MIL-HDBK-1022A
overfill alarms and alarm breakout operation so fuel facility
operators can take necessary steps to stop pipeline flow.
Provide means of transferring fuel out of breakout tank back
to fuel systems after a breakout event. Conduct a thorough
review with the pipeline operator and perform a transient
surge analysis to determine if surge pressure reduction
methods are required to avoid damage to the pipeline.
g) Provide a means of inbound filtration.
This is
normally a horizontal filter/separator.
4.3.1.3
Special In-Bound Filtration. Where fuel is
transferred to the base fuel system operating tanks from
barges or directly from the supplier (off base) by a pipeline
which handles more than one product, pass the fuel through at
least two filtrations. Align equipment to allow gross
filtration before fine filtration, in the direction of flow.
The initial filtration may be a prefilter or coalescer for
removal of solids or water or both. Prefilters are normally
used for solids removal. A micronic filter is normally used
for removal of fine solids. A cyclonic filter is typically
used if a gross amount of particulates is predicted to be
present. Coalescers are normally used to remove moderate
slugs of water from the fuel. A hay pack coalescer is used to
remove large slugs of water. A two-stage coalescer is
typically used to remove very fine particulates, as well as
some water. The second filtration is by a horizontal
filter/separator placed downstream of the pre-filter. It
removes dirt and free water down to the very low levels
required for aircraft operations. Where the pre-filters have
removable elements such as the micronic filters, provide two
sets of pre-filters in parallel. Provide two sets of
horizontal filter/separators installed in parallel, each
vessel designed to handle 150 percent of normal off-loading
flow rate. Provide each vessel with a feature to
automatically switch the fuel stream to the other vessel when
the differential pressure across the vessel reaches a preset
limit. Require a warning signal to alert the operator that
the switching operation has occurred. In cases of emergency,
include the capability to bypass the inlet filter separator
bank. Avoid the use of water slug valves in pipeline in-bound
filter/separator.
4.3.2
Tank Truck and Tank Car Off-Loading Facilities
67
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