SH/T 3164-2021 PDF English
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SH/T 3164-2021: Design specification for instrument system lightning surge protection in petrochemical industry
---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/SHT3164-2021
SH
PETROCHEMICAL INDUSTRY STANDARD
ICS 91.120.40
P 72
File No.. J3023-2022
Replacing SH/T 3164-2012
Design specification for instrument system lightning surge
protection in petrochemical industry
Issued on. AUGUST 21, 2021
Implemented on. FEBRUARY 01, 2022
Issued by. Ministry of Industry and Information Technology of the People's
Republic of China.
Table of Contents
Foreword... 4
1 Scope... 6
2 Normative references... 6
3 Terms and abbreviations... 6
4 General... 10
5 Decision of lightning surge protection engineering for instrumentation... 10
6 Earthing system in lightning surge protection engineering for instrumentation... 11
7 Surge protective device... 16
8 Surge protection for instrumentation in control room... 19
9 Lightning and surge protection for field instrumentation... 20
10 Lightning and surge protection for cables... 22
11 Surge protection for intrinsic safety system... 24
12 Surge protection for fieldbus system... 25
13 Lightning protection for control building... 27
Appendix A (informative) Network type earthing referenced drawing... 28
Appendix B (informative) Shielding of cables earthing referenced drawing... 30
Bibliography... 34
Explanation of terms used in this Specification... 35
Instructions for revision... 37
1 Scope
This Specification specifies the design rules for lightning protection engineering of
instrument systems.
This Specification is applicable to the lightning protection design of instrument systems
for explosive environments and non-explosive environments in new construction,
expansion and reconstruction projects of petrochemical and coal-based fuel and
chemical product plants.
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 50057-2010, Code for design protection of structures against lightning
GB/T 18802.21, Low-voltage surge protective devices -- Part 21.Surge protective
devices connected to telecommunications and signaling networks -- Performance
requirements and testing methods
3 Terms and abbreviations
3.1 Terms
For the purposes of this document, the following terms and definitions apply.
3.1.1 air-termination system
Metal objects and metal structures used to directly receive or withstand lightning strikes,
such as. lightning rods (formerly known as lightning rods), lightning strips (wires),
lightning nets, etc.
3.1.5 bonding
Connect equipment, instruments, earthing busbars, etc. that need to be earthed with
earthing wires and bonding conductors to form a earthing system.
3.1.6 bonding conductor
A conductor that is used to connect various equipment that need to be earthed, various
bonding bars, etc., to form a earthing system.
3.1.11 lightning electromagnetic induction
The phenomenon that the lightning current generates an electromagnetic field in the
surrounding space and the conductor in this electromagnetic field generates an induced
electromotive force.
3.1.12 electromagnetic shielding
A barrier to the protected target with materials that can reduce the passage of
electromagnetic fields.
3.1.13 lightning surge
The pulse-shaped current and voltage generated by lightning electromagnetic induction
and conducted along a circuit or conductor. It is also called lightning surging.
3.1.14 equipotential bonding
Use conductors to conductively connect various metal components, metal facilities,
metal pipes, metal equipment, etc., so that the potential of each object is approximately
equal.
3.1.27 safety extra-low voltage
The voltage that electrical insulation and isolation from other power systems, voltage
does not exceed the limit. ≤ AC 50V, or ≤ DC 120V, exposed conductive parts are not
earthed, in compliance with GB/T 16895.21-2020/IEC 60364-4-41.2017 on safety
extra-low voltage specified voltage.
3.2 Abbreviations
The following abbreviations apply to this Specification.
4 General
4.1 The design of lightning protection projects shall determine the appropriate
protection scope and adopt appropriate protection plans based on the specific conditions
of the protection targets, so as to reduce the risk of lightning strikes to a tolerable level,
4.2 Lightning surge protection engineering for instrumentation shall adopt the
following methods at the same time.
