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...
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...
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...
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
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...
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...
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...
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...
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
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...
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...
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...
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...
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...
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...
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...
