Leak Detection at High Temperatures: Need Help

[Saladsamurai]

I have a vessel (~2 liters) that is filled with gases for combustion. It is made of some sort of steel and has various ports drilled out for diagnostic instruments. The vessel is spherical and is made from 2 hemispheres with flanges that are bolted together. An o-ring helps to seal the vessel. At room temperature and at ~8 atm, I have virtually no leaks. However, when I preheat the steel vessel to ~500 °F I encounter significant leaks at the same pressure of ~8 atm.

I am aware that there are a number of design considerations that may be causing the leaks, but right now I need to find a way to verify where the leaks are by some means of detection. Soapy water tests are out of the question because of the temperature. I rented a helium leak detector, but since it is based on thermal conductivity, I believe I am getting a lot of false positives.

The next step up for leak detectors involves mass spec which is very substantial investment. Does anyone have any experience with leak detection at these temps and pressures? Are there any analogous 'high temp soap tests'?

I have honestly even considered experimenting with soybean oil (smoke point of 450 °F) to see if I can produce a visible leak. Any thoughts on this?

Thanks for reading.

 

[daza87]

These guys might be able to help:

<< Link removed by Moderator >>

 

[boneh3ad]

IR thermography perhaps?

 

[Polosoft]

I have a vessel (~2 liters) that is filled with gases for combustion. It is made of some sort of steel and has various ports drilled out for diagnostic instruments. The vessel is spherical and is made from 2 hemispheres with flanges that are bolted together. An o-ring helps to seal the vessel. At room temperature and at ~8 atm, I have virtually no leaks. However, when I preheat the steel vessel to ~500 °F I encounter significant leaks at the same pressure of ~8 atm.

I am aware that there are a number of design considerations that may be causing the leaks, but right now I need to find a way to verify where the leaks are by some means of detection. Soapy water tests are out of the question because of the temperature. I rented a helium leak detector, but since it is based on thermal conductivity,http://www.ashisoft.com" I believe I am getting a lot of false positives.

The next step up for leak detectors involves mass spec which is very substantial investment. Does anyone have any experience with leak detection at these temps and pressures? Are there any analogous 'high temp soap tests'?

I have honestly even considered experimenting with soybean oil (smoke point of 450 °F) to see if I can produce a visible leak. Any thoughts on this?

Thanks for reading.

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[h2obuilding]

You may use water leak alarms for detecting any kind of water leak. Alarm generates a sound as soon as it detects any leak. It can be categorize as active and passive water leak alarms.
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Leak Detection