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GB/T 37122-2018 PDF in English


GB/T 37122-2018 (GB/T37122-2018, GBT 37122-2018, GBT37122-2018)
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GB/T 37122-2018: PDF in English (GBT 37122-2018)

GB/T 37122-2018
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.100
J 04
Non-destructive testing - Phantom of maximum
detectable steel thickness for industrial computed
tomography (CT) testing
ISSUED ON: DECEMBER 28, 2018
IMPLEMENTED ON: JULY 01, 2019
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Classification, types and marks ... 4 
5 Technical requirements ... 9 
6 Inspection methods ... 13 
7 Inspection rules ... 15 
8 Marks and labels ... 17 
9 Packaging, transport and storage ... 17 
Non-destructive testing - Phantom of maximum
detectable steel thickness for industrial computed
tomography (CT) testing
1 Scope
This Standard specifies the classification, types and marks, technical
requirements, inspection methods, inspection rules, packaging, transport and
storage for phantom of maximum detectable steel thickness for industrial
computed tomography (CT) testing.
This Standard is applicable to type inspection and exit-factory inspection for
phantom of maximum detectable steel thickness for industrial CT testing of
which radian energy is 225keV and above. This Standard can also be used as
the basis for acceptance of user orders.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 34365, Non-destructive testing - Terminology - Terms used in industrial
computed tomography testing
GB/T 37158, Non-destructive testing - Test method for measuring the
maximum detectable steel thickness by industrial computed tomography (CT)
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T
34365 and GB/T 37158 apply.
4 Classification, types and marks
4.1 Classification
4.1.1 Overview
provides marking pattern for ring of phantom of maximum detectable steel
thickness.
4.3.2 Pattern 1:
XD-I-0200 GB
Where,
XD - Line-pair phantom;
I - I-type line-pair phantom;
0200 - Minimum sheet thickness is 0.20mm;
GB - Comply with this Standard.
4.3.3 Pattern 2:
YK-II-0400 GB
Where,
YK - Round-hole phantom;
II - II-type round-hole phantom;
0400 - Minimum aperture is 0.40mm;
GB - Comply with this Standard.
4.3.4 Pattern 3:
YH-090-110 GB
Where,
YH - Ring;
090 - Inner diameter of ring is 90mm;
110 - Outer diameter of ring is 110mm;
GB - Comply with this Standard.
5 Technical requirements
5.1 Ring
5.2.2.8 Tolerance of sheet thickness in line-pair phantom T does not exceed
±0.005mm. Tolerance of clearance width of adjacent sheets T is ±0.01mm.
5.2.2.9 Measured value of sheet length in line-pair phantom does not exceed
±0.05mm.
5.2.3 Materials
5.2.3.1 Substrate of line-pair phantom is made of No. 35 high-quality carbon
structural steel or materials of equivalent performance. Substrate material of
slot part of internal rectangle is transparent resin or air.
5.2.3.2 Sheet in line-pair pair is made of 65Mn or material of equivalent
performance.
5.2.3.3 The material of line-pair phantom sealing cover is polymethyl
methacrylate (plexiglass). Use glue to bond along with the edge of cylinder.
Bonding shall not affect the transparency of the cover of substrate slot part.
5.3 Round-hole phantom
5.3.1 Appearance
5.3.1.1 Round-hole phantom shall use the upper and lower covers made of
transparent material to bond, playing a role as sealing. There is no debris in the
round hole. It shall mark testing position.
5.3.1.2 The marking content and position shall be correct. It shall use laser
engravement in obvious places. The package does not block it.
5.3.1.3 The surface of round-hole phantom shall be clean, smooth and rust-
proof.
5.3.2 Size
5.3.2.1 Outer diameter of round-hole phantom is D0. Tolerance is mm.
5.3.2.2 See Table 4 for models of round-hole phantom and corresponding outer
diameter sizes.
Table 4 -- Models of round-hole phantom and corresponding outer
diameter sizes
Model I-type II-type
Outer diameter D0
mm 20 30
5.3.2.3 Thickness of sealing cover of round-hole phantom δ is 1mm.
6.2.1.2 For exit-factory inspection, it shall take three directions at an angle of
60° on the circumference of the ring to measure.
6.2.2 Inner diameter of ring d
6.2.2.1 Use an appropriate method of which error is not greater than 0.02mm
to measure.
6.2.2.2 For exit-factory inspection, it shall take three directions at an angle of
60° on the circumference of the ring to measure.
6.3 Line-pair phantom
6.3.1 Sheet thickness T
6.3.1.1 Use an appropriate method of which error is not greater than 0.001mm
to measure.
6.3.1.2 For type inspection, it shall appropriately select two points in upper and
lower parts as measurement points on each metal sheet. And horizontally select
three different positions at left, center and right at each measurement point.
6.3.1.3 For exit-factory inspection, it may measure the thickness of all metal
sheets before line-pair phantom assembly.
6.3.2 Sheet spacing 2T
6.3.2.1 Use an appropriate method of which error is not greater than 0.005mm
to measure.
6.3.2.2 For type inspection, it shall appropriately select two points in upper and
lower parts as measurement points. And horizontally select three different
positions at left, center and right at each measurement point.
6.3.2.3 For exit-factory inspection, it shall measure spacing of each two
adjacent sheets.
6.3.3 Sheet length L
6.3.3.1 Use an appropriate method of which error is not greater than 0.02mm
to measure.
6.3.3.2 For exit-factory inspection, it shall appropriately select three positions
on each metal sheet as measurement points to measure. And randomly extract
50% of metal sheet for length measurement.
6.3.4 Outer diameter of line-pair phantom D0
6.3.4.1 Use an appropriate method of which error is not greater than 0.02mm
to measure.
6.3.4.2 For exit-factory inspection, it shall take three directions at an angle of
60° on the circumference to measure.
6.4 Round-hole phantom
6.4.1 Aperture d0
6.4.1.1 Use an appropriate method of which error is not greater than 0.02mm
to measure.
6.4.1.2 For type inspection, it shall measure each round hole in two directions
perpendicular to each other on the circumference.
6.4.1.3 For type inspection, it shall measure each round hole in two directions
perpendicular to each other on the circumference.
6.4.2 Hole spacing S0
6.4.2.1 Use an appropriate method of which error is not greater than 0.02mm
to measure.
6.4.2.2 For type inspection, it shall measure spacing between each adjacent
two holes.
6.4.2.3 For exit-factory inspection, it shall measure spacing between each
adjacent two holes.
6.4.3 Outer diameter of round-hole phantom D0
6.4.3.1 Use an appropriate method of which error is not greater than 0.02mm
to measure.
6.4.3.2 For exit-factory inspection, it shall take three directions at an angle of
60° on the circumference to measure.
6.4.4 Substrate round hole of round-hole phantom and reference plane
perpendicularity
Use an appropriate method of which error is not greater than 0.02mm to
measure.
7 Inspection rules
7.1 Classification of inspection
7.1.1 Type inspection
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.