GB/T 244802009 National Standard of the People's Republic of China GB/T 24480-2009 Landing doors fire resistance test- Methods for leakage rate, thermal insulation and radiation Issued onOctober15,2009 Implementedon March 1,2010 Issued by StateAdministration for Quality Supervision and Inspection and Quarantine of the People's Republic of China &China Standardization Administration of the People's Republic of China GB/T24480-2009 Contents Foreword. Introduction. 1 Scope. 2 Normative references. 3 Terms and definitions 4 Test principle.. 5 Test equipment. 6Test conditions... 7 Landing doorspecimen.. 8 Supporting construction. 9 Humidity conditions.. 10 Pretest examination. 人 11Test instrumentationand dataacquisition 12Testprocedure 13Test termination. 14Assessment of fire resistanceperformance .9 15 Criteria of fire resistance performance.. .10 16 Direct field of application.. 17Classificationprocedureanddeclarationoffireresistanceperformance.. .10 18 Test report... Annex A (Normative) Description of the canopy and measuring system for gas leakage rate. 12 Annex B (Normative) Standard supporting construction. 14 AnnexC (Normative) Verificationprocedureforgas leakageratemeasurement... 15 AnnexD (Normative) Calculationof leakagerate.. Bibliography... .18