GB/T 50770-2013 in English

1 General provisions

1.0.1 This code is formulated in order to prevent and reduce the process risks of petrochemical plants or devices, ensure personal and property safety and protect the environment.

1.0.2 This code is applicable to the design of safety instrumented system for construction, renovation and extension of petrochemical plants or devices.

1.0.3 The design of safety instrumented system in petrochemical engineering shall not only meet the requirements of this code, but also meet those of current standards of the nation.

2 Terms and abbreviations

2.1 Terms

2.1.1
safety instrumented system
instrumented system for realizing one or several safety instrumented function

2.1.2
risk
anticipated specific hazardous events and consequences that may occur.

2.1.3
process risk
risks arising from changes in process conditions caused by abnormal events.

2.1.4
safety life cycle
the time used from the design of the engineering scheme to the end of all safety instrumented functions.

2.1.5
hazard
something which has the potential to cause personal injury or disease, property loss, environmental damage, etc.

2.1.6
risk assessment
overall process to assess the risk and determine the extent to which the risk is accepted.

2.1.7
protection layer
measures to reduce risks by means of control, prevention and mitigation.

2.1.8
safety function
functions achieved by the safety instrumented system, other safety-related systems or external risk reduction facilities in order to achieve or maintain the safe state of the process.

2.1.9
safety instrumented function
safety protection function or safety control function realized by sensor, logic solver, final elements and related software, etc. in order to prevent and reduce the occurrence of dangerous events or maintain the safe state of the process.

2.1.10
fault
abnormal condition that may lead to a reduction or loss of the execution capability of a functional unit.

2.1.11
safety integrity
average probability that the safety instrumented system will complete the safety instrumented function under the specified conditions within the specified time.

2.1.12
safety integrity level
level of safety function. The safety integrity level is from the lowest level SIL1 to the highest level SIL4.

2.1.13
failure
termination of a function or execution capability of a functional unit.

2.1.14
dangerous failure
failure which brings the safety instrumented system into potential danger or loss of function.

2.1.15
safe failure
failure which impossibly brings the safety instrumented system into potential danger or loss of function.

Foreword i
1 General provisions
2 Terms and abbreviations
2.1 Terms
2.2 Abbreviations
3 Safety life cycle
3.1 General requirement
3.2 Engineering design
3.3 Integration, debugging and acceptance test
3.4 Operation and maintenance
4 Safety integrity level
4.1 General requirements
4.2 Safety integrity level assessment
5 General requirements for design
6 Sensor
6.1 General requirement
6.2 Separation requirements for sensor
6.3 Redundancy requirements for sensor
6.4 Redundancy methods of sensor
6.5 Digital sensor
7 Final element
7.1 General requirement
7.2 Separation requirements for control valve
7.3 Redundancy requirements for control valve
7.4 Setting requirements for control value accessory
8 Logic solver
8.1 General requirement
8.2 Separation requirements for logic solver
8.3 Redundancy requirements for logic solver
8.4 Setting requirements for logic solver
8.5 Setting requirements for logic solver interface
9 Communication interface
9.1 General requirement
9.2 Setting requirements for communication interface
10 Human machine interface
10.1 Operation station
10.2 Auxiliary console
10.3 Maintenance override switch
10.4 Operational override switch
10.5 Reset push button
10.6 Emergency shut-down button
10.7 Engineering workstation and sequence event recorder
11 Application software
11.1 Configuration and programming
11.2 Safety of application software
11.3 Application software design and configuration
12 Engineering design
12.1 Basic engineering design
12.2 Detailed engineering design
13 Configuration, integration and debugging, acceptance test
13.1 Configuration, integration and debugging
13.2 Acceptance test
14 Operation and maintenance, change management
15 Documentation
Explanation of wording in this code
List of quoted standards