Local Union 293
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Round Tee Layout
Round Tee Layout I
Round Tee Layout II
Round Elbow
Round Elbow I
Round Elbow II
Round Taper Level 1
Round Taper I
Round Taper II
Round Taper Level 2
Round Taper III
Round Taper IV
Roof Jack Taper
Offset Square to Round
Rectangular transitions
Transition Slant Length
Pythagorem Thorem
Gutters & Ventilators
Gutters & Ventilators I
Gutters & Ventilators II
Gutters & Ventilators III
Gutters & Ventilators V
Gutters & Ventilators VI
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Round Tee Layout I
90° tee with equal diameters
Both pipe and tee are same size
Comprised of tee and hole patterns
Often used in low-velocity systems
Allowances for connections vary
Round Tee Layout II
90° tee with equal diameters
Both pipe and tee are same size
Comprised of tee and hole patterns
Often used in low-velocity systems
Allowances for connections vary
Round Elbow I
Three Piece Round Elbow
Comprised of three gores
Formed using heel and throat radius
Number of spaces can be calculated
Round Elbow II
Three Piece Round Elbow
Comprised of three gores
Formed using heel and throat radius
Number of spaces can be calculated
Round Taper I
Round centered taper on a pitch
Part of a center taper
Sides have equal slants
True lengths found by rotating planes
Developed using radial-line layout
Round Taper II
Round centered taper on a pitch
Part of a center taper
Sides have equal slants
True lengths found by rotating planes
Developed using radial-line layout
Round Taper III
Round centered taper on a pitch
Part of a center taper
Sides have equal slants
True lengths found by rotating planes
Developed using radial-line layout
Round Taper IV
Round centered taper on a pitch
Part of a center taper
Sides have equal slants
True lengths found by rotating planes
Developed using radial-line layout
Roof Jack Taper
Unequal-tapered roof jack
Hole for the roof jack is circular
Jack pattern no longer equally slanted taper
Developed by triangulation or advanced methods
Offset Square to Round
Offset square-to-rounds
Square- or rectangular-to-round
One-way or two-way offsets
Developed using triangulation
Shortcut methods
Math
Transition Slant Length
Fittings are rectangular or square
Two-piece, four-piece, centered, or offset
Developed using triangulation
Math
Pythagorean Theorem
Four sides taper equally
All four patterns are the same
Can calculate the side centerline mathematically
Gutters & Ventalators I
Gutter pattern
Various shapes and styles
Application determines size
Developed with parallel-line method
Gutters & Ventalators II
Gutter miter layout
Profile
Plan View
Gutters & Ventalators III
Conductor-head patterns
Part of drainage system
Developed with parallel-line method
Gutters & Ventalators V
China-cap pattern
Round ventilator cap
Used in low-velocity systems
Developed using radial-line method
Gutters & Ventalators VI
China-cap pattern
Round ventilator cap
Used in low-velocity systems
Developed using radial-line method