Handling High Pressure Cylinders

5 to 10 minutes

The amount of time it should take to properly fill a 3000 psi (207 bar) cylinder

About 30 minutes

The amount of time it will take someone with a surface air consumption of 20 psi/minute to breathe 2500 psi from a scuba cylinder while diving in 99 feet of seawater

300-600 psi or 20-41 bar

The rate per minute for filling cylinders.

Allows for cascade filling

A series of storage cylinders connected by manifold to produce a desired storage capacity.

_____ require all scientific divers to receive hazardous materials training for handling high pressure cylinders.

AAUS and NOAA scientific diving standards

A single large storage cylinder such as a recycled submarine ballast tank

Can offer the advantage of not requiring periodic hydrostatic testing.

_____ is the most economical use of banked gas.

Cascade filling

Cascade filling

Equalizing the pressure in the cylinder being filled with the pressure in a single cylinder in a series of storage cylinders, moving to the next cylinder in the series and repeating the process until the desired pressure is reached.

ball valve

Is either open or closed

Caution should be taken when using fill panels employing _____ valves, a rapid pressure spike can increase the risk of a fire in the presence of gases with high oxygen content.

ball

It is June 2008; a fill station operator conducting a pre-filling survey of a cylinder finds the hydrostatic test dates of 2 98+ and 10 04. The cylinder has a current VIP sticker, all other required markings, and shows no signs of dents, bulges, scrapes or line corrosion. The fill station operator:

can fill the cylinder, but only to the rated working pressure since the current hydrostatic test mark does not have a +.

Only individuals _____ in the handling and filling of high pressure cylinders should be in the room when cylinders are being filled.

trained

4,500 psi

310 bar

Fill Station Operator has the responsibility to reject cylinders that do not meet standards.

True

Preferably, cylinders should be transported and stored in a secure, upright position.

True

Putting part of your body in the air stream of an open high pressure cylinder valve can lead to embolism.

True

It is November 2008; a fill station operator conducting a pre-filling survey of a cylinder finds the hydrostatic test dates of 2 97 and 10 03. The cylinder has a VIP sticker dated 10/07. It has the stamp 3AL, along with all other required markings, and shows no signs of dents, bulges, scrapes or line corrosion. (Select all that apply)

-The cylinder is "out of hydro"; it has been longer than five years since the last hydrostatic test. -The cylinder does not have a current VIP. -This is an aluminum cylinder. -The fill station operator should not fill this cylinder.

Select all that apply to the valve pictured here:

-This is an example of a Ball valve -This valve is either open or closed providing no means of pressure adjustments

Select all of the items listed that the fill station operator should do before filling a cylinder:

-Verify the cylinder has valid ICC or DOT stampings -Check for a current Hydrostatic Test Stamp -Verify a current visual inspection sticker (within the past year) -Verify the cylinder has a valve with a pressure relief device -Check that there is air/gas in the cylinder -Check the rated pressure of the cylinder -Check the pressure in the cylinder and its contents (air, nitrox, etc.) -Verify the general condition of the cylinder

Safe handling procedures for high pressure cylinders include: (select all that apply)

-Wear shoes when working around cylinders. -Store charged cylinders in an upright position in a cool shady place and away from flammable materials. -Cylinders that appear to be damaged by fire or physical abuse should be removed from service. -Scuba cylinders should receive a visual inspection by a qualified inspector annually. -Internal inspections, hydrostatic tests, and repair work should be performed only by trained technicians.

metering valve

Provides for slow and controlled pressure adjustments

The codes 3AA 2250 PST 4~08+ stamped into the neck of a cylinder indicate:

This is a steel cylinder with a rated working pressure of 2250 psi, manufactured by Pressed Steel, hydrostatically tested in April of 2008, and capable of being over filled by 10%.

DOT regulations found in 49 CFR 172.700 mandate training requirements for employees of companies involved in commerce who handle compressed gas cylinders.

True