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maximum vertical distance for in-rack sprinklers

Question asked by tine.dolinsek on Feb 21, 2018
Latest reply on Feb 24, 2018 by tine.dolinsek

Our design is dealing with sprinkler protection for rack storage of cartoned group A plastics. Due to a height of over 25 ft (7,6m) the arrangement drawn in Figure (b) has been chosen for single and double row racks. What is the maximum  vertical distance between in-rack sprinklers for this arrangement? My question is: Is it 10ft (3,0m) as it is defined in note nr.6?

Furthermore, in Chapter 16,  and in other case, Figure (A) (i), has been chosen. There is also a note nr.6 which defines the maximum vertical distance of in-rack sprinklers to 10ft (3,0m), but table says vertical spacing is 20ft (6,1m).

Could you correct my understanding for both cases, please? Thank you in advance.