Help Urgent help re fit Max Dog to N2 Cylinder

[JWL]

After a postponement of a few weeks I'm finally aiming and hoping to ctb on Friday 4th.

BUT...I've just done a test connect of my Max Dog flow valve to the cylinder and get the following (see pics):

1. With setting at 0 cylinder shows full, correctly, but huge escape of gas and whining sound around the Max Dog nut. I connected this 'hand tight' as in the Betty videos.

2. With setting at 15L per minute and plastic tube attached, it flows through the tube, but still kind of gushing around the nut. Can you see/say from the pics if it looks about right connection-wise?

I tightened the nut a bit with an ill-fitting spanner and that helped. I don't have one that absolutely fits, so off to buy one now.

Questions for fellow N2 ctb members if you can help here.

1. Have you also found that hand tight is not enough, and if spanner tight is that all I need to solve this very worrying last minute problem?
2. Assuming everything finally works, when I actually set at 15L per minute flow on ctb day/time, do I need to turn the cylinder valve on full or half way or what?

 

[frees]

but huge escape of gas and whining sound around the Max Dog nut. I connected this 'hand tight' as in the Betty videos.

It is beyond me how 'hand tight' could work with high pressure connections like this. Dont't know how the Exit International came up with this. Use a wrench or spanner.

Is this UK or US standard?

Edit: For question 2: Proper way is turning on full, there is a stop after some turns. But will work if only opened partially

 

[DarkTear]

I have the same problem with the EU-version of the Max Dog regulator.
I'm quite unsure whether the gas escapes through the (faulty?) valve or because of a bad connection between the gas tank and the max dog regulator. Are you sure that it's leaking around the Max Dog nut?

I tightened the nut a bit with an ill-fitting spanner and that helped. I don't have one that absolutely fits, so off to buy one now.

Did that help?

 

[Dawn0071111]

I think to seal a leakto use plumbers tape before screwing it on?

 

[JWL]

It is beyond me how 'hand tight' could work with high pressure connections like this. Dont't know how the Exit International came up with this. Use a wrench or spanner.

Is this UK or US standard?

Edit: For question 2: Proper way is turning on full, there is a stop after some turns. But will work if only opened partially

UK standard.

I have the same problem with the EU-version of the Max Dog regulator.
I'm quite unsure whether the gas escapes through the (faulty?) valve or because of a bad connection between the gas tank and the max dog regulator. Are you sure that it's leaking around the Max Dog nut?


Did that help?

Yes, I bought a correct fit spanner and it seems to be fine now. I'll do another test today. But what the hell's the deal with that Betty video where this fragile old lady gives it a few turns and says "Don't need a spanner"? Yeah, right, I almost had a room full of nitrogen.

 

[dras23]

¿And at what exact pressure do I have to open the cylinder valve, so it doesn't end in just 6 minutes?

PD:to see if there are leaks, do a: bubble test gas leak, with soap and water, as you can see on youtub.. ^^

 

[dstryr]

Had the same thing happen. Took my regulator to the welding shop where I'd purchased the gas (label peeled off of course) and told them about my issue, they helpfully demonstrated connecting the regulator to a gas tank using a spanner and then there was no leakage. I bought a spanner, problem solved I thought.

At home, leaking persisted even with spanner use. Despite doing everything as they showed me and tightening it as hard as possible. Agree with frees, they shouldn't be claiming you can hand-tighten it. M D recommends thread sealing tape and bubble test as dras23 mentions.

 

[fightingsioux]

Had the same thing happen. Took my regulator to the welding shop where I'd purchased the gas (label peeled off of course) and told them about my issue, they helpfully demonstrated connecting the regulator to a gas tank using a spanner and then there was no leakage. I bought a spanner, problem solved I thought.

At home, leaking persisted even with spanner use. Despite doing everything as they showed me and tightening it as hard as possible. Agree with frees, they shouldn't be claiming you can hand-tighten it. M D recommends thread sealing tape and bubble test as dras23 mentions.

Among other things, I was a metal sculpture artist for 50 years, lots of welding. Familiar with inert gases, cylinders, regulators, hoses, etc. I'm also very familiar with this CTB method--was going to be mine before I changed.

Happy to help anyone with any technical issues, here or PM.

 

[dras23]

Among other things, I was a metal sculpture artist for 50 years, lots of welding. Familiar with inert gases, cylinders, regulators, hoses, etc. I'm also very familiar with this CTB method--was going to be mine before I changed.

Happy to help anyone with any technical issues, here or PM.

