Recent content by eric2718

PHPK says that they have used STYCAST 2850FT epoxy with Catalyst 9 for six to seven years with great success on liquid helium dewars. I have used it with LN2 without any problems. Vendor 1...

Have you found a solution? It sounds like you have a leak into your vacuum space. I would imagine that out-gassing would be minimal in an old tank.

You probably have already solved this problem, but here is my answer anyway. We have found it quite easy to remove moisture from our system using a vacuum pump. However, our problem is the excess moisture that gets into the vacuum pump oil.

We have used standard compression fittings by Swagelok succesfully with hydrogen, which leaks as easily as helium. We have thouroughly tested the fittings for leaks with hydrogen up to 200 psi for ¼”, ½”, 1”, and 1-1/4” tubing. I have been told that VCR fittings by Swagelok, along with other...

Cryostar PD 3000 reciprocating pump 500 gallons 2 GPM 1.5" pipe no elevation change, 3 elbows, 2 globe valves No frosting No strainer Pump discharge pressure is 150-8000 psig, filling an accumulator to 8000 psig Pump and supply line are pre-chilled with LH2, this hydrogen is then vented The...

I have a LH2 tank. I can vary it's pressure from 10-150 psig, because I can control the setting of a back-pressure-regulator that controls tank venting. Can anyone recommend a method of calculating at what pressure to choose to operate my tank to get the best subcooled liquid to my pump. I...

Swagelok and other knock off brands of Swagelok can easily go to 300 bar. Type in compression fittings or tube fittings at www.mcmaster.com

When filling a chamber with gas to around 3000 psi, we get a lot of compression heating. When the filling is complete, and the gas sits in the chamber, the chamber slowly cools back to ambient temperature, therefore the pressure drops with it. When filling scuba diving tanks with oxygen, it is...

I am currently using ASME B15.5 flanges with oxygen, hydrogen, and nitrogen. At 150 psi, I am using an ASME B15.5 class 150# flange with a pure PTFE gasket (95665K44 by McMasterCarr). At 6000 psi I am using an ASME B15.5 class 2500# flange with a 316SS reinforced PTFE gasket (by Chesterton.

http://www.titanind.net/Cryo%20Tank%20Listings.html have many used tanks

www.industrialinsulation.com has many cryogenically rated insulation materials.

I have an accumulator supplying 8000 psi, -320°F nitrogen. After the accumulator, the nitrogen then passes through a mass flow meter and into a reaction chamber. This is a batching process, lasting 0.5-1.0 seconds and repeats every 6.0 seconds. The problem I'm having is that the flow moves so...