Xtlo
Xtlo, a graphical standalone rigorous tube layout program, handles the following layouts:
- tubepass arrangement
- number of passes: 1, 2, 3, 4, 6, 8, 10, 12, 14, 16
- tube layout angle: 30, 45, 60, 90 degrees
- layout arrangement: H-style, ribbon, quadrant for 4 pass, rotated H-style, rotated ribbon, rotated quadrant
- location of first tubepass
- width of passlanes
- continuous cleaning lanes and symmetry
- number of seal strips and tie rods selected based on TEMA suggestions
- low-finned tube parameters specified directly or read from databank
- all TEMA shell styles
- shellside nozzles
- inlet, outlet, and liquid/vapor outlet
- impingement devices: rods or plates
- baffles
- single-segmental, single-segmental no-tubes-in-window (NTIW), double-segmental, and no baffles
- horizontal and vertical cut baffles
- user-specified baffle cut; baffle cut snaps to nearest tuberow column
- layout modification
- tubes changed to tierods, impingement rods, or dummy tubes
- tubes plugged graphically
- tierods, partition seal rods, seal strips, and skid bars added outside the tube pattern
- annotation capability

Drawing Specifications
Characteristics of Xtlo drawings are listed below:
- scale-drawing layouts
- support for all Microsoft® Windows printers
- interchangeable with other programs through enhanced metafiles, AutoCAD DXF files, and HTRI files
- layout details that list specific information about layout in each pass
Special Features
- Fully integrated with Xist
- User-modifiable tube layout tool and view
- Tube locations exportable to Microsoft Excel CSV file