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GB/T 50770-2013 English PDF

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GB/T 50770-2013: Code for design of safety instrumented system in petrochemical engineering
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GB/T 50770-2013English1569 Add to Cart 10 days [Need to translate] Code for design of safety instrumented system in petrochemical engineering Valid GB/T 50770-2013

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Basic data

Standard ID GB/T 50770-2013 (GB/T50770-2013)
Description (Translated English) Code for design of safety instrumented system in petrochemical engineering
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard P72
Classification of International Standard 75.020
Word Count Estimation 71,767
Quoted Standard GB/T 20438; GB/T 21109
Regulation (derived from) Announcement of the Ministry of Housing and Urban No. 1623
Issuing agency(ies) Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Summary This standard applies to: petrochemical plant or equipment construction, expansion and renovation project Safety Instrumented Systems engineering design.

GB/T 50770-2013: Code for design of safety instrumented system in petrochemical engineering

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General 1.0.1 This specification is formulated to prevent and reduce process risks in petrochemical plants or installations, ensure personal and property safety, and protect the environment. 1.0.2 This specification is applicable to the engineering design of safety instrumented systems for new construction, expansion and reconstruction projects of petrochemical plants or devices. 1.0.3 The engineering design of the petrochemical safety instrument system shall not only comply with this specification, but also comply with the current relevant national standards. 2 Terms and abbreviations 2.1 Terminology 2.1.1 safety instrumented system safety instrumented system An instrumented system that implements one or more safety instrumented functions. 2.1.2 risk Specific hazardous events and consequences that are expected to occur. 2.1.3 process risk process risk Risk arising from changes in process conditions caused by abnormal events. 2.1.4 safety life cycle safety life cycle The total time from the start of engineering scheme design to the decommissioning of all safety instrumented functions. 2.1.5 Hazard The possibility of causing personal injury or illness, property damage, environmental damage, etc. 2.1.6 risk assessment risk assessment The whole process of assessing the size of the risk and determining the tolerance level of the risk. 2.1.7 protection layer protection layer Measures to reduce risks through control, prevention, mitigation, etc. 2.1.8 safety function safety function Functions performed by safety instrumented systems, other safety-related systems or external risk reduction facilities in order to achieve or maintain a safe state for a process. 2.1.9 Safety instrumented function safety instrumented function In order to prevent and reduce the occurrence of dangerous events or maintain a safe state of the process, the safety protection function or safety control function realized by measuring instruments, logic controllers, final components and related software. 2.1.10 fault fault An abnormal condition that results in a reduction or loss of the ability of a functional unit to perform. 2.1.11 safety integrity safety integrity The average probability that a safety instrumented system completes a safety instrumented function within specified conditions and time. 2.1.12 Safety integrity level safety integrity level The level of the security function. The safety integrity level is SIL1~SIL4 from low to high. 2.1.13 failure failure Functional Unit Termination of a certain function or ability to perform. 2.1.14 Dangerous failure dangerous failure A failure that could result in a potential hazard or loss of function of a safety instrumented system. 