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TSG D7005-2018: Periodic Inspection Regulation for Industrial Pressure Piping
TSG D7005-2018
TSG
TECHNICAL SPECIFICATION FOR
SAFETY OF SPECIAL EQUIPMENT
Periodic inspection regulation
for industrial pressure piping
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine
January 26, 2018
Table of Contents
Foreword ... 3 
1 General ... 5 
2 Periodic inspection ... 9 
3 Rating of the grade of safety status ... 21 
4 Records, reports and conclusions of periodic inspection ... 28 
5 Supplementary ... 30 
Appendix A Requirements for annual inspection of industrial piping ... 31 
Annex a Annual inspection report of industrial piping ... 39 
Appendix B Periodic inspection report of industrial piping ... 42 
Appendix C Notice of periodic inspection opinions of special equipment (1) . 46 
Periodic inspection regulation
for industrial pressure piping
1 General
1.1 Purpose
In order to regulate the periodic inspection of in-use industrial pressure piping,
in accordance with the “Special equipment safety law of the People’s Republic
of China”, “Special equipment catalogue”, the provisions of related safety
technical specifications, this Regulation is hereby formulated.
1.2 Scope of application
This rule applies to the periodic inspection of in-use industrial pressure piping
(hereinafter referred to as piping) (Note 1-1, Note 1-2).
Note 1-1. The periodic inspection of buried pipe sections can be carried out in
accordance with the relevant inspection items of the “Periodic inspection
regulations for oil and gas pressure piping” (TSG D7003) as well as the relevant
technical standards.
Note 1-2. Power piping (except for piping within the scope of boiler in “Boiler
safety - Technical supervision administration regulation” (TSG G0001)) are
classified according to grading conditions for industrial piping. The periodic
inspection refers to this Regulation as well as the standards to be followed
during construction; it may also refer to the related test items of the major
connection piping of the boilers which are covered by “Boiler periodical
inspection regulation” (TSG G7002) as well as the relevant technical standards.
1.3 Periodic inspection of piping
The periodic inspection of piping, that is, the comprehensive inspection, refers
to the conformity verification activities by the special equipment inspection
organizations (hereinafter referred to as inspection organization) against the
safety status of the piping, based on a certain time period, according to the
provisions of this Regulation, relevant safety technical specifications, the
relevant standards.
Periodic inspections shall be conducted on the basis of annual inspection.
1.4 Work procedures of periodic inspection
The user organization shall fulfill the following obligations.
(1) Formulate a periodic piping inspection plan; apply to periodic inspection
to the inspection institute 1 month before the valid period of the periodic
inspection of the piping;
(2) Do well in inspection coordination and safety supervision; be responsible
for the authenticity of the relevant information provided;
(3) For the defects and problems which are found in the inspection, propose
the treatment or rectification measures, be responsible for their
implementation, feedback the treatment or rectification conditions, in
writing, to the inspection institute.
1.8 Duties of inspection institute and inspectors
(1) The inspection institute shall perform the inspection of the piping in
accordance with the approved inspection scope, be responsible for the
authenticity, accuracy and validity of the inspection report (Note 1-4);
(2) Personnel engaged in the inspection and testing of piping shall obtain
the corresponding certificate of special equipment inspection and testing
personnel, make registration in accordance with relevant provisions;
(3) After the inspection institute receives the periodic inspection application
from the user organization, it shall conduct the inspection in time;
(4) The inspection institute shall conduct periodically safety training for the
inspection work of the testing and inspection personnel, retain the
training records.
Note 1-4. Authenticity means that the report is based on objective facts and
does not make false evidence. Accuracy means that the accuracy of the test
data involved in the report meets the relevant requirements. Effectiveness
means that the qualification of the inspection institute and the inspector
complies with requirements; the measuring equipment, instrument and tools
which are used for inspection and testing are within the valid period of the
calibration standard; the basis for the testing is legal; the report’s approval
procedure complies with requirements.
1.9 Application of new techniques
If new techniques and new assessment methods are adopted in the inspection,
which are inconsistent with the requirements of this Regulation and the related
safety technical specifications, or if this Regulation and related safety technical
specifications do not make any requirements, or it may have major impact onto
the safety performance, the relevant organization shall provide the relevant
piping installation supervision and inspection certificates;
(3) Data on reconstruction or major repair, including construction plans and
completion data, as well as the supervision and inspection certificate of
the reconstruction and major repair which is required by the relevant
safety technical specifications;
(4) Data of utilization management, including “Use registration certificate”,
“Use registration form”, “Basic information collection of pressure piping -
Industrial pressure piping”, as well as the operation records,
startup/shutdown records, changes in operation conditions,
abnormalities in operation, records on corresponding treatment, etc.
(5) Testing and inspection data, including the verification and calibration data
on the safety accessories and instrument, the annual inspection report in
the periodic inspection cycle, the previous periodic inspection report.
The inspector shall review the piping information which is provided by the user
organization. The information in items (1) to (3) of this clause must be reviewed
at the time of the first periodic inspection of the piping after it is put into use.
The subsequent inspections will be reviewed as required (for example, if
alterations or major repairs are performed).
2.3.2 Preparation work for inspection site
The user organization and related supporting organizations (such as repair and
maintenance organizations, etc., the same below) shall do well in the technical
handling after the shutdown and the safety inspection before the inspection
according to the requirements, to confirm that the site conditions meet the
requirements of the inspection work, to finish the relevant preparation work.
Before the inspection, the inspection site shall meet at least the following
conditions.
