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deluge system

Question asked by HAFEEZ OSMAN on Feb 19, 2018
Latest reply on Mar 18, 2018 by HAFEEZ OSMAN

NFPA15 - version 2017

A.7.6.1 Examples of combined systems include the following:
(1) Open-nozzle water spray protection for a vessel combined
with area protection provided by a deluge system


if water spray fixed system include deluge system why in above paragraph NFPA15 separate between them?