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What is the proper way to install a valve into a scuba tank?

I bought a scuba tank for airgun filling purposes. Will not be used as a breathing aparatus. If it just needs some sort of anti-sieze and a proper torqueing, I can do that. Since the tank will be empty they may want to do a VIP anyway correct? Therefore should install the valve for me.

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Any preesurised gas container should be visually inspected annually (at least) and pressure tested every 5 years, 3 years or annually according to local law. If you are going to have it tested, screw the valve in loosely as they will need to examine the threads on it in order to pass the tank and valve as a unit. BUT ALL THAT ASIDE, the answer to your original question is: Replace the tank neck O-ring, very lightly lube the threads of the valve with a SCUBA silicon grease, wind the valve in to finger tight (if you have a torque wrench you could find out setting) if no torque wrench, nip the valve tight with a light tap from a rubber mallet on a 12" wrench (I know it is a bit approximate, but the O-ring makes the seal, not the tightness)

Posted on Dec 01, 2008

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1 Answer

Slow leak at the reg.


This may be an issue with the breathing resistance being set too mild to activate the control valve within the second stage. A trained techician would be able to make the adjustment easily/quickly.

Feb 10, 2010 | Spare Air Scuba Diving & Snorkeling

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Why do they put the scuba tank in water while refilling it??


A scuba tank is design to hold a certain volume of air, at a particular at a particular temperature. In the US, the standard tank is an aluminum 80 CF tank. At room temperature and 3,000 psi, the tank holds 72 CF of air (yeah, I know they round up calling it 80 CF tank). When you are filling the tank, the air and tank will become warm/hot. If you check the pressure guage while the tank is warm, it will give you a reading of X. Once the tank cools, it will give you a reading that is less than X. They put the tanks in the water in the hopes of keeping the temperature do, and filling the tanks closer to the design pressure and temperature. Some examples that you can see... In Mexico, many of the tanks will be sitting in the sun while on the boat. The tank may have a reading of 3,200 psi. Once you jump in the water, and the tank cools down, the new reading may be 2,800 psi without ever breathing any of the air. I have been ice diving, the tank was acutally colder than the water. Since the water temperature was warmer than the tank, me pressure reading was slightly higher.

Dec 01, 2008 | Aeris Atmos Lx BC

1 Answer

What is the maximum time you can get out of a scuba tank?


There are four main variables affecting this: 1. The (total) internal volume of the tank(s) 2. The pressure to which that tank has been filled 3. The ambient pressure at depth 4. The rate at which the diver uses the air out of that tank for their breathing and buoyancy control (including drysuit inflation). The first three are simply a matter of physics and will be the same for everyone under the same circumstances. The major variation comes from the last one, which is usually a function of the diver's experience/ competence (not the same thing!). One who is less so will go through air quicker than one who is more so. So the best answer for your question is "It depends..."! However, many resorts and guides set a maximum dive time of one hour, so they know when to expect a diver back on the boat (or, when they have to call out the Coastguard!). This might be the source of your friend's assertion. FYI: The current world record for breathing off a single tank of air while sitting at the bottom of a swimming pool is a little bit short of 8 hours. The divers in question were using 12-litre cylinders charged to 200B and breathing verrrry slowly! (approximately 12 x 200 litres / 460 minutes = 5.22 l/min)

Dec 01, 2008 | Aeris Atmos Lx BC

3 Answers

Why do scuba diving pressure gauges reach 5000 psi if a tank may only be filled to a max of around 3200?


Scuba tanks can be filled well past 3200psi. When they do a hydrostatic test it is well beyond any pressure that any dive shop will fill a tank to. The highest I've seen the pressure get in my tank is 4000 and that is when the filler at the dive shop forgot about it.

Dec 01, 2008 | Aeris Max Depth Analog 2 Gauge Console

1 Answer

Scuba octopus?


