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  1. stressone

    Need for Post Weld Heat Treatment

    On a 18" flare line we have installed a 16" nozzle using a split Tee. The WT of the pipe is 3/8", WT of the Tee is 30 mm. This tee is welded to the run pipe with two circumferential welds. Acc. to B31.3 a PWHT is necessary. Is it allowed to machine the Tee and the welds in order to reduce...
  2. stressone

    Tangential nozzle

    I am trying to determine wether a tangential nozzle (with external loadings) on a pressure vessel needs a reinforcing pad. Does ASME address this issue?
  3. stressone

    Operating or design conditions for nozzle loads

    To the best of my knowledge, API 610 does not specify whether the loads obtained from operating or design conditions should be used when comparing nozzle loads to the allowables. Is it up to the discretion of the client or are there fixed rules?
  4. stressone

    Large diameter reducers

    How would I go about building a CII-model of a cone/reducer that on one side is 28" and on the other 16"? WT = 6 mm. Perpendicular to the centerline of this reducer is a nozzle of 28" diam. Is modelling a pipe of average diameter (22") with a rigid element (represented by...
  5. stressone

    Chartered Engineers

    Thank you all for your swift replies. I appreciate it.
  6. stressone

    Chartered Engineers

    In many adverts in UK newspapers the term 'Chartered Engineer'is used. What is a chartered engineer? The reason I am asking is because normally in Europe, according to law, there is 'free transportation of people and goods'. In reality the acceptance of foreign degrees/diplomas causes...
  7. stressone

    DIN pipe size table?

    Have a look at EN ISO 1127 Title STAINLESS STEEL TUBES - DIMENSIONS, TOLERANCES AND CONVENTIONAL MASSES PER UNIT LENGTH EN 10220 Title SEAMLESS AND WELDED STEEL TUBES - DIMENSIONS AND MASSES PER UNIT LENGTH
  8. stressone

    buckling of elbows

    When a straight pipe is subjected to external presure, there is no way of telling which side will give first (Top, bottom, left or rigth, ...). But what about elbows? Being that they aren't 100% symmetrical, is one side more succeptible to buckling than the other?
  9. stressone

    45 degree bevel of tail pipe

    What are the advantages and/or disadvantages in applying a 45 degree bevel at the end of the tail pipe of a safety valve? I am thinking about forces, noise,...
  10. stressone

    Supports on elbow in horizontal pos'n

    Unless I have misinterpreted your question, the answer to your question can be found in the Caesar II Application Guide - Chapter 3 - Restraints. Vertical dummy legs on bends and horizontal dummy legs on bends.
  11. stressone

    Straddle bolt holes

    When flanges are being installed, the bolt holes need to straddle the center lines. Why?
  12. stressone

    friction factor used for shoe slides

    There is no specific code or standard that specifies these values. The determination of the friction coeff. is based on tests. Normally we use this value (0,3), present it to the client and ask for his approval. As for literature : a (Dutch) book "Staalconstructies" (Steel...
  13. stressone

    friction factor used for shoe slides

    Sir, in our engineering company (Europe based)following friction coefficients are used : - steel to steel : 0.3 - PTFE to steel : 0.1 - lubricated PTFE to steel : 0.05 These values have been aproved by several government agencies that are in charge of approving design and calculations...

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