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The design
engineer shall specify the acceptable type of joints in consideration
of the operating and testing conditions.
For example the bell and spigot joint with 2 O-Ring gaskets, that
can be hydro-tested by pressurizing the chamber between the O-Rings
is a valid alternative to hydro-testing short sections (300-500
m) of the pipeline leaving the joints uncovered for inspection.
For lines
with many changes in directions the same joint can be supplied
with the locking key and the anchor blocks can be avoided.
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1.Test
joint
2.Bell
3.Spigot
4.Ring(SBR)
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