Dressel Cozumel - Gas Warning!

[Capt Jim Wyatt]

Its a bummer

 

[ggunn]

It's all too common as mentioned in my signature for years.

Replying to what I said: At any rate I don't think that combustion and breathing gas compression can happen in the same cylinders.

I still do not see how that could happen.

 

[NDL_Diver]

This one looks better, for scuba. More $$, though.

Carbon Monoxide Super-Meter | 0.1 ppm | Scuba | USA NIST Calibration

Low level carbon monoxide meter which is the most sensitive detector on the market providing 0.1ppm of carbon monoxide gas resolution. low level CO detector, low level carbon monoxide detector, low level CO alarm, low level co monitor, carbon monoxide meter.

www.forensicsdetectors.com

User replacable sensor or battery? Calibration requirements, yearly? Can it be done by user.

 

[NDL_Diver]

Replying to what I said: At any rate I don't think that combustion and breathing gas compression can happen in the same cylinders.

I still do not see how that could happen.

When oil passes through the rings and compressed it ignites or flashes the oil (think diesel engine but only a very small poof since we talking only a little oil).

 

[USdiver1]

When oil passes through the rings and compressed it ignites or flashes the oil (think diesel engine but only a very small poof since we talking only a little oil).

And even though the compressor oil is manufactured to ISO 46 standards, and is combustion resistant, it can still ignite and cause CO issues in a reciprocating air compressor.

The filtration system usually gets the small amount of oil blow through, but if the rings are worn or broken, well that can overwhelm the filters.

 

[ggunn]

When oil passes through the rings and compressed it ignites or flashes the oil (think diesel engine but only a very small poof since we talking only a little oil).

I see; that doesn't mean intentional combustion.

 

[NDL_Diver]

I see; that doesn't mean intentional combustion.

Correct, it is on the compressor piston regardless of drive motor. Diesel can flash at about 300 psi (temp dependent) . Lubrication oil has a higher flash point. SCUBA compressors are multi stage where last stage is over 3500 psi.

 

[rmssetc]

I'd love to if they weren't like $400

They aren't $400.

See:

R

Thread 'Semi-DIY O2 and CO analyzer'

Oct 9, 2021

I'm convinced of the benefit of analyzing tanks for O2 percentage and presence of CO (carbon monoxide).

I was a kickstarter supporter of Cootwo, and still think it was a great concept and form factor. I was unhappy with the lack (and tone) of support from Divenav in the past. On my last dive trip I found that my Cootwo was giving really wonky readings (O2 randomly off by 5~10%, despite having a good sensor, recent calibration, etc) and the CO sensor was due for replacement/calibration. With Divenav out of business (or at least, out of the business of hardware products -- maybe they still...

• rmssetc
• analyzer carbon monoxide cootwo diy nitrox oxygen sensorcon
• Replies: 9
• Forum: Computers, Gauges, Watches & Analyzers

• 

Thread 'Quality Carbon Monoxide Detectors for Scuba Cylinders'

Jun 25, 2024

My wife and I recently read a story from a FaceBook page called Scuba Accidents and Risk Management Techniques for Divers. In that article, they refer to a possible CO poisoning. They did make reference to a new nitrox detector that they DM on the dive was struggling to use. I don't know if it was O2 toxicity or CO poisoning. I have a O2 detector I am well very used to using. I am wondering if having a CO detector is over kill or if I should actually get one. I would like to know the following from the wealth of knowledge here:

A) is it necessary?
B) Which brand/manufacturer should I...

• wlecyt40
• Replies: 38
• Forum: General Scuba Equipment Discussions

• 

Thread 'Forensic Detectors Carbon Monoxide (CO) Detector Review'

Jun 17, 2022

Like everything I write, this is long and detailed, and you may not need much of this detail. I use a CO monitor both for continuous CO monitoring of my compressor, as well as ad-hoc checking of tank fills I get elsewhere. This is divided into sections so that you can skip the sections you don't care about, or skip to the next post to get to the details of the unit -- of *course* this is more than 10,000 characters...

Compressor CO Monitoring​

For just about as long as I've had a compressor, I've had Carbon Monoxide (CO) monitoring. I use a Nitrox stick, and I wanted a way...

• tmassey
• co analyzer co meter compressor
• Replies: 3
• Forum: Computers, Gauges, Watches & Analyzers

• 

 

[CG43]

Replying to what I said: At any rate I don't think that combustion and breathing gas compression can happen in the same cylinders.

If the air temperature in the cylinder becomes too high, part of the lubricating oil mist that is always present is oxidized. This can be caused by cooling problems or by a compression ratio that is too high.
Now the compression ratio of any decent breathing air compressor is so low that there are no problems
as long as the working compression ratio is correct.

But if, for example, the last stage is not pumping properly then the pressure that the penultimate stage has to pump increases , and if the pressure relief valve between these stages is not working properly then the penultimate stage will overheat and produce more CO2 and CO .

 

[Nemrod]

Replying to what I said: At any rate I don't think that combustion and breathing gas compression can happen in the same cylinders.

I still do not see how that could happen.

Lubrication oil bypasses the (worn) rings and is burned in the cylinders due to the heat of compression. It happens. The amount of oil is very, very small but it is enough to produce combustion byproducts like CO.