GB/T 35081-2018Safety of machinery -- Relationship of GB/T 16855.1 to GB/T 15706 (English PDF)

5.1 Overview

For the correct application of GB/T 16855.1, basic input information should be obtained from the overall wind in the design process of a particular machine.

Risk assessment and risk reduction process. Based on these input information, an appropriate control system safety-related part can be designed according to GB/T 16855.1 pieces. Then, according to the overall risk assessment and risk reduction process in GB/T 15706, the details of the safety-related components of the control system will be The information obtained during the process of integrating the design into the machine design is considered. Figure 3 shows the relationship between them.

GB/T 16855.1 5.2 Input information of The following information entered into GB/T 16855.1 is for a specific machine, and the overall risk assessment and risk reduction are carried out according to GB/T 15706 The information obtained in the small process is also the necessary information for the correct application of GB/T 16855.1.

a) According to 5.3 in GB/T 15706-2012, the machine limitations include.

1) usage restrictions;

2) Space constraints;

3) time limit;

4) Other restrictions (eg environmental conditions).

b) According to 5.5.2 in GB/T 15706-2012, the risk associated with a specific hazardous situation depends on the following factors.

1) The severity of the injury.

2) The probability of the damage occurring, which is a function of the following parameters.

i) personnel are exposed to danger;

i) the occurrence of a hazardous event; ii) technical and human possibilities to avoid or limit harm.

These risk elements shall take into account all risk reduction measures (intrinsic safety design, safeguards/protective measures). In the absence of any risk reduction measures (intrinsically safe design, safety guards/protective measures The risk factor is the same as the result obtained in step 1 of the iterative process in GB/T 15706.

Note 1. The occurrence of hazardous events can be caused by technical or human causes. For more instructions, see A.2.3 in GB/T 16855.1-2008.

Note 2. The occurrence of dangerous events and the technical and human possibilities for avoiding or limiting injury can be summarized as the same as those in GB/T 16855.1-2008, Appendix A the parameter P.

When the risk assessment and risk reduction process is carried out according to GB/T 15706, if the risk factor table is used, the risk assessment tool should be The output information matches the performance level table given in GB/T 16855.1. All input information required to select the desired performance level PLr (The risk value of the considered hazardous situation) can be obtained from the overall risk assessment and risk reduction process of GB/T 15706. Therefore, applying In GB/T 16855.1, it is no longer necessary to carry out a separate risk assessment.

Figure A.1 given in GB/T 16855.1-2008 is only suitable for selecting PLr for the safety function and cannot be used for The machine makes an overall risk estimate.

Note 3. Some C standards have given the value of PLr for specific safety functions.

c) expected performance specifications related to risk reduction/protection measures, such as.

1) a general description of the intended function of the risk reduction/protection measure (related to the functional requirements);

2) the specific safety-related characteristics of the risk reduction/protection measures (e.g. response time, mode of operation);

3) description of environmental conditions related to risk reduction/protection measures (e.g. space constraints, temperature, humidity, vibration);

4) Description of other machine and/or process specific conditions [eg specified safety-related elements (sensors, control actuators)].

GB/T 16855.1 5.3 Output information obtained from The following output information of GB/T 16855.1 is obtained from the detailed design of the safety-related control system and is the necessary input of GB/T 15706 information in order to complete the overall risk assessment and risk reduction process.

a) The results of verification and validation in accordance with GB/T 16855.1 and GB/T 16855.2 are used to prove that the expected risk reduction has been This is achieved through selected risk reduction measures.

b) Meets Chapter 10 of GB/T 16855.1-2008, technical documentation for integrating technical solutions into machine design.

c) Satisfy the use information in Chapter 11 of GB/T 16855.1-2008 (to ensure the correct use of the control system safety-related components and Relevant risk reduction/protection measures, relevant information provided by the machine designer to the machine user).