criteria can be estimated. Many thanks once again.
  12. Chembloke99

    Alternative Arrangement for Choke Valve Failure

    I would like to know that in the event of failure of choke valve which type of valve or equipment is usually provided as an alternative at the wellhead structure so that excess pressure does not develop into the pipeline( the one which connects the Wellhead to the Production Platforms)? This is...
  13. Chembloke99

    Cost Analysis for Shallow Water Jack Up Production Unit

    Can anyone please provide me information about making the cost estimate for shallow water jack up production unit for treatment of sweet wet natural gas? The process package will be modular and it will be set up after the drilling operation is performed by the drilling package. Many Thanks.
  14. Chembloke99

    shallow water jack up process production unit

    Thanks JLSeagull for your reply. I am sorry, I didnt follow you properly. "Among the differences is that you make all of your own power, water, etc." Does it mean that these system are usually not provided for shallow water jack up?? In the field operation manual, the following operations were...
  15. Chembloke99

    shallow water jack up process production unit

    In a shallow water jack up, I need to provide an overview of design of process operations. The shallow water jack up will first perform the drilling operations and thereafter remain on location as the production unit. The content is 97% wet methane with no contaminants expected. I referred...
  16. Chembloke99

    Steel Pipe Maximum Bending Moment

    Thanks Patswfc and Ussuri for your help. I have implemented the method that you have advised !!!
  17. Chembloke99

    Steel Pipe Maximum Bending Moment

    Ya..I understand your point..but actually I am doing wall thickness calculation based on DNV-OS-F-101 ..In the spreadsheet, for load interaction, I need to put the value of ME (Maximum Bending Moment due to Environmental load)..I know I can get the exact value once I do Dynamic Pipeline...
  18. Chembloke99

    Steel Pipe Maximum Bending Moment

    Thanks Ussuri once again..Well I can understand lot of things are needed to be considered for accurate calculation. But I have read in a technical document, that for initial calculation Max Bending Moment can be estimated as 0.85 times SMYS. So my question is how can i get Bending Moment if I...
  19. Chembloke99

    Steel Pipe Maximum Bending Moment

    Thanks for the reply. I am not too sure exactly about the conditions. It is a 6” subsea pipeline between Well Head Platform and Production Platform with risers installed at both ends. I would like to know bending moment for subsea pipeline as well as the riser. I don’t know in which category...
  20. Chembloke99

    Steel Pipe Maximum Bending Moment

    I am sorry for asking such a fundamental question. I have forgotten Strength of Material Basics that I studied in 1st Yr. I just want to know what is the formula for maximum bending moment for a steel pipe? Many Thanks.

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