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  1. bencpv

    fibreglass v steel pipe heat conductivity

    Hi all, I would love to have some assistance. At work we manufacture supply steel piping for district heating. Recently we have shown an interest in a pipe made from thermo setting resin with glass fibres. I have been asked to compare the thermal conductivity of the thermo set pipe with our...
  2. bencpv

    Creating spiral/helix of holes in a part (in Inventor)

    Can anyone help? i am trying to create sizing die for plastic extrusion. The die is basically an open cylinder with grooves (at a pitch/spacing of 6.35mm) running along the interior face. There are also holes in a six-start spiral pattern running along the length (to create a vacuum whilst...
  3. bencpv

    insulated pipe heat loss

    Thank you IRstuff, As the pipe work which our company supplies does (99% of the time) involve 2 pipes (flow and return), I shall use the equation shown in the first example of the PDF to obtain a figure for approximate heat loss. I'll adjust the coefficients for different materials etc...
  4. bencpv

    insulated pipe heat loss

    ok, thanks for explanation. In you opinion IRstuff, in theory I could take the method on the PDF (first example), plug in the appropriate values and and up with an approximate value for the heat loss? i.e. do the equation(s) look ok and does it match your MathCAD program? I would like your...
  5. bencpv

    insulated pipe heat loss

    thanks IRstuff, note that in the first example, the Rex term is less than 1% of the insulation resistance??????
  6. bencpv

    insulated pipe heat loss

    sorry for not being in touch sooner. once again I'd like to express my gratitude for everyone's work. I've just been mailed an example calc which is used by our suppliers of steel pipe. When I work through the first example (p.1-3 which uses PUR insulation, PEX carrier and PE casing) I get the...
  7. bencpv

    insulated pipe heat loss

    i have just run he calculation again and am now faced with another result! I now get 6.080 W/m :( I have broken down the calculation spreadsheet and attach it. I hope it easy to follow. Can you see where i've gone wrong? Please tell me what you meant by: 'Unclear whether your temperatures were...
  8. bencpv

    insulated pipe heat loss

    Thank you once again, Well, I'm embarrassed to say that I'm even more confused now! I don't think I should have used the imperial units, BTU etc to start with. Having been taught everything in metric, the imperial world baffles me! I find myself spending 'company' time in trying to get to...
  9. bencpv

    insulated pipe heat loss

    Thank you so much for the prompt assistance! From reading the replies I think that I wasn't converting from Btu inch/(h ft^2 °F) to Btu/(h ft °F - to be honest that thought never occurred to me! I was merely plugging in the numbers to the formula! Can anybody tell me the conversion? In...
  10. bencpv

    insulated pipe heat loss

    hi, I wonder if anyone can help me..... I have been tasked to find out the heat loss of buried insulated pipework. I have spent ages looking online for help in this and managed to find an equation (attached) that takes into consideration the service pipe, insulation, and jacket pipe. In my...

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