Do Not Allow Crossed Lines to
Defeat Equipment Safety Features
Crossed lines in wall structure piping creates
hazard of 100% Nitrous Oxide delivery to nasal
mask and Oxygen demand valve when Flowmeter
is set for 100% Oxygen resulting in over
sedation.
The initial installation potential problem:
DISS (Diameter Index Safety System) is
modified at tank room wall when 3/8 inch
Nitrous Oxide pipe is increased to 1/2 inch
pipe size. Oxygen pipe remains at the normal
1/2 inch size.
Both Nitrous Oxide and Oxygen piping is
maintained at a common 1/2 inch size
throughout the building walls leading to
operatories.
At gas outlet station, the Oxygen 1/2 inch pipe
is incorrectly decreased down to the DISS 3/8
inch size reserved for Nitrous Oxide lines.
Oxygen is fed into the Nitrous Oxide lines.
At gas outlet station, the common run of 1/2 inch pipe for
Nitrous Oxide is incorrectly allowed to remain at the 1/2 inch
size and is then falsely connected to the DISS 1/2 inch outlet
station. Nitrous Oxide is fed into the Oxygen lines.
Dental flowmeter valve is set for 100% Oxygen only, but will
deliver 100% Nitrous Oxide because of the crossed lines.
A patient will become over sedated and may appear to fall
asleep when the flowmeter is set for 100% Oxygen.
An Oxygen demand valve connected to the resuscitator quick
connect of the Flowmeter will also deliver 100% Nitrous
Oxide because of the crossed lines.
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