Page 113 - CITS - Welder - Trade Theory
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WELDER - CITS
Development drawing for pipe Branch “Y” joint
Objectives : At the end of this lesson you shall be able to
• develop and able to layout the pattern for “Y” joint pipes intersecting at 120°
• develop and layout the pattern for “Y” joint pipes branching at 90°.
Development of ‘Y’ joint branching at 90°:
Three cylindrical pipes of X, Y, Z form a ‘Y’ piece. (Fig 2) Draw the lateral surface development of each pipe.
In the three pipes XYZ, Y & Z are similar in size and shape, hence their developments are also similar.
• Draw the development of pipe ‘X’ as in the previous exercise.
• Draw the elevation and plan of pipe ‘Y’ as shown.
• Divide the plan circle into 16 equal parts.
• Project the points to the elevation.
• Draw the rectangle ABCD in which AB is equal to D.
• Draw the development of pipe Y as shown in Fig.
100
CITS : C G & M - Welder - Lesson 14-26
