Hi Peter, At APS/SBC sector 19 all shipping dewars are turned upside down until all LN2 drains out, this is repeated 2-3x times to remove the residual caught in the top. With this method there is no free LN2 remaining in the dewars to leak out. During the upside down tipping the dewars must not be bumped. The ANL shipping Department has been instructed to verify that the dewars are empty of LN2 by turning them upside down prior to shipping.
When pucks are not used we caution all users to place vials securely in the dewars using canes with tabs or placing the bottom of one against the top of another and using plastic sleeves, to prevent the pins from being dislodged from the vials. Steve Ginell **************************************************** Stephan L. Ginell, Ph.D. Coordinator, SBC User Program Biosciences Argonne National Laboratory 9700 S. Cass Ave Argonne, IL 60439 (630)252-3972 office (630)218-8122 pager (630)252-6126 Fax [EMAIL PROTECTED] Email On 8/25/08 6:41 PM, "Peter Zwart" <[EMAIL PROTECTED]> wrote: > Dear all, > > Due to the presence of residual liquid nitrogen in dry shippers > 'steaming' out of a tipped-over dewar on a Fedex dock, we (PX-ers in > the ALS) have been placed under some scrutiny with regards to > dry-shipping dewars. In particular, I am interested in how people > empty their dewars/pucks/vials and prepare them for dry-shipment and > how they and/or their shipping department checks if the dewars are > empty indeed. > > Cheers > > Peter Zwart
