Pocket Guide to Flan..

2
ANSI
BUTTWELD
FITTINGS
ANSI buttweld fittings are used to change direction or
join parts of a piping system. Mastering the names of the
various shapes is not too difficult, because the number
of shapes is limited.
Figure 2-1 shows the identification markings that are
required on all fittings. The 90-degree long radius elbow
is marked with the size and schedule number, the mate-
rial grade, and the heat code symbol, also known as the
laboratory control number.
Elbows
Types of Buttweld Fittings
The elbow is the most commonly used fitting, and the
long radius elbow is probably the most commonly used
elbow. The short radius elbow is used in systems with
tight spaces, such as offshore and skid units.
Figure 2-2 shows the 90-degree long radius elbow next
to a 90-degree short radius elbow. Remember that a 90-
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