Lp Inflator Hoses on Doubles

[ermaclob]

normally when i use doubles i use this configuration

FKD - Doubles Regulator Config

from what i understand is that the Lp hose for the wing is on the right #1 because at is the primary buoyancy device that goes on the primary reg/ post and also because if there was an out inflation issue u could shut of the reg, with your right and dump air from the wing with your left hand at the same time. not having to risk shooting up while you fight to get the hose off the wing inflator.

similarly the dry suit inflator is on the left because its the redundant buoyancy and also in case of auto inflation you turning the left post off would put your drysuit dump valve in the perfect spot to release gas.

am i Right??

Im asking this because i was consulting a cave diving instructor a few days ago that said that the way he does his classes is that, the wing hose goes on the left and the drysuit goes no the right (opposite). he clames he does this so that you can tell when you roll off your left post by accident on the cave ceiling when your wing stops inflating mid dive.

is this a common practice?? ive only seen and heard about the "normal way" of setting up the hoses.

 

[Dr. Lecter]

normally when i use doubles i use this configuration

FKD - Doubles Regulator Config

from what i understand is that the Lp hose for the wing is on the right #1 because at is the primary buoyancy device that goes on the primary reg/ post and also because if there was an out inflation issue u could shut of the reg, with your right and dump air from the wing with your left hand at the same time. not having to risk shooting up while you fight to get the hose off the wing inflator.

similarly the dry suit inflator is on the left because its the redundant buoyancy and also in case of auto inflation you turning the left post off would put your drysuit dump valve in the perfect spot to release gas.

am i Right??

Im asking this because i was consulting a cave diving instructor a few days ago that said that the way he does his classes is that, the wing hose goes on the left and the drysuit goes no the right (opposite). he clames he does this so that you can tell when you roll off your left post by accident on the cave ceiling when your wing stops inflating mid dive.

is this a common practice?? ive only seen and heard about the "normal way" of setting up the hoses.

I rig my doubles in what you call the "normal way" and haven't seen anyone who did it the way this instructor describes (though roll-off is less of an issue in wrecks and I don't cave dive). While I can see his point about noticing a roll-off due to a lack of wing inflation, I would counter that his approach gives up the substantial benefits in reducing task loading provided by the "normal way" in order to gain something you already have -- rigged the "normal way" you'd notice a roll-off due to a lack of SPG change/drysuit inflation. Maybe he almost never touches his drysuit inflator or looks at his SPG?

 

[DaleC]

deleted

 

[rongoodman]

I've run across references to it over on Yorkshire Divers and think I saw something about in the IANTD cave text, along with a number of other strange things. I've never seen an instructor do it other than the "normal" Hog manner.

 

[PfcAJ]

Im asking this because i was consulting a cave diving instructor a few days ago that said that the way he does his classes is that, the wing hose goes on the left and the drysuit goes no the right (opposite). he clames he does this so that you can tell when you roll off your left post by accident on the cave ceiling when your wing stops inflating mid dive.

is this a common practice?? ive only seen and heard about the "normal way" of setting up the hoses.

You should be checking your valves after ANY contact with the ceiling. Your wing not working shouldn't be what you rely on, and do you really want to figure out that the post is closed by losing your buoyancy in a cave? Smash.

Drysuit hose on the left allows you to shut down the post while venting gas, and having the inflator on the right allows you to shut down the right post while dumping gas with your left hand through the inflator. If you flip-flop them, both of those go right out the window.

There's a reason that its 'the normal way'

 

[darushin]

I do my inflator hose on the left. The reason being is that as explained above in a cave scenario it is easier to detect a roll off, and the other being safety in a black out. I want as few hoses and items as possible connected to my right post because in a black out that one is safer then the left. As my instructor put it to me "In a black out situation with a post failure, do you really want to swim 1000 ft out of the cave in the dark with only line contact while risking a left post roll off?"

Daru

Also for those curious, I was trained to dive a drysuit on a separate pony bottle.

 

[ajduplessis]

PfcAJ pritty much summed it up very well. Check values after contact with ceiling and keep setup configured as "normal". Relying on inflation failure to indicate roll-off is a dangerous and silly approach to overhead environments!!! Cave diving is a precise activity and the processes and procedure have been developed and tested by the elite in the sport. Stick to what works and don't over-think things.

When pooh hits the fan you don't want a snowball effect!!!

---------- Post added December 18th, 2012 at 10:20 AM ----------

I do my inflator hose on the left. The reason being is that as explained above in a cave scenario it is easier to detect a roll off, and the other being safety in a black out. I want as few hoses and items as possible connected to my right post because in a black out that one is safer then the left. As my instructor put it to me "In a black out situation with a post failure, do you really want to swim 1000 ft out of the cave in the dark with only line contact while risking a left post roll off?"

Daru

Also for those curious, I was trained to dive a drysuit on a separate pony bottle.

During my cave training it was made very clear to always put the line in just above the floor thus removing any potential contact with the ceiling. Line placement is vital!!

I don't want to find out during a "black out" that my inflator is not working :blessing:

 

[rongoodman]

...the other being safety in a black out. I want as few hoses and items as possible connected to my right post because in a black out that one is safer then the left. As my instructor put it to me "In a black out situation with a post failure, do you really want to swim 1000 ft out of the cave in the dark with only line contact while risking a left post roll off?"

I don't understand what you mean by this.

 

[darushin]

PfcAJ pritty much summed it up very well. Check values after contact with ceiling and keep setup configured as "normal". Relying on inflation failure to indicate roll-off is a dangerous and silly approach to overhead environments!!! Cave diving is a precise activity and the processes and procedure have been developed and tested by the elite in the sport. Stick to what works and don't over-think things.

When pooh hits the fan you don't want a snowball effect!!!

---------- Post added December 18th, 2012 at 10:20 AM ----------


During my cave training it was made very clear to always put the line in just above the floor thus removing any potential contact with the ceiling. Line placement is vital!!

I don't want to find out during a "black out" that my inflator is not working :blessing:

I agree lines should be at ground, but after a few dives out of Ginnie and Little River with no light, I can say the gold line was laid with the best of intentions. I guess in the end it is all comfort level. I have done entire dives with a malfunctioned inflator so to me losing an inflator isn't as life threatening as a post rolling off in the dark. If the wing is still good I can just orally inflate the wing as needed, and with my drysuit on a separate line I can use it to make the slight adjustments necessary with respect to addition of air.

 

[PfcAJ]

How is a roll off in the dark any different than a roll off with the lights on? Reach back and turn it on... You don't need to be able to see to pull that off.