SPG Blow Out - Brass or Steel / Plastic or Glass.

[DevonDiver]

Here is the reality of HP versus IP hose failures:

 

[DogDiver]

Take a walk through peacock springs watching cave divers gear up. You won't see any low quality plastic SPG's around.


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[wedivebc]

Take a walk through peacock springs watching cave divers gear up. You won't see any low quality plastic SPG's around.


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I love people who answer questions with "because I seen other people do it"

Thanks for your valued opinion.

 

[Lorenzoid]

So, does anyone have any reasoned explanation why they believe so-called brass-and-glass SPG is superior to an SPG with a plastic housing? I switched to a brass-and-glass SPG when I decided to venture into DIR, but I have yet to hear a persuasive reason why it's superior to a standard plastic-cased SPG. Seems to me that each has its pros and cons. I don't know what plastic an SPG case is typically made of (ABS maybe?), but it seems pretty tough to me. And is the entire case really plastic, or is there actually a metal case inside the plastic boot?

 

[wedivebc]

So, does anyone have any reasoned explanation why they believe so-called brass-and-glass SPG is superior to an SPG with a plastic housing? I switched to a brass-and-glass SPG when I decided to venture into DIR, but I have yet to hear a persuasive reason why it's superior to a standard plastic-cased SPG. Seems to me that each has its pros and cons. I don't know what plastic an SPG case is typically made of (ABS maybe?), but it seems pretty tough to me. And is the entire case really plastic, or is there actually a metal case inside the plastic boot?

I don't buy the implosion hazard argument. I've had one of the plastic ones to 400ft without issue.
I guess if your buoyancy sucks a guy could make an argument about scratched faceplate

 

[PfcAJ]

I've had friends that have been on dives with plastic spgs that stuck due to depth. I've personally seen one crack at the fitting. They're simply less robust, and given a choice, I'd use a metal one. They are, however, moderately handy for stage regs in effort to make the bottle lighter. I choose a compromise with the smaller metal SPGs, personally.

 

[Lorenzoid]

I've had friends that have been on dives with plastic spgs that stuck due to depth. I've personally seen one crack at the fitting. They're simply less robust, and given a choice, I'd use a metal one. They are, however, moderately handy for stage regs in effort to make the bottle lighter. I choose a compromise with the smaller metal SPGs, personally.

Yeah, I suppose. Maybe for people who subject their gear to a lot of hard use, deep dives, etc., it could make a difference (though I have to wonder if susceptibility to glass breakage is a tradeoff). After all, what divers call a brass-and-glass gauge is of the same general construction as the kind of gauges commonly used in industrial applications. They've proven themselves in industrial settings for decades.

 

[Nemrod]

The plastic faces are actually Plexiglass/acrylic. They are very tough and in proper thickness, superior to glass in strength. Some of the new thin spgs are actually brass case and acrylic lens. Even many Rolex watches (and other dive watches and instruments) have had acrylic lenses. Yes they scratch, the scratches are mostly not seen in the water since the refractive index of the acrylic is similar to that of the water.

N