Brand new HP100 air fills

[apenland01]

The shop should have a gauge. If the shop gets testy when you tell them you want to check the fill, that's not a good sign. Make sure to tell them it's a HP tank the next time go you for fills and point the 3442 out to them on the tank itself.

Best way to get tanks filled with least trouble to you is drop them off on your lunch hour, if possible, and pick them up after work. Tanks get filled, and then topped off after they've cooled down.

Good advice, but unfortunately, I waited till the last minute to get the tanks filled for what might be diving Sunday. I'm fishing all day tomorrow and Saturday, so this was my only chance to get the tanks filled for the holiday weekend. Being in a hurry didn't help much in this case....

 

[Kohanbash]

I always remind the store of the fill pressure since HP100’s look similar to Al80’s.

 

[happy-diver]

Never take it back and question people right or wrong or right it's their joint and it pisses them off
even of there's a coke freak filling your tanks to 150 bar the shop will eventually find out and fix it

Next fill you strike up a conversation however brief where you feign interest
ask about their procedure and the fill pressure of the tank escapes your lips

If you are one of the wanting a fill NOW ones there is something very wrong

 

[Compressor]

Just so you know @apenland01, you paid for a 100 to get filled and you got 84 cf of air.

 

[bletso]

Here is a chart I made up for local dive shop. You can get a pretty good idea of temp effects on fill pressure.

 

[Compressor]

Thank you @bletso for the PDF file.
What equation did you use for calculations? Boyle and Charles Law?

Also curious on how you measure the tank temp? Does one shoot one to those Infrared temp guns?

 

[bletso]

I use an infra-red temp gauge. We fill N2, He, Ar, and 75/25 welding gases. Not much scuba anymore.. (P1*V1)/T1 : (P2 * V2)/T2

 

[Barnaby'sDad]

Never take it back and question people right or wrong or right it's their joint and it pisses them off
even of there's a coke freak filling your tanks to 150 bar the shop will eventually find out and fix it

Next fill you strike up a conversation however brief where you feign interest
ask about their procedure and the fill pressure of the tank escapes your lips

If you are one of the wanting a fill NOW ones there is something very wrong

Sometimes it's not a matter of being unreasonable and "wanting a fill now." ex. For me...and I'm sure plenty of others that don't live in dive country...it's 1+ hour each way to get to a dive shop. I can't make the trip Monday to Friday during their business hours, so that leaves Saturday and Sunday.

If a shop is unwilling to do same day fills (ex. Drop off at 9:00 am, run errands, and pick-up whenever they get to it), I would have to plan out two weekends in advance (they weren't even willing to do a next-day fill) just to have tanks filled and ready to go for a local dive day. Two days of driving...4+ hours drive time...to get a couple tanks filled.

One shop that I did that drop off and pick up routine with (drop one weekend and pickup the next)…I came in to get my tanks and they were sitting where I left them...unfilled. The shop owner said "oh, well we don't close until 6:00 pm (it was after 5:30 pm when I showed up), I was planning on filling them." Literally just two tanks sitting there a few feet from the fill station where I'd left them a week earlier...not dozens of tanks and mine just got lost in the mix or something. I just took the hint and haven't been back since.

Some dive shops are not run like a business. They're a hobby. A place for someone with more money than they know what to do with to hang out, shoot the s**t with like-minded people, and live the dive lifestyle. The trick is identifying shops like that and avoiding them.

 

[boulderjohn]

In my experience, AL 80 cylinders filled at a reasonable rate to 3,000 PSI will end up at 2,800. I worked for a shop that had a governor on their fill station to fill to that level, and every tank I ever got from there for instruction was at 2,800. I will bet that is what happened to you--you got filled to 3,000 and cooled to 2,800.

 

[p_kos]

In my experience, AL 80 cylinders filled at a reasonable rate to 3,000 PSI will end up at 2,800. I worked for a shop that had a governor on their fill station to fill to that level, and every tank I ever got from there for instruction was at 2,800. I will bet that is what happened to you--you got filled to 3,000 and cooled to 2,800.

This shouldn’t happen, fill it at a reasonable rate to 3200 then.