Tank always filled under 3000psi

[Kohanbash]

Every time I get a fill from my LDS the tank pressure is around 2600-2700psi? Is there a reason it would consistently be under 3000psi?

Note: This is a standard aluminum 80.

Thanks

 

[Froggle]

They probably fill to 3000 while hot. Show more leg or tell them you're not happy with it...

 

[SOFDiver]

It would appear that they haven't figured out how to provide a 3000psi fill. They might be filling too fast and cutting off the fill when they reach 3000, which will cool down to 26-27k. Choices are very slow fill, or over fill to 3400 psi which will cool to 3000-3100.

 

[Kohanbash]

Thanks. I just googled hot fill and that explains this. The tank gets filled in 15minutes or so and there is no water bath when they fill it.

 

[seeker242]

In other words, you're getting screwed because they don't know how to do a hot fill. The other alternative is to drop it off, have them fill it and pick it up the next day and have them top it off.

 

[northernone]

A kind conversation how you'd enjoy a full fill should help. Or a generous tip and a wink at whosoever is running the compressor.

 

[HantsDiver]

A kind conversation how you'd enjoy a full fill should help. Or a generous tip and a wink at whosoever is running the compressor.

Why should he have to beg or bribe people to get a proper fill?

I come from a none tipping culture. But if I came to North America (where my brother lives) and went diving I wouldn't be paying extra for people to do their jobs properly. I'd be telling them it was unacceptable that they didn't do it in the first place.

And I have a special hatred for underfilling cylinders after working in a place where I'd often have to cut dives because people started with 150 bar.

 

[arew+4]

Our tell them you want a prorated discount, they'll say sure 10% off the fill, you say no... 10% off the entire cost of your dive day including gas tips etc.

 

[waves_221]

Are you dropping off and picking up later or waiting for the fill? If you are waiting and they fill to 3000 it'll cool down to 2700-2800 on a 10-15 minute fill. Filling slower will be closer to 3000 once cooled. If you're picking up, they could/may just top you off before you leave. The top off would be best without overfilling or you could do a 3300 and cool to 3000.

 

[Bob DBF]

My LDS hits the service pressure almost every time. Probably because they have been doing it a long time and don't fill real fast and know what the tank will cool to. If you are a regular, an old steel 72 will be 2300 to 2400#.

As an aside, water baths do not do much cooling as the heat starts internally and the water is not a factor until after the tank is already filled, at which point the tank is usually pulled out.


Bob