When computers fail

[Se7en]

Originally posted by Uncle Pug


You do check your pressure and gas mixture before leaving the shop anyway.... right????

the consequences of a double operator failure such as letting monkeys fill your tanks and then you not checking them is taken care of by turning the dive.... go home sloppy diver - go home!

Mike do you dive doubles???

When I fill my tanks it is always through the right hand post with the left hand post on and the SPG monitoring the fill.

OK... I'll admit it, I'm slack. I let the dive shop fill my tanks, and often don't check till I'm gearing up...

Agreed - having to turn a dive is fit punishment for being sloppy and not checking.

As for my diving - most of it is single tank and when I do use doubles, it is most often as independant doubles - so I'm used to the two SPGs. I think I've only used manifolded doubles 3 or 4 times - and they have obviously always been someone elses kit.
However, I'm signed up for the Cavern course, so now have to set up my own doubles - and am leaning towards Iso manifold rather than the equally acceptable (for the course) independant doubles. And once I have the manifolded doubles, I suspect I'll use them often, as there are a lot of 35m to 45m dives locally, which it would be nice to have the redundancy for.

My initial question was as to why DIR are so against having 2 SPGs - The only response to that is that a LH first stage failure is so rare that the added complexity of a second SPG is pointless. I tried to compare it with the complexity of an Iso manifold, to query why have one and not the other?

I guess that an Iso protects at least half your gas, while an additional SPG just gives you the piece of mind of knowing how much gas you have left in the event of either having to use the Iso, or in the event of a LH 1st stage freeflow. While I don't NEED it, even at the other end of a wreck in 40m, if I shut down my LH post due to a freeflow, I'd like to be able to see how much air I have left to navigate back along the wreck and ascend. I feel more comfortable when I know how much air is left, rather than thinking there is enough, but still waiting on that hard to draw breath.

UP - thanks for the tip of leaving the LH reg on with SPG while filling through the RH post. I'd not thought of that previously.

ciao
Mike

 

[Uncle Pug]

Originally posted by 100days-a-year
the three pile system.

I've got a slight problem here Tony....

Seems Uncle has got all the piles you mentioned plus a few more....

There is the one in the shop, the one in the garage, the one in the boat, the one in the house, the one on the other boat, the one in the truck, the one in....

Not to mention the one that shows up on ebay now and then

 

[roakey]

Originally posted by Se7en
My initial question was as to why DIR are so against having 2 SPGs - The only response to that is that a LH first stage failure is so rare that the added complexity of a second SPG is pointless. I tried to compare it with the complexity of an Iso manifold, to query why have one and not the other?

Because the SPG is THE most failure prone piece of equipment on your rig. I've probably seen somewhere between 1/2 and one dozen SPGs fail in various ways over the years. I've seen the hose blow, the stem breaking, etc.

Because you abort the dive when you have to isolate, the importance of knowing exactly how much gas you have is of far less importance than actually CAUSING a dive to be aborted because of your addition of another high-probability point of failure, as is found with an extra SPG.

Roak

 

[sharpenu]

I originally started this thread as a discussion of gas integrated computers for Rec diving. Maybe I should have been more specific, but I assumed that because there is a section called "Tek Talk" that the technical diving discussions would be found there. Why does every thread on this board end up as a long drawn out discussion on tech issues that frequently have little to do with the original thread? Can we either go back to the original topic or move this thread to the tech area where it (now) belongs?

 

[Uncle Pug]

Originally posted by sharpenu
I originally started this thread as a discussion of gas integrated computers for Rec diving.

Sharp....

Threads do mutate to follow lines of interest and no offense is meant nor should be taken by the original poster....

This divergent stream of conversation is a direct result of considering your ideas concerning SPGs....

Now if you want to see how far and fast threads can veer from the starting topic to conversations totally removed not only from scuba but common decency... check out rec.scuba... sometimes it only takes one iteration!!!

Anyway I digress from your recent post....
You are right.... it does seem like many threads move into a technical discussion...
And perhaps that is why the tech forum was created....

So we will shut up here and move it to its proper place....

:wave:

 

[100days-a-year]

Uncle Pug,whattabout the pile that gets mailed to me?Did I mention you're my FAVORITE uncle.Sharpenu,sorry it's just that tech diving is fraught with long-winded ,oppinionated trolls

 

[Uncle Pug]

Originally posted by 100days-a-year
Uncle Pug,whattabout the pile that gets mailed to me?

Honey...

HONEY!!!!

Hey, did Waste Management pick up that pile of stuff sittin' out in front of the shop???

Oh... OK.... thanks...

Shoot!!!


sorry Tony... it's already gone...

 

[100days-a-year]

1 man's trash is another man's dive gear.I have more than a few things that I've dove with that were found in garage sales.I have Parkway ,Dacor S/S buckles,weights and even tanks that were about to be consigned to that pile.

 

[Norm]

So what's wrong with Dacor stainless steel buckles? I still use them!

 

[100days-a-year]

Nothin'I like'em better than anything new.