2.1.15 safe failure safe failure A failure that is unlikely to result in a potential hazard or loss of function of the safety instrumented system. 2.1.16 Measuring instrument sensor A component of a safety instrumented system, a device used to measure process variables. 2.1.17 logic controller logic solver A component of a safety instrumented system, a device that performs logic functions. 2.1.18 final element final element A component of a safety instrumented system is a device that executes the actions commanded or set by the logic controller to make the process reach a safe state. 2.1.19 basic process control system basic process control system In response to the input signals of process measurement and other related equipment, other instruments, control systems or operators, according to process control laws, algorithms and methods, output signals are generated to realize process control and related equipment operation. 2.1.20 fail safe fail safe When the safety instrumented system fails, the controlled process is transferred to a predetermined safe state. 2.1.21 Redundancy redundancy Two or more components or systems that independently perform the same function are used as backup and switching for each other. 2.1.22 fault tolerant The ability of a functional unit to continue to perform a specified function in the event of a fault or error. 2.1.23 Switch digital variable A variable with only two values of 0 or 1 is used to represent the state of things or events. Also known as a numeric variable. 2.1.24 switch switch A state device with two stable positions. There are software switches and hardware switches. 2.1.25 button push button There is only one state device in a stable position. There are software buttons and hardware buttons. 2.1.26 contact mechanical contact A mechanical electrical device consisting of conductive metal elements. Under the action of external factors, the conduction state can be changed on or off. 2.1.27 Contact An electrical device that can change the on or off state of conduction under the action of external factors. There are mechanical and electronic. There are also software contacts in the arithmetic unit of the programmable logic controller. 2.1.28 Normally closed contact normally closed contact A contact that is naturally closed when there is no external influence. 2.1.29 normally open contact normally open contact A contact that is naturally disconnected when there is no external influence. 2.1.30 programmable electronic system programmable electronic system A system for control, protection or monitoring based on electronic equipment that can program or change operating programs according to functional needs. 2.2 Abbreviations BPCS (Basic Process Control System) basic process control system CPU(Central Process Unit) central processing unit EMC (Electro-Magnetic Compatibility) electromagnetic compatibility FAT (Factory Acceptance Testing) factory acceptance test FLD (Functional Logic Diagram) Functional Logic Diagram FBD(Functional Block Diagram) function block diagram FDS (Functional Design Specification) Functional Design Regulations HAZOP (Hazard and Operability Study) Hazard and operability study HMI (Human Machine Interface) human-machine interface HSE (Health, Safety and Environment) health, safety and environmental protection MOS (Maintenance Override Switch) maintenance bypass switch OOS (Operational Override Switch) operation bypass switch PES (Programmable Electronic System) Programmable Electronic System PHA (Preliminary Hazard Analysis) Preliminary Hazard Analysis PFDavg (Probability of Failure on Demand Average) average failure probability of low demand mode PLC (Programmable Logic Controller) Programmable Logic Controller SAT (Site Acceptance Testing) site acceptance test SER (Sequence Event Recorder) event sequence record SIF (Safety Instrumented Function) Safety Instrumented Function SIL (Safety Integrity Level) safety integrity level SIS (Safety Instrumented System) safety instrumented system UPS(Uninterruptable Power Supply) uninterruptible power supply

