AL-ASWAD Fire Protection Systems Co.
ﺷﺭﻛﺔ ﺍﻷﺳــﻭﺩ ﻷﻧﻅﻣــﺔ ﻣﻛﺎﻓﺣﺔ ﺍﻟﺣـــﺭﻳﻖ
C.R: 2050105741 2050105741 : ت. س
Main C.R: 2050005395 2050005395 :ت رﺋﻴﺴﻲ. س
Owner: Hazem Fayez Al Aswad ﺣـ ـ ـﺎزم ﻓـ ـﺎﺋـ ـﺰ اﻷﺳـﻮد: ﻟﺼﺎﺣﺒﻬﺎ
E-mail: aswadfpd@aswadgroup.com aswadfpd@aswadgroup.com : ﺑﺮﻳﺪ اﻟﻜﱰوﱐ
03/09/2024
Project: Maersk Logistics Park - Jeddah
Contractor: Zamil Steel Construction Co. Ltd.
Subject: Calculation/Estimation of Preaction system Air Compressor Capacity
8.2.6.3.1 The compressed air supply shall be from a source available at all times. NFPA 13 Edition
2019
8.2.6.3.2* The air supply shall have a capacity capable of restoring normal air pressure in the system
within 30 minutes. NFPA 13 Edition 2019
A.8.2.6.3.2 When a single compressor serves multiple dry pipe systems, the 30‐minute fill time is
based on the single largest system. NFPA 13 Edition 2019
The compressor size should be sized and selected to fill the system piping internal volume to a
pressure of 40 psi in a duration of 30 minutes.
There is basically one major method to size the air compressor as detailed below:
The required flow rate of the air compressor (Cubic feet per minute CFM) can be found from the
following equation:
𝑉 𝑃 .
𝑄
𝑃 𝑡 7.48 𝐺𝑎𝑙𝑙𝑜𝑛⁄𝑓
Where: 𝑉 : Volume of the system calculated from table below.
𝑃 .: Required pressure for the system (NFPA 13 requires 40 psi)
𝑃 : Atmospheric pressure measured as 14.7 psi
𝑡 : Filling time of the system measured in minutes (NFPA 13 requires 30 Minutes)
7.48 : Conversion factor with units of Gallon/Cubic feet
𝑄 : Volume flow rate measured in (CFM)
Head office: P.O 2457 Dammam 31451 Saudi Arabia اﳌﻤﻠﻜﺔ اﻟﻌﺮﺑﻴﺔ اﻟﺴﻌﻮدﻳﺔ31451 اﻟﺪﻣﺎم2457 ب. ص: اﳌﻜﺘﺐ اﻟﺮﺋﻴﺴﻲ
Tel.: 013-805-5050 / Fax: 013-805-6407 013-805-6407 : ﻓﺎﻛﺲ013-805-5050 :ﻫﺎﺗﻒ
AL-ASWAD Fire Protection Systems Co. ﺷﺭﻛﺔ ﺍﻷﺳــﻭﺩ ﻷﻧﻅﻣــﺔ ﻣﻛﺎﻓﺣﺔ ﺍﻟﺣـــﺭﻳﻖ
C.R: 2050105741 2050105741 : ت. س
Main C.R: 2050005395 2050005395 :ت رﺋﻴﺴﻲ. س
Owner: Hazem Fayez Al Aswad ﺣـ ـ ـﺎزم ﻓـ ـﺎﺋـ ـﺰ اﻷﺳـﻮد: ﻟﺼﺎﺣﺒﻬﺎ
E-mail: aswadfpd@aswadgroup.com aswadfpd@aswadgroup.com : ﺑﺮﻳﺪ اﻟﻜﱰوﱐ
The below table of total volume is as per designed and installed networks.
Calculated volume flow rate (CFM) based on PAV total volume
(PAV total volume) 𝑔𝑎𝑙𝑙𝑜𝑛 40 𝑙𝑏⁄𝑖𝑛
𝑄
14.70 𝑙𝑏⁄𝑖𝑛 30 𝑚𝑖𝑛 7.48 𝐺𝑎𝑙𝑙𝑜𝑛⁄𝑓
Head office: P.O 2457 Dammam 31451 Saudi Arabia اﳌﻤﻠﻜﺔ اﻟﻌﺮﺑﻴﺔ اﻟﺴﻌﻮدﻳﺔ31451 اﻟﺪﻣﺎم2457 ب. ص: اﳌﻜﺘﺐ اﻟﺮﺋﻴﺴﻲ
Tel.: 013-805-5050 / Fax: 013-805-6407 013-805-6407 : ﻓﺎﻛﺲ013-805-5050 :ﻫﺎﺗﻒ
AL-ASWAD Fire Protection Systems Co. ﺷﺭﻛﺔ ﺍﻷﺳــﻭﺩ ﻷﻧﻅﻣــﺔ ﻣﻛﺎﻓﺣﺔ ﺍﻟﺣـــﺭﻳﻖ
C.R: 2050105741 2050105741 : ت. س
Main C.R: 2050005395 2050005395 :ت رﺋﻴﺴﻲ. س
Owner: Hazem Fayez Al Aswad ﺣـ ـ ـﺎزم ﻓـ ـﺎﺋـ ـﺰ اﻷﺳـﻮد: ﻟﺼﺎﺣﺒﻬﺎ
E-mail: aswadfpd@aswadgroup.com aswadfpd@aswadgroup.com : ﺑﺮﻳﺪ اﻟﻜﱰوﱐ
Based on the proposed air compressors, the largest capacity is 500L (132.1 Gal) with 33.60 CFM
Total Required Volume Flow Rate (CFM)
Total Air Compressors =
Proposed Air Compressor Volume Flow Rate (CFM)
Al Aswad Fire Protection Systems Co.
(Certified Distributor of The Viking Group Inc. in KSA)
Head office: P.O 2457 Dammam 31451 Saudi Arabia اﳌﻤﻠﻜﺔ اﻟﻌﺮﺑﻴﺔ اﻟﺴﻌﻮدﻳﺔ31451 اﻟﺪﻣﺎم2457 ب. ص: اﳌﻜﺘﺐ اﻟﺮﺋﻴﺴﻲ
Tel.: 013-805-5050 / Fax: 013-805-6407 013-805-6407 : ﻓﺎﻛﺲ013-805-5050 :ﻫﺎﺗﻒ
