Prism Ball Back-Point Location: Difference between revisions
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<div style="font-size:170%; font-weight:bold; margin-bottom:4px;">Back Point Measurement</div> | |||
<div style="margin-bottom:8px;">Establishing pipe orientation and centerline vectors using direct prism observations in automet® FAB.</div> | |||
<div style="font-size:90%;">[[Main Page|← Main Page]] · [[Automet® FAB - General Survey Concept|← Data Capture]]</div> | |||
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[[File:Back Point Location.png| | == Overview == | ||
The **back point** establishes the trajectory and orientation of the attached pipe run relative to the measured flange face plane. | |||
Unlike diameter points or stop points, **the back point is measured using the standard 44 mm prism ball directly on the pipe surface without any survey adapter device** (such as a type 7 device). | |||
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[[File:Back Point Location.png|center|650px]] | |||
<div style="margin-top:6px; font-size:85%; font-weight:bold;">Direct prism ball placement for back point observation on pipe body</div> | |||
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== Measurement Guidelines == | |||
* '''Hardware setup:''' Place the prism ball directly against the outer pipe wall along the pipe centerline. Do not attach the type 7 device. | |||
* '''Placement location:''' Position the observation anywhere along the pipe run heading away from the flange face. | |||
* '''Data purpose:''' automet® FAB uses the back point vector in conjunction with the diameter points to calculate spatial alignment and determine elbow/fitting offsets during analysis. | |||
Revision as of 09:21, 9 October 2026
Back Point Measurement
Establishing pipe orientation and centerline vectors using direct prism observations in automet® FAB.
Overview
The **back point** establishes the trajectory and orientation of the attached pipe run relative to the measured flange face plane.
Unlike diameter points or stop points, **the back point is measured using the standard 44 mm prism ball directly on the pipe surface without any survey adapter device** (such as a type 7 device).
Direct prism ball placement for back point observation on pipe body
Measurement Guidelines
- Hardware setup: Place the prism ball directly against the outer pipe wall along the pipe centerline. Do not attach the type 7 device.
- Placement location: Position the observation anywhere along the pipe run heading away from the flange face.
- Data purpose: automet® FAB uses the back point vector in conjunction with the diameter points to calculate spatial alignment and determine elbow/fitting offsets during analysis.