3 Security life cycle

3.1 General provisions 3.1.1 In the engineering design of petrochemical plants or installations, the management activities required for each stage of the safety life cycle of safety instrumented systems shall be determined. 3.1.2 The safety life cycle should be divided into engineering design phase, integration debugging and acceptance testing phase and operation and maintenance phase. 3.1.3 Safety life cycle work (Figure 3.1.3) should include engineering scheme design, process hazard analysis and risk assessment, safety function assignment of protection layer, safety integrity level assessment and review, safety instrumented system technical requirements, safety instrumented system Basic engineering design, detailed engineering design of safety instrumented system, integration, commissioning and acceptance test of safety instrumented system, operation maintenance and change of safety instrumented system, function test of safety instrumented system, decommissioning of safety instrumented system, etc. Figure 3.1.3 Security lifecycle workflow 3.2 Engineering design 3.2.1 The engineering scheme design should include preliminary process risk analysis, main safety control strategies and measures and corresponding descriptions. 3.2.2 Process hazard analysis and risk assessment should include identification of hazardous events and causes of the process and related equipment, sequence, possibility and consequences of hazardous events, determination of risk reduction requirements and measures, and determination of safety instrument functions. Process hazard analysis and risk assessment should adopt hazard and operability research methods or pre-hazard analysis methods, and safety checklists, failure mode and effect analysis, and causal analysis methods can also be used. 3.2.3 The assignment of protection layer safety functions may include the assignment of protection layer safety functions for preventing, controlling or mitigating process hazards, and the assignment of risk reduction objectives for safety instrumented functions. The safety function allocation of the protection layer should comply with the relevant provisions of the current national standards "Functional Safety of Electrical/Electronic/Programmable Electronic Safety-Related Systems" GB/T 20438 and "Functional Safety of Safety Instrumented Systems in the Process Industry Field" GB/T 21109. 3.2.4 The safety integrity level can be evaluated and determined according to the results of process hazard analysis and protection layer function assignment. 3.2.5 Safety instrumented system technical requirements may include safety instrumented functions and safety integrity level, process safety status, operation mode, inspection and test interval time, etc. 3.2.6 The basic engineering design of the safety instrumented system should include safety instrumented system design description, safety instrumented system specification, safety interlock cause and effect table or function description, etc. 3.2.7 The detailed engineering design of the safety instrumented system should include safety instrumented system design description, safety instrumented system specification, function logic diagram, configuration programming, etc. 3.3 Integration, debugging and acceptance testing 3.3.1 The safety instrumented system integration, commissioning and acceptance test shall meet the technical requirements of safety instrumented system specifications and functional logic diagrams. 3.3.2 The commissioning results of the safety instrumented system shall meet the technical requirements of the safety instrumented system. 3.3.3 The safety instrumented system acceptance test shall include factory acceptance and field acceptance. Safety instrumented system hardware, system software and application software, etc., shall meet the technical requirements of safety instrumented systems. 3.4 Operation and maintenance 3.4.1 Operation and maintenance should follow the operation and maintenance procedures, and the operation and maintenance process should meet the functional safety of safety instrumented system technical requirements. 3.4.2 The modification or change of the hardware and application software of the safety instrumented system shall comply with the change modification procedure, and shall be authorized and approved according to the approval procedure. The safety integrity level of the design shall not be changed, and the change record shall be kept. 3.4.3 Operation and maintenance personnel should be trained regularly, and the training content should include the functions of safety instrumented systems, preventable process hazards, measuring instruments and final components, logic actions of safety instrumented systems, alarms of safety instrumented systems and process variables, safety instrument Processing after system operation, etc. 3.4.4 The functional test interval shall be determined according to the technical requirements of the safety instrumented system, and the functional test shall be carried out according to the test procedure. 3.4.5 The decommissioning of safety instrumented systems shall be reviewed and approved. The safety instrumented system update shall formulate an update procedure. The updated safety instrumented system should be able to realize the specified safety instrumented functions.

4 Safety integrity level

4.1 General provisions 4.1.1 Safety integrity should include hardware safety integrity and system safety integrity. 4.1.2 Safety integrity level can be divided into SIL 1, SIL 2, SIL 3, SIL 4. 4.1.3 In the low-demand operation mode, the safety integrity level of the safety instrumented function shall be measured by the average failure probability, which should be determined according to Table 4.1.3. Table 4.1.3 Safety Integrity Levels of Safety Instrumented Functions (Low Requirement Mode of Operation) 4.1.4 In the high-demand operation mode, the safety integrity level of the safety instrument function shall be measured by the frequency of dangerous failure per hour, which should be determined according to Table 4.1.4. Table 4.1.4 Safety Integrity Levels of Safety Instrumented Functions (High Demand Mode of Operation) 4.2 Safety Integrity Level Assessment 4.2.1 The safety integrity level assessment should include the following contents. 1 determine the safety integrity level of each safety instrumented function; 2 Determine diagnostics, maintenance and testing requirements, etc. 4.2.2 The safety integrity level assessment method should be determined according to the complexity of the process, current national standards, risk characteristics, risk reduction methods, and personnel experience. The main methods should include layer of protection analysis, risk matrix method, corrected risk map method, empirical method and other methods. 4.2.3 The evaluation of safety integrity level should adopt the method of review meeting. The main documents to be reviewed should include process piping and instrument flow charts, process instructions, device and equipment layout drawings, hazardous area division drawings, safety interlock cause-and-effect tables and other relevant documents. The main personnel participating in the evaluation should include technology, process control (instrument), safety, equipment, production operation and management, etc.

