High Expansion Foam Generators are equipped with fans. Typical usage is aircraft hangars or warehouses. Foam Chambers commonly are triangular in shape or cans approximately 1-2 gallons in capacity, typically mounted on flammable liquids storage tanks. Bladder tanks do not utilize foam pumps. The pump you described sounds like a fire pump (NFPA-20). Foam pumps take suction from an atmospheric foam concentrate tanks.
Thank you, Jackie “JW” Ward 1-405-240-7076 From: Tim Easter <[email protected]> Sent: Thursday, February 20, 2025 6:59 AM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]> Subject: [Sprinklerforum] NFPA 11 and 25 Are high expansion foam generators considered fixed foam devices? We are using fire pumps to pressurize the bladder tank, thru proportioner attached to riser. Are these pumps considered water-powered foam concentrate pumps? How do I know if Are high expansion foam generators considered fixed foam devices? We are using fire pumps to pressurize the bladder tank, thru proportioner attached to riser. Are these pumps considered water-powered foam concentrate pumps? How do I know if I have a foam chamber, a diaphragm balancing valve, a vacuum vent, or a rupture disk? How do I know if the foam concentrate tank, which is a bladder tank, has an expansion dome? Is HEF generator considered a foam maker? Thanks.
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