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  • Users: briand2
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  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

    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...
  4. 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
  5. 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...
  6. 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...
  7. briand2

    Copper Pipe Corrosion Under Phenolic Foam Insulation

    I've seen various conflicting articles / reports / papers concerning corrosion of the outer surface of copper pipes (particularly carrying chilled water) insulated with phenolic foam insulation. On the one hand, the viewpoint of the European Phenolic Foam Association (December 2000) is that...
  8. briand2

    Availability Of Low Level Perimeter Induction Units In UK

    Could anyone please advise me of the names of any manufacturers still supplying low level perimeter induction units in the UK? I'm trying to find a current / budget price for units to fit in a 1 metre wide gap, with primary air supply of about 26 litres/second (at 14 degC) and cooling output in...
  9. briand2

    Carbon Monoxide From Hot Cast Iron

    Can anyone please suggest what temperature cast iron needs to be heated to before the free carbon in it combines with oxygen in the air to start producing carbon monoxide? Thanks, Brian
  10. briand2

    Possible Electric Shock?

    I'm currently looking into an apparent electric shock incident. The bloke involved walked across a room and (reportedly) turned off three groups of lights, one at a time, via a three-gang metal faced switch. On operating the third switch, he saw a flash and felt a shock. At the time, he was...
  11. briand2

    Strength Of Copper Tube Compression Fitting

    Does anyone know where I can find realistic information on the strength of compression fittings for copper tube? I'm specifically referring to the type of fitting that is common in domestic water installations in the UK. It would appear that the mode of failure under pressure is that the...
  12. briand2

    IEEE "White Book" (Health Care Facilities); Load Estimation

    Hi, I work in the UK, so I'm not familiar with the NEC, or with the IEEE "coloured books" system. I'd be grateful if someone could let me know if the IEE "White Book" has anything to say about electrical load calculations for hospitals (e.g. "diversity", "coincidence", etc, when working back...
  13. briand2

    ABS Pipe Failure (Hot Water Service)

    I am involved with a situation where some ABS pipes have failed. Most of the failures appear to be cracks starting at the end of the pipe inside solvent-welded fittings, especially couplings. The cracks run from the end of the pipe, along the section of pipe inside the fitting, and then...
  14. briand2

    Compressor Discharge Pipework Natural Frequency

    I have an L-shaped pipework arrangement (about 3 inch diameter)connected to a compressor discharge and I want to see if I can calculated its natural frequency. Details are roughly as follows (starting at the top): Vertical pipe; copper; 20in long Vertical flexible connector (corrugated); 20in...
  15. briand2

    Failure of 11kV Cable

    I've just had a failure of an 11 kV cable in the connection box to the rear of a VCB. The cable is three-core, XLPE, armoured. The failure occurred after the point at which the cores had been separated. It looks to me like one of the cores was bent at too tight a radius; this is the only core...
  16. briand2

    Corrosion Of Cooling Water System Due To Chlorination

    I am responsible for several cooling tower water systems. Our standard procedures, etc require us to chlorinate the systems every six months. We used to get the measured Free Chlorine to 25 mg/l (equivalent to 25 ppm) and circulate for two hours. Recently, some of our colleagues have instead...
  17. briand2

    Select All Objects On One Layer

    I often want to select ALL objects on ONE layer (I am using AutoCAD LT 2000). Is there any way I can do this? Thanks for your help. Brian

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