Taylor-Wharton RS-234 - Manual (Page 14)

13
preventing radiated heat from entering the inner container. Unfortunately, the perfect vacuum cannot be achieved
since trace gas molecules begin to enter the vacuum space from the moment of manufacture. The vacuum
maintenance system consists of materials that gather trace gas molecules from the vacuum space. The maintenance
system can perform its function for years, however it has a limited capacity. When the vacuum maintenance system
becomes saturated it can no longer maintain the vacuum integrity of the container. The change will be very gradual
and may go unnoticed for several years. When the vacuum in the insulation space is no longer effective, the following
symptoms may appear:
1.
With liquid in the container, the outer casing will be much colder than comparative containers.
2.
Frost, indicating the liquid level, may be visible on the outer casing of the container.
3.
Condensation may form on the container. Note that some icing or condensation is normal around the
piping connections of the vessel. Condensation may also occur on the vessel outer surface as a result of
high humidity.
4.
The relief valve will open continuously until the container is empty.
If it has been determined that the vessel has a vacuum problem it will be necessary to repair and re-evacuate the vessel.
A skilled service technician should perform vessel repair. Contact Taylor-Wharton customer service at 1-800-898-
2657 for assistance in locating the closest service center.