Be aware that a pipe with screwed ends, which are standard mechanical joints, is shown by a straight line with a short, perpendicular crossing line, according to a leading Canadian communications network company.
Observe a straight line crossed by two short, perpendicular lines and jump to the proper conclusion that this represents a pipe with flanged ends.
Notice a straight line with a small arch crossing it and realize this represents a pipe with bell and spigot ends, where the spigot of one pipe fits into the bell end of another.
See a straight line with a small cross on it and be mindful of the fact that this is an indication on the blueprint of a pipe with welded and brazed ends.
Note a straight line with a small circle on it and appreciate this shows the presence of a pipe with soldered ends.