Valley R Center-SP 891002The City With A Beautiful Future
P.O. Box 478
Coppell, Texas 75019
214-462-0022
October 2, 1989
Mr. Earl Cotton
P. O. Box 1226
Rowlett, Texas
75088
Review and Approv~y~al of the Febco 806 DDC for Fire Line
Application in,ali~ Ranch Ce__r~
Dear Mr. Cotton:
Per your request, I have reviewed the attached information and find
this product to be acceptable for an alternate to the Hersey DDC
II. Please remember that the valves installed with this device
shall be resilient seat O S & Y gate valves.
Additionally, in order to gain approval for the use of this type
of fire line meter setting, the fire system shall be of the closed
interior sprinkler system type with alarm system connected to the
City of Coppell's Fire Department communications system and all
exterior on site fire hydrants shall be equipped with hydra storz
valves located on the 4 1/2" pumper nozzle.
If you have any questions regarding this matter, please contact me
at 462-8495.
Sincerely, j /~// ~
' ~{oward L. Paffor~/
Utilities Superintendent
HLP/bb
xc =
Steve Goram, Director of Public Works
Larry Davis, Public Works Inspector
James Rainey, Interim Fire Marshal
Attachment
FEBCO806.HLP
0,.., ~. ,/,:,~ :~5:25 TR~qNS TEX SUPPLY CO RtCH,qR~SON
SPECIFICATION SHEET NO. 806 DDC (4" - 10"i
Model 806 DDC
(4" through 10")
Double Detector Check
Valve Assembly
For Fire Protection Service
Features
· Prevents contamination of potable water by bacMIow from
the t~re protection system and detects leaks or
unauthorized water use at all flow rates.
'~ Meets all specifications of USC Foundation for Cros~
Connection Control and Hydraulic Research,
· Docun'~ented flow Curves e~.tablish~d by University of
Southern California Foundation for Cross Connection
Control and Hydraulic Research,
· Simple service procedures, All internal pans serviceable
in line.
· Mainline unit has two independent spring loaded "Y" type
check valves.
· · By.pass line has water meter in series with an approved
double check valve.
· Corrosion resistant internal parts.
Specifications
The mainline unit shall consist of two internally spring loaded
"Y" figure check valves having cast Iron booles, bronze
replaceable seat rings and 300 series stainless steel stems
and springs. The stems shall be guided with replaceable
bushings in the cover and seat ring to assure positive check
seating. Alt internal cast iron parts shall be epoxy coated.
The by-pass tine assembly shall consist of ~ bronze body
internally spring loaded double check verve ill se:ids with
a bronze water meter.
All check valve internal parts shall be easily accessible
without removing the check valve body from tho line, Rated
to 175 PSI working pressure and water temperatures from
32°F to 140"F.
TI'lb duvice shall H ~eut ti ~u requiremu~tt'4 of USC Foundation
for Cross Connection Control and Hydraulic Research, Sixth
Editior~,
Description
The Febco 806 DDC Device mainline unit consists of two
~ Independent, spring loaded, "Y" type check valves, two
shut-off valves and four testcocks. The spring loaded
poppets in ooniunction with serf elastomer discs provide
drip bght closure against backtlow. The 'Y" p~ttarn valve
design p~uvides Iow p~e~su~e Io~ at the higtl flow rates.
The shut-of/valves are OS&Y type, UL listed for fireline
Tr~e by-pass line assembly Consists of a water meter in
sends with a double check valve. The meter is the total type
with accurate registration between 1 and 20 gpm flow rates,
The double check consists of two independently acting,
spnng leaded, poppet Iype check valves· rhe static
pressure drop across both checks is approximately 2 PSI
less than the mainline check valves.
All flow up to approximately ten (10) gpm is through the
by-pass line, Above this flow rate the mainline check valves
begin to open and flow occurs through the mainline and
the by-pass line. This operation at Iow flow rates is
accomplished by designing the differential pressure drop
across the by-pass double check valve to be slightly less
than the mainline double check vane, Therefore, the main-
line check valve remains closed so that any flow through
the flreline system is registered by the by-pass meter·
Materials
Mainline units have cast iron bodies with internal epoxy
coating and bronze trim. a/,," by-pass units have bronze
bodies with bronze trim,
Nitdle seat discs, Gate valves supplied on the mainline are
OS&Y, The by-pass gate valves are non-rising stem.
Typical Applications
Fire scrv~cc pipelines
Installation
Double Detector Check Valve Backflow Prevenlers should
be installed with minimum clearance Of 12" between device
.... Fire '
~nd fleet or grade, They. should be inst,-...¢d where easily
accessible fo,- ~es.$ting and maintenance and must be
protected from freezing. They should have support blocks
to prevent flange damage, Thermal water expansion and/or
water hammer downstream of the 8ackflow Preventer can
cause excessive pressure. Excessive pressure situations
should be eliminated to avoid possible damage to the
system and device.
Characteristics
Temperature range
Approvals
USC FCCC & HR,
UL 897U
FM
175 PSi
350
32"F to MO'dr (0"C ~o 60"C)
TRAI.IS TEX SUPPLY C0 RICHARDSON 982
Dimensions and Weights (U.S.-Inches)
~ET
S,IZE A 8 C D P~ wi .(Lt~s,) WT,(Lg,)
4 50~A6 32~A. 23a/, 11 15 499 224
R 59'V.~ 38r%~ 32% 14 16 812 457
ii 69~/,,~ 46V,~ 41% 18 17 1307 627
10 84%. 58'/,~ 50'~ 22 2o 1767 1107
(Metric-mm)
NET NET
SIZE A B C D E WT.(K~s.) VVI'.(Lg.).
10(.1 1281 1 820.7 603.3 279.4 381.0 226.3 101,6
150 1516.1 979,5 828.7 355.6 406,4 368.3 207'.3
200 1757.4 1170.0 1063.6 457,2 431.8 592.9 288.9
250 2138,4 1474,81282.7 558,8 5080 801.5 502,1
Model 806 DDC Flow Curves
(r-low curves as establi~Jhed by Factory Mulual)
.-:.:::, . :-:.. : : :: : :..., ....
250 5~ 750 1~0 ~GPM)
5 7.5 10 t5 20 2b (FPS)
'1
300 600 ~0 ~2o0 1500 ~8~ (GPM)
~ 7~ 10 15 20 (FPS)
10 : -' ' ~. I
5 ~ ' ' "( + '" ~'
........ ' ..... ~' ": ~" I
400 800 1200 I~ 2~ 2400
1 ¢~ 5 (FPS)
S 7.5 lo 15 (FPS)
A division of CMB Industries P.O.Bux 8070, Fresno, California 93747, (209) 252-0791 Telex: 33-7816 CMB FSO
SS 806 DDC OATI~ 9?80 All matenma ¢opyr~hl~O. Piir~ad In USA