I never had this problem before, but it looks like a Deringer 20 backflow
has lower opening pressures. You may also consider something like several
smaller Watts 2000B-FP in parallel, depending on the flows you need.
I don't think piping the jockey differently would help, but let me know if
you g
What is your site elevation AMSL? Have you tried to operate the pump yet?
While we typically don't run pumps below 0 psi, it can be done by figuring
in by also accounting for air pressure. While not recommended, as long as
you are not cavitating the impeller, the system should work.
I had a simil
“Not any back flow” is being too loose with terms. Temperature differences
alone will circulate water with the tank. Basically you have a fire pump in the
domestic water system. All the piping materials and components in the system
and connected to the system up to and including the double check
Does the water tank also provide water to potable systems or is it just
dedicated to the fire sprinkler systems?
This is the one reason why BFPs are not installed on the suction side of pumps.
If it's required, take it out and put it on the discharge side. The question
does come to mind in ho
I agree with the backflows being on the discharge side of the pumps. If you
only have 7 PSI flooded suction, there is not going to be any backflow out of
the FP System thru the Pump back to the tank anyway. Figure the extra loss in
your calculations. I have done this before with shared water sup
Yes, we have pottable water being taken from the same tanks. This is a
rural high school and this is their own water system that feeds the school.
So I need the backflow for that reason.
Best regards,
*Joe Burtell, SET, CFPS*
[image: Burtell Fire_Small]
Phone | Fax | Mobile| Text *406-204-4653
Hi Joe,
Why would you need the BFP if you have storage tanks? Are there other systems
being fed from the same tanks that would necessitate the BFP?
Cliff Whitfield, SET
President
Fire Design, Inc.
940 Summerbrooke Drive
Tallahassee, FL 32312
Ph: 828-284-4772
cl...@fire-design.com
www.fire-
Why is the backflow in that particular spot? Are the tanks connected to
potable as well? If so you might still be able to get dispensation to put the
backflow after the pump if feasible, it's not like anyone's going to
accidentally create a backflow condition when there's no outlets with which
I have a situation with a verticle in-line fire pump fed from water
storage tanks. We have a double check backflow installed between the tanks
and the fire pump but we don't have enough pressure to open the backflow on
the upstream side between the tank and backflow. I talked with Watts about
it. T
