Hose for low pressure low temperature N2?
Hose for low pressure low temperature N2?
(OP)
I have very little cryogenic experience and I'm trying to find a well insulated hose that will remain very flexible at cryogenic temperatures.
I'm trying to supply roughly 0.5 CFM of nitrogen gas at about 100K and atmospheric pressure to a cryostat device. I was thinking that hose with ~1/2" ID would be an appropriate size.
The device is mounted on a motorized stage and will travel 1" in X,Y and Y axes so the hose needs to be very flexible as to not resist motion.
Does anyone have any ideas??
Thanks
I'm trying to supply roughly 0.5 CFM of nitrogen gas at about 100K and atmospheric pressure to a cryostat device. I was thinking that hose with ~1/2" ID would be an appropriate size.
The device is mounted on a motorized stage and will travel 1" in X,Y and Y axes so the hose needs to be very flexible as to not resist motion.
Does anyone have any ideas??
Thanks





RE: Hose for low pressure low temperature N2?
Most of my applications have been flexible until fixed onto the test equipment and then remain stationary for the low temp period, however that said the N2 pipes don't last very long.
B
RE: Hose for low pressure low temperature N2?
RE: Hose for low pressure low temperature N2?
1. Use VJ with bayonets on each end.
2. Use VJ with pipe fittings on each end, then insulate the pipe fittings with closed cell foam insulation.
You can purchase VJ hose from a wide variety of sources including ACME Cryogenics, Technifab, Cryofab or look for any of the suppliers here:
http://www
I wouldn't suggest calling one of the industrial gas companies. They don't generally make their own VJ equipment, and for something like this, if they even quoted on it, they'd more than likely be just reselling you something from one of the above manufacturers.
If the gas doesn't have to stay cold, then just use a piece of stainless steel, flexible metal hose that can be obtained just about anywhere. Even McMaster Carr has it. You will need to clarify the requirements for flow rate (SCFM or lbm/sec would be better than CFM), heat leak, temperature and pressure if you need more advice.
RE: Hose for low pressure low temperature N2?
You may find talking to AS Scientific a help as they deal with customers for scanners and large electromagnets but have a wealth of experience if you didn't want a gas manufacturer - http://www.asscientific.co.uk/
The vacuum pipeline systems are a big part of what they manufacture.
B
RE: Hose for low pressure low temperature N2?
We used these and similar type hoses in the same manner as your OP with a definite change out schedule.
htt
Addenda:
Our loops were all vertical.
RE: Hose for low pressure low temperature N2?
I'll let you guys know how things turn out.