MIL-HDBK-1022A
6.5.5
Pigging Equipment. Equip all pipelines with outlets
to allow the connection of pig launchers and traps. Design
the outlets so that they can accommodate internal
nondestructive inspection trains. Provide sufficient
curvature of bends in the pipeline to permit free passage for
such equipment. Consider the installation of tees with
internal guide bars at branch connections.
6.5.6
Pumps. Primary pumping facilities are discussed in
Section 3 of this handbook. If multiple pump stations are
required to keep pipeline pressure within safe limits, provide
them at appropriate locations. Section 3 also provides
guidance for those pumping facilities.
6.5.7
Sampling Connections. Provide connections for
sampling fuels on each section of a fuel transfer piping
system. Install sampling and testing connections at receiving
points, tank outlets, inlet and outlet sides of
filter/separators and fuel monitors, fuel dispensing points,
and between block valves so that remaining fuel in each
portion of a fuel transfer pipeline can be sampled. Where
possible, install sampling connections in vertical runs.
Provide a 1/4-inch (6 mm) diameter sample point with a probe,
ball valve, and quick disconnect with dust cap.
6.6
SPECIAL CALCULATIONS. Calculate pipeline
filling/venting times and draining/stripping times. The
larger and the longer the pipeline, the greater the volume of
fuel required to fill the line and, therefore, the greater the
volume of air required to be vented. Undersized vent lines
will delay filling the lines and delay changeover of products
in multiproduct lines. Size vent lines to allow filling of
the line at not more than four times the design transit time
of the line. Connect vent line to the drain line to avoid
spills to the environment. Check vent line air velocity,
which must not exceed the allowable air velocity to avoid
electrostatic buildup, in accordance with API RP 2003. Vent
rate must be not less than the lowest allowable pumping rate
from ship or shore. Vent rate must be less than the design
transit velocity to minimize hydraulic shock.
117
Previous Page
