Where is the safest, smartest, and most cost effective location to install a containment backflow preventer? If you think it's in a vault or inside a building you may need to think again. Learn about the advantages and disadvantages to each option in this guide on backflow installation.
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Waterworks Best Practices: Containment Backflow Preventer Design & Placement
1. …poorly understood
by designers
Best Practices: Containment Backflow Preventer Placement
Best Practices:
Containment Backflow Preventer
Design & Placement
2. Best Practices: Containment Backflow Preventer Placement
“…. The return of any water to the public
water system after the water has been
used for any purpose on the customer’s
premises or within the customer’s piping
system is unacceptable and opposed by
AWWA. …”
3. Bottom Line for
the future:
Best Practices: Containment Backflow Preventer Placement
More Containment
More RPZs
More Outdoor
Aboveground Installations
4. Why place a BFP outside?
Best Practices: Containment Backflow Preventer Placement
1. RPZs are an indoor flood hazard
5. “Before an RPZ is located, consideration should be
given to both how much water will be discharged,
and where it will drain. Consideration must be
given to the drain system to assure the drainage
system can handle the load. If a drain is not
capable of accepting the flow, other choices as to
the location of the valve, such as outside in a
heated enclosure, should be made.”
-2006 ASPE Plumbing
Engineering Design Handbook, vol 2, p 70
Best Practices: Containment Backflow Preventer Placement
Why outside?
6. Why outside?
Inside a building can be a major liability.
Best Practices: Containment Backflow Preventer Placement
7. Where to place a BFP?
Best Practices: Containment Backflow Preventer Placement
9. 2. Revenue & prop
value: Indoor RPZs
Reduce the rentable
square footage of a
building reducing
revenue & property
value
Why outside?
Best Practices: Containment Backflow Preventer Placement
10. Charlotte,
NC: 32 SF
Columbus,
OH: 36 SF
Suffolk Cty,
NY: 33.3 SF
Arlington,
TX: 32 SF
How much space is lost?
Average: 33.325 SF
Annual Rent Value: $999.75
(based on Class A Office @ $30 psf)
25-year Cash Flows: $34,149.22
(based on 2.5% inflation)
Net Present Value: $12,156.48
(based on 9% discount rate)
Best Practices: Containment Backflow Preventer Placement
11. Net Present Value - $12,156.48
“If you pay me this today, I am indifferent to the loss
of those income streams over the next 25 years”
QUESTION:
Will placing the system inside save
$12,156.48 over any other method?
… it depends on how much it costs to put it outside.
What’s that space worth?
Best Practices: Containment Backflow Preventer Placement
12. Aboveground heated enclosure for 3” BPA with heat.
$1,000
$1,120
$1,800
$3,920
$3,266
$1,200
$1,800
$6,266
Best Practices: Containment Backflow Preventer Placement
Option A:
Use conventional model
Watts 957 NRS
Option B:
Use new ”n-type” model
Watts 957N NRS
14. 3. Fire safety:
Indoor water
resources for fires
unnecessarily add
risk to firefighters
Why outside?
Best Practices: Containment Backflow Preventer Placement
15. 1. RPZs are not
allowed to be
installed in
Vaults
Why not a vault?
Best Practices: Containment Backflow Preventer Placement
16. 2. ConfinedSpaceHazards:
Vaults are dangerous
and expensive to
maintain and repair.
New OSHA Guidelines, May 4, 2015:
Google: Pre/Post-Entry Information Exchange Duties of Host Employers and Controlling Contractors
Why not a vault?
Best Practices: Containment Backflow Preventer Placement
17. Best Practices: Containment Backflow Preventer Placement
Why not a vault?
3. Flooded vaults violate the International Plumbing Code.
608.1 General.
A potable water supply system shall be
designed, installed, and maintained in such a
manner so as to prevent contamination from
nonpotable liquids, solids or gases being
introduced into the potable water system
through cross connections or any piping
connections to the system.
- International Plumbing Code 2013
18. 4. Aboveground fire BPA
enclosures with FDCs
are safest, most
efficient solution for
firefighters
Why not a vault?
Best Practices: Containment Backflow Preventer Placement
19. 5. Retrofits:
Water use hazard
changes over time –
whether by changing
tenant or changing
guidelines – force
enclosure retrofits and
leave vaults empty
Why not a vault?
Best Practices: Containment Backflow Preventer Placement
20. - Plumbing Standards Magazine, Fall 2009
“An outdoor, aboveground BFP installation may be the
best way to
1) reduce the owner’s exposure to damage caused by
flooding....and the corresponding water contamination
caused by a cross-connection; and
2) reduce the legal liability of the design engineers, the
installers, and the certified testers whose professional
actions, in part, may have otherwise caused the flooding
harm.
The water industry has a nationally accepted design
criteria in ASSE’s Standard-1060 to protect these
installations. It’s a win-win-win ‘insurance policy’.”Douglas Cregor, Esq.
Best Practices: Containment Backflow Preventer Placement
Why an Enclosure?
6. Insurance Policy
31. Fort Worth, TX
Alpine
Bedford
Boerne
Carrollton
Cleburne
College Station
Denison
Farmington
Farris
Franklin
Grand Prairie
Haltom
Texarkana
Waco
Waskom
White Settlement
Addison
Arlington
Buda
Cedar Hill
Colleyville
Crowley
Denton
Duncanville
Fort Worth
Franklin
Gainesville
Highland Village
Midlothian
Roanoke
Round Rock
Saginaw
Same language added to muni code in past 5 years
Best Practices: Containment Backflow Preventer Placement
34. Denver did
Best Practices: Containment Backflow Preventer Placement
What Can Cities/Counties Do?
1. Adopt standard details consistent with best practices
36. Charlotte did
Best Practices: Containment Backflow Preventer Placement
What Can Cities/Counties Do?
1. Adopt standard details consistent with best practices
37. Las Vegas did too
Best Practices: Containment Backflow Preventer Placement
38. Best Practices: Containment Backflow Preventer Placement
Tell DFW to Follow their Lead
The city of Arlington did in February 2016