Meg cold diving - QC4 leak

henckell · 30th January 2008, 19:53

The HP coupler is a 207 bar system operating at 8 to 10 bar and it will
leak if the coupler is moved at the connection point.

Stephane · 30th January 2008, 20:26

Henckell is right, Swagelok clearly specifies in the data-sheet that when coupled, the connectors must not be rotated.

tibby · 30th January 2008, 20:40

I don't think I ever tried to rotate it but it's unavoidable for the hose to move side-tiside as you don/doff the unit in it's stock configuration. It makes me very nervous when I don the meg to hear gas leaks behind my head. However, since it only happens when very cold I can deal with it.
Tibby

Hyper-limits · 30th January 2008, 23:41

I had the same experience last week-end, as soon as I turn the O2 on it start leaking. It was only about -5C outside. I unplug the male end and plug back in and everything was fine.

Al

jdicediver · 11th February 2008, 17:55

The QC4 system on a Meg is NOT manufactured by Swagelok. The actual male quill made by Swagelok is somewhat different, being that the internal (pin) and collet are integral, not like the one ISC supplies as stock. I had problems with my male QC4 from new, and have since replaced it with the ACTUAL Swagelok item. The Male QC 4 from Swagelok is 100% interchangeable with the ISC item, and I have confirmed that the female connector need not be replaced to correct the leaking.

lancsman · 12th February 2008, 08:57

Quote: (Originally Posted by jdicediver)

The QC4 system on a Meg is NOT manufactured by Swagelok. ....... The Male QC 4 from Swagelok is 100% interchangeable with the ISC item, and I have confirmed that the female connector need not be replaced to correct the leaking.

Is there any issue with O2 compatability or is it just a cost issue that has made ISC go with an other manufacturer?

Mark

jdicediver · 12th February 2008, 14:12

Quote: (Originally Posted by lancsman)

Is there any issue with O2 compatability or is it just a cost issue that has made ISC go with an other manufacturer?

Mark

IMHO, probably a cost issue, as Swagelok product is expensive. All components (from both mfg) are likely 02 compatable or ISC wouldn't use them. Undoubtably <most> users have had no problems with the QC4. I did, and subsequently have had no leaking at the fitting connections since the retrofit. If I get a chance, I will post comparative pics showing the obvious differences later tonight.

O2Slide · 12th February 2008, 15:08

First Post

The Whole Fitting Is A Bit Over Engineered And Delicate For The Application. I Would Think A Fitting Along The Line Of The Adv Hose Connector Fitting Would Work. Besides, It Didn't Pass My Plastic Truck Bed Liner Slide And Slam Test.

Destructive Testing Is My Specialty

tibby · 12th February 2008, 15:30

Quote: (Originally Posted by jdicediver)

IMHO, probably a cost issue, as Swagelok product is expensive. All components (from both mfg) are likely 02 compatable or ISC wouldn't use them. Undoubtably <most> users have had no problems with the QC4. I did, and subsequently have had no leaking at the fitting connections since the retrofit. If I get a chance, I will post comparative pics showing the obvious differences later tonight.

Thanks John, pics would be greatly apreciated. I'm a bit surprised as Jerry at ISC told me it's a Swagelock part.
Tibby

jdicediver · 12th February 2008, 16:17

Quote: (Originally Posted by O2Slide)

First Post

The Whole Fitting Is A Bit Over Engineered And Delicate For The Application. I Would Think A Fitting Along The Line Of The Adv Hose Connector Fitting Would Work. Besides, It Didn't Pass My Plastic Truck Bed Liner Slide And Slam Test.

Destructive Testing Is My Specialty

The ADV hose connector fitting would not work specifically because of it's design and the fact that the QD is clean/fast is of obvious benefit. The existing fitting is well suited to the application, and yes, though I generally do not like SS tube fitting type connections, it is quite possibly best-fit for application, pending the connection is kept clean. But, that having been said, I rarely drag my Meg through the mud...

30th January 2008, 19:53	#21 (permalink)
henckell New Member Current Rebreather/s: Megalodon Classic Kiss Other Rebreather/s: Join Date: Aug 2005 Location: Sweden Posts: 88	Re: Meg cold diving - QC4 leak The HP coupler is a 207 bar system operating at 8 to 10 bar and it will leak if the coupler is moved at the connection point. __________________ http://www.rekodeko.se
(Offline)

30th January 2008, 20:26	#22 (permalink)
Stephane Hey! Ho! Let's go! Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Nov 2005 Location: Nantes - France Posts: 708	Re: Meg cold diving - QC4 leak Henckell is right, Swagelok clearly specifies in the data-sheet that when coupled, the connectors must not be rotated. __________________ Stéphane Hammer-rEvo powered!
(Offline)

30th January 2008, 20:40	#23 (permalink)
tibby untitled Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: May 2007 Location: Salt Lake City, UT Posts: 325	Re: Meg cold diving - QC4 leak I don't think I ever tried to rotate it but it's unavoidable for the hose to move side-tiside as you don/doff the unit in it's stock configuration. It makes me very nervous when I don the meg to hear gas leaks behind my head. However, since it only happens when very cold I can deal with it. Tibby __________________ Does the voice of reason change when you add helium to the mix?...hmm
(Offline)