4.3 The protective earthing, working earthing, intrinsic safety earthing, shielding
earthing, anti-static earthing, and surge protective device earthing of the instrument
shall finally be connected to the electrical earth termination system. The earth resistance
shall comply with the earth resistance of the electrical earth termination system.
5 Decision of lightning surge protection engineering for instrumentation
5.1 The implementation of lightning surge protection engineering for instrumentation
shall be determined based on one of the conditions of 5.2 to 5.6.
Abbreviation Full English name
5.4 When the regulatory authorities or owners assess that the possible economic losses
caused by lightning strikes are greater than the tolerable economic losses, or the
expected risks of lightning strikes are greater than the tolerable risks, lightning surge
protection engineering for instrumentation shall be implemented.
5.5 When the number of lightning strikes with lightning current intensity above 130kA
has occurred in the factory area ≥ 2 times/year, it is appropriate to implement lightning
surge protection engineering for instrumentation.
5.6 Departments with corresponding management or supervision rights may implement
lightning surge protection engineering for instrumentation in accordance with
regulations without evaluation.
6 Earthing system in lightning surge protection engineering for instrumentation
6.1 Instrumentation earthing system in control room
6.1.1 The instrument earthing system in the control room shall adopt a mesh-structured
earthing system, which can be used in various buildings and rooms equipped with
instruments.
6.1.5 For single-row cabinets or single-row consoles, a single bonding bar shall be used.
6.1.6 The bonding bar of the mesh structure shall be made of copper or hot-dip
galvanized flat steel welded with a cross-sectional area of ≥40 mm × 4 mm (width ×
thickness). There shall be no wire connections between bonding bar materials.
6.1.7 The bonding bar of the mesh structure shall be installed on the bottom support of
the cabinet or other brackets. The height shall be close to the bottom of the cabinet, see
Appendix A. The bonding bar shall be installed using non-insulating brackets and other
materials.
6.1.12 The earth wire (PE wire) from the power supply system shall be connected to
the bonding bar of the instrument distribution cabinet. Multi-stranded copper core wires
with a cross-sectional area of ≥16 mm2 shall be connected to the mesh structure bonding
bar by crimping.
6.2 Cabinet and operating console earthing
6.2.1 The working earthing and protective earthing in the cabinet shall be directly
connected to the nearest bonding bar below according to the earthing diagram in Figure
6.2.4 Copper or hot-dip galvanized flat steel with a cross-sectional area of ≥40mm ×
4mm (width × thickness) shall be laid as a bonding bar along the power supply cable
path for instruments, operating equipment, and metal operating desks that need to be
earthed. Metal operating consoles equipped with equipment that require external
earthing shall be connected to the nearest bonding bar according to Figure 6.2.4.
6.2.5 Every instrument, equipment, instrument panel, operating console, etc. that needs
to be earthed shall be connected to a mesh-type bonding bar using a earthing wire. The
number of series connections required shall be ≤3.The cabinet shall not be earthed in a
chained series manner connected by wires.
6.3 Bonding conductor and wire
6.6 Earthing sign
6.6.1 The construction of various earthing wires, bonding conductors, bonding bars, etc.
in the control room shall be easy to inspect and maintain. Visible signs shall be set up.
6.6.2 The connection to the bonding terminal shall be clearly marked.
7 Surge protective device
7.1 General
7.1.1 Surge protective devices shall be maintenance-free. They shall be able to
withstand multiple lightning surges without being damaged.
7.1.4 When the instrument needs to be equipped with a surge protective device, it shall
be configured according to the provisions of 7.2, 7.3, and 7.4.
7.1.5 Surge protective devices with monitoring functions can be used and
corresponding centralized monitoring equipment can be configured.
7.2 Type of surge protective device
7.2.1 Commonly used surge protective devices for instruments include. signal type, DC
24V power supply type, AC or DC 220V power supply type, communication type, etc.
The selection shall be determined based on factors such as protection purpose, signal
type, operating voltage level, installation location, and installation method.
