Inspection of tanks

Nicholas von Rosen · 7th June 2007, 09:44

Hi Johnny

Glad that you are OK, - and "nothing" happend....

Nick

vid · 7th June 2007, 12:44

Quote: (Originally Posted by divetheworld)

Link -> How much energy is there in a filled scuba tank

Have read this and it starts with

"Don't store a tank full of air. Store it with 100-200 psi to prevent moiusture from entering?"

So what doe everyone do with their bailout cylinders that never actually get used (hopefully). Ignore the above advice and just check the cylinder once a year (or even less frequently)?

vid

Ant Slegg · 7th June 2007, 12:45

Having just got two cylinders back from their annual O2 inspection both completely empty I am going to get something put in them very soon to avoid any moist air getting in.

Ant S

Nick Bailey · 14th June 2007, 11:04

Last year in the UK a three litre pony exploded during filling, fortunately nobody was hurt. This was also due to internal corrosion.
Please find attached leaflet from work done last year.

Health and Safety
Executive

DIVING CYLINDERS – INTERNAL CORROSION

In 2006 a 3 litre steel pony cylinder exploded during filling. Fortunately no one was injured. The cylinder failed due to extensive internal corrosion weakening the cylinder wall. The cylinder was approximately 2 years old and externally appeared to be in very good condition. Research has shown that corrosion in compressed air and nitrox cylinders can be up to 1000x normal corrosion rates. The amount of water needed to produce this corrosion is very small and might not be enough to be identified by the owner, for example by shaking.

The HSE and the Diving Industry are monitoring feedback from cylinder test stations to identify if reducing the time between cylinder inspections is required. In the meantime divers need to be aware of the serious consequences that can result if water is allowed to enter their cylinders.

Divers should take the following precautions to minimize the chance of water entry:

· Avoid emptying cylinders underwater – if you do, have them internally examined before refilling.

· Do not charge cylinders (such as delayed SMB cylinders) that have been emptied underwater, by decanting from your main cylinder – water from the empty cylinder may enter the “charging cylinder” during the process. If you suspect your inflation cylinder was emptied underwater have it internally examined before filling.

· Before charging a cylinder always momentarily crack open the cylinder valve and supply valve to blow out any moisture.

If you consider there is any chance of water having entered your cylinder have it internally inspected before it is filled.

7th June 2007, 09:44	#11 (permalink)
Nicholas von Rosen Custom Title Allowed! Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Classic Join Date: Jul 2005 Location: Helsingoer, Denmark Posts: 152	Re: Inspection of tanks Hi Johnny Glad that you are OK, - and "nothing" happend.... Nick __________________ NICK
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7th June 2007, 12:44	#12 (permalink)
vid New Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Sport Kiss Join Date: Jan 2006 Location: Surrey, UK Posts: 65	Re: Inspection of tanks Quote: (Originally Posted by divetheworld) Link -> How much energy is there in a filled scuba tank Have read this and it starts with "Don't store a tank full of air. Store it with 100-200 psi to prevent moiusture from entering?" So what doe everyone do with their bailout cylinders that never actually get used (hopefully). Ignore the above advice and just check the cylinder once a year (or even less frequently)? vid __________________ vid
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7th June 2007, 12:45	#13 (permalink)
Ant Slegg Still Learning.... Current Rebreather/s: Ouroboros Other Rebreather/s: Ouroboros Join Date: Nov 2005 Location: Grevenmacher, Luxembourg Posts: 167	Re: Inspection of tanks Having just got two cylinders back from their annual O2 inspection both completely empty I am going to get something put in them very soon to avoid any moist air getting in. Ant S __________________ Ant' S Learning to dive since 1990...
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14th June 2007, 11:04	#14 (permalink)
Nick Bailey New Member Current Rebreather/s: Inspiration Classic Dolphin Other Rebreather/s: Dolphin Join Date: Dec 2005 Location: Buxton Posts: 1	Re: Inspection of tanks Last year in the UK a three litre pony exploded during filling, fortunately nobody was hurt. This was also due to internal corrosion. Please find attached leaflet from work done last year. Health and Safety Executive DIVING CYLINDERS – INTERNAL CORROSION In 2006 a 3 litre steel pony cylinder exploded during filling. Fortunately no one was injured. The cylinder failed due to extensive internal corrosion weakening the cylinder wall. The cylinder was approximately 2 years old and externally appeared to be in very good condition. Research has shown that corrosion in compressed air and nitrox cylinders can be up to 1000x normal corrosion rates. The amount of water needed to produce this corrosion is very small and might not be enough to be identified by the owner, for example by shaking. The HSE and the Diving Industry are monitoring feedback from cylinder test stations to identify if reducing the time between cylinder inspections is required. In the meantime divers need to be aware of the serious consequences that can result if water is allowed to enter their cylinders. Divers should take the following precautions to minimize the chance of water entry: · Avoid emptying cylinders underwater – if you do, have them internally examined before refilling. · Do not charge cylinders (such as delayed SMB cylinders) that have been emptied underwater, by decanting from your main cylinder – water from the empty cylinder may enter the “charging cylinder” during the process. If you suspect your inflation cylinder was emptied underwater have it internally examined before filling. · Before charging a cylinder always momentarily crack open the cylinder valve and supply valve to blow out any moisture. If you consider there is any chance of water having entered your cylinder have it internally inspected before it is filled.
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