Some of the most commonly used plain-band
couplings are shown in figure 2-13. When you install
a hose between two duct sections, the gap between the
duct ends should be a minimum of 1/8 of an inch and
a maximum of 3/4 of an inch. When you install the
clamps on the connection, the clamp should be 1/4 of
an inch from the end of the connector. Misalignment
between the ducting ends should not exceed 1/8 of an
inch.
Marman clamps are commonly used in ducting
systems and should be tightened to the torque value
indicated on the coupling. Tighten all couplings in
the manner and to the torque value specified on the
clamp or in the applicable maintenance instruction
manual.
When you install flexible couplings, such as the
one shown in figure 2-14, the following steps are
recommended to assure proper security:
1. Fold back half of the sleeve seal and slip it
onto the sleeve.
Figure 2-13.—Flexible line connectors.
2-10
