Faber Tank Purchase -- Weight is off, what am I missing?

[Landau]

You beat me to it.

Both of the previous post beat me

Well I would probably breath through my tank a few minutes faster than you too

 

[certainmisuse]

What are the exact markings on the tank? Could it be an M71DVB which matches " diameter measured larger by fractions of an inch and the length measured short by fractions of an inch." and 4 pounds heavier than the FX71DVB you ordered?

see: Blue Steel Scuba - Cylinder Specs

OK, I think you may be seriously onto the answer. It reads "M71S", not sure if that could be the same as M71DVB. There are many other markings on the tank, I will report them all tomorrow and see if the dimensions match these precisely.

 

[certainmisuse]

Bingo! The markings match the M71 tank referenced by Faber which is several pounds heavier. I got this from Divers Supply btw because they are local. Oddly I don't believe they have the M71 on their website. I'll check again. Either way, I plan to exchange. Thanks everyone, especially Landau!!

 

[MichaelMc]

Where did you see that? I don’t think have ever seen anything like that on cylinder markings. Or is it on a long wordy adhesive label?

Faber had "Do not over fill" stamped on the tank neck of the LP50 tanks I got. Not helpful when shops do not even understand the plus rating.

No, 10% above the stamped pressure is not an overfill. Its the DOT specified rating of the tank if it has the plus rating at hydro. Really. Once cooled. (as I understand from reading the spec)

 

[happy-diver]

Scubaboard Detectives!

Brilliant folks ha ha ha ha ha!

John Chatterton, a dude

with stuff

Hey there, I go purchase tanks that may become manifolded twins by eye
valves out, bottoms against a wall, straight edge square against the necks

half inch average length difference leaves them a bit too skewwhiff for me

 

[certainmisuse]

Final update:

Shop says they likely sent the M71 in error but may be due to the FX71 being discontinued. They will update the website to reflect. For now, I'm just going to swap the M71 for the FX80, because they are about the same weight (0.1 lbs difference) and of course more capacity. If anyone knows where I can get an "actual" FX71 let me know. I may buy one in the future.

Thanks again all!

 

[northernone]

An expensive and complex option is carbon fiber tanks... the weight savings on the tanks are transfered to more lead needing carried... but that can be done incrementally in several trips into the shallows. (Presuming shore diving). I had a period of time it was the best solution for my body (and could borrow the tanks).

Something to consider perhaps.

Cameron

 

[BikerBecca]

@certainmisuse they're pressed not really machined so there is variation. Valves are around 2lbs depending on the valve, boot is probably another pound or so. If it's painted gray, it will have extra weight from the paint as well.

This is the video of how steel tanks are made that you'll find in the PADI e-Learning Dive Theory materials. It's pretty cool.