30th January 2008, 23:41	#24 (permalink)
Hyper-limits Custom Title Allowed! Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Apr 2006 Location: Victoria BC Canada Posts: 112	Re: Meg cold diving - QC4 leak I had the same experience last week-end, as soon as I turn the O2 on it start leaking. It was only about -5C outside. I unplug the male end and plug back in and everything was fine. Al __________________ "The oldest and strongest emotion of mankind is fear. And the oldest and strongest kind of fear is fear of the unknown" H.P. Lovecraft
(Online)

11th February 2008, 17:55	#25 (permalink)
jdicediver Single/burdened with cash Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Jun 2006 Location: Calgary, Alberta Posts: 253	Re: Meg cold diving - QC4 leak The QC4 system on a Meg is NOT manufactured by Swagelok. The actual male quill made by Swagelok is somewhat different, being that the internal (pin) and collet are integral, not like the one ISC supplies as stock. I had problems with my male QC4 from new, and have since replaced it with the ACTUAL Swagelok item. The Male QC 4 from Swagelok is 100% interchangeable with the ISC item, and I have confirmed that the female connector need not be replaced to correct the leaking. __________________ Regards; "Alterations performed under controlled conditions, on a closed course by a qualified Closed Circuit Diver" "Some people shouldn't dive...others shouldn't even get wet".
(Offline)

12th February 2008, 08:57	#26 (permalink)
lancsman New Member Current Rebreather/s: Not Bought Yet Other Rebreather/s: Megalodon Not Bought Yet Join Date: Oct 2005 Location: UK, Flitwick Posts: 60	Re: Meg cold diving - QC4 leak Quote: (Originally Posted by jdicediver) The QC4 system on a Meg is NOT manufactured by Swagelok. ....... The Male QC 4 from Swagelok is 100% interchangeable with the ISC item, and I have confirmed that the female connector need not be replaced to correct the leaking. Is there any issue with O2 compatability or is it just a cost issue that has made ISC go with an other manufacturer? Mark
(Offline)

12th February 2008, 14:12	#27 (permalink)
jdicediver Single/burdened with cash Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Jun 2006 Location: Calgary, Alberta Posts: 253	Re: Meg cold diving - QC4 leak Quote: (Originally Posted by lancsman) Is there any issue with O2 compatability or is it just a cost issue that has made ISC go with an other manufacturer? Mark IMHO, probably a cost issue, as Swagelok product is expensive. All components (from both mfg) are likely 02 compatable or ISC wouldn't use them. Undoubtably <most> users have had no problems with the QC4. I did, and subsequently have had no leaking at the fitting connections since the retrofit. If I get a chance, I will post comparative pics showing the obvious differences later tonight. __________________ Regards; "Alterations performed under controlled conditions, on a closed course by a qualified Closed Circuit Diver" "Some people shouldn't dive...others shouldn't even get wet".
(Offline)

12th February 2008, 15:08	#28 (permalink)
O2Slide New Member Current Rebreather/s: Megalodon Other CCR Home Build Other Rebreather/s: Other CCR Home Build Join Date: May 2005 Location: Rockford Illinois Posts: 6	Re: Meg cold diving - QC4 leak First Post The Whole Fitting Is A Bit Over Engineered And Delicate For The Application. I Would Think A Fitting Along The Line Of The Adv Hose Connector Fitting Would Work. Besides, It Didn't Pass My Plastic Truck Bed Liner Slide And Slam Test. Destructive Testing Is My Specialty
(Offline)

12th February 2008, 15:30	#29 (permalink)
tibby untitled Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: May 2007 Location: Salt Lake City, UT Posts: 325	Re: Meg cold diving - QC4 leak Quote: (Originally Posted by jdicediver) IMHO, probably a cost issue, as Swagelok product is expensive. All components (from both mfg) are likely 02 compatable or ISC wouldn't use them. Undoubtably <most> users have had no problems with the QC4. I did, and subsequently have had no leaking at the fitting connections since the retrofit. If I get a chance, I will post comparative pics showing the obvious differences later tonight. Thanks John, pics would be greatly apreciated. I'm a bit surprised as Jerry at ISC told me it's a Swagelock part. Tibby __________________ Does the voice of reason change when you add helium to the mix?...hmm
(Offline)

12th February 2008, 16:17	#30 (permalink)
jdicediver Single/burdened with cash Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Jun 2006 Location: Calgary, Alberta Posts: 253	Re: Meg cold diving - QC4 leak Quote: (Originally Posted by O2Slide) First Post The Whole Fitting Is A Bit Over Engineered And Delicate For The Application. I Would Think A Fitting Along The Line Of The Adv Hose Connector Fitting Would Work. Besides, It Didn't Pass My Plastic Truck Bed Liner Slide And Slam Test. Destructive Testing Is My Specialty The ADV hose connector fitting would not work specifically because of it's design and the fact that the QD is clean/fast is of obvious benefit. The existing fitting is well suited to the application, and yes, though I generally do not like SS tube fitting type connections, it is quite possibly best-fit for application, pending the connection is kept clean. But, that having been said, I rarely drag my Meg through the mud... __________________ Regards; "Alterations performed under controlled conditions, on a closed course by a qualified Closed Circuit Diver" "Some people shouldn't dive...others shouldn't even get wet".
(Offline)

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