
63Oxygen Production
backup can be added. This typically consists of an HP
liquid tank running at a pressure just above pipeline
pressure. On loss of product pipeline pressure, oxy-
gen is automatically introduced into the line from the
instantaneous backup system. Typically a 30min to 1h
supply of available liquid is necessary. For a smaller
plant, all the liquid backup could be stored at high
pressure.
The LP storage tank is typically designed to provide
24 h of product backup. To ll or maintain level will
incur a refrigeration penalty. As discussed in 3.2.1, this
refrigeration penalty can be offset by producing liquid
at periods of low o ...