About the LHe Vessel

A kind of the LHe Vessel

 The LHe vessel comes with many different kinds. A practical thing is divided into two of the following with those containers roughly by an insulation method.Now a super insulation method becomes the mainstream.
 The using most frequent material at the beginning was glass.Lately,the using metal materials are an aluminum and a stainless steel.Metal becomes the mainstream aluminum, stainless steel recently.In addition, in these days,,sometimes using FRP at neck part on the liquid tank because of well insulation.

A Vacuum Pull of an Insulation Tank(Re-exhaust)

To vacuum pull of an insulation our vessel, that belongs to cryogenic lab(Re-exhaust)please talk to us first.

 The most of the vessel of the insulation vacuum tank loses vacuum degree by using longtime.It needs to vacuum pull(re-exhaust) The time of vacuum pull is varies by individuality and condition. There is no certain time to do it, but from our experience ,we do the vacuum pull as listed bellow.

A vacuum pull goes in the following procedures.

About Pre-Cool Down

At the liquefy room, liquid helium container cools it in liquid nitrogen and then put liquid helium in it. In nitrogen being heavier than helium, please make it around 30% of container capacity. Doing the pre-cool down is about one week. in the mean time, do the weight measurement and measure volume of evaporation of liquid nitrogen.The evaporation volume is under 0.1〜0.2kg/day, then fill the liquid helium,but if over than readings do the vacuum pull again.


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