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I am trying to bring an old drawing up to date. It shows a copper casting with helicoil inserts to take M10 steel studs. The drawing says "Drill 10.3 dia to suit M10 helicoil 15 long" and it shows the hole depth as 17mm long. Can someone confirm that this hole specification is sensible for a...

I wish to suspend a perfectly cyclindrical 250kg glass ingot 1m below a crosshead mechanism that will itself travel down a pair of vertical linear guides. It is abolutely vital that the axis of the cylinder is on the centreline through a furnace below,as well as the centreline of the guide rail...

Can anyone tell me typical values for the energy requirements for the production of Liquid Oxygen in say kWh/tonne? Some publication must exist somewhere with this sort of information but I would not know where to start looking - a Googlesearch has not turned up much. I need the information to...

Thanks guys. On the issue of the option to weld the bosses on to a thin shell, we have discussed this but fear the distortion will lead us to lose the tight tolerances we need for the inner shell surface. In fact this vessel is to be used as a type of casting mould - a bit like spin casting...

I wish to make a stainless steel vessel that will have a final vertical wall dimension of 14" bore and outside diameter 15.5" x 11" high. Does anyone know how/whether I can get such a pipe fabricated? I will also need a thick stainless disc some 15.5" diameter x 4" thick that will be...

In the past we had to drill a stright hole 2 metres long at 60mm diameter. We found that keeping the drill stationary and turning the 2 metre long part worked extremely effectively. It does not seem immediately obvious why it work but it seems that the system "wants" to drill straight!

We have a number of old Lefevre Glass Working Lathes that are in need of overhaul. These are large diameter (8"+) through bore headstock lathes used in the glass-working industry. The Lefevre company seems to have sunk without trace. Does anyone know of a source of any information that exists...

Does anyone know of any guidance available for the design of water cooled copper busbars? I want to use copper tubes to run at high current (>5000 Amps) but low voltage (20 Volts) to feed a resistance heating furnace. I can find lots of information about the current carrying capacity of flat...

I need to drive a leadscrew through a drive belt connected to an AC motor. In the fast up/down mode I need to achieve a leadscrew rotation that will give about 1500mm/minute. In process mode I need to control the leadscrew rotation downwards in the range 10 to 25 mm/minute with a constnat...

I a working with low pressure oxygen and hydrogen single-stage regulators. Can anyone suggest a website where I can find some curves that show for a typical regulator what the variation of outlet pressure is for a given flowrate for a variation in Inlet Pressure. Also how will the oultet...

OK, so let's see where we go from here! We actually have four vaporisers that cycle in pairs to allow the ice to melt between cycles. One idea I have is to put all four into simultaneous service if the weather conditions are such as to cause fog with just two in service. My reasoning here is...

Thanks for the responses. I am sure I recall seeing a TV programme some time ago in the UK. It described how a village in a particularly dry part of the world had rigged up screens of some sort on the top of a hill to "catch" the hill fog that occurred on frequent occasions. I seem to...

I have a large vaporiser (heat exchanger) that is used to supply oxygen gas to a facility from a Liquid oxygen tank. It is an ambient air vaporiser which I understand draws heat from a downdraught of air passing through the vaporiser by convection. My problem is that we are using so much gas...

For what it's worth, I have just received a quotation for a similar system requirement. We have to neutralise waste acid rinse water during the normal course of events but quarterly we need to treat the strong washing acid. The supplier has specified a two-step neutralisation system. The...

Thanks SAK9. A chimney has a certain elegance about it. Basically the "ball" of flame is burning at 3300degC and is fed by 120 m3/hr of H2 and 60 m3/hr of O2. Putting these two together gives a ball of 3300degC and a total volume of 50 litres per second of hot steam! Does anyone know...

I originally posted this question on LEV Forum but I think perhaps HVAC may get more of you replying! I have a 400kW heat source (H2/O2 flame) and I need to remove the heat from it. THe flame is about 5 metres below roof level. I estimate that if I have a flow of 1 cubic metre/second then I...