10-003591-01EN [Q7780031], Rev. 4, January 2020
Preparation for Inspection 31
To clean the inspection surface
1. Carefully use an appropriate metal scraper, chisel, or file to remove scaling,
protruding metal, or weld residue on the surface, without affecting the structural
integrity and curvature of the surface.
2. Use a metal brush to remove any remaining loose material on the surface.
3.3 Setting Up the Scan and Index Parameters for an Elbow
Before an inspection, on the OmniScan instrument, you must set the required scan
and index parameters for your elbow size. These are determined by your probe’s
effective beam width, elbow dimensions, and desired scan overlap.
To set up the scan and index parameters for an elbow
1. Measure and record your elbow’s extrados (maximum, outer elbow curve length
on surface; see Figure 3-2 on page 31).
Figure 3-2 Extrados — maximum outer elbow curve length
2. Set the scan parameters:
a) Divide the extrados value by two and add your preferred “safety factor,” or
extra scan length value (for example: 500 mm/2 + 10 mm = 260 mm).
b) In the OmniScan MXU software, select Scan > Area > Scan Start =
[EXAMPLE −260.00], and Scan End = [EXAMPLE 260.00] (see Figure 3-3 on
page 32).
c) Set the Index End value equal to or greater than the pipe circumference value.
Extrados
Origi
n
Extra scan length
To Next Page
Loading...
