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SH/T 3164-2021: Design specification for instrument system lightning surge protection in petrochemical industry
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
3.1 Terms... 6
3.2 Abbreviations... 9
4 General... 10
5 Decision of lightning surge protection engineering for instrumentation... 10
6 Earthing system in lightning surge protection engineering for instrumentation... 11
6.1 Instrumentation earthing system in control room... 11
6.2 Cabinet and operating console earthing... 13
6.3 Bonding conductor and wire... 14
6.4 Laying of cables and wire... 15
6.5 Bonding method... 15
6.6 Earthing sign... 16
7 Surge protective device... 16
7.1 General... 16
7.2 Type of surge protective device... 16
7.3 Parameters of surge protective device for signal type... 17
7.4 Surge protective device application... 18
7.5 Surge protection in AC power supply... 19
8 Surge protection for instrumentation in control room... 19
8.1 Shielding for instrumentation in control room... 19
8.2 Installation for surge protective device... 19
8.3 Earthing and bonding for surge protective device... 20
9 Lightning and surge protection for field instrumentation... 20
9.1 Lightning protection for field instrumentation... 20
9.2 Installation for surge protective device... 20
9.3 Field instrumentation earthing... 21
10 Lightning and surge protection for cables... 22
10.1 Shielding of cables... 22
10.2 Earthing for cable shielding... 22
10.3 Spare cable and spare core of cable... 24
11 Surge protection for intrinsic safety system... 24
11.1 Surge protective device for intrinsic safety system... 24
11.2 Installation for surge protective device... 25
11.3 Bonding in intrinsic safety system... 25
12 Surge protection for fieldbus system... 25
12.1 Surge protective device for fieldbus system... 25
12.2 Surge protective device application... 26
12.3 Fieldbus system earthing... 27
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... 39
3 Terms and abbreviations... 39
4 General... 39
5 Decision of lightning surge protection engineering for instrumentation... 40
6 Earthing system in lightning surge protection engineering for instrumentation... 42
7 Surge protective device... 44
8 Surge protection for instrumentation in control room... 47
9 Lightning and surge protection for field instrumentation... 47
10 Lightning and surge protection for cables... 49
11 Surge protection for intrinsic safety system... 49
12 Surge protection for fieldbus system... 50
13 Lightning protection for control building... 50
Design specification for instrument system lightning surge
protection in petrochemical industry
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.
3.1.2 down conductor system
Conductor connecting the air-termination system to the earth termination system.
5.2 When a building is set up with lightning protection according to Chapter 3 of GB
50057-2010, and instruments are installed inside, especially if it has outdoor signal lines,
lightning surge protection engineering for instrumentation shall be implemented to
prevent outdoor signal lines from introducing lightning into the room and damaging
electronic equipment, endanger personal safety.
5.3 Factory areas where personnel have been injured by lightning strikes or lightning
strikes that have endangered production safety shall implement lightning surge
protection engineering for instrumentation.
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. The number of lightning strikes and
lightning current intensity can be determined based on data from the local
meteorological department or self-measurement results.
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.
6.1.2 The protective earthing, working earthing, intrinsic safety earthing, shielding
earthing, anti-static earthing, surge protective device earthing, etc. of the control room
shall be connected to a unified mesh structure earthing system nearby. The mesh
structure earthing system shall not distinguish between earthing types.
6.1.3 The mesh structure shall be in the form of multiple bonding bars connected into a
grid. The bonding bar shall be arranged according to the arrangement of instrument
cabinets and operating consoles, under the movable floor, in the cable trench, or in a
suitable space under all cabinets and operating consoles that need to be earthed.
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.
7.1.2 Surge protective devices shall be inspected for parameters and performance on a
batch-by-batch basis, and shall have an inspection certificate. The manufacturer of
surge protective devices shall have simulation surge testing equipment with lightning
standard test waveforms. Inspection shall be carried out by the manufacturer in
accordance with GB/T 18802.21 or manufacturer's standards.
7.1.3 Units or institutions that do not have simulation surge test and inspection
equipment with lightning standard test waveforms are not allowed to carry out any form
or performance inspection, certification and issue certificates other than CCC
certification.
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.
7.2.2 Two-wire, three-wire, four-wire 4mA ~ 20mA signal meters or other signal type
meters, as well as 24V DC circuits that power a single outdoor meter shall be equipped
with surge protective devices according to the signal type.
7.2.3 DC 24V power supply devices with power supply input lines with an outdoor
overhead length exceeding 100 m shall be equipped with surge protective devices in
h) Other instruments that are sensitive to lightning surges or cannot withstand
lightning surges.
7.4.5 Instruments that do not need surge protective devices.
a) Thermocouple;
b) Mechanical contact switches and buttons;
c) Instruments that are not electric or not related to electrical signals;
d) Other instruments capable of withstanding lightning surges.
7.5 Surge protection in AC power supply
7.5.1 The lightning protection design and surge protective device configuration of AC
power supply equipment shall comply with the provisions of Articles 6.4.4~6.4.7 of GB
50057-2010.
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
8.1.1 Control room instruments shall be installed in steel cabinets or metal casings.
Separate components such as the door, top, bottom, and side panels of the cabinet shall
be conductively connected using insulated multi-stranded copper wires with a cross-
sectional area of ≥2.5 mm2 or other effective methods.
8.1.2 The cabinet shall be equipped with a protective bonding bar connected to the
cabinet body, and shall be connected to the nearest bonding bar below the cabinet.
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
8.3.1 The surge protective device installed in the control room shall be installed on a
metal rail. The rail shall be used as a bonding bar (trip).
8.3.2 For special surge protective devices that do not use metal rails as bonding bars
(trips), a bonding bar (trip) shall be provided.
8.3.3 The surge protective device earth rail or bonding bar (trip) shall be connected to
the bonding bar under the cabinet or to the protective bonding bar (trip) inside the
cabinet.
9 Lightning and surge protection for field instrumentation
9.1 Lightning protection for field instrumentation
9.1.1 The instrument shall avoid being installed on the top or protruding position of
outdoor equipment, platforms, buildings and other objects to become a lightning-
receiving object.
9.1.2 When the installation position of the instrument may cause the instrument to form
a lightning contact object and cannot be moved, the instrument shall be installed in a
steel protective box or protective cover. The box or protective cover shall be earthed.
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.
9.2.2 The prefabricated surge protective device shall be in the form of a sealed thread
and installed at the vacant line inlet of the field instrument body or the tee interface
provided outside the line inlet. The external tee interface shall adopt a sealed thread
installation structure.
9.2.3 The wiring of the fabricated surge protective device shall be as short as possible.
No excess wire shall be left or crimped.
9.2.4 The surge protective device assembled with explosion-proof instruments shall not
change the explosion-proof structure and explosion-proof performance of the
instrument body. The explosion-proof surge protective device installed on the
instrument inlet shall pass the national compulsory product certification (CCC
connected to protective earthing at both ends. When the cable trough is long, multiple
earthing points shall be repeated, and the distance between earthing points shall be ≤30
m.
10.2.12 The inner shield of the cable shall be insulated from other conductors when
connected in the junction box. Unearthed shield ends shall be insulated.
10.2.13 The metal armor layer terminal of the armored optical cable shall use an
armored connector with a earth wire. A protective earth shall be connected to the optical
cable terminal. The metal core and protective layer in the optical cable shall be
connected to protective earthing at the terminal.
10.2.14...