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Link to US Geological Survey
Coastal and Marine Geology Program
Woods Hole Field Center

Geochemical Sediment Analysis Procedures, Open-File Report 02-371



Materials Required:
  • Full Gas Cylinder
  • Wrench
  • Leak Detection Compound
  • Gas Regulator
Changing the gas tank

Turn off the gas (clockwise) using the main silver valve and purge the gas to let the gas lines all bleed out until both pounds per square inch (psi) readings are zero - takes a few seconds.

Turn tank ON/OFF with main silver valve; link to larger image

Use wrench to loosen nut and remove the regulator - be careful not to bend the copper connection wire.

Carefully roll away the spent cylinder and roll in the full cylinder - replace cap to spent cylinder and order new cylinders as needed.
*Use Extreme Caution when moving cylinders and be sure to secure them tightly with chain or strap to cylinder rack.

Replace the regulator on the new cylinder and tighten nut with wrench - do NOT use teflon tape.

Use wrench to loosen regulator; link to larger image

Check for leaks around the regulator connection using Leak Detection Compound - if you see bubbles there is a leak and the regulator should be tightened.

Turn the gas on (counter clockwise) using the main silver valve.

Checking for leaks

Clean out the gas lines using the following procedure:

Close the blue regulator valve (shown in this photo).
Open the main silver valve (air will fill up in the regulator).
Close the main silver valve (no more air can come from the tank).
Open the blue regulator valve.
Let the line bleed until the psi is zero.

Repeat this process five times - for CHN, you should set Helium purge for 300 seconds and repeat during purge.

Close blue valve on left fo regulator; link to larger image

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