Installation specification for combustible gas detection probe: The application of combustible gas detection probe has corresponding specifications, which must be strictly followed.The details are as follows: Code for installation of combustible gas and toxic gas detection and alarm instrument. Code for use. Design code 1.0.1 In order to ensure the production safety and / or personal safety of petrochemical enterprises, detect the concentration of leaked combustible gas or toxic gas and alarm in time to prevent fire and explosion and / or personal accidents, this specification is hereby formulated 1.0.2 This specification is applicable to the detection and alarm design of combustible gas and toxic gas leaked from petrochemical enterprises 1.0.3 When implementing this specification, it shall also comply with the provisions of the current mandatory standards and specifications 2 Term, symbol 2.1 term 2.1.1 Combustible gas Combustible gas in this specification refers to class a gas or liquefied hydrocarbon with the lower explosion limit concentration (v%) less than 10% or the difference between the upper explosion limit and the lower explosion limit greater than 20%. Class A, B and B combustible liquid formed after gasification or containing a small amount of toxic gas 2.1.2 Toxic gas The toxic gas system in this specification refers to hydrogen sulfide, hydrogen cyanide, chlorine, carbon monoxide, acrylonitrile, ethylene oxide and vinyl chloride 2.1.3 Maximum allowable concentration It refers to the maximum allowable concentration of harmful substances in the air of the workplace, that is, the value that the harmful substances in the air of the workplace should not exceed. This value is also called the upper limit 2.2 Symbol 2.2.1 LEL combustible gas explosion lower limit concentration (v%) 2.2.2 maximum allowable concentration of harmful substances in the air of TLV workshop 3 general provisions 3.0.1 In zone 2 and additional zone 2 of process units and storage and transportation facilities (including class a gas and liquefied hydrocarbon, tank area of class A and B liquid, loading and unloading facilities, filling station, etc., the same below) for production or use of combustible gas, combustible gas detector and alarm shall be set according to this specification Toxic gas detection and alarm apparatus shall be set in the area of process units and storage and transportation facilities producing or using toxic gas according to this specification 1 Once the combustible gas or toxic gas is leaked, the combustible gas may reach 25% LEL, but if the toxic gas cannot reach the maximum allowable concentration, the combustible gas detection alarm shall be set; 2 In case of leakage of toxic gas or combustible gas contained in it, the toxic gas may reach the maximum allowable concentration, but the combustible gas cannot reach 25% LEL, a toxic gas detection alarm shall be set; 3 It is not only a combustible gas but also a toxic gas, and only a toxic gas detection and alarm device is provided; 4 Where combustible gas and toxic gas exist at the same time, combustible gas and toxic gas detection alarm shall be set at the same time Note: for the division of zone 2 and additional zone 2, please refer to gb50058 code for design of electrical installations in explosion and fire hazard environment 3.0.2 Combustible gas and toxic gas detection alarm shall be level I or level II alarm. Conventional detection alarm shall be level I alarm. When the process needs to adopt interlocking protection system, level I alarm and level II alarm shall be adopted. At the same time of level II alarm, output contact signal for the use of interlocking protection system 3.0.3 In hazardous areas where the process has special needs or where personnel are not allowed to enter during normal operation, the combustible gas and / or toxic gas release sources shall be continuously detected, indicated and alarmed, and the alarm shall be recorded or printed 3.0.4 The alarm signal shall be sent to the control room or operation room where the process unit, storage and transportation facilities and other operators are resident 3.0.5 The combustible gas detection and alarm device must be certified by the national designated agency and authorized inspection unit for the manufacture of measuring instruments, explosion-proof performance certification and fire protection certification. The toxic gas detection and alarm device must be certified by the national design

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