Screwed on Flanges
|Where flanges are secured by screwing the
screw thread on the pipes and in the flanges shall be
arranged to end at a point just inside the back of boss
of the flange. After the flange has been screwed on, the
pipe shall be expanded into the flange by a roller expander.
Such screwed and expanded flanges may be used for steam
for a maximum working pressure of 31.5 kg/cm² (450
lbs./sq. in) and a maximum temperature of 399°C (750°F)
and for feed for a maximum pressure of 42 kg/cm²
(600 lbs./sq. in.).