CO2 cylinder weights

[prv]

I've just serviced my Jon Buoy in preparation for the new season. Technology-wise, it's essentially a large manual lifejacket, so I checked it in much the same way. Left inflated hard for 24 hours, no noticeable pressure loss. Thorough visual inspection. Tested the light according to its manufacturer's instructions. And weighed the inflation cylinder.

The cylinder had a label saying "min gross weight 1299g". It weighed 1303g; over the minimum so I've happily repacked it, but I was a little surprised how small the amount over the minimum was. I imagined there would be a greater tolerance than that. Are most people's lifejacket bottles healthily over the limit?

(To be clear, I'm asking only out of curiosity. I'm not concerned about repacking this bottle and don't plan to take any action based on this post.)

Pete

 

[VicMallows]

Think about how much of that weight is the cylinder, and how much the CO2. Is there no tare weight stamped on the cylinder?

Vic

 

[prv]

Forgot to look - and it's all carefully packed up again now so I'm not going to take it out and check

Pete

 

[Boathook]

Think about how much of that weight is the cylinder, and how much the CO2. Is there no tare weight stamped on the cylinder?

Vic

It should be and is stamped on all my cylinders so far.

 

[Ceejay]

I weighed eight life jacket cylinders yesterday, and they were all exactly 2 grammes above the minimum weight which was marked on the cylinders.
Incidentally. I weighed them at the local post office; cheers for that guys.
CJ

 

[VicMallows]

they were all exactly 2 grammes above the minimum weight

......but assuming the resolution of the scales was 1 g, there might have been a variation between the actual cylinder weights of up to 0.99 g

 

[Tintin]

I think all that matters is that they are on or over the designed weight that should be marked on the cylinder. No worries, you're fine.

 

[prv]

No worries, you're fine.

I know that. If I didn't think it was fine, I would have popped over to Ocean Safety five minutes from my house and bought a new one

Just surprised that it's a mere 4 grams over the nominal weight, that's all. Seemed a fine tolerance to me.

Pete

 

[Tintin]

I know that. If I didn't think it was fine, I would have popped over to Ocean Safety five minutes from my house and bought a new one

Just surprised that it's a mere 4 grams over the nominal weight, that's all. Seemed a fine tolerance to me.

Pete

Yeah, I thought the same when I checked all my lifejackets this winter, but I guess with modern manufacturing they can get it made to close tolerances.