Valley R Center-CS 891002 Coppell, Texas 75019
The City With A Beautiful Future 214-462-0022
Mr. Earl Cotton
P. O. Box 1226
Rowlett, Texas 75088
RE: Review and Approval of the Febco 806 DDC for Fire Line
Application in Valley Ranch Center
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 0 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, 1
oward L. Pafforq~'/
Utilities Superintendent
HLP/bb
xc: Steve Goram, Director of Public Works
Larry Davis, Public Works Inspector
James Rainey, Interim Fire Marshal
Attachment
FEBCOS06.HLP
08/17/89
13:25
Model 806 DDC
(4" through 10")
double Detector Check
Valve Assembly
For Fire Protection Service
TRANS TEX SUPPLY CO RICHARDSON
SPECIFICATION SHEET NO. 806 DDC (4"-
.,)
Features
· Prevents contamination of potable water by backIIow from
lhe ftre 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.
· Documented flow curv~ e~tablished by University of
Southern C&lifornia 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.
· 8y,p[tss line has water meter in series with an approved
double check valve.
· Corrosion resistant internal paris.
Specifications
The mainline unit shall consist of two internally spring loaded
"Y' figure check valves having cast Iron bodies, bronze
replaceable seat rings and 300 series stainless steel si,ems
and springs. The stems shall be guided with replaceable
bushings in the cover and seat ring to assure positive check
seal~ng. All internal cast iron parts shall be epoxy coated.
The by-pass line assembly shall consis[ of 'a bronze body
internally spring Io~ded double check valve in series with
a bronze water meter,
All check valve internal paris shall be easily accessible
wi[hOur removing [he cl~eck valve body from tho line, Rated
to 175 PSI working pressure and water temperatures from
32'F to 140"F.
The d~vice shall ~ ~ee[ tl~ r~quir~rn~nt~ ur USC Foundation
for Cross Connection Control and Hydraulic Research, Sixth
Edition,
Description
The Febco 806 DDC Device mainline unit consists of two
.)independent, spdng loaded, "Y" type check valves, two
. shut-off valves and four testcocks. The spring loaded
poppets in coniunction with soft elastomer discs provide
drip tight closure acjainst ba~:kfiuw. Th~ 'Y" ~ttt~rn valve
desigq provides Iow pressure I~ss al, the high flow rates.
The shut-of/valves are OS&Y type, UL listed for fireline
The by-pass line assembly Consists of a water meter in
series 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,
spring loaded, poppet [ypu check valves. The 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
tl~e Dy-pass line. This operation at Iow flow rates is
accomplished by designing the differential pressure drop
across the by-pas~ double check valve to be slightly less
Ihan the mainline double check valve. 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 bodie~ with internal epoxy
coating and bronze trim. ~/~" by-pass units have bronze
bodies with bronze trim.
Nitrile seat discs. Gate valves supplied on the mainline are
OS&Y, The by-pass gate valves are non-rising stem.
Typical Applications
Fire scrvicc pipelines
Installation
Double Detector Check Valve Backflow Preventers should
be installed with minimum clearance of 12" between device
Protective
Enclosure
and floor o~ grade. They should be installed where easily
accessible for lasting and maintenance and must be
protected from freezing. They should have support blocks
tO prevent flange damage. Thermal water expansion end/or
water hammer clownstream of thu Buckllow Preventer can
cause excessive pressure. Excessive pressure situations
should be eliminated {o avoi0 possibte damage to the
system and device.
Characteristics
Maximum wot~ing preSSure
Temperature r encje
Main valve bc:~y
Trim
By-pea. valve
By-pace
Mamllnc ,shutoff valves
I::lastomers
Mainline; 4'. §', a", & 10"
By-pass:
175 PSi
350 PSI
32°F to 140<'F (0"C I0 GO"C)
Water
r'langed ANG113
G~ay iron ASTM A- 126
epoxy coalreO intet,'~al
Bronze ASTM D-61
Bronze ASTM
Turbine drwe, 1 Io 20gpm
Size %' x ¥, ·
Bronze ASTM B584-78
OS&Y, UL./FM
Nimte A3TM D-2000
Rumolu tuudi~sg IIL~w meier available.
Approvals
USC FCCC & HR,
UL 897U
FM
A division of CMB Industries P.O.Bux ~070,
SS 806 DDC o^1'1~ 9~0e
TR~NS TEX SUPPLY CO R ICHRRDSON
Dimensions and Weights
SIZE A 19 C O
E~02
(U.S.-Inches)
NET NE'I
wl.(L~s.) WT,(Lg.)
4 50%~ 32~A. 233,/, 11
R 5g~¼e 389, s 32% 14
fl 693/,. 46V,~ 41% 18
10 84%~ 58V~ 50'~ 22
15 4~g 224
16 812 4~7
17 1307 637
20 1767 1107
SIZE A B
(Metric:mm)
NFT NET
C O E w'r'. (K~s.) WT.(Lg.)
~00 ~Z81 ~ 820.7 603.3 279.4 381.0 226.3 103,6
150 1516.1 979,5 828.7 355.6 406,4 368.3 207.3
200 1757.4 1170,0 10§3.6 457,2 431.8 592.9 288.9
230 2138,4 1474,8 1282,7 558,8 5080 801.5 502,1
Model 806 DDC Flow Curves
(Flow curves as established by Factory Mulual)
0 250 500 7'50 1000 (GPM)
5 7.5 10 ~5 20 2.b (FP6)
}~ ........ ;., ~,. m.,., ,, . . ~-- ,, , , .... , . .
' ~J . ~.. , . ; . .. .:. :, ; ...~ .......... ; .~ .... ~,.r....:]
J ~.:!;~ ....................... ...-.j
i
]: O ,; " ' ......... ',, ' 't ..... ~ ....... ,;, J
0 30o 600 900 ~2o0 1500 ~ 800 (GPM)
5 ?,~ 10 ~§ ~'0 (FPS)
I
., , . ~ ....... , .... ............... ~ ~ ....... ...........
0----: ..... ._' ' ",;, ,;" :;" ' + ...... ;,:.;', ..... "'*' ,~'' 'i
0 4~X~ 800 1200 ~00 2000 24UU [GPM)
5 7.5 10 1,5 (FPS)
10" ,
::E
5
~000 200() 3000 ,IO00 [GPMI
5 7.5 10. 15 (FPS)
NOTE3. FLOW RATE (GPM and FPS)
1. Velocities a~e calculated lu~ [lows In Schedule 40 steel pipe.
~. Flow curve3 lot 3" device available UDOn reQgest.
Fresno, California 93747, (209) 252-0791 Telex: 33-7616 CMB FSO
Ail matenaJa copyng~te0. Prirded In USA