Yelled at for MOF

[Doc]

...the signs of panic in a diver are subtle and not always a big splashing motion and cries of "pizza!! pizza!!"

The first time I heard that was the same day I discovered the 3 mins @ 15' rule. It was the same week I offered to drown "the Commander".

 

[Insta-Gator]

Sounds like that instructor is wound a little too tight and probably should seek a less stressful activity.

 

[Dan]

Vintage gear, I wouldn't disagree.
Except that the pressure relief valve is built into the back of every SPG I have seen in my short scuba career using new-ish rental gear. As an engineer with no dive experience I knew that the little hole in the back of the console was there to either let something in or out. So now if you point the face of the SPG away from you, you have pointed the part designed to break, right at yourself. Do I think equipment can break? Yes. Do I want to point the part that is actually designed to break towards my body or my face? Nope.

If a quasi modern SPG is blowing their faces off instead of blowing the over-pressure relief, a lawyer with a modicum of skill could retire very quickly.

I also had this question pop into my head while on the dive boat in PCB. How in hades does anyone pressurize anything without somebody pointing something at someone?

My Highland 2" Thin Line SPG has no pinhole, just solid metal backplate & plastic cover.

 

[tbone1004]

My Highland 2" Thin Line SPG has no pinhole, just solid metal backplate & plastic cover.

take a picture of the back. It's on there somewhere. It usually looks like a button in the middle of the gauge

 

[txgoose]

My Highland 2" Thin Line SPG has no pinhole, just solid metal backplate & plastic cover.

According to Amazon (difficult to read, admittedly) it is in there somewhere. The scuba training could more accurately say, "Know where your pressure relief valve is and point it elsewhere." Not sure where yours is. Would probably be good info to have though.

Product description
Ready to mount directly to high pressure hose Airspool with Viton o-rings included Luminescent gauge face Wide 270º sweep from 0 to 5000 psi Available in psi or bar Easy reading high-contrast black face Built-in over pressure relief for safety HP hose is not included Manufactured in Italy

 

[daduls]

I'll simply repeat what several posters have already said, use 'Good Common Sense'.

If you don't have that you should not have a mask to put on your forehead...

 

[Dan]

take a picture of the back. It's on there somewhere. It usually looks like a button in the middle of the gauge

Obviously you haven't seen / own one of this little gadget. I'm an engineer too and I have seen plenty pressure gauges in the plant, some of them have the holes plugged with rubber buttons to prevent internal corrosion from salty air in the coastal region. However, those gauges are mostly for above water environment. In underwater environment, especially saltwater, you don't want any pin hole to allow entry for corrosive environment (salt water) to corrode the internals, even though it's just a simple Bourdon tube.

Below is the view from the front. When I'm home, I'll take a picture of the back and posted here.

 

[FinnMom]

Even he had been absolutely correct, he approached the matter in a manner guaranteed to accomplish absolutely nothing positive. But you should feel sorry for him: personality faults that bad are usually incureable. Light a candle for him and be glad you have the freedom to be sensible, constructive and play well with others.

 

[tbone1004]

Obviously you haven't seen / own one of this little gadget. I'm an engineer too and I have seen plenty pressure gauges in the plant, some of them have the holes plugged with rubber buttons to prevent internal corrosion from salty air in the coastal region. However, those gauges are mostly for above water environment. In underwater environment, especially saltwater, you don't want any pin hole to allow entry for corrosive environment (salt water) to corrode the internals, even though it's just a simple Bourdon tube.

Below is the view from the front. When I'm home, I'll take a picture of the back and posted here.

View attachment 428187

I've got probably a half dozen of those slimline gauges and pretty sure mine all have opv's on them.

these are the larger brass and glass gauges, but you can clearly see the OPV there. I'll check the slim ones when I get home

 

[Lorenzoid]

Just saw this thread. I had no idea "MOF" was such a controversial topic. I think I was taught it may be one sign of distress to look out for, but I don't recall being taught that it's commonly used as a distress signal.

Your reaction was spot on. Baffling, but, as you put it, "his pool, his rules."