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Chinese Standard: 'TSGD7005-2018'
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Standard ID TSG D7005-2018 (TSGD7005-2018)
Description (Translated English) Periodic Inspection Regulation for Industrial Pressure Piping
Sector / Industry Special Equipment Industry Standard
Word Count Estimation 35,348
Date of Issue 2018-01-26
Date of Implementation 2018-05-01
Drafting Organization China Special Equipment Inspection and Research Institute
Administrative Organization State Administration of Quality Supervision, Inspection and Quarantine
Regulation (derived from) AQSIQ Announcement No. 17 of 2018

TSG D7005-2018
Periodic inspection regulation
for industrial pressure piping
压力管道定期检验规则 - 工业管道
Issued by. General Administration of Quality Supervision, Inspection and
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
(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. 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-
(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. 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. 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;
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
(5) Abnormal damage of support & 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. 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
(2) The piping is thinned significantly and has been checked for strength
verification, which cannot guarantee safe operation until the next
(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
(5) The grade of aging or creep damage of the piping material exceeds the
requirements of relevant standards;
(6) It has produced creep cracks or fatigue cracks.
safety technical specifications or design and installation standards, if it
cannot be adjusted or repaired in time, for the piping which does not bear
obvious alternating load and from which no new defect is found through
periodic inspection (excluding normal uniform corrosion), it can be rated
as grade 2 or grade 3; otherwise it shall perform safety assessment. If
the results of safety assessment confirm that it does not affect the safe
use, it can be rated as grade 2 or grade 3; otherwise it is rated as grade
3.2.2 Rating of materials of piping components
When the material of the piping components does not conform to the original
design, or when the material is unknown, or when the material is deteriorated,
it shall rate the grade of safety status according to the following requirements.
(1) When the material does not conform to the original design, if the material
is clear, the strength check is qualified, no new defect is detected after
inspection (excluding normal uniform corrosion), the inspectors believe
that it can be used safely, it does not affect the rating. If defects occur
during the process of use and it confirms that such defects are caused
by improper use of material, it may be rated as grade 3 or grade 4;
(2) When material is unknown, if the inspection does not reveal new defects
(excluding normal uniform corrosion) and the strength check is qualified
(calculated according to the lowest strength of similar materials), it may
be rated as grade 3; otherwise it is rated as grade 4;
(3) When the material is deteriorated and damaged, meanwhile it is found
that there is material deterioration such as surface decarburization,
carburization, spheroidization, graphitization, tempering embrittlement,
damage such as creep, high-temperature hydrogen corrosion, or
abnormal hardness value, if the deterioration or damage is slight and it
can be confirmed that it can be safely used under the operating
conditions and during the inspection cycle, it may be rated as grade 3; if
it produces irreparable defects or damage, according to the degree of
damage, it is rated as grade 3 or grade 4;
(4) When the hardness value in the wet H2S environment exceeds the
standard, meanwhile the hardness value of the welded joint of carbon-
steel and low-alloy steel piping exceeds HB200 but no stress corrosion
occurs, if the inspectors believe that stress corrosion will not occur in the
next inspection cycle, it may be rated as grade 2 or grade 3; otherwise it
is rated as grade 4.
3.2.3 Rating of overall thinning of wall-thickness of piping and fitting
When the wall-thickness of piping and fitting is completely reduced, it shall
personnel. The approval personnel shall be the technical principal or authorizer
of the inspection institute.
Inspection records and inspection reports (single item report) shall be signed
by the personnel who participate in the inspection and testing on site. The
inspection institute shall keep the inspection records and inspection reports at
least until the next inspection cycle.
4.2 Initial conclusions of inspection
Due to the need of piping operation, the inspector may, before issuing the report,
issue the “Notice on periodic inspection opinions for special equipment (1)” (see
Appendix C), notice the user organization of the initial conclusion of inspection
in a written manner. The inspector shall be responsible for the correctness of
the inspection opinions.
