Any ideas why upright sprinkler are used in basement, car park?
More information would be needed to answer your question. What is the challenge that you see in the use of upright sprinklers in this occupancy? Research has shown that sprinklers should direct the flow of water downward onto the burning combustibles. The only exception that I can recall off hand is for sprinklers installed under combustible pier decks were pendent sprinklers are installed upright in order to protect the pier from fires in burning liquids flowing across the surface of the water beneath and thus continuously re-exposing the pier's combustible construction.
Is the ceiling combustible? If so it is in violation of other provisions of the National Fire Codes but if you are trying to address an existing situation you should lay out more details about the occupancy as found.
It’s only flat cement ceiling
Just installer preference, no standard requirement.
Upright or pendent, both can be installed and will have the same efficiency, as long as they are installed in the correct position.
Pendent might be more susceptible to mechanical damages in a car park.
Upright heads would be used if the system is a dry pipe system. Refer to NFPA 13 Chapter 7, 7.2.2 (2013).
if its a flat cement ceiling uprights will give the best coverage and least potential for damage
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