The chart is designed with columns and a row with calculated values for, (B) take offs, (C) offsets, (D) center to end and end to end dimensions on both sides of the templates as shown in above sketches. All dimensions to be used for standard ninety degree weld elbow, with std.wall, sch.40, sch.60, sch.80, XS. XXS. sch.120, sch.160, etc. etc., for odd degree fittings listed in column (A)
Column (A), dimensions on one side of template to be used with “two” odd degree fittings back to back and the other side of template Column (A) dimensions to be used with “one” odd fitting attached to a long radius ninety degree standard elbow.
EXAMPLE: In reference to above odd fitting back to back sketch, and using above graph, 18” pipe size with a 0.132 offset, listed in column (C) two 4 degree fittings listed in column (A) is needed to obtain offset. Dimension given 0.943 in column (B) is actual dimension for take-off of the 4 degree odd fitting and the dimension given 3.767 in column (D) is actual end to end dimension of the two 4 degree fittings back to back.
NOTE: All given dimensions are fitting to fitting with no gap allowance
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