¿And at what exact pressure do I have to open the valve of a 40 cubic foot cylinder? I mean, the cylinder pressure valve and not the 15 lmp . Thanks

 

[fightingsioux]

¿And at what exact pressure do I have to open the valve of a 40 cubic foot cylinder? I mean, the cylinder pressure valve and not the 15 lmp . Thanks

You can't control the pressure with the main cylinder valve, it is what it is, control is what the regulator is for. So open the valve all the way and the regulator will be pressurized (filled). You then use the valve on the regulator to adjust your desired flow rate as measured by the regulator's flow gauge, for this usage 15-20 LPM.

 

[dras23]

You can't control the pressure with the main cylinder valve, it is what it is, control is what the regulator is for. So open the valve all the way and the regulator will be pressurized (filled). You then use the valve on the regulator to adjust your desired flow rate, for this usage 15-20 LPM.

sorry I didn't explain myself well
¿How many psi do I have to open the regulator from 0 to 3000 psi, for a cylinder of 40 cubic feet?

 

[fightingsioux]

I now understand.

Your concern is with flow rate --LPM (liters per minute.) Don't worry about pressure.

There is a complex relationship between flow rate, pressure and nozzle size. With a mathematical formula, if you know two of these quantities you can always calculate the third.

But that's difficult and time-consuming. So to make it easier, certain regulators come with a flow gauge, also called a flow meter.

For this usage, you should have this type of regulator. The flow rate should then be set at 15-20 LPM.

 

[dras23]

I now understand.

Your concern is with flow rate --LPM (liters per minute.) Don't worry about pressure.

There is a complex relationship between flow rate, pressure and aperture size. With a mathematical formula, if you know two of these quantities you can always calculate the third.

But that's difficult and time-consuming. So to make it easier, certain regulators come with a flow gauge, also called a flow meter.

For this usage, you should have one of these types of regulators. The flow rate should then be set at 15-20 LPM.

¿Can I set the regulator to 3000 psi and the flow meter at 15 lpm?
¿And would it be fine too, set it to 500 psi, while the regulator is at 15lpm?
I don't understand why in the YouTub nitrogen exit failure part 2 video, he says he should have put it at 5 instead of 15. By putting it at 15 he was spent in just 6 minutes.

 

[fightingsioux]

¿Can I set the regulator to 3000 psi and the flow meter at 15 lpm?
¿And would it be fine too, set it to 500 psi, while the regulator is at 15lpm?
I don't understand why in the YouTub nitrogen exit failure part 2 video, he says he failed to put it at 15 instead of 5 and was spent in just 6 minutes.

I don't know what regulator you have. But for this usage--what we're talking about here--you need a regulator with a flow meter.

Assuming that you have one, simply turn the valve of the regulator until the flow is anywhere in the range of 15-20 LPM.

Do not worry about the pressure. It's the flow that's important. You are only inflating a small turkey roasting bag, not a blimp!

OT: I did not look at your video and never look at them. If a person does their research & reading, takes a lot of time doing this, they will learn all there is to learn about this simple method. If you gather the correct materials, connect them correctly, and meticulously follow the correct procedure, it is 100% effective.

No offense, my friend, but you need to do more basic research. Take your time. Don't rush.

Start off on this site in the Research Compilation section. Read the mega-thread on Exit Bag & Inert Gases. The OP, TiredHorse, did an excellent job of giving step-by-step instructions.

Then, in the same section, find the link for the PPH (Peaceful Pill Handbook) and read the section about this subject.

Then, online, there are many other good, factual, reliable sources. On YouTube, you will find videos about how to properly construct an exit bag, how to attach a regulator, etc.

Best of luck.

 

[dras23]

I don't know what regulator you have. But for this usage--what we're talking about here--you need a regulator with a flow meter.

Assuming that you have one, simply turn the valve of the regulator until the flow is anywhere in the range of 15-20 LPM.

Do not worry about the pressure. It's the flow that's important. You are only inflating a small turkey roasting bag, not a blimp!

OT: I did not look at your video and never look at them. If a person does their research & reading, takes a lot of time doing this, they will learn all there is to learn about this simple method. If you gather the correct materials, connect them correctly, and meticulously follow the correct procedure, it is 100% effective.

No offense, my friend, but you need to do more basic research. Take your time. Don't rush.

Start off on this site in the Research Compilation section. Read the mega-thread on Exit Bag & Inert Gases. The OP, TiredHorse, did an excellent job of giving step-by-step instructions.

Then, in the same section, find the link for the PPH (Peaceful Pill Handbook) and read the section about this subject.

Then, online, there are many other good, factual, reliable sources. On YouTube, you will find videos about how to properly construct an exit bag, how to attach a regulator, etc.

Best of luck.

Thank you very much for the information, because the video confused me. Greetings