The number one cause for a sprinkler system failure is a closed control valve.
Let’s add more control valves 🥹. Makes no sense to me to add additional control valves.
Thanks,
John
John August Denhardt, P.E
Vice President Engineering and Technical Services
American Fire Sprinkler Association
301-343-1457
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On Oct 20, 2025, at 11:36, Parsley Consulting <[email protected]> wrote:
Tim,
Understood, however that prompts my question.
Why do you need a PIV? Doesn't the backflow serve as a control
valve?
It's already difficult enough by having two control valves on a
system, on opposite ends of the backflow, why do you need to add a
third control valve (PIV)?
Doesn't that increase the opportunity for the system to be out of
service, particularly if the monitoring (tamper switches, locks,
etc) were compromised?
sincerely,
Ken Wagoner, SET Parsley Consulting
3002 Younger Drive
Harrisonville, Missouri 64701-3909 Phone: (760) 745-6181 Visit
the website
On 10/20/2025 11:45 AM, Tim Easter
wrote:
Currently only piv. Want to remove piv and just
install main control valve at riser. Piv didn't close all the
way. Been underground a long time.
On Mon, Oct 20, 2025, 12:36 PM
Parsley Consulting <[email protected]>
wrote:
Tim,
I won't copy what Craig and Tom have said, only to offer
my own thoughts.
If the backflow serves only one sprinkler system, the
OS&Y valves there function as a system control valve.
Indeed §16.9.3.3.5 in the '22 and '25 editions of -13
specifically permits them to serve as a control valve to a
sprinkler system provided they are listed for fire
protection. And the supervision requirements of §16.9.3.3
would apply as well.
Why are you adding a PIV, and installing a control valve
at risers? Is there more than one system?
We are trying to remove PIVs, and install a main
control valves at risers. AHJ is saying we must have a
PIV. Also, we have BFPs before the PIVs. Can anyone help
me find in NFPA 13 or 24 the section about PIVs?
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