Detail of GB 25972-2010

Introduction of GB 25972-2010

1 Scope This standard specifies the terms and definitions, model preparation method, requirements, test methods, inspection rules, preparation requirements for operating instructions, and filling requirements for fire extinguishing agent for gas fire extinguishing systems and components. This standard is applicable to heptafluoropropane (HFC227ea) fire extinguishing system, trifluoromethane (HFC23) fire extinguishing system, and inert gas fire extinguishing system [including: IG01 (argon) fire extinguishing system, IG100 (nitrogen) fire extinguishing system, IG55 (argon and nitrogen) Fire extinguishing system, IG541 (argon, nitrogen and carbon dioxide) fire extinguishing system]. 2 Normative references The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document applies. GB 150 Steel pressure vessels GB 5099 Seamless steel gas cylinders (GB 5099-1994, neq ISO 4705:1983) GB 5100 Welded steel gas cylinders (GB 5100-1994, neq ISO 4706:1989) GB/T 8979 Pure nitrogen and high purity nitrogen and ultra pure nitrogen GB/T 9969 General principles for preparation of instructions for use of industrial products GB 18614 Fire extinguishing agent heptafluoropropane (HFC227ea) GB 20128 Inert fire extinguishing agent (GB 20128-2006, ISO 14520:2005, NEQ) GA 61 General technical specifications of actuating and control devices of fixed extinguishing systems 3 Terms and definitions For the purpose of this standard, the following terms and definitions apply. 3.1 system working pressure pressure at the outlet of vessel valve on fire extinguishing agent cylinder set Note: If the vessel valve on the fire extinguishing agent cylinder set does not have the pressure reducing function, the working pressure of the system is the working pressure of the cylinder set. If the vessel valve on the fire extinguishing agent cylinder set has the pressure reducing function, the working pressure of the system is the pressure at the outlet of the vessel valve after the pressure is reduced. 3.2 filling density ratio of the mass of the fire extinguishing agent in storage vessel to the volume of the vessel, expressed in kg/m3 3.3 compressed inert gaseous fire extinguishing system fire extinguishing system in which the fire extinguishing agent in the fire extinguishing agent cylinder set is transported by its own pressure 3.4 stored pressure gaseous fire extinguishing system fire extinguishing system in which the fire extinguishing agent is pressurized and stored with inert gas in the cylinder set, and is transported by the pressurized gas in the cylinder set when the system is operating 3.5 storage pressure equilibrium pressure in the storage vessel which is filled with fire extinguishing agent per the maximum filling density (or the maximum filling pressure) and is placed at +20℃, with respect to compressed inert gaseous fire extinguishing system equilibrium pressure in the storage vessel which is filled with fire extinguishing agent per the maximum filling density and is placed at +20℃, with respect to stored pressure gaseous fire extinguishing system equilibrium pressure in the storage vessel which is filled with gas per the maximum filling pressure or filling density and is placed at +20℃, with respect to expellant gas cylinder set 3.6 maximum working pressure

Contents of GB 25972-2010

Foreword I 1 Scope 2 Normative references 3 Terms and definitions 4 Model preparation method 5 Requirements 7 Inspection rules 8 Preparation requirements for operating instructions 9 Filling of fire extinguishing agent Annex A (Informative) Preparation method for component model Annex B (Informative) Fire extinguishing concentration for Class B n-heptane fire and Class A wood crib surface fire Annex C (Informative) Test method for determination of fire extinguishing concentration for Class B n-heptane fire and Class A wood crib surface fire Annex D (Normative) Test procedures and sample quantity for the system Annex E (Normative) Test procedures and sample quantity for the fire extinguishing agent cylinder set Annex F (Normative) Test procedures and sample quantity for the expellant gas cylinder set Annex G (Normative) Test procedures and sample quantity for vessel Annex H (Normative) Test procedures and sample quantity for vessel valve Annex I (Normative) Test procedures and sample quantity for nozzle Annex J (Normative) Test procedures and sample quantity for selector valve Annex K (Normative) Test procedures and sample quantity for check valve Annex L (Normative) Test procedures and sample quantity for header pipe Annex M (Normative) Test procedures and sample quantity for connecting pipe Annex N (Normative) Test procedures and sample quantity for safety relief device Annex P (Normative) Test procedures and sample quantity for drive device Annex Q (Normative) Test procedures and sample quantity for control panel Annex R (Normative) Test procedures and sample quantity for weighing device Annex S (Normative) Test procedures and sample quantity for pressure indicator Annex T (Normative) Test procedures and sample quantity for liquid level measuring device Annex U (Normative) Test procedures and sample quantity for signal feedback device Annex V (Normative) Test procedures and sample quantity for pipelines and pipe fittings Annex W (Normative) Test procedures and sample quantity for hook and bracket Annex Y (Normative) Test procedures and sample quantity for pressure reducing device Annex Z (Normative) Test procedures and sample quantity for low venting high close valve