7.2.5 The control system communication network shall be equipped with surge
protective devices according to the communication category. Specifications and
parameters shall be suitable for the connected communication equipment.
7.2.6 Surge protective devices with multiple signal channels shall not be used. For four-
wire instruments powered by DC 24V, since the supply current value is similar to the
signal current value, the power supply line is regarded as a signal channel, and a dual
signal channel surge protective device can be used.
7.3 Parameters of surge protective device for signal type
The basic parameters of surge protective device for signal type shall comply with the
requirements in Table 7.3.
7.5.2 For on-site AC power supply instruments that need to be equipped with surge
protective devices, surge protective devices shall be equipped according to the AC
power supply parameters.
8 Surge protection for instrumentation in control room
8.1 Shielding for instrumentation in control room
8.2 Installation for surge protective device
8.2.1 Control room instrumentation shall be equipped with surge protective devices as
specified in Chapter 7.
8.2.2 Control room instrument surge protective devices shall be installed in the cabinet.
8.2.3 After the instrument cable enters the control room, it shall be connected to a surge
protective device first, and then to subsequent instruments (including fuse terminals).
8.3 Earthing and bonding for surge protective device
9 Lightning and surge protection for field instrumentation
9.1 Lightning protection for field instrumentation
9.2 Installation for surge protective device
9.2.1 Field instruments shall use fabricated surge protective devices. For instruments
where fabricated surge protective devices cannot be installed, built-in surge protective
devices can be used. The parameters of the surge protective device shall comply with
the provisions of 7.3.Field instruments shall use line-line protection surge protective
devices.
9.3 Field instrumentation earthing
9.3.1 The earthing of field instruments shall be protective earthing. It shall comply with
the requirements of Table 9.3.1.The enclosure earthing terminal or natural earthing
through installation shall be used.
9.3.4 The earth wire of the surge protective device shall be connected to the earth
terminal inside the instrument. At the same time, the earth terminal of the instrument
housing shall be earthed.
9.3.5 Instruments, equipment, instrument boxes, brackets, etc. that need to be earthed
on site can be connected in series. The number of series connections shall be ≤3.
SH/T 3164-2021
SH
PETROCHEMICAL INDUSTRY STANDARD
ICS 91.120.40
P 72
File No.. J3023-2022
Replacing SH/T 3164-2012
Design specification for instrument system lightning surge
protection in petrochemical industry
Issued on. AUGUST 21, 2021
Implemented on. FEBRUARY 01, 2022
Issued by. Ministry of Industry and Information Technology of the People's
Republic of China.
Table of Contents
Foreword... 4
1 Scope... 6
2 Normative references... 6
3 Terms and abbreviations... 6
4 General... 10
5 Decision of lightning surge protection engineering for instrumentation... 10
6 Earthing system in lightning surge protection engineering for instrumentation... 11
7 Surge protective device... 16
8 Surge protection for instrumentation in control room... 19
9 Lightning and surge protection for field instrumentation... 20
10 Lightning and surge protection for cables... 22
11 Surge protection for intrinsic safety system... 24
12 Surge protection for fieldbus system... 25
13 Lightning protection for control building... 27
Appendix A (informative) Network type earthing referenced drawing... 28
Appendix B (informative) Shielding of cables earthing referenced drawing... 30
Bibliography... 34
Explanation of terms used in this Specification... 35
Instructions for revision... 37
1 Scope
This Specification specifies the design rules for lightning protection engineering of
instrument systems.
This Specification is applicable to the lightning protection design of instrument systems
for explosive environments and non-explosive environments in new construction,
expansion and reconstruction projects of petrochemical and coal-based fuel and
chemical product plants.
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 50057-2010, Code for design protection of structures against lightning
GB/T 18802.21, Low-voltage surge protective devices -- Part 21.Surge protective
devices connected to telecommunications and signaling networks -- Performance
requirements and testing methods
3 Terms and abbreviations
3.1 Terms
For the purposes of this document, the following terms and definitions apply.
