Not necessary but probably won't hurt anything.Found a piece of 9” diameter ductile iron scrap about 2’ tall @ 40 lbs, so decided to make an enclosure I can place my HPA bottles in while filling. The tank shown is a 9L, 7.5” diameter.
Good idea or supremely stupid due to bomb effect? If it’s the latter I’m out less than $10, so no big deal.
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Filling tanks submerged is done more to cool the tank than it is for safety. Divers like big fills and if you just air them up dry they will heat up during the fill process and then lose pressure as they cool down.When I used to fill my tanks at Sea Diver's in Ozark, Al. before Mr. George passed, he would fill them submerged in a large tank of water.
At the time my tanks were a 100cf aluminum scuba tank with 3300 psi max fill and an 80cf steel scuba tank with the same max fill. Mr. George took care of the visual and hydro testing of both when needed. He always filled them in the water tank, let them cool and topped them off. It was a 2 hour round trip and I waited while he filled them. At that time I only had 2k fill guns... a Disco and an FD-PCP.Filling tanks submerged is done more to cool the tank than it is for safety. Divers like big fills and if you just air them up dry they will heat up during the fill process and then lose pressure as they cool down.
That'll give a good fill. A lot of divers are just in a hurry to get their tanks filled. Some people don't like having the tanks filled in water because they feel that water might get somehow get into the cylinder, but then they proceed to go underwater with them and somehow that's OK, but filling with most of the tank submerged isn't.At the time my tanks were a 100cf aluminum scuba tank with 3300 psi max fill and an 80cf steel scuba tank with the same max fill. Mr. George took care of the visual and hydro testing of both when needed. He always filled them in the water tank, let them cool and topped them off. It was a 2 hour round trip and I waited while he filled them. At that time I only had 2k fill guns... a Disco and an FD-PCP.
Hmmm... wonder how they feel about having them hydro tested?That'll give a good fill. A lot of divers are just in a hurry to get their tanks filled. Some people don't like having the tanks filled in water because they feel that water might get somehow get into the cylinder, but then they proceed to go underwater with them and somehow that's OK, but filling with most of the tank submerged isn't.