(1) Auxiliary parts or other objects that affect the inspection shall be cleaned
or removed in accordance with the inspection requirements;
(2) Scaffolding, portable ladders and other facilities for inspection purposes
shall be safe and secure (for the scaffolding more than 2 m above the
ground, set the protective devices such as safety guardrails);
(3) The surface of the piping to be inspected shall be ground and cleaned,
especially the corroded location and the parts where crack defects may
occur, which shall be thoroughly cleaned to expose the metal body. The
surface to be subjected to non-destructive testing shall comply with NB/T
47013 Non-destructive testing of pressure equipment;
(4) During piping inspection, it shall be ensured that it is reliably isolated from
may have seepage of rainwater shall be subjected to non-destructive
testing of the outer surface at the corresponding parts;
(3) When the inspector deems it necessary, the fillet welds and so on of the
branch piping shall be subjected to the non-destructive testing of the
outer surface;
(4) For carbon steel, low-alloy steel low-temperature piping, Cr-Mo steel
piping, low-alloy steel piping which has the lower limit of standard tensile
strength greater than or equal to 540 MPa, piping which is subjected to
long-term obvious alternating load, grade GC1 piping which is subjected
to the first periodic inspection, it shall perform the sampling inspection of
non-destructive testing at the outer surface of the weld joint and stress-
concentrated parts, the sampling inspection ratio shall be not less than
5% of the quantity of the weld joint, meanwhile the number shall be not
less than 2;
(5) For piping which has a tendency of environmental cracking, it may use
other testing methods at the outer surface to perform sampling inspection
of the inner surface. The sampling inspection ratio shall be not less than
10% of the quantity of the butt-welded joints, meanwhile the quantity shall
be not less than 2;
(6) When cracks are found in the testing, the inspector shall expand the
proportion of surface defect testing, in order to find other defects that may
exist.
2.4.2.4 Testing of buried defects
The testing of buried defect generally uses methods such as radiographic or
ultrasonic testing as specified in NB/T 47013. When radiographic or ultrasonic
testing is not possible at the inspection site, it may use other effective methods
of testing. For the piping which is subjected to the first inspection, it shall
perform the testing of buried defects according to the sampling inspection ratio
as specified in Table 2-2 (note 2-2). For the next inspection, the testing of buried
defect is generally not performed again. When it is found that there is an
indication of internal damage or if the risk of exceeding the standard is found in
the previous inspection, it shall perform the testing of buried defect at the
sampling inspection ratio which is not less than those specified in Table 2-2.
The specific sampling inspection ratio for the testing of buried defects as well
as the requirements for key positions are as follows.
(1) The sampling inspection ratios of ultrasonic testing or radiographic
testing of the grade GC1 and GC2 piping’s weld joints are as shown in
Table 2-2. If no abnormalities are found in the grade GC3 piping, it is
generally not necessary to carry out ultrasonic testing or radiographic
determined by chemical analysis, spectral analysis, etc. according to the
specific conditions. It is not necessary to inspect this item during re-
inspection;
(2) For piping which has a tendency of high-temperature creep and material
deterioration, it shall select a representative position to perform hardness
testing; it shall carry out metallographic analysis if necessary;
(3) For piping which has requirements for weld hardness, it shall test the
hardness of the weld joint.
2.4.2.6 Verification of pressure strength
When the total thinning amount of the piping components exceeds 20% of the
nominal thickness, or when the inspectors have doubts about the strength of
the piping, it shall verify the pressure strength. The pressure for verification shall
be not less than the allowable (monitoring) use pressure of the piping. The
verification of pressure strength is carried out in accordance with the
requirements of the corresponding piping design standards.
2.4.2.7 Stress analysis
When the inspector or the user organization deems it necessary, it shall perform
stress analysis for the piping in one of the following cases.
(1) No strength calculation sheet, and t0 ≥ Do/6 or p0 /[σ]t > 0.385;
Where.
t0 - Designed wall-thickness of piping, mm;
Do - Designed outer diameter of piping, mm;
p0 - Design pressure, MPa;
[σ]t - Allowable stress of the material at the design temperature, MPa.
(2) It has large deformation or deflection;
(3) Leakage or damage of the sealing structure caused by piping stress;
(4) Requiring the setting of compressor but not available, or the failure of
compensator;
(5) Abnormal damage of support and hanger;
(6) The structure is unreasonable and serious defects have been found;
(7) There is a serious overall thinning of the wall-thickness.
hardness and metallographic examination, which focuses on the
inspection of the graphitization and pearlite spheroidization damage.
When the running time reaches to or exceeds 2 x 105 h, according to the
inspection results of metallographic and hardness, if necessary, cut the
piping to perform material assessment according to relevant standards.
(2) When the working temperature is greater than or equal to 400 °C and
less than 450 °C, after running for 8 x 104 h, according to the running
status of the piping, randomly inspect the hardness and metallographic
structure. The time and proportion of the next sampling inspection are
determined according to the inspection result;
(3) For the piping which has been equipped with the creep measuring point,
check whether the creep measuring record meets the relevant standards;
(4) For the power piping which has been operated for more than 2 x 105 h, if
it is found through inspection that the metallographic spheroidization,
creep damage or material aging grade, creep strain, creep rate exceed
the requirements of the relevant standards, it shall be treated or replaced
in time.
2.7.1.2 9% ~ 12% Cr series steel-made power piping
The periodic inspection of the 9% ~ 12% Cr series steel-made power piping
shall include the hardness and metallographic sampling inspection.
2.7.2 Handling of defects
In any of the following cases, the piping segment shall be replaced.
(1) The outer surface of the piping has macroscopic cracks and obvious
bulging;
(2) The piping is thinned significantly and has been checked for strength
verification, which cannot guarantee safe operation until the next
overhaul;
(3) The piping is obviously inflated and cannot guarantee safe operation until
the next overhaul;
(4) The depth of the corrosion point of the piping is greater than 30% of the
wall-thicknes...