Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

LOx Tank Failure at Toronto hospital

LOx Tank Failure at Toronto hospital

RE: LOx Tank Failure at Toronto hospital

If the safety system had not worked correctly the tank would be somewhere else and empty of LOX.

The event was most likely started by a leak between the liner and the outer shell. This space is normally filled with loose perlite and then pumped to good vacuum to create the Cryogenic rated insulation.
If this vacuum space gets a small amount of LOX in it the space will overpressure, and blow out the rupture disc. The rupture disc is set to protect the liner from crushing (external pressure). At the time of the video there is still a considerable amount of LOX in the tank, the liner may be torn but if not the boiling lox will be venting out relief valves, so further trouble is unlikely.

It is an expensive failure, as the tank is likely not repairable.


RE: LOx Tank Failure at Toronto hospital

Here is what the tank looked like (Google Street-View, screen-capture):

Lots of frozen condensation on the radiator to the right.


RE: LOx Tank Failure at Toronto hospital

The frozen condensation is a given; seems light given other evaporators I've seen.

RE: LOx Tank Failure at Toronto hospital

I had to chuckle walking through a SAGD plant. The laggers had insulated everything in sight, including the evaporators for the liquid nitrogen tank.

"Why not the best?"
Jimmy Carter

RE: LOx Tank Failure at Toronto hospital

We used to cool drinks in our vaporizers.

LOX does scare me, but this almost a non-event. It is likely that they are using less oxygen these days with less elective surgery going on these days. When the over pressure relief blows it is supposed to vent up a stack, but it looks like the line leaked into the vacuum and blew out some of the vermiculite. MVE (or whoever built the tank) will be able to fix this easily.

I have seen photos of a LOX leak (bottom of tank failure) and the ensuing fire. Cars were reduced to small lumps of ash with only a little iron left and everything else gone. The asphalt parking lot was turned into 6" deep loose gravel. With that much oxygen everything burns.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

RE: LOx Tank Failure at Toronto hospital

About 15 years ago I installed a control system in a water plant that used ozone. They had two large LOX tanks to supply oxygen to make the ozone. One night a small plane crashed on the plant grounds. The fire ball from the crash got to within 15 ft of the two tanks! Luckily no one was killed.

RE: LOx Tank Failure at Toronto hospital

For anyone planning to work with oxygen pipelines (industrial and medical systems included) ASTM G88 - 13 Standard Guide for Designing Systems for Oxygen Service is strongly recommended. It records many of they impressively scary features of these systems.

During my apprenticeship one of my early encounters with this was watching a Electric Arc Furnace operator using a torch consisting of only 20 ft of 1/2 inch steel pipe, connected to a 150 psig oxygen pipeline. The task was to cut loose some yellow hot steel stuck to the roof of his furnace. The job used up about 5 feet of the torch.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


The Low-Code Digital Transformation Guide
Change the way you develop apps and, in turn, change the way your business operates and engages with customers, leading to new channels of revenue. This ebook is the culmination of 14 years of experience with 4,000 customers that have all transformed their business through low-code development. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close