
Chapter - 3
MNL000442.doc
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09/19/2016
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3
Compression Fitting
Grips OD of Tube
Nut
1/4”or 3/8” TOD Gas Line
Continuous (Passes Through
Bulkhead)
Cabinet Top
Figure 3.1:
Standard Bulkhead
The coaxial bulkhead permits a single process out line to penetrate the enclosure,
while providing an acceptable seal for enclosure ventilation purposes. In addition,
the coaxial bulkhead provides a termination point for an outer secondary
containment tube. The outer secondary containment tube, or jacket, is connected
directly to the coaxial bulkhead. The outer secondary containment continues
through the coaxial bulkhead and terminates as a branch on the coaxial bulkhead
inside the enclosure. This branch on the outer secondary containment may remain
open, be dead ended, or be pressurized with inert gas, depending on the method
chosen to monitor the secondary containment tube for leaks.
Two methods of monitoring are typically used: gas detection or pressure decay of
the annular space. An open or vented annular space is monitored at the open end