end of the figure eight blind. Turning it the other way causes the
holder to grip the blind tightly. Maintenance involves coating the
exposed half of the figure eight blind with a thin film of motor oil
every 3 months and inspecting the packing rings in the grooves of the
figure eight blind every 6 months for wear. If the packing rings are
worn they must be replaced. Grease fittings on the hand wheel must be
regularly lubricated.
Spool Pieces - Spool pieces are short sections of pipe into which figure
eight blinds are inserted.
Line Strainers - Line strainers catch debris in fuel as it comes down
through a basket or strainer and then passes through the discharge side.
The basket has a wire-mesh or screen which catches the debris and
prevents it from continuing to flow downstream and damaging things like
pump impeller blades and meters. The baskets or screens need to be
pulled from the devices in which they are installed on a periodic
schedule (once a week) to remove the debris.
Line strainers are found
on the suction side of pumps and meters and on the discharge side of
filter separators.
PART C - FITTINGS AND PIPE REPAIR ACCESSORIES
Fittings.
Standard, groove-type fittings include elbows, tees, and
reducers such as the following:
Standard Tee Fittings - Standard tee fittings provide a splitting of
the fuel stream. These fittings have a characteristic "T" shape.
Reducing Tee Fittings - Reducing tee fittings allow reduction in one
leg of the branch, either through the tee portion or through the
branch portion of the tee.
Elbow Fittings - Provide for the change in the pipeline direction by
45 or 90 degrees.
Reducers - Provide a connection from one diameter of pipe to some
smaller diameter of pipe.
Repair clamps.
Listed below are some of the more common types of clamps
used to repair leaking pipelines.
Pit Leak Clamps - Pit leak clamps are designed to temporarily repair a
leak caused by a small hole such as a pit.
Split Leak Clamps - Split leak clamps are designed to temporarily
repair a leak caused by a split pipe. This clamp is limited in the
size of the split which can be repaired due to its limited length.
Over-Coupling Leak Clamps - Over-coupling leak clamps are designed for
placement over the regular split-ring, groove-type coupling when a
leak develops from the initial coupling.
A pipeline leakage report will be completed for all leaks occurring in
a pipeline.
PART D - PUMPS
Pipeline pumps consist of one or more impellers mounted on a rapidly
rotating shaft. Liquid enters the impeller at its center and is impelled
12-91
QM 5099
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