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Recent content by briand2

  1. briand2

    HVAC Application Similar To Reboiler; Advice Appreciated

    Apologies for asking a non-chemical question here, but as my HVAC application is apparently very similar to a 'reboiler' (as far as I can tell!), I thought this is the best place to ask! I have a hot water storage cylinder heated by a 3kW electric immersion heater. Cold water supply is from an...
  2. briand2

    Fault Condition Back Pressure On Open Vent To Water Heater

    Apologies for the length of this post, but I'm really trying to find out if my understanding is correct concerning two-phase flow in this particular situation! In the UK, our typical open vented domestic hot water system in residential properties comprises the following: atmospheric tank in...
  3. briand2

    DUCTINGS LOSSES

    I'm sorry for stating the obvious, and I wouldn't wish to offend anyone, but, assuming your meter reads differential pressure rather than velocity, did you (correctly) work out the velocity at each measurement point and average the calculated velocities rather than (incorrectly) average the raw...
  4. briand2

    Copper Pipe Corrosion Under Phenolic Foam Insulation

    Chalky1, "What the betting they used phenolic foam?" Keep your money in your wallet, there's no such thing as a poor bookmaker! The particular London job to which you refer did not involve phenolic foam insulation. Regards, Brian
  5. briand2

    Transmission Line Field Acceptance / Performance Testing

    My experience extends only to 11kV within buildings, so apologies for what may be a trivial question... Once a new transmission line (say 400kV) has been constructed and commissioned, are any tests carried out to check its real performance / ampacity. (I'm aware of the type testing of the...
  6. briand2

    Looking For Book On HVAC Construction / Planning / Scheduling

    Can anyone here recommend a book on the subject of practically planning / scheduling of HVAC installation works, including such things as suggested / recommended sequence of materials installation, interfaces with other disciplines, etc? Thanks, Brian
  7. briand2

    Free pipe sizing programs CIBSE based

    Sorry, I never got round to posting any instructions with my spreadsheet! It's gone through some development over the last few years...I'll post the latest version shortly (it's been so long now, I more or less forgot I even had a website!). Brian
  8. briand2

    Impossible Flashover on 5KV System

    Have you considered that the system may have been suffering from resonance at one or more harmonic frequencies, thus creating voltages sufficiently high to damage capacitor banks, etc? Brian
  9. briand2

    Does PVC Sleeve Corrode Stainless Steel Tube

    stanweld, I guess the question is not so much "can such pitting corrosion occur in the presence of chlorides" as "what are the chances of such chloride concentrations occurring in the circumstances described". These circumstances comprise a semirigid (bendable) corrugated stainless steel pipe...
  10. briand2

    Does PVC Sleeve Corrode Stainless Steel Tube

    gr2vessels, Thank you for adding your experience / knowledge!! I was in any event going to question the manufacturer's statement regarding contact of his product with PVC tubing (as that's how the product has already been installed); I'll now feel much more comfortable doing so, and I suspect...
  11. briand2

    Does PVC Sleeve Corrode Stainless Steel Tube

    Whilst I realise that chlorides have a detrimental effect on stainless steels, I'm not convinced that the chlorides can somehow leach out of PVC tubes to attack adjacent stainless steel tubes. Also, PVC Coated Stainless Steel Wire Rope is available for yachting, although some people don't use...
  12. briand2

    Does PVC Sleeve Corrode Stainless Steel Tube

    A supplier of stainless steel tube states the following with regard to sleeves used to route that tube (the underline emphasis is mine): Sleeves shall be of a material capable of containing or distributing gas, e.g. copper, steel, polyethylene, or other suitable plastic material. Care should be...
  13. briand2

    Copper Tube (Chilled Water) Corrosion Under Phenolic Insulation

    Let my first apologise for cross posting; I previously posted this in the Piping & Fluid Mechanics Engineering forum, but I feel members of the Corrosion Engineering forum may well be able to provide more in-depth comments. I've seen various conflicting articles / reports / papers concerning...
  14. briand2

    How to find Change in Temperature for sheet metal

    desertfox, However I try the link, it works, so I don't know why it won't work for you; perhaps you can just copy paste it into your browser address bar? Anyway, I've tried providing it again on this post, this time using the "Step 3 Attachment" (which I've not used previously!). Regards...
  15. briand2

    How to find Change in Temperature for sheet metal

    The sol-air temperature may indeed by "fictitious", but it's nevertheless a reasonable estimate of maximum temperatue in the absence of a much more detailed analysis. In calculations it is is used as an assumed air temperature, so the assumed material surface temperature would be a bit lower...
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