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THREADED FLANGES are confined to special applications.
Their chief merit lies in the fact that they can be assembled without welding
this explains their use in extremely high pressure services, particularly at or
near atmospheric temperature, where alloy steel is essential for strength and where
the necessary post weld heat treatment is impractical. Threaded flanges are unsuited
for conditions involving temperature or bending stresses of any magnitude, particularly
under cyclic conditions, where leakage through the threads may occur in relatively few
cycles of heating or stress; sea welding is sometimes employed to overcome this, but
cannot be considered as entirely satisfactory.
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