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  1. 4Pipes

    Superheater relief capacity PG-68.2

    I apologise in advance for not spotting earlier posts on superheater safety valve (PSV) capacity. If a SHO PSV had a capacity of 100% MCR, then the steam temperature through the PSV and SH tube temperatures would be the same as for design. PG-68.2 is interpreted in some places as meaning that...
  2. 4Pipes

    EN 12953 Shell boilers

    Please could somebody advise. How different is EN 12953 from its TRD predessor with regard to basic details such as wall thickness and nozzle reinforcement for a 230 psig boiler? I get very much more conservative results applying EN 12953 to an existing TRD design. ( >10% ) This surprises me...
  3. 4Pipes

    Algor layered mesh

    Does anybody have success mating layered mesh parts against say brick or plate parts? I have tried curved layered mesh against plate elements and simple dead flat layered mesh against brick parts. Neither give clean mating surfaces on layer 15. Should they? The layered parts I have tried...
  4. 4Pipes

    Table Display

    thread552-180218 Does anybody know if a satisfactory solution was found to the table display question in the above thread. i.e. Tabluar results will not display. Format > Results > Matrix works. Nothing happens when Automatic or Table is set. Each result has to be separately formatted...
  5. 4Pipes

    Multiple MC users on the the same pc

    I have had MC since 1.1. I only need very occasional support when MC does not work - rather than how to use. This has not been a problem until now. Please could somebody advise: a) Is possible for MC 14 to be configured such that MC can be used by other users of same PC? b) Can single user...
  6. 4Pipes

    Entry++ level commercial FEA application

    Hi all, Please could somebody recommend an entry++ level commercial FEA appliation. Which would you chose? I am looking for a general purpose FEA package, mainly at lower end static stress for general application and pressure parts plus as many other features I could get for a price. There...
  7. 4Pipes

    Acoustic Induced Vibration

    The Carruci & Mueller paper on acoustic induced vibration as shown in the CONCAWE, MTD, Exxon vibration guide etc gives an equation for the acoustic power generated by a gas pressure drop through a fitting. There is no indication of range of pressure drop for which the equation is valid. The...
  8. 4Pipes

    Eccentric Expanders in high velocity gas line.

    I understand that good practice to limit noise in high speed gas flow in a pipe would be to a) limit increases of diameter to no more than twice as each size change and b) use expansion of no greater than 15 deg. What happens to noise levels with a 2.5 - 3 times pipe increase with an...
  9. 4Pipes

    Sulfur pit steam coil

    Normally a lift fitting, or piping arrangement in-lieu, would be used to return condensate up from the coil in the bottom of a tank. Does the same apply to sulfur pits? I have no experience of sulfur pits but I would have expected that it does. Especially because pits tend to be deeper with...
  10. 4Pipes

    Pipe Branches

    A look around any old refinery will show that B31.3 pipe branches, with and without reinforcement, in Cl 150 and Cl 300 systems have been operating for years even in quite onerous conditions. Q1. The current practice among many large contractors is to specify fittings, reducing tees, weldolets...
  11. 4Pipes

    Which Rp for large diameter pipe ?

    Please could somebody advise on which Rp values to use for large diameter pipe. 1.25 for cast iron pipe and 3.5 for small bore copper and steel pipe which would seem logical given that Rp is a measure of energy dissipation due to plastic deformation. However, what happens when the supporting...
  12. 4Pipes

    Validity of Charpy tests on thick material

    Are 10 mm charpy tests as valid for thick material ? My understanding is that Charpy tests are an indirect measurement of fracture toughness. The tests are quick and cheap. If a 10 mm samples are taken from a 10 mm plate of low carbon steel and tested at progressively lower temperatures, a...
  13. 4Pipes

    Demise of Engineering Design

    Much has been said about outsourcing of design effort to both on shore and off-shore. While the money men are not totally innocent, they are only getting more than their fair shair of influence by default. The 2 real reasons for the slide in engineering are a) Engineers allowing technical...

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