Todd,
According to NFPA 20, 2013 ed., 4.26, Table 4.26 shows 4” minimum suction.
2022 ED. Is the same.
Regards,
G. Tim Stone
G. Tim Stone Consulting, LLC
NICET Level III Engineering Technician
Fire Protection Sprinkler Design
and Consulting Services
117 Old Stage Rd. - Essex Jct., VT. 05452
CELL: (802) 373-0638
[email protected] <mailto:[email protected]>
From: Fpdcdesign <[email protected]>
Sent: Saturday, October 7, 2023 10:16 AM
To: Discussion list on issues relating to automatic fire sprinklers
<[email protected]>
Subject: [Sprinklerforum] Distance to fire pump suction
I have a system with a 6” backflow preventer, which reduces to 4” immediately
after. There is approximately 48” of 4” pipe to the suction flange on a 4 x 3
pump. All elbows are turning correctly. Is this sufficient? Does the 10x rule
apply to the size of the backflow preventer or the fitting directly attaching
to the pump?
Todd G Williams, PE
Fire Protection Design/Consulting
Stonington, CT
860-535-2080 <tel:860-535-2080> (ofc)
860-554-7054 <tel:860-554-7054> (fax)
860-608-4559 <tel:860-608-4559> (cell)
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