MIL-HDBK-1005/7A
f) Provide metallic tracer tape or wire over
nonmetallic lines.
g) Pipes suspended above ground or on structural
supports should be anchored to withstand thrust, seismic, wind
velocities and other forces as specified in MIL-HDBK-1002 series
dealing with loads.
7.1.5
Joints
7.1.5.1
Ductile Iron Pipe Joints. As specified in AWWA
C110/A21.10, Ductile Iron and Gray-Iron Fittings, and AWWA
C111/A21.11, Rubber Gasket joints for Ductile Iron Pressure Pipe
and Fittings , with the following recommendations:
a)
The push -on joint is recommended for general use.
b) The mechanical joint should be used in soft soils
where settlement is anticipated, or where flexibility is
required, for seismic design.
c) The ball joint may be used for river crossings and
other installations requiring large joint deflections.
d) Flanged joints should be used where valves,
fittings, and accessories are to be attached to pipes, in
vaults, pits, and above ground locations where rigidity is
required.
e) Sleeve-type mechanical couplings are useful where
greater deflection is needed, where alignment problems may
arise, and for connecting cast iron pipe to other pipe
materials.
f) Clamp-type mechanical couplings are allowed as an
optional jointing method to flanged joints except on pump
suction lines; the pipe must be grooved or shouldered to accept
this coupling.
g) Where the line must be maintained as an electrical
conductor for cathodic protection use a cable bond conductor on
both push-on-joints and mechanical joint pie. For electrical
thawing use serrated silicon bronze wedges for push-on-joints.
90
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