SPG correction

[JDog]

spankey---- How did I get sucked into this simple thread? Why did you do this to me? I only wanted to help.

 

[JDog]

spankey- I see you have altered your origional post. This whole thread is now moot.

 

[spankey]

lol, this is funny. I modified the thread before anyone posted. But what gets me is how many people do not know that there is actually a calculation that has to be done on some submersible pressure gauges (and for those who can't read, this is not the gauge that tells you how much air you have, but the one that tells you how deep you are) when diving at altitude. I wonder if anyone know how to work out the adjusted ambient surface pressure at altitude.

This just show how much education is actually missing in recreational diving. Granted the calc's I have been talking about generally only apply to altitude, but good reason or thought processes should be used while diving and most people should be able to realize these things.


safe diving all

 

[JDog]

Sorry in these parts the SPG is not a depth gage. Maybe in South Africa it is. But it stands for Submersible Pressure Gauge in our neck of the woods,and it is to tell you how much gas you have left in your cylinder. I know what you need now, let me see if I can find it.

 

[JDog]

See this, this is this.

http://www.sierradive.com/Altitude.htm

 

[Walter]

An SPG is not a depth guage. An SPG measures the pressure of the gas in your tank. BTW, I responded before you edited your post. Your original post said SPG.

Correction for depth gauge is:

Altitude 1000 ft correction 1.22 ft (add to the depth gauge reading)
2000/2.37
3000/3.53
4000/4.61
5000/5.7
6000/6.75
7000/7.73
8000/8.72
9000/9.67
10000/10.58

Keep in mind when diving at altitude, you not ony need to correct your analog depth gauge, you need to use altitude tables (or a computer that corrects for altitude) or a sea level equivalent depth table.

 

[jetfixer]

lol, this is funny. I modified the thread before anyone posted.

No you didn't :no

 

[Charlie99]

Correction for depth gauge is:

Altitude 1000 ft correction 1.22 ft (add to the depth gauge reading)
2000/2.37
3000/3.53
4000/4.61
5000/5.7
6000/6.75
7000/7.73
8000/8.72
9000/9.67
10000/10.58

Keep in mind when diving at altitude, you not ony need to correct your analog depth gauge, you need to use altitude tables (or a computer that corrects for altitude) or a sea level equivalent depth table.

The correction depends upon the type of gauge. The above corrections are for the bourdon tube type depth gauge --- the ones where a 10' difference is about the same angular change, whether it is 0 to 10' or 90' to 100'.

Capillary gauges (where 0' to 10' is much bigger angular change than 90' to 100') have a whole different depth correction. IIRC, those corrections end up being identical to the equivalent sea level depth corrections and you can just dive your standard sea level tables using the depths displayed on the capillar gauge.

Digital gauges general don't need an altitude correction, as they automatically rezero themselves.

 

[300bar]

Sorry in these parts the SPG is not a depth gage. Maybe in South Africa it is. But it stands for Submersible Pressure Gauge in our neck of the woods,and it is to tell you how much gas you have left in your cylinder. I know what you need now, let me see if I can find it.

same in this part of the world SPG is a tankpressure gauge

 

[JDog]

.............This just show how much education is actually missing in recreational diving. Granted the calc's I have been talking about generally only apply to altitude, but good reason or thought processes should be used while diving and most people should be able to realize these things.


safe diving all

This just shows that if you ask for what you really want in the first place,you will get it.