Is there a hydro requirement on bank cylinders?

[AfterDark]

True. However, that does not mean they are safe, that your insurance company won't deny claims, or you have any defense if you get sued when one fails.

An insurance company deny a claim!?

 

[rob.mwpropane]

But why buy 6000 psi bottles? They hold less gas than 4500 psi bottles ( at 4500 psi). $800 each or for 4?

and, get them star stamped. Boom! 10 year hydro.

$800 for everything, includes 4 tanks and all the fittings to go with, and a whip with a regulator to adjust pressure out.

Do you know how many cf they would hold @ 4500? I think I could take them to 5000, I just didn't want to be too hard on my little compressor. So figure filling to 5000, but cooling to somewhere closer to 4500-4700.

 

[tbone1004]

But why buy 6000 psi bottles? They hold less gas than 4500 psi bottles ( at 4500 psi). $800 each or for 4?

and, get them star stamped. Boom! 10 year hydro.

what math are you using for that? Remember that Z-factor is significant at 6000psi at 1.2 vs 1.11 at 4500psi. Last I checked they were the same form factor as the 4500psi bottles so will hold roughly the same amount of gas. 510.5cf @6000->@4500=382.875*1.2/1.11=414cf, so that's close enough to the 444 that the 4500psi's are rated at and factors in the thicker walls

 

[Wookie]

what math are you using for that? Remember that Z-factor is significant at 6000psi at 1.2 vs 1.11 at 4500psi. Last I checked they were the same form factor as the 4500psi bottles so will hold roughly the same amount of gas. 510.5cf @6000->@4500=382.875*1.2/1.11=414cf, so that's close enough to the 444 that the 4500psi's are rated at and factors in the thicker walls

Yup, your math and my math are quite close. 4500# cylinders hold 444 ft3, and 6000# cylinders at 4500# holds 415 ft3.

 

[rob.mwpropane]

Yup, your math and my math are quite close. 4500# cylinders hold 444 ft3, and 6000# cylinders at 4500# holds 415 ft3.

That's pretty close. It was a fairly good deal (at least I think), and I can always go a little higher than 4500.

Thoughts?

 

[Wookie]

That's pretty close. It was a fairly good deal (at least I think), and I can always go a little higher than 4500.

Thoughts?

It’s a smoking deal.

 

[The Ruttmeister]

I was always under the impression hydro testing is required only for transportation. As far as I know if the tank stays in one place you can do what you want.

I think for those us that fill our own tanks...

(Clipped).

1. It's OSHA, or it's state counterpart that cares.
If you are a business, you need to comply with applicable standards.
That means hydro even if the cylinder is never transported.

2. If you are a private individual you can do whatever you want. Your own comfort with the liability is your business.
But if you never hydro or maintain a cylinder and it explodes, expect that to brought up in any lawsuit from anyone injured.

Personally I wouldn't want to put myself at risk for such a small saving. I like myself a lot, I don't want me dead or injured!

 

[Scuba Client]

Is it required that bank cylinders that are immobile be hydro tested every five years?

I tried to bring up the same subject but was blocked from doing so. I'm glad you brought it to the fore. I think the scuba industry needs to move forward and use QR-coded labels or stickers. Relevant information: previous owner, present owner, in test, work history can be documented on a national scale by simply using an iPhone. There is conflicting information on safety since employees’ have a right to work in a safe environment per se; a recognized hazard would be to purposely hit a tank with a hammer.

 

[Wookie]

I tried to bring up the same subject but was blocked from doing so. I'm glad you brought it to the fore. I think the scuba industry needs to move forward and use QR-coded labels or stickers. Relevant information: previous owner, present owner, in test, work history can be documented on a national scale by simply using an iPhone. There is conflicting information on safety since employees’ have a right to work in a safe environment per se; a recognized hazard would be to purposely hit a tank with a hammer.

A hammer test is a required test when filling cylinders in the United States that are allowed a 10 year hydro.

I invite you to sit back and learn something. It involves listening and shutting your pie hole.

 

[Scuba Client]

A hammer test is a required test when filling cylinders in the United States that are allowed a 10 year hydro.

I invite you to sit back and learn something. It involves listening and shutting your pie hole.

Provide a link to validate your assumptions.

Seeing is believing.


Buddhist monks have endowed me with the power of observation, power of thought, power of suggestion.