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  1. abba7114

    Piping isometric drawings (Urgent)

    pacha2003 Isometrics are are generally not drawn to scale, but dimentioned adequatly to extract necessary information for shop drawing or construction. All fittings are shown schematically and dimentioned. Use can use autocad easily if you have. I must add that you need good understanding of...
  2. abba7114

    Weldolet Branch vs Header Schedule

    Can some one tell why sockolets and thredolets are described with #ratings while olets are rated in schedules. Thanks in anticipation of your answer
  3. abba7114

    Stainless steel pipes with carbon steel flange and valves

    I came across some 4" stainless steel pipes with carbon steel flanges and valves(butterfly), I first thought it was a mistake but further cheking revealed that all the flanges and valves are carbon steel as listed on the isometric. But the piping material spec. sheet quite ok has s/s flanges...
  4. abba7114

    Relation of Hoop and Compressive (Tensile) Stress

    sotree , If I uderstand you well, you are asking of axial tensile strength and hoop(circumferential) stress in a cylendrical vessel under internal pressure, If it is so, a simple relationshinp exist- hoop stress = 2*axial stress (tensile) You can find derivation in mechanics book
  5. abba7114

    Raised Face Flange nd Flate fFace Valve

    Montemayor, Sorry for not giving it much thought, I have never encountred such a problem practically, I was only considering the low pressure service. Thanks for pointing it out, I will quickly add that you are too hash in your response. Abba
  6. abba7114

    Raised Face Flange nd Flate fFace Valve

    Piping designer, Please clarify, If macnining of the raiced face will enable him bolt FF to RF what is wrong with using a spacer same material as the RF flange as he suggested? I feel if the sapacer can be machined to fit well it is ok. If this violates any pining code please let us know. Thanks...
  7. abba7114

    Design work Vs Stress analysis

    It is of great importance for the designer engineer to have a good understanding of stress analisys. Most experienced design engineers take stress into cosideration especially in pipind design, providing enough expansion loops, supporting adequately, etc so that design does not come back with...
  8. abba7114

    Graduating soon but with poor GPA...

    Reading the above responses strengthen my opinion that examination is not always the best way of testing ones capability to perform. Most people even with poor GPA in school they excell in their carrears,There are many instances where people with lower grades performing much better in job...
  9. abba7114

    stress analysis

    What is the size of the compressor discharge piping and the the branch connection? How far is the tie-in-point from the discharge nozzle and the length of the new pipe? The vibration problem of compressor discharge must have been taken care of during the compressor piping design to protect the...
  10. abba7114

    Cu-Ni C7O600

    Can some one help with a web site for informations on the subject material. We are currently constructing deluge system for fire water lines, the piping material specification I have has limited information, I need general table for pipe OD,thicness,weight per meter etc. Sorry for digressing...
  11. abba7114

    Stress Relief Vs. PWHT

    What an interesting posting, I think what is missing is to differentiate between heat treatment and stress relieving. Heat treatment is a term applied to metalls for several purposes including stress relieving after machining, other popurses are tempering to remove brittleness and even quenching...
  12. abba7114

    flow in a pipe

    We usually consider the feed line size to determine tank overflow size eg. if the supply line is 6" we choose 8" for overflow. Simply becouse becouse an 8" line can can accomodate any supply at any rate from a 6" line. Thanks
  13. abba7114

    HELP-PIPE SHOP SPOOL DRAWINGS

    pennpiper , Thanks for this wonderful posting, I will let you know how I am coping, infact must of the lines are CU-NI and 316L SS with some carbon steel. Thanks once again. abba7114
  14. abba7114

    HELP-PIPE SHOP SPOOL DRAWINGS

    Hi, I have been a piping design engineer suddenly I found my self in construction, a contractor is is constructing some facilities we have designed, I issued them GA'S and isometrics anl all relevant documents. I am to check their shop spool drawings, what will I look out for? I want someone to...
  15. abba7114

    How can I calculated loads on support on a pipe rack

    Here is a more simpler way, I suppose you already know your support locations on the pipe rack, all you need to do to know the support weight is to check pipe weight chart (filled with water)coresponding to the line size, devide distance betwwen two supports in to two and multiply it by the...
  16. abba7114

    equipment and piping for pp or pe plant

    Please define pp and pe
  17. abba7114

    PIPING DESIGN FOR PUMPS IN PARALLEL

    StressGuy, My understanding of the 5D of straight run upstream of the suction nozzle is avoiding turn or throthling.The reducer should be right on the nozzle so that the minimum 5D should be down stream the eccentric reducer. On the issue of reducer orientation some of the postings above did...
  18. abba7114

    Weld Length and Pitch

    Does the wall thickness of the base metal matter in this case
  19. abba7114

    PUMP SUCTION STRAINER ORIENTATION

    The strainer is a Y-typr, I am talking about side orientation 45 degree so that the clearance will be increased. thanks
  20. abba7114

    PUMP SUCTION STRAINER ORIENTATION

    I am currently designing a chemical transfer pump piping, the equipment location completed by others,the pump is end suction top discharge diaphram pump, when I modelled the strainer,bleed valve assembly I discovered taht it penetrates the grating, my question here is it possible to orientate...

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