GB/T 20801.5-2020 English PDF (GBT20801.5-2020)

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GB/T 20801.5-2020: Pressure piping code - Industrial piping - Part 5: Inspection and testing
GB/T 20801.5-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.040
J 74
Replacing GB/T 20801.5-2006
Pressure piping code - Industrial piping - Part 5:
Inspection and testing
ISSUED ON: NOVEMBER 19, 2020
IMPLEMENTED ON: JUNE 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 6 
4 Examination requirements ... 7 
5 Examination methods ... 8 
6 Examination scope and acceptance criteria ... 10 
7 Examination process ... 19 
8 Examination certificate and records ... 19 
9 Testing ... 19 
10 Record ... 29 
Pressure piping code - Industrial piping - Part 5:
Inspection and testing
1 Scope
This Part of GB/T 20801 specifies the basic safety requirements for pressure
piping inspection, examination and testing.
This Part applies to the inspection, examination and testing of pressure piping
which is defined by the scope of GB/T 20801.1.
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 20801.1-2020, Pressure piping code - Industrial piping - Part 1:
General
GB/T 20801.2-2020, Pressure piping code - Industrial piping - Part 2:
Materials
GB/T 20801.3-2020, Pressure piping code - Industrial piping - Part 3: Design
and calculation
GB/T 20801.4-2020, Pressure piping code - Industrial piping - Part 4:
Fabrication and assembly
GB/T 20801.6-2020, Pressure piping code - Industrial piping - Part 6:
Safeguarding
NB/T 47013.1, Nondestructive testing of pressure equipments - Part 1:
General requirements
NB/T 47013.2, Nondestructive testing of pressure equipments - Part 2:
Radiographic testing
NB/T 47013.3, Nondestructive testing of pressure equipments - Part 3:
Ultrasonic testing
NB/T 47013.4, Nondestructive testing of pressure equipments - Part 4:
Magnetic particle testing
Examination personnel
The full-time personnel engaged in the examination work in the manufacturing
plant, fabrication, construction, and erection units, which shall be held by
personnel independent of the manufacturing, fabrication and erection
departments.
4 Examination requirements
4.1 General provisions
4.1.1 This Chapter stipulates the piping installation, including requirements for
the examination of each component and its fabrication and processing
technology, additional examinations and acceptance standards required by any
engineering design. The examination of the chromium-molybdenum alloy steel
piping in Table A.1 of GB/T 20801.2-2020 shall be carried out after the end of
all heat treatment; the welding of branch piping and the repair of pressure-
bearing welded joints shall be completed before the welding of reinforcement
rings or saddle-shaped reinforcement parts.
4.1.2 The examination and testing of the piping components (or their elements)
which are processed by the factory shall meet the requirements of relevant
product standards and design documents.
4.2 Acceptance criteria
The examination and testing requirements, which are given in this Part, are
basic safety requirements. When there are special examination and testing
requirements in the design document, the examination, testing and acceptance
shall be carried out in accordance with the requirements of the design document.
4.3 Processing of out-of-gauge defects
The inspected parts, which are found to have defects that exceed the
acceptance criteria of this Part, shall be repaired or replaced. The new part shall
be inspected in the same way with the same acceptance criteria in the same
scope according to the requirements of the original.
4.4 Progressive examination
When out-of-gauge defects are found in partial or sampling examination, they
shall be dealt with according to the following requirements:
a) Take another two identical parts (if they are welded joints, they shall be
welded joints in the same batch and welded by the same welder) for the
same examination;
b) If the two inspected parts required by a) pass the examination, the batch
represented by the additional examination shall be deemed qualified, but
the defective parts shall be repaired or replaced for re-examination;
c) If any one of the two inspected parts required by a) is found to have an
out-of-gauge defect, two identical parts shall be added for each defect
item for examination;
d) If the two inspected parts required by c) pass the examination, the batch
represented by the additional examination shall be deemed qualified, but
the defective parts shall be repaired or replaced for re-examination;
e) If any one of the two inspected parts required by c) is found to have out-
of-gauge defects, all the batch shall be examined, and the unqualified
shall be repaired or replaced for re-examination;
f) If the defective part, after repair or re-examination after being replaced, is
found to have an out-of-gauge defect again, for the defect found in the
repair, it is not necessary to continue the progressive examination
according to a), c), and e); however, the out-of-gauge defective part shall
be repaired or replaced for re-examination, until it meets the acceptance
criteria of this Part. If possible, other un-examined welded joints can also
be examined partially or randomly.
4.5 Examination personnel
Field fabrication and welding examination and testing, if there is no special
indication, shall be carried out by the construction unit. The examination
personnel shall meet the definition in 3.4.
5 Examination methods
5.1 General provisions
5.1.1 This Chapter specifies the main examination methods that confirm to this
Part, the engineering design or the inspector’s requirements. If methods other
than those specified in this Chapter are used, the acceptance criteria shall be
specified in the engineering design.
5.1.2 The examination ratio includes 100% examination, sampling examination
and partial examination, which are defined as follows:
a) It is called 100% examination when, in a designated batch of piping, a
certain specific item is completely examined;
b) It is called sampling examination when, in a designated batch of piping, a
certain percent of a certain specific item is completely examined;
5.4 Hardness examination
Welded joints, hot bending and hot formed components shall be subjected to
the hardness examination, to check the reliability of the heat treatment process.
The number and requirements of the hardness examination shall comply with
the relevant regulations of GB/T 20801.4-2020.
6 Examination scope and acceptance criteria
6.1 Examination grade
6.1.1 Pressure piping is divided into five examination grades I, II, III, IV, V
according to piping grade, material category and nominal pressure. When
pressure piping is divided into different examination grades according to 6.1.2
~ 6.1.6, the examination grade shall be determined according to the higher
examination grade. Special requirements in relevant design documents, if any,
shall also be met.
6.1.2 The examination grade of the pressure piping that meets one of the
following conditions is grade I:
a) Piping, of ...