Dummy Support Calculator

Dummy Support Calculator is a pipe fabrication calculator for dummy supports, saddle cuts, fishmouth cuts, elbow trunnions, and elbow miter layout work.

The app helps calculate the cut line where a dummy pipe meets a run pipe or elbow surface, then provides practical dimensions, development data, and marking information for shop-floor fabrication.

Supported calculations:
- Straight Dummy: fishmouth saddle cut for a dummy pipe welded to a horizontal run pipe
- Elbow Trunnion: dummy support layout on an elbow surface
- Elbow Miter: cutting data for standard 45° and 90° elbows

Key features:
- NPS pipe size selection
- Automatic pipe outside diameter reference
- Center-height based dummy length calculation
- 2D section view with dimensions
- Saddle depth and dummy circumference calculation
- Development graph for marking
- Coordinate table for layout points
- Marking PDF export and sharing

This app is designed for pipe fitters, fabricators, welders, piping engineers, and field workers who need quick layout support for pipe dummy supports and saddle-cut marking.

Common use cases:
- Pipe dummy support fabrication
- Saddle cut layout
- Fishmouth cut calculation
- Pipe support marking
- Elbow trunnion layout
- Elbow miter cutting
- Workshop and field measurement support

Core calculations are processed on the device. The app is intended as a practical fabrication aid and should be used with proper engineering review, site standards, and field verification.