An octo IS a regulator. There are two types or regulators on a typical scuba rig. Your first stage reg that is attached to your tank valve. From this first stage, there are hoses leading to your primary breathing second stage reg and your Octo second stage. The job of the first stage is to bring that possibly 3,000 psi air in the tank, down to a more reasonable pressure of about 150 psi. From there, the air goes to the second stages and can be reduced down further by these second stage, on demand (meaning it delivers air when you inhale and stops when you finnish inhaling), regs. The Octo is a second stage back up for a buddy that is out of air or if your own primary second stage ( the one you normally breathe from) is no longer functioning. Octos are generally ( not always) a cheaper reg, that may not have all the bells and whistles that a primary air source does. It's there for an emergency, so ease of breathing under load and tuning adjustments are minor. It gives you air when you're in a pinch, thats the important thing.

Dec 01, 2008 | Aeris A1 Octo

1 Answer

Guidelines to Scuba Regulator Purchase


The scuba regulator is employed in an open-circuit scuba set. Said scuba equipment reduces high air pressure conveyed by the diving cylinder to the first stage and feeds breathable gas to the diver through the second stage's mouthpiece. Also called pressure regulator or demand regulator, the scuba equipment is one of the essentials to diving that determines breathing quality and inhalation effort during the dive. But given the different types of regulators and the pertinent design of its first and second stage components, how should a neophyte diver - or even a seasoned diver at that, choose a scuba regulator that incorporates user adjustment and delivers a venturi-assisted air flow in its features? Consider your diving purpose and frequency. Better yet, take note of the following criteria to guide you in your purchase: 1. The Scuba Regulator's Mouthpiece. Check the specifications if the regulator is outfitted with a patented orthodontic mouthpiece. This implies that it is ergonomically-designed to accommodate an overbite or underbite by the human mouth. An ergonomic mouthpiece helps reduce fatigue in the mouth and jaw area, particularly in the cruise of lower depths and extended dives. 2. User Adjustment Settings. There are optimally-designed scuba regulators that are outfitted with adjustment levers to therefore allow divers to finetune valve settings in order to provide the least possible inhalation effort throughout the dive. One notable scuba equipment is the Aeris AT 400 Pro Regulator that is equipped with an adjustable second stage. 3. Weight of the Scuba Regulator. Visualize yourself on a dive and using just any other type of scuba regulator. Is the regulator bulky to considerably increase drag and cause jaw fatigue or is it buoyant enough for you to carry around with your mouth? Lightweight scuba regulators use polycarbonate thermoplastics for its housing to make the scuba equipment compact, sturdy and corrosion-resistant that makes them fit for extended use. 4. Nitrox Compatibility. This entails an ocular inspection of the cylinder tank (Nitrogen and Oxygen proportions) and scuba regulator (Nitrox compatibility) specifications. As a matter of convention, most regulators are suited for nitrox mixture use out of the box; containing the standard, maximum proportion of 40% Oxygen (in terms of volume) but then again, there are gas mixes supporting leaner proportions of oxygen such as the trimix. Therefore, check if the scuba regulator supports the gas mixture configured for your diving cylinder prior to purchase. 5. No-Contaminant Feature. As much as possible, choose a diving regulator that has been manufactured using Dry Valve Technology (DVT). DVT operates through an automatic valve that prevents contamination of the first stage mechanism to thus prevent regulator flooding and the entry of moisture or dust particles. This likely improves scuba regulator performance and extends its useful life. 6. Air-Sharing Feature. This feature often associated with octopus regulators (used as a spare demand valve or alternate second stage) will prove to be most helpful during diving emergencies such as a free flow or during diver rescues. High performance octopus regulators such as the Aeris Gyro Octopus Regulator are designed lightweight and with air-sharing feature, while sporting an inline swivel for convenience mounting and flexibility

Dec 01, 2008 | ACCO Brands Apollo Bio-Filter Moisture...