3.1.1 air-termination system
Metal objects and metal structures used to directly receive or withstand lightning strikes,
such as. lightning rods (formerly known as lightning rods), lightning strips (wires),
lightning nets, etc.
3.1.5 bonding
Connect equipment, instruments, earthing busbars, etc. that need to be earthed with
earthing wires and bonding conductors to form a earthing system.
3.1.6 bonding conductor
A conductor that is used to connect various equipment that need to be earthed, various
bonding bars, etc., to form a earthing system.
3.1.11 lightning electromagnetic induction
The phenomenon that the lightning current generates an electromagnetic field in the
surrounding space and the conductor in this electromagnetic field generates an induced
electromotive force.
3.1.12 electromagnetic shielding
A barrier to the protected target with materials that can reduce the passage of
electromagnetic fields.
3.1.13 lightning surge
The pulse-shaped current and voltage generated by lightning electromagnetic induction
and conducted along a circuit or conductor. It is also called lightning surging.
3.1.14 equipotential bonding
Use conductors to conductively connect various metal components, metal facilities,
metal pipes, metal equipment, etc., so that the potential of each object is approximately
equal.
3.1.27 safety extra-low voltage
The voltage that electrical insulation and isolation from other power systems, voltage
does not exceed the limit. ≤ AC 50V, or ≤ DC 120V, exposed conductive parts are not
earthed, in compliance with GB/T 16895.21-2020/IEC 60364-4-41.2017 on safety
extra-low voltage specified voltage.
3.2 Abbreviations
The following abbreviations apply to this Specification.
4 General
4.1 The design of lightning protection projects shall determine the appropriate
protection scope and adopt appropriate protection plans based on the specific conditions
of the protection targets, so as to reduce the risk of lightning strikes to a tolerable level,
4.2 Lightning surge protection engineering for instrumentation shall adopt the
following methods at the same time.
4.3 The protective earthing, working earthing, intrinsic safety earthing, shielding
earthing, anti-static earthing, and surge protective device earthing of the instrument
shall finally be connected to the electrical earth termination system. The earth resistance
shall comply with the earth resistance of the electrical earth termination system.
5 Decision of lightning surge protection engineering for instrumentation
5.1 The implementation of lightning surge protection engineering for instrumentation
shall be determined based on one of the conditions of 5.2 to 5.6.
Abbreviation Full English name
5.4 When the regulatory authorities or owners assess that the possible economic losses
caused by lightning strikes are greater than the tolerable economic losses, or the
expected risks of lightning strikes are greater than the tolerable risks, lightning surge
protection engineering for instrumentation shall be implemented.
5.5 When the number of lightning strikes with lightning current intensity above 130kA
has occurred in the factory area ≥ 2 times/year, it is appropriate to implement lightning
surge protection engineering for instrumentation.
5.6 Departments with corresponding management or supervision rights may implement
lightning surge protection engineering for instrumentation in accordance with
regulations without evaluation.
6 Earthing system in lightning surge protection engineering for instrumentation
6.1 Instrumentation earthing system in control room
6.1.1 The instrument earthing system in the control room shall adopt a mesh-structured
earthing system, which can be used in various buildings and rooms equipped with
instruments.
6.1.5 For single-row cabinets or single-row consoles, a single bonding bar shall be used.
6.1.6 The bonding bar of the mesh structure shall be made of copper or hot-dip
galvanized flat steel welded with a cross-sectional area of ≥40 mm × 4 mm (width ×
thickness). There shall be no wire connections between bonding bar materials.
6.1.7 The bonding bar of the mesh structure shall be installed on the bottom support of
the cabinet or other brackets. The height shall be close to the bottom of the cabinet, see
Appendix A. The bonding bar shall be installed using non-insulating brackets and other
materials.
6.1.12 The earth wire (PE wire) from the power supply system shall be connected to
the bonding bar of the instrument distribution cabinet. Multi-stranded copper core wires
with a cross-sectional area of ≥16 mm2 shall be connected to the mesh structure bonding
bar by crimping.
