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I'm trying to find out the transfer rate of methanol through a ~1mm sheet of Polypropylene. Can any one help? I've done a fairly extensive search on the web and have good data for HDPE which is a reasonable match I beleive but its PP data that I specifically require. Thanks for your help

I'm trying to find out the transfer rate of methanol through a ~1mm sheet of Polypropylene. Can any one help? I've done a fairly extensive search on the web and have good data for HDPE which is a reasonable match I beleive but its PP data that I specifically require. Thanks for your help

I'm trying to find out the transfer rate of methanol through a ~1mm sheet of Polypropylene. Can any one help? I've done a fairly extensive search on the web and have good data for HDPE which is a reasonable match I beleive but its PP data that I specifically require. Thanks for your help

Gents, I'm trying to source relief valve(s) to vent up to 5000 lpm of air at -20°C from a 30m x 6m x 5m coldroom with a back pressure not greater than 100 Pa. Does anyone have any experience of venting on this scale. I've looked into using banks of small (100mm dia) commercial valves designed...

I'm trying to determine the stiffness of a perforated plate 25mm thick arrayed with through holes 1.7mm dia on a 4.5mm horizontal and vertical pitch. The holes are in a square array (not honeycombed. I've found data on perforated sheet but not thick plate. Anyone out there had a similar...

Can anyone help me to determine the relationship between the slip torque of a wrap spring clutch and the pre assembly interfence of the spring internal diamter and the hub. I'm trying to determine the sensitivity of the clutch slip torgue to manufacturing tolerances. Cheers Justin

Hi, Thanks for taking the time read this post... Does anyone know whether there are compressors and refrigerants available that would transfer ~200W at -80°C evaporating, -25°C condensing? The unit would be located in a -20°C room, hence the low condensing temperature. I'd like to avoid a...

I am currently evaluating the design of some large but lightly stressed welded storage frames. We have many years of experience of similar designs fabricated in mild steel (S275/43A) operating in a -20°C environment. My concern is that that the new generation of frames will be in service at...

I am currently evaluating the design of some large but lightly stressed welded storage frames. We have many years of experience of similar designs fabricated in mild steel (S275/43A) operating in a -20°C environment. My concern is that that the new generation of frames will be in service at...

I am currently evaluating the design of some large but lightly stressed welded storage frames. We have many years of experience of similar designs fabricated in mild steel (S275/43A) operating in a -20°C environment. My concern is that that the new generation of frames will be in service at...

Not strictly a cryogenic application but.. I am currently evaluating the design of some large but lightly stressed welded storage frames. We have many years of experience of similar designs fabricated in mild steel (S275/43A) operating in a -20°C environment. My concern is that that the new...

I have a particulary difficult sealing problem that I hope someone may be able to help me with. I'm trying to create a gasket seal between an thick aluminium plate and the side walls of a 24 deep well polycarbonate plate. Within the plate are different strains of bacteria isolated in separate...

Hi, I'm trying to source a miniature steam generator (~2kW)for a medical application. I required steam at around 3 barg and the boiler must be capable of running continuously over extended peroids of time. The closest I have come so far to finding a unit is stripped down coffee makers and a...

Thanks for you comments. Although the moisture is in very low concentrations I am still interested in what happens to it as the equipment I am designing must not suffer from icing over an extended period (2 - 5 years. To prevent icing I intend to place the dewar in a very dry environment (-60...

Can anyone recommend any good reference books on the design of mechanisms for use at liquid nitrogen temperatures? Any information on humidity control and elliminating icing within nitrogen dewars would also be very welcome.

A BOC data sheet for liquid nitrogen I am using specifies a moisture content of 2vpm (2ppm by volume?). The question I have is what happens to the moisure as the nitrogen boils off in my dewar? Does it evolve with the nitrogen gas or remain in the liquid increasing in concentration?