GB/T 20801.6-2020 PDF English
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| GB/T 20801.6-2020 | English | 485 |
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Pressure piping code - Industrial piping - Part 6: Safeguarding
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| GB/T 20801.6-2006 | English | 85 |
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Pressure piping code -- Industrial piping -- Part 6: Safeguarding
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GB/T 20801.6-2020: Pressure piping code - Industrial piping - Part 6: Safeguarding---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT20801.6-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 23.040
J 74
Replacing GB/T 20801.6-2006
Pressure piping code - Industrial piping - Part 6.
Safeguarding
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 Safety relief device... 11
5 Flame arrester... 19
6 Other safety protection devices... 20
7 Safety protection... 21
Appendix A (Informative) Safety protection layer analysis... 25
Appendix B (Informative) Calculation of safety relief device... 27
Appendix C (Informative) Selection of safety relief device... 39
Appendix D (Informative) Types and selection of flame arresters... 42
Appendix E (Informative) MESG and explosion group of combustible gas and
vapour... 46
References... 49
1 Scope
This Part of GB/T 20801 specifies the basic requirements for safety protection
devices, such as safety relief devices, flame arresters, fire emergency block
valves and mechanical interlocking devices, of the pressure piping system, and
safety protection.
For other safety protection requirements, which are not specified in this Part,
refer to other parts of GB/T 20801 and the provisions of relevant national
regulations, standards and specifications.
This Part applies to the safety protection of pressure piping systems that are
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 12158, General guideline for preventing electrostatic accidents
GB/T 12242, Performance test code - Pressure relief devices
GB/T 15605, Guide for pressure venting of dust explosions
GB/T 15706, Safety of machinery - General principles for design - Risk
assessment and risk reduction
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 20801.5-2020, Pressure piping code - Industrial piping - Part 5.
Inspection and testing
3 Terms and definitions
Terms and definitions determined by GB/T 20801.1-2020, GB/T 20801.2-2020,
GB/T 20801.3-2020, GB/T 20801.4-2020, GB/T 20801.5-2020, and the
following ones are applicable to this document.
3.1 Safety protection device
The mechanical (physical) protection devices that function in the event of failure
of automatic control instruments and manual intervention according to the
analysis of the safety protection layer (see Appendix A).
3.2 Safety relief device
The device that is started by the static pressure of the inlet or the static pressure
difference between the inlet and outlet to release the fluid to prevent the
pressure in the system from exceeding the predetermined safe value in the
case of non-fire or fire accidents.
3.3 Safety valve
The valve that is controlled by spring action or pilot valves. When the static
pressure at the inlet (static pressure difference between the inlet and outlet for
ordinary valves) exceeds the set pressure, the valve opens to release the fluid
to prevent the pressure in the system from exceeding the predetermined safe
value. When the pressure drops to the re-seating pressure, the valve can be
4 Safety relief device
4.1 General provisions
4.1.1 The safety relief device shall prevent overpressure accidents in any part
of the independent pressure system. Designers should use various process
hazard assessment (PHA) methods to study all possible overpressure
conditions in the specific process. When identifying various overpressure
conditions, the following guidelines shall be followed.
4.1.2 Automatic control instruments and alarm interlocking devices shall not
replace safety relief devices as the system's overpressure protection facilities.
When emissions are not allowed or safety relief devices cannot be installed, all
overpressure conditions can be evaluated and analyzed through process
hazard sources, and a system design method, i.e., intrinsic safety design or
high integrity protection system (HIPS), can be used to eliminate the cause of
system overpressure or perform system overpressure protection.
4.1.3 Equipment or piping systems that meet the following conditions shall be
equipped with safety relief devices.
4.1.4 The independent pressure system shall be equipped with one or more
parallel safety relief devices at appropriate locations.
4.1.5 The determination of relevant pressures of the safety relief device shall
meet the following requirements.
4.2 Determination of required relief capacity and minimum relief area.
4.2.1 Under typical overpressure conditions, the required relief capacity shall
be determined according to the criteria in Table 2.
4.3 Setting of inlet and outlet valves and piping of safety relief devices
4.3.1 Block valves should not be installed at the inlet and outlet of the safety
relief device. When it is necessary to install due to the inspection and
maintenance of the safety relief device, the following requirements shall be met.
4.3.2 The inlet piping of the safety relief device shall meet the following
requirements.
4.3.3 The outlet piping of the safety relief device shall meet the following
requirements.
4.4 Selection of safety relief device
4.4.1 For the safety relief device, the relief medium, the process overpressure
conditions and the performance of the safety relief device shall be considered
when selecting the appropriate form of the safety relief device. See Appendix
C. The selection of the safety relief device shall comply with the relevant
standards.
