UAL Bagsmasher From United States of America, joined Sep 1999, 2130 posts, RR: 11 Posted (8 years 3 months 3 weeks 5 days 6 hours ago) and read 3649 times:
I have a question about those boosters that boost a tank of o2 at 700psi and boost it up to 1800psi. Basically you hook up compressed air to the booster, turn on your o2, and it boosts away and brings the pressure of the oxygen up to the proper level for aircraft servicing. My question is this: Is there any way internally that the booster can leak resulting in the compressed air mixing with the oxygen?
Dl757md From United States of America, joined May 2004, 1555 posts, RR: 18 Reply 1, posted (8 years 3 months 3 weeks 5 days 6 hours ago) and read 3606 times:
Sorry, never heard of servicing O2 this way. What exactly do you mean by a booster? At Dl we remove the O2 bottle from the A/C and take it to our O2 servicing room where we service it through a manifold supplied by industrial cylinders of aviators O2. Aviators O2 is the same purity as Medical O2 but has a lower moisture content to prevent condensation which can freeze causing a blockage of the O2 lines. There is no way that ambient air can enter even in the event of a leak due to the greatly higher pressure of the O2 as compared to the ambient air.
L-188 From United States of America, joined Jul 1999, 29350 posts, RR: 62 Reply 2, posted (8 years 3 months 3 weeks 5 days 5 hours ago) and read 3570 times:
Not familiar with this either.
At the company I got laid off from they built their own O2 cart. It had 4 bottles that where hooked together and connected to a welding valve.
The way it worked is that when the tank in the plane got low, you hooked the cart up to the service port. You then started with the tank with the lowest pressure and then opened it up, after it equalized with the pressure in the tank you closed it and then went to the tank with the next highest pressure and so on.
Since the O2 bottles came from Airgas with 2200 PSI in them we had no difficulty getting the air in the aircraft up to 1800 psi.
We service both internal bottles on the aircraft and the 02 bottles in the cabin that where built into the med-beds our lifeflight aircraft had installed.
OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
DL_Mech From United States of America, joined Feb 2000, 1761 posts, RR: 10 Reply 3, posted (8 years 3 months 3 weeks 4 days 20 hours ago) and read 3471 times:
Onboard Oxygen servicing was an option offered by Boeing and was installed (and deactivated) on our ex-Western Airlines aircraft. Here's a photo showing the servicing door located just aft of the red nose jacking pad.
T prop From United States of America, joined Apr 2001, 996 posts, RR: 1 Reply 4, posted (8 years 3 months 3 weeks 4 days 19 hours ago) and read 3467 times:
I'm surprised that people who service O2 have never heard of an O2 booster.
It is possible to service using just the servicing cylinder and no booster, but when the service bottle pressure drops below 1800, you're not going be servicing any more. A servicing cylinder with a little less than 1800 psi still has a lot of O2 left in it. A booster allows you to scavenge the cylinder down to a 100 psi or so.
As far as booster drive air contaminating the O2 stream, on the model I use, it's not possible. The drive section is isolated from the gas compression section by a chamber that is vented to atmosphere.
Air2gxs From , joined Dec 1969, posts, RR: Reply 5, posted (8 years 3 months 3 weeks 4 days 16 hours ago) and read 3448 times:
I've used the boosters on nitrogen before, but never O2. But to answer your question; yes, if I remeber the operation correctly (been 15 years or so) the compressed air can mix with the product being boosted, but I don't think you'll get the proper boost and that should clue that there is a problem.
L-188 From United States of America, joined Jul 1999, 29350 posts, RR: 62 Reply 6, posted (8 years 3 months 3 weeks 4 days 11 hours ago) and read 3428 times:
LIke I said T-prop, we just worked from the lowest bottle on the cart up to the highest.
OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
Cheekie747girl From , joined Dec 1969, posts, RR: Reply 7, posted (8 years 3 months 3 weeks 4 days 10 hours ago) and read 3421 times:
We at LHR on our aircraft use a (pure) oxygen recharge cart, which is attatched to the charging point (optional fit) on the aircraft via a hose and uses differential pressure between the aircraft and the cart to charge the oxygen cylinders on the aircraft. This is done when the O2 pressure on the aircraft drops below acceptable levels, under very strict procedures. The only compressed air is the oxygen itself.
I understand that this maintenance practice is not permitted in the US and elsewhere for safety reasons.
L-188 From United States of America, joined Jul 1999, 29350 posts, RR: 62 Reply 8, posted (8 years 3 months 3 weeks 4 days 10 hours ago) and read 3415 times:
We at LHR on our aircraft use a (pure) oxygen recharge cart, which is attatched to the charging point (optional fit) on the aircraft via a hose and uses differential pressure between the aircraft and the cart to charge the oxygen cylinders on the aircraft. This is done when the O2 pressure on the aircraft drops below acceptable levels, under very strict procedures. The only compressed air is the oxygen itself.
I understand that this maintenance practice is not permitted in the US and elsewhere for safety reasons
Actually I think you just described what we did with our homemade cart perfectly.
You single? Maybe we could discuss servicing techniques some time in the future?
OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
UAL Bagsmasher From United States of America, joined Sep 1999, 2130 posts, RR: 11 Reply 10, posted (8 years 3 months 3 weeks 4 days 6 hours ago) and read 3385 times:
The reason for my question was that some people I talked with said that using Nitrogen as the boosting gas is perfectly safe. I say, if there is any possibility of the two mixing, you are in deep s***.
HAWK21M From India, joined Jan 2001, 31201 posts, RR: 58 Reply 11, posted (8 years 3 months 3 weeks 4 days 5 hours ago) and read 3377 times:
On our B737s the On line Charging of O2 is not carried out for Safety reasons,Only O2 bottle changing is carried with O2 pr drops to lowest despatch levels.
regds
MEL
L-188 From United States of America, joined Jul 1999, 29350 posts, RR: 62 Reply 12, posted (8 years 3 months 3 weeks 4 days 4 hours ago) and read 3373 times:
as long as they are at regular intervals
Great. but not fluid servicing, we only just met.
We have reputations to maintain
OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
CaptOveur From , joined Dec 1969, posts, RR: Reply 13, posted (8 years 3 months 3 weeks 4 days 3 hours ago) and read 3367 times:
A related question. I saw these tanks rolling around last time I flew AA out of SAT. I was wondering if these were Oxygen tanks like what is being discussed here. I thought O2 tanks would be green or something, these appeared more black.
Air2gxs From , joined Dec 1969, posts, RR: Reply 14, posted (8 years 3 months 3 weeks 3 days 19 hours ago) and read 3350 times:
I believe you are looking at nitrogen tanks. I don't remember if it's a requirement (FAR) but I believe all oxygen used on aircraft must be stored in a green cylinder.
Jetstar From United States of America, joined May 2003, 1523 posts, RR: 10 Reply 15, posted (8 years 3 months 3 weeks 3 days 16 hours ago) and read 3331 times:
I believe it is also a federal DOT (Department of Transportation) regulation that all oxygen bottles are painted green. Look at a welding rig and you see the oxygen bottle is green. Same with medical oxygen bottles.
The bottles attached to the pick up truck are definitely nitrogen. This is the cart the mechanics use to service tires and struts.
L-188 From United States of America, joined Jul 1999, 29350 posts, RR: 62 Reply 17, posted (8 years 3 months 3 weeks 3 days 6 hours ago) and read 3311 times:
Those gas cylinders are considered shipping contaniers and governed by DOT regs. As other as alluded to.
Each gas is supposed to have it's own color bottle since some combinations of gases can lead to bad consequences....filling a O2 bottle with Acytlene for example.
Now you will see stainless bottles with the gas color around the port. This is legal too. You see medical O2 bottles like this all the time. Just the area around the port is painted green.
OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
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