1 Answer

Scuba Tank Safety


"There is only one bit of advice you need when you own your own tanks: bring them to a professional for filling and regular inspection. Tanks are required to be visually inspected once a year, which involves removing the valve and looking inside for signs of corrosion or damage. If the tank is deemed safe, an Evidence of Inspection (EOI) sticker is applied to the tank showing the date of inspection. A hydrostatic test is required every 5 years, which determines the tank's ability to contain pressurized gas. A certified hydro test facility will stamp the shoulder of the tank below the valve with the date of pass. This inspection makes it easy for you to know if your rented tank has been properly maintained and inspected. If the hydro test stamp is more than 5 years old or the EOI sticker is more than a year old, don't accept the tank. Corrosion is the major culprit in tank degradation. Scuba tanks are filled with very dry air, to prevent moisture from rusting the interior of the tank. That is why certified divers learn never to leave a tank empty. Always leave at least 100psi of pressure in the tank at the end of your dive, so no moisture can get in when valves are opened."

Dec 01, 2008 | Aeris Atmos Lx BC

1 Answer

Scuba tank maintenance


"The scuba tank is one of the most important pieces of dive equipment. It must be looked after. A well-maintained tank could give 20 or 30 years service. A neglected tank can fail with the force of a hand grenade. It pays to care for a scuba tank, not only for economy, but also for safety and diving enjoyment. The following ten tips can help ensure a scuba diving tank will provide many years of faithful diving service. 1) Never completely empty a scuba tank. Always leave at least 1000 kPa to ensure moisture doesn’t enter. 2) Always rinse the scuba tank and valve in fresh water after use. 3) If the scuba tank is to be stored for a few months, drain the air down to around 1000 kPa. This is to decrease the amount of oxygen that can cause corrosion. 4) A scuba tank should be stored standing up out of direct sunlight. 5) A scuba tank should be carried with care and attention. They shouldn’t be carried on the shoulder as a fall can lead to the valve getting smashed off and the tank taking off like a rocket. 6) A scuba tank should be regularly tested in accordance with statutory regulations. 7) A scuba tank should not be left in a closed car in the heat of the day. It can heat up and explode or the burst disk can rupture; both scenarios leading to damage to the car. When in the car the tank should be carried with the valve towards the back. If the car brakes suddenly the tank valve won’t be damaged as the tank moves forward with its momentum. 8) The scuba tank valve should not be turned off too tightly. It only has to be just nipped closed enough to stop the air flow. 9) A scuba tank should be filled with clean, dry air. Any discolouration around the air outlet or bad odour should be treated with suspicion. If there are any doubts that a tank has been filled with bad air, it should not be used for scuba diving and should be checked immediately. A bad fill can lead to damage to the tank, as well as pose a threat to a diver. 10) If painting a tank, ensure no heat curing paints or strippers are used as these could affect the strength of the tank."

Dec 01, 2008 | Aeris Atmos Lx BC

1 Answer

Safe second?


"The second stage regulator takes the manageable pressure coming from the 1st stage through the hose and delivers it to your mouthpiece in a way that is comfortable to breathe. Where the 1st stage is only concerned with letting air flow into the hose the 2nd stage has more complex machinery which handles both inhaling and exhaling through the same mouthpiece. Like the first stage the 2nd stage scuba regulator uses a diaphragm or piston to open a valve. Breathing in from the mouthpiece reduces the air pressure inside the chamber, water pressure pushes the diaphragm in, which opens the intake valve. When you stop inhaling the pressure in the chamber balances and the valve closes. The result is an air delivery system which supplies air only when you are inhaling and does not leak air constantly through the mouthpiece. A well balanced and well-maintained scuba regulator does its job so well that breathing feels natural and effortless despite the all mechanics involved. The second stage scuba regulator also has a purge or exhaust valve, which lets your exhaled air out of the chamber, but doesn't let water in. When you exhale into the second stage scuba regulator the pressure inside the chamber becomes greater than the ambient pressure. The exhaust valve is a simple one-way valve which lets this air escape. The second stage scuba regulator also has a purge or exhaust valve, which lets your exhaled air out of the chamber, but doesn't let water in. When you exhale into the second stage scuba regulator the pressure inside the chamber becomes greater than the ambient pressure. The exhaust valve is a simple one-way valve which lets this air escape. A second stage scuba regulator also has an ""emergency"" or ""purge"" button which forces the intake valve to open. When the purge button is pressed air will flow continuously into the chamber and escape either through the mouthpiece or the aforementioned exhaust valve"

Dec 01, 2008 | Aeris A1 Octo

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