4.4.2 Safety relief device products shall comply with the relevant standards
such as TSG ZF001, TSG ZF003 and GB/T 12242.
5 Flame arrester
5.1 Application of flame arrester
5.1.1 Flame arrestor products and applications shall comply with relevant
standards such as ISO 16852 and PD CEN/TR 16793.
5.1.2 In the process equipment, there are a large number of non-electrical
equipment and piping systems in potentially explosive environments. Flame
arrestor is the main safety protection device for explosion-proof of non-electrical
equipment. It has the function of preventing explosion, preventing explosion
from spreading through piping, and preventing deflagration from developing into
detonation. Refer to Appendix D for the types and selection of flame arresters.
5.2 Flame arrestor settings
The following equipment and piping systems shall be equipped with flame
arresters.
5.3 MESG and explosion group of combustible gas and vapour
According to MESG, combustible gas and vapour are divided into 7 explosion
groups, as shown in Table 3.The gap of the flame arrestor shall be smaller than
the MESG of combustible gas and vapour.
6 Other safety protection devices
6.1 Fire emergency block valve
6.1.1 Fire emergency block valves should be installed at the exit end of key
storage tanks such as large-scale, liquefied gas and acute toxicity category 1
and category 2 chemicals.
6.2 Mechanical interlocking device
6.2.1 Mechanical interlocking is a high-integrity safety protection device that
prevents major accidents caused by human error. Products shall comply with
relevant standards such as GB/T 15706.
6.2.2 When operational errors in operation and maintenance may cause major
accidents, mechanical interlocking devices should be installed.
7 Safety protection
7.1 General provisions
When taking safety protection measures, the following factors shall be
considered.
7.2 Safety protection in factory layout
7.2.1 The layout of equipment in the open air shall meet the following
requirements.
7.2.2 Flammable and toxic fluids shall be discharged into a closed system, and
shall not be directly discharged into sewers and the atmosphere.
7.2.3 Combustible gas whose density is greater than that of ambient air shall
be discharged into the flare system; combustible gas whose density is lower
than that of ambient air can be discharged into the atmosphere if a torch is not
allowed to be set up and it meets sanitary standards.
7.2.4 The vent pipe opening of the combustible gas piping and the discharge
position of the safety relief device shall meet the requirements of GB 50160,
GB 50984 and GB 31571.
7.2.5 The clearance height of overhead piping through roads, railways,
sidewalks, etc., and the horizontal distance from the edge of the piping frame
of the outer piping gallery to the building or other facilities shall meet the
requirements of GB 50160, GB 50016 and GB 50984.The clear crossing
distance between piping and high-voltage power lines shall comply with the
relevant standards for overhead lines.
7.2.6 The piping located above the passages, roads and railways shall not be
installed with valves, flanges, threaded joints and compensators with fillers and
other piping components that may leak.
7.2.7 No GC1 piping shall be arranged in the passable pipe trench.
7.3 Safety protection in production management
7.4 Safety protection facilities and measures
7.4.1 The fire-fighting system and sprinkler facilities shall include fire-proof
structures such as fire walls and explosion-proof walls of buildings, ventilation
devices, telemetry and remote-control devices that are removed with toxic,
corrosive or flammable vapors, and storage or recovery devices, facilities for
emergency treatment of hazardous materials, such as torches or incinerators.
7.4.2 Protective covers shall be provided at the brittle material piping system or
flanges, joints, valve covers, instruments or sight glasses, so as to limit and
reduce the hazard degree of leakage.
7.4.3 When the "water hammer" phenomenon may occur in piping filled with
liquid, or "steam hammer" may occur in piping with compressible fluid,
appropriate protective measures should be taken based on the analysis results
of fluid mechanics.
7.4.7 Necessary protective masks, gas masks, emergency breathing systems,
special medicines, portable combustible and toxic gas detection and alarm
systems and other sanitary safety equipment shall be installed. Emergency
showers and eyewash shall be installed near discharge points or leaks that may
cause accidental human injury.
7.4.8 For radiant fluid piping, shielding protection and automatic alarm systems
shall be provided, and special masks, gloves and protective clothing shall be
equipped.
7.4.9 Electrostatic grounding measures shall be taken for all piping systems
that may generate static electricity hazards in explosion and fire hazardous
locations. For example, it can be grounded through the grounding grid of
equipment, piping and civil structures, and flange jumper. Other anti-static
requirements shall meet the requirements of GB 12158.
7.4.10 The blind plate setting shall meet the following requirements.
7.4.11 When vapour, air, nitrogen and other public engineering piping are
connected with GC1 and GC2 piping, the following requirements shall be met.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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