4.3 Special requirements for handling of problem
When finding the presence of defects which need to be handled during
inspection, the inspection institute may issue the “Notice on the periodic
inspection opinions for special equipment (2)” (see Appendix C), notice the
inspection conditions to the user organization. The user organization is
responsible for entrusting the organization with corresponding qualifications to
handle the defects. After the defects are handled and they are confirmed by the
inspection institute that the handling results comply with the use requirements,
it issues the inspection report. If the user organization fails to complete the
defect handling work within the agreed time, the inspection institute may issue
a periodic inspection report according to the actual inspection situation. The
report can be issued after finishing the handling work and it is confirmed by the
inspection institute.
When the inspection reveals a serious accident, the inspection institute shall
issue the “Notice of periodic inspection opinions for special equipment (2)”,
inform the situations to the use registration authority in a timely manner.
4.4 Reconsideration of inspection conclusions
If the user organization disagrees with the inspection conclusion, it shall, within
30 working days after the receipt of the inspection report or the “Notice of
periodic inspection opinions for special equipment (2)”, apply for
reconsideration to the local or provincial people’s government which is
responsible for the supervision and administration of the safety of special
Appendix A
Requirements for annual inspection of industrial piping
A1 Annual inspection
The annual inspection, that is, periodic self-inspection, refers to the inspection
of the presence of abnormal conditions of piping which affect the safe use by
the user organization when the piping is in operation. It shall be performed at
least once a year.
A2 Basic requirements for annual inspection
The user organization shall establish an annual inspection management system.
The annual inspection work may be carried out by the professionally trained
personnel organized by the safety management personnel of the user
organization, or by an inspection institute which has the periodic inspection
qualifications for industrial piping. When performing the annual inspection by
itself, it shall be equipped with the necessary inspection tools and equipment.
A3 Contents of annual inspection
The annual inspection shall include at least the inspection of the safety
management of the piping, the operation conditions of the piping, the safety
accessories, instruments. If necessary, it shall perform the determination of
wall-thickness and the measurement of resistance value.
A3.1 Inspection contents of piping’s safety management conditions
(1) Whether the safety management system and operating procedures are
complete and effective;
(2) Whether the design documents, installation as-built drawings, quality
certification documents, supervision and inspection certificates, data of
installation, modification, repair materials which are specified in the
relevant safety technical specifications are complete;
(3) Whether the safety management personnel work with certificate;
(4) Whether records of routine maintenance and operation, records of
periodic safety inspection meet the requirements;
(5) Whether the annual inspection and periodic inspection reports are
complete; whether the problems raised in the inspection and testing
reports are resolved;
(3) Whether the sealing device of the adjusting screw of the spring-type
safety valve is in good condition;
(4) If a shut-off valve is provided between the safety valve and the discharge
port, whether the shut-off valve is in the fully-open position and whether
the lead seal is intact;
(5) Whether the safety valve leaks;
(6) Whether the venting pipe is unobstructed; whether the rain cap is intact.
During the inspection, if finding the type selection error, beyond verification
validity period, or leakage, the user organization shall take effective measures,
to ensure the safe operation of the piping; otherwise it shall suspend the
operation of this piping.
A3.5.3 Contents of inspection of rupture disc device
(1) Whether the rupture disc exceeds the period of use as specified in the
product specification;
(2) Whether the installation direction of the rupture disc is correct; whether
the burst pressure and temperature on the product’s nameplate meet the
operational requirements;
(3) Whether the rupture disc device has a leakage;
(4) Whether the rupture disc has non-overpressure rupture or overpressure
non-rupture during use;
(5) Whether the venting pipe which is connected to the rupture disc’s holder
is unobstructed; whether there is water (or ice) in the venting pipe;
whether the waterproof cap and the rainproof piece are intact;
(6) If the shut-off valve is installed between the rupture disc device and the
piping, whether the shut-off valve is in the fully-open state and whether
the lead seal is intact;
(7) When the rupture disc device and the safety valve are used in series
connection, if the rupture disc device is installed at the outlet side of the
safety valve, check the pressure gauge and the shut-off valve installed
between the safety valve, as well as whether the pressure, drainage and
discharge capacity between the two meet the requirements;......
Related standard:   TSG 7005-2015  TSG Z7005-2015
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