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ResMed Hose Length?
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genes Offline

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Posts: 59
Joined: Sep 2012

Machine: Respronics Auto Cpap
Mask Type: Nasal mask
Mask Make & Model:
Humidifier: Respronics
CPAP Pressure: 17 -20
CPAP Software: EncorePro

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Sex: Male
Location:

Post: #21
RE: ResMed Hose Length?
Interesting, indeed. And it would also be interesting if someone would test a 15 mm hose and a 22 mm hose of the same length to see if the width of the hose makes any difference and, if so, how much.

I agree with the previous posts on pressure loss. To quantify it
There are formulas to estimate the pressure loss but measurement is always better.

The diameter of the hose does make a difference. The pressure loss in the hose is normally proportional to the length of the hose and to the square of the velocity. This may not make sense unless you have worked with the formulas but at any given flow rate if you compare an equivalent length of a 15 mm dia hose to a 22 mm diameter hose the smaller hose will lose about 2.15 times as much pressure as a 22 mm hose. A 10' 22 mm hose would have less loss than a 5' 15 mm hose. there are other losses to consider but these are major ones.

I looked at a manual for a Resp. bipap auto and it says that it automatically compensates for a 6' hose but additional pressure drop will occur when other restrictive elements are added to the patient circuit. It has a graph showing the additional loss from a bacteria filter and when a bacterial filter is also used with a humidifier. It says to use a manometer to verify the patient mask pressure.

I think that this applies more when the machine is in the non auto mode because as was said the auto mode tends to get the pressure right to eliminate apneas.

It seems like especially with older machines you need to read the providers manual to understand how the machine handles the various pressure losses in the circuit. I think I will always try to use an auto machine.

GeneS
11-03-2012 11:28 PM
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Denial Dave Offline

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Posts: 25
Joined: Oct 2012

Machine: Redmed S9
Mask Type: Full face mask
Mask Make & Model: Quattro Full Face Mask
Humidifier: H5i
CPAP Pressure: 21 inhalation 15 exhalation
CPAP Software: ResScan SleepyHead

Other Comments: love pad-a-cheek liners

Sex: Male
Location: Connecticut

Post: #22
RE: ResMed Hose Length?
I've been searching for a shorter hose for my S9 machine. Something along the lines of 4 -5 ft in length.

Any clue why the slimline tubing from Resmed is 6 ft long and their climate line tubing is 6ft 6 inches long?

I've learned to deal with the slimline, but adding those extra 6 inches made the tubing like wrestling with a live snake last night.

:-)
11-04-2012 04:16 PM
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JJJ Offline

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Posts: 751
Joined: Apr 2012

Machine: ResMed S9 Autoset
Mask Type: Nasal mask
Mask Make & Model: Most recent: Wisp, Pilairo, Mirage Vista
Humidifier: ResMed S9 Autoset
CPAP Pressure: 17-20
CPAP Software: SleepyHead

Other Comments:

Sex: Male
Location: USA 97217

Post: #23
RE: ResMed Hose Length?
(11-04-2012 04:16 PM)Denial Dave Wrote:  Any clue why the slimline tubing from Resmed is 6 ft long and their climate line tubing is 6ft 6 inches long?

Probably because 6.5 feet at 15 mm diameter holds the same volume of air as 6.0 feet at 22 mm diameter.
11-04-2012 05:31 PM
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zonk Offline

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Posts: 7,908
Joined: Feb 2012

Machine: A10 AutoSet
Mask Type: Nasal mask
Mask Make & Model: Activa LT
Humidifier: Integrated /ClimateLineAir
CPAP Pressure: 9/13
CPAP Software: ResScan

Other Comments: CPAP since Nov 2010

Sex: Male
Location: Australia

Post: #24
RE: ResMed Hose Length?
both climateline and slimline hoses are 15 mm hoses
11-04-2012 05:37 PM
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