IS 15506 : 2004 Gaseous Fire Extinguishing Systems - IG 55 Extinguishing Systems

1 Scope

1.1 This standard sets out specific requirements for the designand installation of total flooding fire extinguishing systemsemploying IG 55 gas extinguishant. This standard is applicable tosingle supply as well as distributed supply systems.

1.2 This standard complements various general requirementsapplicable to all types of gaseous fire extinguishing systems(Halocarbon as well as Inert gas systems) listed in IS 15493. Assuch, both these standards should be read together before designinga system. Where requirements in both the standards differ, thisstandard shall take precedence.

1.3 Before using IG 55, nature of fire and fire spread shall bestudied for suitability of extinguishment as high discharge time of60 s may not be suitable for rapid spreading fires.

1.4 This standard covers systems operating at normal pressure of15 MPa at 21�C and 20 MPa at 21�Conly.

2 References

IS 7285 : 1988 Specification for seamless steel cylinders for permanent and high pressure liquefiable gases

IS 15493 : 2004 Gaseous fire extinguishing systems - General requirements