6.2 Cabinet and operating console earthing
6.2.1 The working earthing and protective earthing in the cabinet shall be directly
connected to the nearest bonding bar below according to the earthing diagram in Figure
6.2.4 Copper or hot-dip galvanized flat steel with a cross-sectional area of ≥40mm ×
4mm (width × thickness) shall be laid as a bonding bar along the power supply cable
path for instruments, operating equipment, and metal operating desks that need to be
earthed. Metal operating consoles equipped with equipment that require external
earthing shall be connected to the nearest bonding bar according to Figure 6.2.4.
6.2.5 Every instrument, equipment, instrument panel, operating console, etc. that needs
to be earthed shall be connected to a mesh-type bonding bar using a earthing wire. The
number of series connections required shall be ≤3.The cabinet shall not be earthed in a
chained series manner connected by wires.
6.3 Bonding conductor and wire
6.6 Earthing sign
6.6.1 The construction of various earthing wires, bonding conductors, bonding bars, etc.
in the control room shall be easy to inspect and maintain. Visible signs shall be set up.
6.6.2 The connection to the bonding terminal shall be clearly marked.
7 Surge protective device
7.1 General
7.1.1 Surge protective devices shall be maintenance-free. They shall be able to
withstand multiple lightning surges without being damaged.
7.1.4 When the instrument needs to be equipped with a surge protective device, it shall
be configured according to the provisions of 7.2, 7.3, and 7.4.
7.1.5 Surge protective devices with monitoring functions can be used and
corresponding centralized monitoring equipment can be configured.
7.2 Type of surge protective device
7.2.1 Commonly used surge protective devices for instruments include. signal type, DC
24V power supply type, AC or DC 220V power supply type, communication type, etc.
The selection shall be determined based on factors such as protection purpose, signal
type, operating voltage level, installation location, and installation method.
7.2.5 The control system communication network shall be equipped with surge
protective devices according to the communication category. Specifications and
parameters shall be suitable for the connected communication equipment.
7.2.6 Surge protective devices with multiple signal channels shall not be used. For four-
wire instruments powered by DC 24V, since the supply current value is similar to the
signal current value, the power supply line is regarded as a signal channel, and a dual
signal channel surge protective device can be used.
7.3 Parameters of surge protective device for signal type
The basic parameters of surge protective device for signal type shall comply with the
requirements in Table 7.3.
7.5.2 For on-site AC power supply instruments that need to be equipped with surge
protective devices, surge protective devices shall be equipped according to the AC
power supply parameters.
8 Surge protection for instrumentation in control room
8.1 Shielding for instrumentation in control room
8.2 Installation for surge protective device
8.2.1 Control room instrumentation shall be equipped with surge protective devices as
specified in Chapter 7.
8.2.2 Control room instrument surge protective devices shall be installed in the cabinet.
8.2.3 After the instrument cable enters the control room, it shall be connected to a surge
protective device first, and then to subsequent instruments (including fuse terminals).
8.3 Earthing and bonding for surge protective device
9 Lightning and surge protection for field instrumentation
9.1 Lightning protection for field instrumentation
9.2 Installation for surge protective device
9.2.1 Field instruments shall use fabricated surge protective devices. For instruments
where fabricated surge protective devices cannot be installed, built-in surge protective
devices can be used. The parameters of the surge protective device shall comply with
the provisions of 7.3.Field instruments shall use line-line protection surge protective
devices.
9.3 Field instrumentation earthing
9.3.1 The earthing of field instruments shall be protective earthing. It shall comply with
the requirements of Table 9.3.1.The enclosure earthing terminal or natural earthing
through installation shall be used.
9.3.4 The earth wire of the surge protective device shall be connected to the earth
terminal inside the instrument. At the same time, the earth terminal of the instrument
housing shall be earthed.
9.3.5 Instruments, equipment, instrument boxes, brackets, etc. that need to be earthed
on site can be connected in series. The number of series connections shall be ≤3.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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