5 basic principles of design

5.0.1 The engineering design of the safety instrumented system shall meet the requirements of the safety instrument function and safety integrity level of the petrochemical plant or device. 5.0.2 The engineering design of the safety instrumented system should take into account the reliability, usability, maintainability, traceability and economy, and should prevent insufficient or over-design. 5.0.3 The safety instrumented system shall consist of measuring instruments, logic controllers and final components. 5.0.4 The function of the safety instrumented system shall be determined according to the requirements of process risk and operability analysis, safety protection of personnel, process, equipment and environment, and safety integrity level. 5.0.5 The safety integrity level of petrochemical plants or devices should not be higher than SIL 3. 5.0.6 The safety instrumented system shall meet the safety integrity level requirements. The safety integrity level can be determined by calculating the failure probability of the safety instrumented system. 5.0.7 A safety instrumented system can realize one or more safety instrumented functions, and multiple safety instrumented functions can use the same safety instrumented system. When multiple safety instrumented functions are implemented in the same safety instrumented system, the common parts in the system shall meet the highest safety integrity level requirements of each function. 5.0.8 The safety instrumented system should be independent from the basic process control system, and should independently complete the safety instrumented function. 5.0.9 The safety instrumented system should not intervene or replace the work of the basic process control system. 5.0.10 The basic process control system should not interfere with the operation or logical operation of the safety instrumented system. 5.0.11 The safety instrumented system shall be designed as a fail-safe type. When a fault occurs in the safety instrumented system, the safety instrumented system should be able to transfer the process to a safe state according to the design predetermined method. 5.0.12 The logic controller of safety instrumented system should have hardware and software self-diagnosis function. 5.0.13 There should be few intermediate links in the safety instrumented system. 5.0.14 The central processing unit, input and output unit, communication unit and power supply unit of the logic controller shall adopt redundant technology. 5.0.15 The safety instrumented system shall implement the system lightning protection project according to the current relevant national lightning protection standards. 5.0.16 The AC power supply of the safety instrumented system should adopt the power supply mode of two-way uninterruptible power supply. 5.0.17 The grounding of the safety instrument system shall adopt the equipotential connection method. 5.0.18 The hardware, operating system and programming software of the safety instrumented system shall adopt the officially released version. 5.0.19 Documents such as safety instrumented system software, programming, upgrade or modification shall be backed up. 5.0.20 The equipment in the safety instrumented system should be set with the same clock. 5.0.21 When multiple sets of safety instrumented systems are installed in large-scale petrochemical projects, each system should be able to work independently. 5.0.22 When there may be dangerous interference signals from outside in the input and output signal lines of the safety instrumented system, isolation measures such as isolators and relays should be taken.

6 Measuring instruments

6.1 General provisions 6.1.1 Measuring instruments include analog measuring instruments and switching measuring instruments. Safety instrumented systems should use analog measuring instruments. 6.1.2 The measuring instrument should adopt the intelligent transmitter with 4mA～20mA superimposed HART transmission signal. 6.1.3 In explosion-hazardous places, measuring instruments should be flameproof or intrinsically safe. When using an intrinsically safe system, an isolated safety barrier should be used. 6.1.4 The degree of protection of measuring instruments installed on site shall not be lower than IP65. 6.1.5 Measuring instruments should not use fieldbus or other communication methods as the input signal of the safety instrumented system. 6.1.6 Measuring instruments and source points should be set independently. 6.1.7 The performance and setting of measuring instruments should meet the requirements of safety integrity level. 6.2 Individual setting of measuring instruments 6.2.1 SIL 1 safety instrument function, the measuring instrument can be shared with the basic process control system. 6.2.2 For SIL 2 safety instrument functions, the measuring instruments should be separated from the basic process control system. 6.2.3 For SIL 3 safety instrumented functions, the measuring instruments shall be separated from the basic process control system. 6.3 Redundant setup of measuring instruments 6.3.1 For SIL 1 safety instrument functions, a single measuring instrument may be used. 6.3.2 For SIL 2 safety instrument functions, redundant measuring instruments should be used. 6.3.3 For SIL 3 safety instrument functions, redundant measuring instruments shall be used. 6.4 Redundancy of measuring instruments 6.4.1 When the system requires high security, the "or" logic structure should be adopted. 6.4.2 When the system requires high availability, the logical structure of "AND" should be adopted. 6.4.3 When the system needs to take into account both high security and high availability, it is advisable to adopt a logical structure of two out of three. 6.5 Switching measuring instruments 6.5.1 Switching measuring instruments may include process variable switches, manual switches, buttons, relay contacts, etc. 6.5.2 For the switching measuring instrument used for emergency stop, the contacts should be in closed state under normal working conditions; the contacts should be in disconnected state under abnormal working conditions. 6.5.3 Important input circuits should be equipped with line open circuit and short circuit fault detection. The open circuit and short circuit faults of the input circuit should be alarmed and recorded in the safety instrumented system.

