I don't know of a requirement for flanged fittings in the suction side. OS&Y valves typically came FxF and hence the suction side fittings would all be flanged. Grooved OS&Y is becoming more popular... That being said, I have yet to see a pump with grooved inlets and outlets.
Pros to all grooved are they are quicker to install. Pros to all flanged is they create a more stable/sturdy connection. Taylor Schumacher Security Fire Sprinkler<http://www.j-berd.com/> 1 Industrial Blvd | Sauk Rapids, MN 56379 Office: 320.656.0847 | Direct: 320.640.7050 From: Brian Harris <[email protected]> Sent: Tuesday, September 12, 2023 7:48 AM To: [email protected] Subject: [Sprinklerforum] Pump Suction Components Caution: This email originated from outside your organization. Please take care when clicking links or opening attachments. I've seen two schools of thought with regard to pump suction components. One way is flanged on the suction side and grooved on the discharge. The other is all grooved. I can; t see where NFPA-20 requires it either way. What's the popular choice and are there pro's & cons? Brian Harris, CET BVS Systems Inc. bvssystemsinc.com<http://bvssystemsinc.com/> Phone: 704.896.9989 Fax: 704.896.1935
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