Characteristics of the centrifugal purifier are
Capacity—200 gpm at 60°F to 90°F when
purifying JP-5 (fuel temperature);
Feed inlet pressure—9 psi;
Back pressure of the discharged JP-5:
Minimum—25 psi,
Ideal—30 psi,
Maximum—35 psi, and
Bowl speed—4,100 rpm.
Some purifiers are being modified during ship-
yard periods to purify 300 gpm. Consult the technical
manual for operational changes.
Cover Assembly
The cover assembly (fig. 4-27) completely en-
closes the top of the rotating-bowl shell assembly. The
cover hinges to the bowl casing, thus allowing the
cover to be lifted out of the way for disassembly and
cleaning of the bowl. (See figure 4-26.)
The cover hinge, inlet, and outlet assembly func-
tions to allow the cover to be opened without
disconnecting the piping. The stationary part of the
hinge is welded to the bowl casing, The movable part
of the hinge is welded to the cover. A ratchet hook is
provided on the stationary part of the hinge to lock
the cover in the open position. A handle is provided to
unlock the hook so the cover can be closed. Inlet and
outlet piping connects through the hinge to the inlet
and outlet tubes. The piping is stationary, but the
tubes rotate with the cover. A chevron-shaped, oil-re-
sistant rubber seal is installed between the piping
and tubing to prevent leakage. Fuel pressure spreads
the chevron rings to make a tight seal. When fuel
flow is stopped, pressure ceases, and the chevron
seals loosen enough to allow the cover to be rotated to
the open position.
The feed inlet tube and the purified JP-5 dis-
charge tube both connect into the feed tube assembly
at the top of the cover. An oil-resistant seal (0-ring)
prevents leakage of liquids between each tube and
the feed tube assembly. The feed tube assembly
directs feed into the revolving bowl and purified JP-5
out of the bowl.
A seal-water inlet, located between the inlet and
discharge tubes, directs fresh water into the
revolving bowl for use as a seal. A 3/4-inch plug valve
and
Figure 4-27.—Cover assembly.
4-34