7 final components

7.1 General provisions 7.1.1 The final components should include control valves (regulating valves, shut-off valves), solenoid valves, motors, etc. 7.1.2 Pneumatic control valves should be used for final components, and electric control valves should not be used. 7.1.3 The configuration of final components should meet the requirements of safety integrity level. 7.2 Independent setting of control valves 7.2.1 For safety instrumented functions of SIL 1, the control valve can be shared with the basic process control system, and the action priority of the safety instrumented system shall be ensured. 7.2.2 For SIL 2 safety instrumented functions, the control valve should be separated from the basic process control system. 7.2.3 For SIL 3 safety instrumented functions, the control valve shall be separated from the basic process control system. 7.3 Redundant setup of control valves 7.3.1 For SIL 1 safety instrumented functions, a single control valve may be used. 7.3.2 For SIL 2 safety instrument functions, redundant control valves should be used. 7.3.3 For SIL 3 safety instrument functions, redundant control valves shall be used. 7.3.4 The redundancy mode of control valves may adopt one regulating valve and one shut-off valve, or two shut-off valves. 7.4 Configuration of Control Valve Accessories 7.4.1 The solenoid valve of the regulating valve belt shall be installed between the valve positioner and the actuator. The solenoid valve that cuts off the valve belt should be installed on the actuator. 7.4.2 In explosion-hazardous places, solenoid valves and valve position switches should be flameproof or intrinsically safe. When the intrinsically safe type is used, an isolated safety barrier should be used. 7.4.3 The degree of protection of solenoid valves and position switches installed on site shall not be lower than IP 65. 7.4.4 The solenoid valve should adopt 24VDC long-term excitation type, and the power supply of the solenoid valve should be provided by the safety instrument system. 7.4.5 When the system requires high security, the redundant solenoid valve should adopt the "or" logic structure; when the system requires high availability, the redundant solenoid valve should adopt the "and" logic structure.

8 logic controller

8.1 General provisions 8.1.1 Logic controller should adopt programmable electronic system. For occasions with fewer input and output points and simple logic functions, the logic controller can use a relay system. The logic controller can also be composed of a mixture of programmable electronic systems and relay systems. 8.1.2 The programmable electronic system used for the logic controller shall obtain the functional safety certification of the national authority. 8.1.3 The response time of the logic controller should include the input and output scanning processing time and the computing time of the central processing unit, which should be 100ms~300ms. 8.1.4 The central processing unit load of the logic controller shall not exceed 50%. 8.1.5 The internal communication load of the logic controller should not exceed 50%, and the communication load using Ethernet should not exceed 20%. 8.2 Independent setup of the logic controller 8.2.1 For SIL 1 safety instrumented functions, the logic controller should be separated from the basic process control system. 8.2.2 For SIL 2 safety instrumented functions, the logic controller shall be separated from the basic process control system. 8.2.3 For SIL 3 safety instrumented functions, the logic controller shall be separated from the basic process control system. 8.3 Redundancy settings for logic controllers 8.3.1 For SIL 1 safety instrumented functions, redundant logic controllers may be used. 8.3.2 For SIL 2 safety instrument functions, redundant logic controllers should be used. 8...

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